A child stroller

Abstract

The invention discloses a child stroller, comprising a frame and a height-adjustable seat mechanism, wherein the seat mechanism comprises: an upper rod, which is used to form a seat or to install a seat; a bottom rod, which is arranged on the frame; a first connecting rod, which has an upper end rotatably connected to the upper rod and a lower end rotatably connected to the bottom rod; and a second connecting rod, which has an upper end rotatably connected to the upper rod and a lower end rotatably connected to the bottom rod, and the second connecting rod is located at the rear side of the first connecting rod; wherein the seat mechanism has a high-gear state and a low-gear state, when the seat mechanism is in the high-gear state, the upper rod is at a first height; when the seat mechanism is in the low-gear state, the upper rod is at a second height; and the first height is greater than the second height. The child stroller can achieve the purpose of adjusting the seat height with a relatively simple structure.

Description

Technical Field

[0001] The invention relates to a baby stroller. Background Art

[0002] In the prior art, a stroller includes a stroller frame having an unfolded position and a folded position, a frame locking mechanism for locking the stroller frame in the unfolded position, a front wheel assembly, a rear wheel assembly, and a seat arranged on the stroller frame. The stroller frame includes seat support seats located on the left and right sides. The seat includes a seat frame and mounting frames located on the left and right sides of the seat frame. Usually, the positions where the mounting frames are mounted on the seat support seats are fixed. In an improved stroller, the seat height can be adjusted to change the field of vision of the child sitting in the stroller, such as a stroller with a seat height that can be quickly adjusted as disclosed in Chinese patent CN205469234U. Currently adjustable strollers are basically more complex in structure and more expensive. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide a child stroller, the seat height of which can be adjusted and the structure of which is relatively simple.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] A baby stroller, comprising a frame and a height-adjustable seat mechanism, wherein the seat mechanism comprises:

[0006] An upper rod, which is used to form a seat or to mount a seat;

[0007] A bottom bar, which is arranged on the frame;

[0008] a first connecting rod having an upper end rotatably connected to the upper rod and a lower end rotatably connected to the bottom rod; and

[0009] A second connecting rod having an upper end rotatably connected to the upper rod and a lower end rotatably connected to the bottom rod, the second connecting rod being located at a rear side of the first connecting rod;

[0010] Wherein, the seat mechanism has a high-gear state and a low-gear state. When the seat mechanism is in the high-gear state, the upper rod is at a first height; when the seat mechanism is in the low-gear state, the upper rod is at a second height; the first height is greater than the second height.

[0011] Preferably, when the seat mechanism is in a low gear state, the upper surface of the upper rod and the upper surface of the bottom rod are at the same height.

[0012] Preferably, the upper end of the first connecting rod is rotatably connected to the upper rod via a first pivot, the upper end of the second connecting rod is rotatably connected to the upper rod via a second pivot, the lower end of the second connecting rod is rotatably connected to the bottom rod via a third pivot, and the lower end of the first connecting rod is rotatably connected to the bottom rod via a fourth pivot.

[0013] More preferably, the sum of the distance between the first pivot and the second pivot and the distance between the first pivot and the fourth pivot is equal to the sum of the distance between the third pivot and the second pivot and the distance between the third pivot and the fourth pivot.

[0014] Furthermore, the axis lines of the first pivot, the second pivot, the third pivot and the fourth pivot are parallel to each other.

[0015] Preferably, the bottom bar has at least two connection parts connected to the frame, and the two connection parts are respectively connected to different positions of the frame.

[0016] Preferably, the frame has an unfolded state and a folded state, the seat mechanism has an unfolded state corresponding to the unfolded state of the frame and has a folded state corresponding to the folded state of the frame, and when the frame is converted from the unfolded state to the folded state, the seat mechanism is simultaneously converted from the unfolded state to the folded state along with the conversion of the frame.

