Baby carriage small in size after being folded

Abstract

The baby carriage comprises a front leg assembly, a rear leg assembly and a push rod, the front leg assembly comprises two front legs and two front wheels which are in bilateral symmetry, the rear leg assembly comprises two rear legs and two rear wheels which are in bilateral symmetry, and the upper portions of the rear legs are rotationally connected with the upper portions of the front legs; the lower part of the push rod is also rotationally connected with the upper part of the front leg; the upper portions of the two front legs or the lower portions of the push rods are provided with rotating shafts, the upper portions of the two rear legs are provided with shaft holes matched with the corresponding rotating shafts in a rotating mode, and the vertical line B of the projection of the axis A of each rotating shaft on the horizontal plane is in an inclined shape gradually approaching the middle from back to front. And linkage folding structures capable of driving the two rear legs to fold forwards and draw close to the middle when the push rod is folded downwards are arranged between the push rod and the left and right rear legs. The folding chair has the advantage of being small in size after being folded.

Description

Technical Field

[0001] The present invention relates to the technical field of baby carriages, and in particular to a baby carriage with a small volume after being folded. Background Art

[0002] In modern family life, baby strollers are an important means of transportation for infants and are favored by more and more families. Conventional baby strollers are usually designed with a wide-spaced rear wheel layout. Although this layout can provide good stability during driving, prevent the vehicle from tipping over, and thus ensure the safety of children, it also has some inherent defects. For example, the wide-spaced rear wheel design causes obstacles to the relative positions of the two rear wheels and the front wheels when the baby stroller is folded. This obstacle not only affects the folding efficiency of the baby stroller, but also requires more space when the baby stroller is stored.

[0003] Therefore, it is necessary to further improve and perfect the prior art to overcome these shortcomings, and the present invention is made based on this situation. Summary of the invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and provide a baby carriage with a small volume after being folded.

[0005] The present invention is achieved through the following technical solutions:

[0006] In order to solve the above technical problems, the present invention provides a baby carriage with a small volume after folding, comprising a front leg assembly, a rear leg assembly and a push rod, wherein the front leg assembly comprises two left-right symmetrical front legs and two front wheels, the rear leg assembly comprises two left-right symmetrical rear legs and two rear wheels, the upper part of the rear leg is rotatably connected to the upper part of the front leg, and the lower part of the push rod is also rotatably connected to the upper part of the front leg;

[0007] A rotating shaft is provided at the upper part of the two front legs or at the lower part of the push rod, and an axial hole which is rotatably matched with the corresponding rotating shaft is provided at the upper part of the two rear legs, and a vertical line B of the projection of the axis line A of the rotating shaft on the horizontal plane is inclined from the back to the front and gradually approaches the middle;

[0008] A linkage folding structure is provided between the push rod and the left and right rear legs, which can drive the two rear legs to fold forward and move them together when the push rod is folded downward.

[0009] In order to further solve the technical problem to be solved by the present invention, the present invention provides a baby carriage with a small volume after folding, wherein the linkage folding structure includes a first connecting rod whose upper end is rotatably connected to the corresponding push rod, the lower part of the first connecting rod is rotatably connected to the second connecting rod, the other end of the second connecting rod is rotatably connected to a rotating block, the rotating block is rotatably connected to a sliding block, and the sliding block is slidably connected to the corresponding rear leg along the length direction of the rear leg.

[0010] In order to further solve the technical problem to be solved by the present invention, in a baby stroller with a small volume when folded, the present invention provides, wherein the second connecting rod is rotatably connected to a third connecting rod, the other end of the third connecting rod is rotatably connected to a fixed block, and the fixed block is fixedly connected to the corresponding rear leg.

[0011] In order to further solve the technical problem to be solved by the present invention, in a baby stroller with a small volume after folding provided by the present invention, in the linkage folding structure on at least one side, a locking structure for limiting the sliding of the slider is provided between the slider and the corresponding rear leg.

