Stroller

Abstract

This invention discloses a stroller, comprising a frame having an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly located at the bottom of the frame, the frame including a front support, a rear support, a side rod, a push rod, a rear support, a front swing frame and a rear swing frame. In the unfolded state, the front support, the side rod, and the push rod each extend backward from bottom to top, the rear support extends forward from bottom to top, the rear support extends vertically, the rear support and the rear support intersect each other and are rotatably connected at the intersection, the upper part of the rear support is rotatably connected to the lower part of the push rod, the front swing frame and the rear swing frame each extend in the front-rear direction, and the lower part of the rear support can both rotate relative to each other and slide relative to the rear swing frame along the extension direction of the rear swing frame. The folding principle of this stroller is simple; the entire stroller can be folded by simply pressing down and forward on the push rod.

Description

Technical Field

[0001] This invention relates to the field of children's products, and more specifically to a children's stroller. Background Technology

[0002] In the existing technology, the structures of foldable strollers vary and the folding principles are also different. However, most foldable strollers are cumbersome to fold, and the folded frame still occupies a lot of space, which brings great inconvenience to daily carrying and storage. Therefore, how to simplify the folding operation of strollers while providing stable load-bearing support, and at the same time minimize the overall size of the stroller after folding, has always been a goal pursued by those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to provide a stroller that solves one or more problems of the prior art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a children's stroller, comprising a frame having an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly disposed at the bottom of the frame, the frame including a front support, a rear support, a side frame, a push rod frame, a rear support frame, a front swing frame and a rear swing frame, the frame being in the unfolded state, the front support, the side frame and the push rod frame each extending backward at an angle from bottom to top, the rear support extending forward at an angle from bottom to top, the front wheel assembly being disposed at the bottom of the front support, the rear wheel assembly being disposed at the bottom of the rear support, two of the upper parts of the front support, the upper parts of the rear support and the lower parts of the side frame being rotatably connected and the third being rotatably connected to one of the aforementioned two, or the upper parts of the front support, the upper parts of the rear support and the lower parts of the side frame being rotatably connected around the same rotation center line, the upper part of the side frame and the lower part of the push rod frame being rotatably connected.

[0005] The rear support extends vertically and intersects with the rear bracket, rotatably connecting at the intersection. The upper part of the rear support is rotatably connected to the lower part of the push rod frame. The front swing frame and the rear swing frame each extend longitudinally. The lower part of the rear support can both rotate relative to the rear swing frame and slide relative to the rear swing frame along its extension direction.

[0006] The front part of the front swing frame is rotatably connected to the front support about a first rotation center line, the rear part of the front swing frame is rotatably connected to the front part of the rear swing frame about a second rotation center line, and the rear part of the rear swing frame is rotatably connected to the rear support about a third rotation center line. The first rotation center line, the second rotation center line, and the third rotation center line are parallel to each other. The projections of the first rotation center line, the second rotation center line, and the third rotation center line on the same vertical plane respectively form a first turning point, a second turning point, and a third turning point. The second turning point is located vertically above the line connecting the first turning point and the third turning point.

[0007] Preferably, the lower part of the rear support frame is rotatably connected to a first sliding member, which is slidably disposed on the rear swing frame along the length extension direction of the rear swing frame.

[0008] Preferably, when the frame is in the unfolded state, the rear swing frame extends upwards gradually from back to front, and the front swing frame extends upwards gradually from front to back, forming an inverted "V" shape between the front swing frame and the rear swing frame.

[0009] Preferably, the front part of the front swing frame is rotatably connected to the lower end of the front support, the rear part of the rear swing frame is rotatably connected to the lower end of the rear support, and the first rotation center line in the vertical direction is higher than the third rotation center line.

[0010] Preferably, the upper part of the front bracket, the upper part of the rear bracket, and the lower part of the side rod are rotatably connected around a rotation center line, which is located above the second rotation center line.

[0011] Furthermore, during the process of the frame transitioning from an unfolded state to a folded state, the second rotation center line moves upward toward the rotation center line.

[0012] Preferably, the rear support frame is rotatably connected to the rear bracket about a fourth rotation center line. The vehicle frame also includes a seat frame that extends in the front-rear direction. The rear part of the seat frame is rotatably connected to the rear support frame about a fifth rotation center line, which is located above the fourth rotation center line. The front part of the seat frame is slidably provided with a second sliding member, which is rotatably connected to the upper part of the front bracket, the upper part of the rear bracket, or the lower part of the side frame.