[0017] Preferably, the vehicle frame comprises a left vehicle frame and a right vehicle frame, and the bottom bar is disposed on both the left vehicle frame and the right vehicle frame.

[0018] More preferably, the left frame and the right frame both include a push rod, a front wheel bracket, a rear wheel bracket, a third connecting rod, a fourth connecting rod and a sliding member slidably arranged on the push rod, the upper end portion of the front wheel bracket and the upper end portion of the rear wheel bracket are respectively rotatably connected to the sliding member, the lower end portion of the push rod is fixedly connected to or integrally formed with the front end portion of the third connecting rod, the rear end portion of the third connecting rod is rotatably connected to the front end portion of the fourth connecting rod, the fourth connecting rod is rotatably connected to the rear wheel bracket, the front portion of the bottom rod is arranged on the front wheel bracket, and the rear portion of the bottom rod is arranged on the push rod and / or the third connecting rod.

[0019] Furthermore, the left frame and the right frame also include a fifth connecting rod, one end of the fifth connecting rod is rotatably connected to the front wheel bracket, the other end of the fifth connecting rod is rotatably connected to the front end of the bottom bar, and the rear end of the bottom bar is rotatably connected to the lower end of the push rod and / or the front end of the third connecting rod.

[0020] Furthermore, the rear end of the bottom bar is rotatably connected to the lower end of the push rod, so that a deformable four-bar linkage is formed among the bottom bar, the push rod, the front wheel and the fifth link.

[0021] Preferably, the child stroller comprises a locking mechanism for locking the four-bar linkage.

[0022] More preferably, the locking mechanism includes a locking pin arranged on the upper end of the upper rod or the second connecting rod, and the sliding member is provided with a locking hole matching with the locking pin, and when the seat mechanism is in a high-speed position, the locking pin is inserted into the locking hole.

[0023] In combination with the above, the present invention adopts the above technical solution, which has the following advantages compared with the prior art:

[0024] In the stroller of the present invention, the upper rod, the bottom rod, the first connecting rod and the second connecting rod are rotatably connected to form a four-bar linkage. As the four-bar linkage is deformed, the height of the upper rod changes accordingly, and the height of the seat or seat pocket on the upper rod can be adjusted with a relatively simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 is a three-dimensional schematic diagram of a child stroller according to an embodiment of the present invention, wherein the seat is in a high-position state;

[0027] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0028] Figure 3 for Figure 1 a side view of the stroller shown;

[0029] Figure 4 is a three-dimensional schematic diagram of a child stroller according to an embodiment of the present invention, wherein the seat is in a low gear state;

[0030] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0031] Figure 6 for Figure 4 A side view of the stroller shown.

[0032] in,

[0033] 1. Frame; 1a. Left frame; 1b. Right frame; 11. Push rod; 110. Sliding sleeve; 12. Front wheel bracket; 13. Rear wheel bracket; 14. Third connecting rod; 15. Fourth connecting rod; 16. Fifth connecting rod;

[0034] 2. Front wheel;

[0035] 3. Rear wheel;

[0036] 4. Seat mechanism; 41. Upper rod; 42. Bottom rod; 420. Main body section; 421. Front end; 422. Rear end; 43. First connecting rod; 44. Second connecting rod; 45. Seat pocket;

[0037] 5. Locking mechanism; 51. Lock pin. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art.

[0039] The directional words such as "upper", "lower", "front", and "back" mentioned herein are defined based on the conventional perspective of a person skilled in the art on a child stroller in an unfolded state.

[0040] Reference Figures 1 to 6 As shown, this embodiment provides a child stroller, specifically a child stroller with an adjustable seat height. Figure 1 and Figure 4 As shown, the baby stroller comprises a frame 1, front wheels 2, rear wheels 3 and a height-adjustable seat mechanism 4. The front wheels 2 are arranged at the bottom front part of the frame 1, the rear wheels 3 are arranged at the bottom rear part of the frame 1, and the seat mechanism 4 is arranged on the frame 1.