[0012] In order to further solve the technical problem to be solved by the present invention, the present invention provides a baby stroller with a small volume when folded, in which the locking structure is fixed to a lock seat in the rear leg, an unlocking block is slidably connected to the lock seat along the length direction of the rear leg, a lock tongue is slidably connected to the lock seat along the left and right directions, a lock hole is provided on the slider for inserting the lock tongue, a first inclined surface is provided on the lock tongue, and a second inclined surface that can cooperate with the first inclined surface is provided on the unlocking block; when the unlocking block moves upward, the lock tongue is driven to disengage from the lock hole through the cooperation of the second inclined surface and the first inclined surface.

[0013] In order to further solve the technical problem to be solved by the present invention, in a baby stroller with a small volume when folded, the present invention provides a first elastic reset member that presses the lock tongue away from the lock hole between the lock tongue and the lock seat, and a second elastic reset member that presses the unlocking block downwards between the unlocking block and the lock seat; a pull rope is connected to the unlocking block, and the other end of the pull rope is connected to an unlocking structure for pulling the pull rope.

[0014] In order to further solve the technical problem to be solved by the present invention, the present invention provides a baby carriage with a small volume after folding, wherein the linkage folding structure includes a first connecting rod, the upper end of the first connecting rod is movably connected to the corresponding push rod through a universal joint, the lower end of the first connecting rod is movably connected to the corresponding rear leg through a universal joint, both rear legs are rotatably connected with a rotating block, both rotating blocks are rotatably connected with a fourth connecting rod, and the other ends of the left and right fourth connecting rods are rotatably connected to each other.

[0015] In order to further solve the technical problem to be solved by the present invention, in a baby stroller with a small volume after folding provided by the present invention, a second locking structure for limiting the rotation of the two fourth connecting rods is provided at the rotation connection of the two fourth connecting rods.

[0016] In order to further solve the technical problem to be solved by the present invention, the present invention provides a baby carriage with a small volume when folded, wherein the second locking structure includes a first spline groove arranged at the end of one of the fourth connecting rods, a second spline groove arranged at the end of the other fourth connecting rod, a spline slidably connected between the first spline groove and the second spline groove, and a driving disk rotatably connected to the first spline groove and capable of driving the spline to move between the first spline groove and the second spline groove, the driving disk is provided with a first rotating inclined surface arranged along the circumferential direction, and the spline is provided with a second rotating inclined surface that can cooperate with the first rotating inclined surface.

[0017] In order to further solve the technical problem to be solved by the present invention, in a baby stroller with a small volume when folded, the present invention provides a third elastic reset member between the spline and the first spline groove for pressing the spline toward the second spline groove; a pulling rope is wrapped around the side of the driving disk, and the other end of the pulling rope is connected to an unlocking structure for pulling the pulling rope to drive the driving disk to rotate.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. In the present invention, the upper shaft of the front leg is rotatably matched with the shaft hole of the upper rear leg, and the vertical line B of the projection of the axis line A of the shaft on the horizontal plane is inclined from the back to the front and gradually approaches the middle. This innovative structural design allows the two rear legs to fold toward the front legs while gradually gathering toward the middle during the folding process, so as to fold between the two front legs. Specifically, when the user performs the folding operation, the rear legs not only move forward but also move toward the middle during the process of rotating to fold. The advantage of this design is that the two rear legs after folding will be folded exactly between the two front legs, significantly reducing the volume of the entire baby carriage. This structural optimization not only improves the portability of the baby carriage, allowing it to occupy less space when stored, but also facilitates the user's use and storage in daily life.