[0013] Furthermore, the upper part of the front bracket, the upper part of the rear bracket, the lower part of the side rod bracket, and the second sliding member are rotatably connected together around the rotation center line.

[0014] Preferably, when the frame is in the unfolded state, the front support, the side rod frame, and the push rod frame extend backward from bottom to top along the same length direction; when the frame is in the folded state, the front support, the front swing frame, the rear swing frame, and the rear support are folded together from front to back in sequence, and the rear support frame, the side rod frame, and the push rod frame are folded together behind the rear support frame.

[0015] In some embodiments, the frame is foldable in the left-right direction, wherein the front support includes two front struts disposed on the left and right sides, the rear support includes two rear struts disposed on the left and right sides, the rear support includes two rear support rods disposed on the left and right sides, located on the left and right sides of the frame, the upper part of the front strut is rotatably connected to the upper part of the rear support rod, and the rear support rod and the rear support rod intersect each other and are rotatably connected at the intersection;

[0016] The frame also includes a cross brace assembly that can be folded in the left-right direction. The cross brace assembly includes at least a rear cross brace assembly that can be folded in the left-right direction. The rear cross brace assembly is disposed between the lower part of the rear support rod and the lower part of the rear strut on both sides.

[0017] Furthermore, the rear cross brace assembly is a cross brace assembly, which includes two diagonal braces that cross each other and are rotatably connected at the intersection. When the frame is in the unfolded state, the diagonal braces extend in the front-rear direction. The front part of the diagonal brace is rotatably connected to the lower part of the rear support rod on one side, and the rear part of the diagonal brace is rotatably connected to the lower part of the rear support rod on the other side.

[0018] Preferably, the cross brace assembly further includes a front cross brace assembly capable of folding in the left-right direction. The front cross brace assembly is disposed between the lower parts of the two front support rods. The frame also includes a linkage frame that, during the rotation and folding of the rear support relative to the rear bracket, causes the front cross brace assembly to fold in the left-right direction.

[0019] Furthermore, the front cross brace assembly includes two front crossbars extending in the left-right direction. Each front crossbar has a first end and a second end located at opposite ends in its own length direction. The two first ends are adjacent and rotatably connected about a first axis. The two second ends are rotatably connected about a second axis to the front support rod on the same side. When the frame is in a folded state, the two front crossbars are folded together between the two front support rods, and the first end is located above the second end.

[0020] The linkage frame includes two linkage rods located on the left and right sides respectively. One end of the linkage rod is rotatably connected to the lower part of the rear support rod, and the other end of the linkage rod is connected to the front crossbar through a connector located between the first shaft and the second shaft.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The stroller of the present invention has fewer frame members and a simple structure. The frame has good stability in the unfolded state and can provide stable support for children. When folding the frame, simply press down and push the push rod frame forward to complete the folding of the frame. The folded stroller is small in size and easy to carry and store. Attached Figure Description

[0022] Appendix Figure 1 This is a three-dimensional structural diagram of the stroller according to Embodiment 1 of the present invention;

[0023] Appendix Figure 2 For the appendix Figure 1 Enlarged view of point A in the middle;

[0024] Appendix Figure 3 For the appendix Figure 1 A side view diagram;

[0025] Appendix Figure 4 For the appendix Figure 1 Rear view diagram;

[0026] Appendix Figure 5 For the appendix Figure 1 A 3D structural diagram illustrating the first step of folding a stroller;

[0027] Appendix Figure 6 For the appendix Figure 5 Enlarged view of point B in the middle;

[0028] Appendix Figure 7 For the appendix Figure 5 A side view diagram;

[0029] Appendix Figure 8 For the appendix Figure 5 Rear view diagram;

[0030] Appendix Figure 9 For the appendix Figure 1 A 3D structural diagram illustrating the second step of the folding process for a children's stroller;

[0031] Appendix Figure 10 For the appendix Figure 1 A side view of a stroller in its folded state;

[0032] Appendix Figure 11 This is a three-dimensional structural diagram of the stroller in Example 2;

[0033] Appendix Figure 12 For the appendix Figure 11 A three-dimensional structural diagram of a children's stroller viewed from below;

[0034] Appendix Figure 13 For the appendix Figure 11 A side view diagram;

[0035] Appendix Figure 14 For the appendix Figure 13 A diagram illustrating the folding process of a children's stroller;

[0036] Appendix Figure 15 For the appendix Figure 13 A diagram showing a stroller in a folded state;