[0041] Combination Figure 2 and Figure 5 As shown, the seat mechanism 4 specifically includes an upper rod 41, a bottom rod 42, a first connecting rod 43 and a second connecting rod 44. The first connecting rod 43 has an upper end rotatably connected to the upper rod 41 and a lower end rotatably connected to the bottom rod 42. The second connecting rod 44 has an upper end rotatably connected to the upper rod 41 and a lower end rotatably connected to the bottom rod 42. The second connecting rod 44 is located at the rear side of the first connecting rod 43. A four-bar linkage mechanism is formed between the upper rod 41, the second connecting rod 44, the bottom rod 42 and the first connecting rod 43, which is recorded as a first four-bar linkage mechanism. The bottom rod 42 is arranged on the frame 1, and has two connecting parts respectively connected to different positions of the frame 1. The upper rod 41 extends roughly in the front-to-back direction. The upper rod 41 can be directly used as a seat rod constituting a seat; or, a seat (such as Figure 1 and Figure 4As the four-bar linkage deforms, the height of the upper rod 41 changes accordingly. Thus, the seat mechanism 4 has the following characteristics: Figure 1 and Figure 3 The high gear status shown and Figure 4 and Figure 6 When the seat mechanism 4 is in the high gear state, the upper rod 41 is at a first height; when the seat mechanism 4 is in the low gear state, the upper rod 41 is at a second height. The first height is greater than the second height. Thus, the height of the seat pocket 45 mounted on the upper rod 41 is adjusted.

[0042] Specifically, the bottom bar 42 is mainly composed of a front extension section 421, a main body section 420 and a rear extension section 422. The main body section 420 extends in the front-to-back direction, the front extension section 421 extends downward and forward from the front end of the main body section 420, and the rear extension section 422 extends downward and backward from the rear end of the main body section 420. The upper end of the first link 43 is rotatably connected to the front end of the upper bar 41 through the first pivot a, the upper end of the second link 44 is rotatably connected to the rear end of the upper bar 41 through the second pivot b, the lower end of the second link 44 is rotatably connected to the rear end of the main body section 420 through the third pivot c, and the lower end of the first link 43 is rotatably connected to the front end of the main body section 420 through the fourth pivot d. The axis lines of the first pivot a, the second pivot b, the third pivot c and the fourth pivot d are parallel to each other and extend horizontally along the left-right direction of the child stroller. The front extension section 421 and the rear extension section 422 of the bottom bar 42 are the two connecting parts mentioned above, which are respectively connected to two different positions of the frame 1 .

[0043] The sum of the distance between the first pivot a and the second pivot b and the distance between the first pivot a and the fourth pivot d is equal to the sum of the distance between the third pivot c and the second pivot b and the distance between the third pivot c and the fourth pivot d, that is, the distance between the pivots ab + the distance between the pivots ad = the distance between the pivots cb + the distance between the pivots cd. More preferably, the length of the first link 43 is equal to the length of the second link 44, and the quadrilateral formed by the above-mentioned four-bar linkage is a parallelogram. Figure 5 As shown, when the seat mechanism 4 is in the low gear state, the upper rod 41 and the second connecting rod 44 overlap, the main section 420 of the bottom rod 42 overlaps the first connecting rod 43, and the upper surface of the upper rod 41 and the upper surface of the bottom rod 42 are at the same height. The main section 420 of the bottom rod 42 also has a groove that matches the first connecting rod 43. When the above-mentioned four-bar linkage is contracted and deformed downward until the first connecting rod 43 enters the groove on the bottom rod 42, the upper rod 41 and the second connecting rod 44 overlap, and the seat mechanism 4 is in the low gear state.