[0020] 2. In the present invention, the arrangement of the linkage folding structure and the locking structure can increase the stability of the baby stroller when it is unfolded, and can realize the linkage folding and quick one-key folding of the baby stroller, making it convenient to use the baby stroller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the first embodiment;

[0023] Figure 2 is an exploded schematic diagram of the first embodiment;

[0024] Figure 3 yes Figure 2A partial enlarged view of point D in the middle;

[0025] Figure 4 is a schematic diagram of the three-dimensional structure of the horizontal rod portion of the first embodiment;

[0026] Figure 5 is a bottom view of the first embodiment;

[0027] Figure 6 is a schematic diagram of the three-dimensional structure of the first embodiment after folding;

[0028] Figure 7 is a schematic diagram of the three-dimensional structure of the second embodiment;

[0029] Figure 8 is a schematic diagram of the three-dimensional structure of the third embodiment;

[0030] Fig. 9 It is a schematic diagram of the decomposition of the locking structure in the third embodiment. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Embodiment 1:

[0033] like Figures 1 to 6 The first embodiment of the present invention is shown, which discloses a baby carriage with a small volume after folding, including a front leg assembly 1, a rear leg assembly 2 and a push rod 3. The front leg assembly 1 includes two left-right symmetrical front legs 11 and two front wheels 12, and the rear leg assembly 2 includes two left-right symmetrical rear legs 21 and two rear wheels 22. The upper part of the rear leg 21 is connected to the upper part of the front leg 11 through rotation to form an effective supporting structure. At the same time, the lower part of the push rod 3 is also connected to the upper part of the front leg 11 through rotation, and the push rod 3 can swing downward to fold.

[0034] The upper part of the front legs 11 is provided with a rotating shaft 111, and the upper part of the rear legs 21 is provided with an axial hole 211 that rotates with the rotating shaft 111. More importantly, the vertical line B of the projection of the axis line A of the rotating shaft 111 on the horizontal plane presents an inclined shape that gradually approaches the middle from the back to the front. This innovative structural design allows the two rear legs 21 to fold toward the front legs 11 and gradually gather toward the middle during the folding process, so as to fold between the two front legs 11. Specifically, when the user performs the folding operation, the rear legs 21 not only move forward but also move toward the middle during the process of rotating to fold. The advantage of this design is that the two rear legs 21 after folding will be folded exactly between the two front legs 11, significantly reducing the volume of the entire baby carriage. This structural optimization not only improves the portability of the baby carriage, allowing it to occupy less space when stored, but also facilitates the use and storage of the user in daily life.

[0035] Furthermore, the specific structure of the rotating shaft 111 and the shaft hole 211 is as follows: the upper part of the front leg 11 is provided with a horizontal rod portion 112 facing horizontally backward, and the tail end of the horizontal rod portion 112 is provided with a shaft seat 113 for installing the rotating shaft 111, and the angle C between the center plane of the shaft seat 113 and the horizontal rod portion 112 is an acute angle. Correspondingly, the upper end of the rear leg 21 is provided with an upwardly bent connecting head 212, and the shaft hole 211 is provided at the upper end of the connecting head 212. The upper end of the connecting head 212 is inserted into the shaft seat 113, and the rotating shaft 111 is inserted into the shaft hole 211 to form a hinged structure. Such a structure can realize the function of "the rear leg 21 not only moves forward but also moves closer to the middle direction during the process of rotating to fold".

[0036] More specifically, an efficient linkage folding structure 4 is provided between the push rod 3 and the left and right rear legs 21, and the design of the structure is to ensure that when the push rod 3 is folded downward, the two rear legs 21 can be driven to fold forward and move together. This design not only improves the portability of the baby stroller, but also makes the folding operation easier and smoother.

[0037] Furthermore, the linkage folding structure 4 on the left and right sides is composed of a plurality of key components, which work together to realize the efficient folding function of the baby carriage. First, the upper end of the first connecting rod 41 is connected to the corresponding push rod 3 by a rotational connection. At the lower part of the first connecting rod 41, a second connecting rod 42 is rotationally connected. The other end of the second connecting rod 42 is rotationally connected to a rotating block 48 (the axis of the rotating block 48 and the axis of the second connecting rod 42 are perpendicular to each other), and a slider 43 is rotationally connected to the rotating block 48. The slider 43 is designed to slide along the length direction of the rear leg 21, so that it can move freely on the track of the rear leg 21. This sliding connection method effectively reduces friction and improves the smoothness of movement.

[0038] In addition, the second connecting rod 42 is also rotatably connected to the third connecting rod 44. The other end of the third connecting rod 44 is rotatably connected to a fixing block 45, and the fixing block 45 is fixed to the corresponding rear leg 21 through a fastener. Through this structure, the third connecting rod 44 can further effectively transmit the movement from the second connecting rod 42 to the fixing block 45, thereby promoting the folding of the rear leg 21. This structure also serves the purpose of increasing the structural strength.

[0039] In actual operation, when the user performs the folding operation, the push rod 3 will swing clockwise to the rear and downward. During this movement, the linkage folding structure 4 will effectively transmit this movement, so that the rear legs 21 will also swing forward clockwise, thereby achieving folding. This process not only makes the rear legs 21 fold forward, but also drives the rear legs 21 to move closer to the middle direction, forming a compact folded state.

[0040] More specifically, in at least one side of the linkage folding structure 4, a locking structure 46 is provided between the slider 43 and the corresponding rear leg 21 for limiting the sliding of the slider 43. The main function of the locking structure 46 is to ensure that the slider 43 is firmly locked in a specific position when the baby stroller is fully unfolded. Through this locking mechanism, the slider 43 will not slide accidentally during the unfolding process, thereby greatly enhancing the overall stability of the baby stroller.

[0041] Furthermore, the locking structure 46 is fixed to a lock seat 461 in the rear leg 21, and an unlocking block 462 is slidably connected to the lock seat 461 along the length direction of the rear leg 21, and a locking tongue 463 is slidably connected to the lock seat 461 along the left and right directions. The slider 43 is provided with a lock hole 431 for the locking tongue 463 to be inserted, the locking tongue 463 is provided with a first inclined surface 4631, and the unlocking block 462 is provided with a second inclined surface 4621 that can cooperate with the first inclined surface 4631.

[0042] When unlocking, when the unlocking block 462 moves upward, the locking tongue 463 is driven to disengage from the locking hole 431 through the cooperation between the second inclined surface 4621 and the first inclined surface 4631 .

[0043] Furthermore, a first elastic reset member 464 is provided between the lock tongue 463 and the lock seat 461, preferably a spring, and the function of this spring is to press the lock tongue 463 in a direction away from the lock hole 431, ensuring that the lock tongue 463 can remain in a locked state when there is no external force. This design increases the safety of locking and avoids the risk of the lock tongue loosening due to unexpected circumstances. Similarly, a second elastic reset member 465 is also provided between the unlocking block 462 and the lock seat 461, preferably a spring, and the function of pressing the unlocking block 462 downwards to ensure that it remains in place when it is not actively operated. The design of these two elastic reset members makes the entire locking and unlocking system have higher reliability and stability.

[0044] In order to facilitate user operation, a pulling rope 474 is connected to the top of the unlocking block 462. The other end of the pulling rope 474 is connected to a special unlocking structure (not shown in the figure), which is preferably a button structure. When the user presses the button, the pulling rope 474 can be effectively pulled, thereby prompting the unlocking block 462 to move upward and trigger the unlocking of the lock tongue 463. This design not only improves the convenience of unlocking, but also ensures that the user can complete the operation quickly and easily during use.

[0045] Embodiment 2:

[0046] like Figure 7The second embodiment of the present invention is shown, which is different from the first embodiment in that the specific structures of the rotating shaft 111 and the shaft hole 211 are different. In this embodiment, the upper ends of the two front legs 11 and the lower end of the push rod 3 are rotatably connected to each other through the rotating shaft 111, and the upper ends of the two rear legs 21 are bent toward the middle and provided with a connecting head 212, and the shaft hole 211 is provided at the upper end of the connecting head 212. The rotating shaft 111 is matched with the shaft hole 211.

[0047] Embodiment three:

[0048] like Figure 8 , Fig. 9 The third embodiment of the present invention is shown, which is different from the first and second embodiments described above in that the linkage folding structure 4 is different.