[0044] The frame 1 is foldable and has an unfolded state and a folded state. The seat mechanism 4 can be folded along with the frame 1, and the bottom bar 42 can be further foldably connected to the frame 1 along with the frame 1. For example, the frame 1 includes a plurality of rods, and the plurality of rods are movably connected so as to be relatively unfolded and folded. Another four-bar linkage is formed between the bottom bar 42 and some rods of the frame 1, which is recorded as a second four-bar linkage. The present embodiment provides a specific example of a frame 1. The frame 1 specifically includes a left frame 1a and a right frame 1b, and the left frame 1a and the right frame 1b are connected by a connecting rod. The left frame 1a and the right frame 1b are foldable and have an unfolded state and a folded state, and both side frames include: a push rod 11, a front wheel bracket 12, a rear wheel bracket 13, a third connecting rod 14, and a fourth connecting rod 15. As Figure 3 and 6 As shown, in the left frame 1a or the right frame 1b, a sliding member is provided on the push rod 11, and the sliding member is specifically a sliding sleeve 110 slidably provided on the push rod 11; the upper end of the front wheel bracket 12 and the upper end of the rear wheel bracket 13 are rotatably connected to the sliding sleeve 110 respectively; the push rod 11 and the third connecting rod 14 are integrally formed, the third connecting rod 14 generally extends in the front-back direction, and the lower end of the push rod 11 is connected to the front end of the third connecting rod 14; the rear end of the third connecting rod 14 is rotatably connected to the upper end of the fourth connecting rod 15, and the fourth connecting rod 15 is rotatably connected to the rear wheel bracket 13. The front wheel 2 is provided at the lower end of the front wheel bracket 12, and the rear wheel 3 is provided at the lower end of the rear wheel bracket 13.

[0045] The left frame 1a is provided with the above-mentioned first four-bar linkage, and the right frame 1b is also provided with the above-mentioned first four-bar linkage. The bottom end of the seat pocket 45 is plugged into the upper rod 41 of the first four-bar linkage on both sides. The bottom rod 42 of the first four-bar linkage on both sides is respectively arranged on the front wheel bracket 12 and the push rod 11 and / or the third link 14 on the corresponding side. Furthermore, the bottom rod 42 and the rod of the side frame on the corresponding side form a second four-bar linkage, so that the seat mechanism 4 can be folded with the frame 1 without affecting the folding of the side frame 1. Specifically, Figure 2 As shown, the left side frame 1a and the right side frame 1b further include a fifth link 16, one end of the fifth link 16 is rotatably connected to the front wheel bracket 12, the other end of the fifth link 16 is rotatably connected to the front end of the bottom bar 42, and the rear end of the bottom bar 42 is rotatably connected to the lower end of the push rod 11 and / or the front end of the third link 14. The rear end of the bottom bar 42 is specifically rotatably connected to the lower end of the push rod 11, and the bottom bar 42, the push rod 11, the front wheel bracket 12 and the fifth link 16 constitute the above-mentioned second four-bar linkage. When the frame 1 is folded, the second four-bar linkage can be deformed, so that the bottom bar 42 of the seat mechanism 4 can be folded along with the frame 1.

[0046] The child stroller includes a locking mechanism 5 for locking the seat mechanism 4. The locking mechanism 5 can be arranged between the rods of the seat mechanism 4, or between the rods of the seat mechanism 4 and the frame 1. In a specific example, the locking mechanism 5 includes a locking pin 51 arranged on the upper end of the second connecting rod 44, and a locking hole (not shown in the figure) matching with the locking pin 51 is arranged on the sliding sleeve 110. When the seat mechanism 4 is in the high position state, the locking pin 51 is inserted into the locking hole to lock the seat mechanism 4.