[0049] In this embodiment, the linkage folding structure 4 includes a first connecting rod 41, the upper end of the first connecting rod 41 is movably connected to the corresponding push rod 3 through a universal joint, and the lower end of the first connecting rod 41 is movably connected to the corresponding rear leg 21 through a universal joint, and both rear legs 21 are rotatably connected with a rotating block 48, and both rotating blocks 48 are rotatably connected with a fourth connecting rod 49, and the other ends of the left and right fourth connecting rods 49 are rotatably connected to each other.

[0050] Furthermore, a second locking structure 47 for limiting the rotation of the two fourth connecting rods 49 is provided at the rotation connection of the two fourth connecting rods 49.

[0051] Furthermore, the second locking structure 47 includes a first spline groove 491 provided at the end of one of the fourth connecting rods 49, a second spline groove 492 provided at the end of the other fourth connecting rod 49, a spline 471 slidably connected between the first spline groove 491 and the second spline groove 492, and a driving disk 472 rotatably connected in the first spline groove 491 and capable of driving the spline 471 to move between the first spline groove 491 and the second spline groove 492.

[0052] Specifically, the driving disk 472 is provided with a first rotating inclined surface 4721 arranged along the circumferential direction, and the spline 471 is provided with a second rotating inclined surface 4711 that can cooperate with the first rotating inclined surface 4721 .

[0053] A third elastic reset member 473 (preferably a spring) is provided between the spline 471 and the first spline groove 491 for pressing the spline 471 toward the second spline groove 492;

[0054] A pulling rope 474 is wound around the side of the driving disk 472, and the other end of the pulling rope 474 is connected to an unlocking structure for pulling the pulling rope 474 to drive the driving disk 472 to rotate (not shown in the figure, the structure has been described above and will not be repeated here).

[0055] Working principle:

[0056] a) Locked state: the spline 471 is simultaneously embedded in the first spline groove 491 and the second spline groove 492 , limiting the relative rotation of the two fourth connecting rods 49 .

[0057] b) Unlocking process:

[0058] *Pull the pulling rope 474 to drive the driving disc 472 to rotate.

[0059] *The first rotational inclined surface 4721 of the driving plate 472 interacts with the second rotational inclined surface 4711 of the spline 471.

[0060] *The spline 471 is pushed out of the second spline groove 492 and remains only in the first spline groove 491 .

[0061] * The two fourth connecting rods 49 can rotate relative to each other to achieve the folding of the baby carriage.

[0062] c) Reset: After the pulling rope 474 is loosened, the spline 471 will be re-embedded in the second spline groove 492 under the action of the third elastic reset member 473 to restore the locked state.

[0063] This improved linkage folding structure 4 achieves a more convenient and safe folding function while ensuring the stability of the baby carriage.

Claims

1. A baby stroller with a small volume after folding, characterized in that: The invention comprises a front leg assembly (1), a rear leg assembly (2) and a push rod (3), wherein the front leg assembly (1) comprises two front legs (11) and two front wheels (12) which are symmetrical on the left and right, and the rear leg assembly (2) comprises two rear legs (21) and two rear wheels (22) which are symmetrical on the left and right, and the upper part of the rear leg (21) is rotatably connected to the upper part of the front leg (11), and the lower part of the push rod (3) is also rotatably connected to the upper part of the front leg (11); A rotating shaft (111) is provided at the upper part of the two front legs (11) or the lower part of the push rod (3), and an axial hole (211) is provided at the upper part of the two rear legs (21) for rotating with the corresponding rotating shaft (111), and a vertical line B of the projection of the axis line A of the rotating shaft (111) on the horizontal plane is inclined from the back to the front and gradually approaches the middle; A linkage folding structure (4) is provided between the push rod (3) and the left and right rear legs (21), which can drive the two rear legs (21) to fold forward and move them together when the push rod (3) is folded downward.

2. A baby stroller with a small volume after folding according to claim 1, characterized in that: The linkage folding structure (4) comprises a first connecting rod (41) whose upper end is rotatably connected to the corresponding push rod (3); the lower part of the first connecting rod (41) is rotatably connected to the second connecting rod (42); the other end of the second connecting rod (42) is rotatably connected to a rotating block (48); the rotating block (48) is rotatably connected to a sliding block (43); the sliding block (43) is slidably connected to the corresponding rear leg (21) along the length direction of the rear leg (21).

3. A baby stroller with a small volume after folding according to claim 2, characterized in that: The second connecting rod (42) is also rotatably connected to a third connecting rod (44), and the other end of the third connecting rod (44) is rotatably connected to a fixing block (45), and the fixing block (45) is fixedly connected to the corresponding rear leg (21).

4. A baby stroller with a small volume after folding according to claim 2 or 3, characterized in that: In the linked folding structure (4) on at least one side, a locking structure (46) for limiting the sliding of the slider (43) is provided between the slider (43) and the corresponding rear leg (21).

5. A baby stroller with a small volume after folding according to claim 4, characterized in that: The locking structure (46) is fixed to a locking seat (461) in the rear leg (21); an unlocking block (462) is slidably connected to the locking seat (461) along the length direction of the rear leg (21); a locking tongue (463) is slidably connected to the locking seat (461) along the left-right direction; a locking hole (431) for inserting the locking tongue (463) is provided on the slider (43); a first inclined surface (4631) is provided on the locking tongue (463); and a second inclined surface (4621) that can cooperate with the first inclined surface (4631) is provided on the unlocking block (462); when the unlocking block (462) moves upward, the locking tongue (463) is driven to disengage from the locking hole (431) through the cooperation of the second inclined surface (4621) and the first inclined surface (4631).

6. A baby stroller with a small volume after folding according to claim 5, characterized in that: A first elastic return member (464) is provided between the lock tongue (463) and the lock seat (461) for pressing the lock tongue (463) in a direction away from the lock hole (431), and a second elastic return member (465) is provided between the unlocking block (462) and the lock seat (461) for pressing the unlocking block (462) downward; a pulling rope (474) is connected to the unlocking block (462), and the other end of the pulling rope (474) is connected to an unlocking structure for pulling the pulling rope (474).

7. A baby stroller with a small volume after folding according to claim 1, characterized in that: The linkage folding structure (4) comprises a first connecting rod (41), the upper end of which is movably connected to the corresponding push rod (3) via a universal joint, the lower end of which is movably connected to the corresponding rear leg (21) via a universal joint, both rear legs (21) are rotatably connected to a rotating block (48), both rotating blocks (48) are rotatably connected to a fourth connecting rod (49), and the other ends of the left and right fourth connecting rods (49) are rotatably connected to each other.

8. A baby stroller with a small volume after folding according to claim 7, characterized in that: A second locking structure (47) for limiting the rotation of the two fourth connecting rods (49) is provided at the rotation connection point of the two fourth connecting rods (49).

9. A baby stroller with a small volume after folding according to claim 8, characterized in that: The second locking structure (47) includes a first spline groove (491) provided at the end of one of the fourth connecting rods (49), a second spline groove (492) provided at the end of the other fourth connecting rod (49), a spline (471) slidably connected between the first spline groove (491) and the second spline groove (492), and a driving disk (472) rotatably connected in the first spline groove (491) and capable of driving the spline (471) to move between the first spline groove (491) and the second spline groove (492), the driving disk (472) being provided with a first rotating inclined surface (4721) arranged along the circumferential direction, and the spline (471) being provided with a second rotating inclined surface (4711) capable of cooperating with the first rotating inclined surface (4721).

10. A baby stroller with a small volume after folding according to claim 9, characterized in that: A third elastic reset member (473) is provided between the spline (471) and the first spline groove (491) for pressing the spline (471) toward the second spline groove (492); a pulling rope (474) is wound around the side of the driving disk (472), and the other end of the pulling rope (474) is connected to an unlocking structure for pulling the pulling rope (474) to drive the driving disk (472) to rotate.

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