[0047] The seat height adjustment process of the stroller is described as follows: the first four-bar linkage of the seat mechanism 4 is unlocked (the locking pin 51 is disengaged from the locking hole on the sliding sleeve 110), and the first four-bar linkage is deformed backward and downward until the upper rod 41 reaches a position roughly flush with the main section 420 of the bottom rod 42, and the seat mechanism 4 is converted from the high gear state to the low gear state. Conversely, the first four-bar linkage is deformed upward, the upper rod 41 moves upward, and the locking pin 51 on the second link 44 is inserted into the locking hole of the sliding sleeve 110, and the seat mechanism 4 is stably in the high gear state.

[0048] The above embodiments are only for illustrating the technical concept and features of the present invention, and are preferred implementation methods. Their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A baby stroller, comprising a frame and a height-adjustable seat mechanism, characterized in that: The seat mechanism comprises: An upper rod, which is used to form a seat or to mount a seat; A bottom bar, which is arranged on the frame; a first connecting rod having an upper end rotatably connected to the upper rod and a lower end rotatably connected to the bottom rod; and A second connecting rod having an upper end rotatably connected to the upper rod and a lower end rotatably connected to the bottom rod, the second connecting rod being located at a rear side of the first connecting rod; Wherein, the seat mechanism has a high-position state and a low-position state. When the seat mechanism is in the high-position state, the upper rod is at a first height; when the seat mechanism is in the low-position state, the upper rod is at a second height; the first height is greater than the second height; The bottom bar has at least two connection parts connected to the frame, and the two connection parts are respectively connected to different positions of the frame; The frame comprises a left side frame and a right side frame, the bottom bar is arranged on the left side frame and the right side frame; the left side frame and the right side frame each comprise a push rod, a front wheel bracket, a rear wheel bracket, a third connecting rod, a fourth connecting rod and a sliding member slidably arranged on the push rod, the upper end portion of the front wheel bracket and the upper end portion of the rear wheel bracket are rotatably connected to the sliding member respectively, the lower end portion of the push rod is fixedly connected to or integrally formed with the front end portion of the third connecting rod, the rear end portion of the third connecting rod is rotatably connected to the front end portion of the fourth connecting rod, the fourth connecting rod is rotatably connected to the rear wheel bracket, the front portion of the bottom bar is arranged on the front wheel bracket, and the rear portion of the bottom bar is arranged on the push rod and / or the third connecting rod; The left frame and the right frame also include a fifth connecting rod, one end of which is rotatably connected to the front wheel bracket, the other end of which is rotatably connected to the front end of the bottom bar, and the rear end of the bottom bar is rotatably connected to the lower end of the push rod and / or the front end of the third connecting rod.

2. The baby stroller according to claim 1, characterized in that: When the seat mechanism is in a low gear state, the upper surface of the upper rod and the upper surface of the bottom rod are at the same height.

3. The baby stroller according to claim 1, characterized in that: The upper end of the first connecting rod is rotatably connected to the upper rod via a first pivot, the upper end of the second connecting rod is rotatably connected to the upper rod via a second pivot, the lower end of the second connecting rod is rotatably connected to the bottom rod via a third pivot, and the lower end of the first connecting rod is rotatably connected to the bottom rod via a fourth pivot, and the sum of the distance between the first pivot and the second pivot and the distance between the first pivot and the fourth pivot is equal to the sum of the distance between the third pivot and the second pivot and the distance between the third pivot and the fourth pivot.

4. The stroller according to claim 3, characterized in that: Axial centers of the first pivot, the second pivot, the third pivot, and the fourth pivot are parallel to each other.

5. The baby stroller according to claim 1, characterized in that: The frame has an unfolded state and a folded state, the seat mechanism has an unfolded state corresponding to the unfolded state of the frame and has a folded state corresponding to the folded state of the frame, and when the frame is converted from the unfolded state to the folded state, the seat mechanism is simultaneously converted from the unfolded state to the folded state along with the conversion of the frame.

6. The stroller according to claim 1, characterized in that: The rear end of the bottom bar is rotatably connected to the lower end of the push rod, so that a deformable four-bar linkage is formed among the bottom bar, the push rod, the front wheel and the fifth link.

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