[0037] The components are: 100, frame; 200, front wheel assembly; 300, rear wheel assembly;

[0038] 1. Front support; 11. Front support rod; 111. Front connector; 12. Front connecting rod; 2. Rear support; 21. Rear support rod; 22. Crossbar; 23. Rear connecting rod; 24. Rear connector; 3. Side rod frame; 31. Side rod; 32. Connector; 4. Push rod frame; 41. Push rod part; 42. Grip part; 421. Upper crossbar; 422. Connecting rod; 422a. First rod end; 422b. Second rod end; 43. Connecting part; 5. Rear support frame; 51. First sliding member; 511. First sleeve; 512. Second sleeve; 52. Rear support rod; 53. Front crossbar; 6. Front swing frame; 61 61. Front swing arm; 62. Rear crossbar; 7. Rear swing frame; 71. Rear swing arm; 8. Seat frame; 81. Second sliding member; 811. First sleeve; 812. Second sleeve; 82. Seat post; 9. Cross brace assembly; 91. Front cross brace assembly; 911. Front crossbar; 911a. First end; 911b. Second end; 912. First shaft; 913. Second shaft; 914. Connector; 92. Rear cross brace assembly; 921. Diagonal brace; 93. Seat cross brace assembly; 931. Cross brace; 931a. First support rod; 931b. Second support rod; 94. Linkage frame; 941. Linkage rod;

[0039] X1, First rotation center line; X2, Second rotation center line; X3, Third rotation center line; X4, Fourth rotation center line; X5, Fifth rotation center line; X6, Sixth rotation center line; X7, Seventh rotation center line. Detailed Implementation

[0040] The following descriptions of directions such as up, down, left, right, front, back, inside, and outside are defined with reference to the directions observed by the person pushing the stroller when the stroller is in its unfolded state. The purpose is solely to clearly illustrate the relative positional relationships of the various levers / components on the stroller.

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] See Figures 1 to 10 As shown, a stroller includes a frame 100 having an unfolded state and a folded state, a front wheel assembly 200 and a rear wheel assembly 300 located at the bottom of the frame 100. The frame 100 includes a front support 1, a rear support 2, side bars 3, push rods 4, a rear support 5, a front swing arm 6, and a rear swing arm 7. When the frame 100 is in the unfolded state, the front support 1, side bars 3, and push rods 4 each extend backward from bottom to top, and the rear support 2 extends forward from bottom to top. The front wheel assembly 200 is located at the bottom of the front support 1, and the rear wheel assembly 300 is located at the bottom of the rear support 2. Two of the three components—the upper part of the front support 1, the upper part of the rear support 2, and the lower part of the side rod 3—are rotatably connected, and the third component is rotatably connected to one of the aforementioned two components. Alternatively, the upper part of the front support 1, the upper part of the rear support 2, and the lower part of the side rod 3 are rotatably connected around the same rotation center line. The upper part of the side rod 3 is rotatably connected to the lower part of the push rod frame 4.

[0044] The rear support 5 extends in the vertical direction. The rear support 5 and the rear bracket 2 intersect each other and are rotatably connected at the intersection. The upper part of the rear support 5 is rotatably connected to the lower part of the push rod frame 4. The front swing frame 6 and the rear swing frame 7 each extend in the front-rear direction. The lower part of the rear support 5 can both rotate relative to each other and slide relative to the rear swing frame 7 along the extension direction of the rear swing frame 7.

[0045] The front part of the front swing frame 6 is rotatably connected to the front support 1 around the first rotation center line X1. The rear part of the front swing frame 6 is rotatably connected to the front part of the rear swing frame 7 around the second rotation center line X2. The rear part of the rear swing frame 7 is rotatably connected to the rear support 2 around the third rotation center line X3. The first rotation center line X1, the second rotation center line X2, and the third rotation center line X3 are parallel to each other.

[0046] Referring to the accompanying drawings, in the unfolded state, the front part of the front swing arm 6 is rotatably connected to the lower end of the front support 1, and the rear part of the rear swing arm 7 is rotatably connected to the lower end of the rear support 2. The specific structural configuration of the frame 100 is as follows:

[0047] The front support 1 includes a front strut 11 extending vertically and a front connecting strut 12 extending horizontally. The front strut 11 includes two sets located on the left and right sides. Each set of front struts 11 has a front connector 111 fixed at its lower part. The front connector 111 extends vertically, with its upper end fixed to the front strut 11 and extending downward from the bottom of the front strut 11 in a direction perpendicular to its length. The front connecting strut 12 connects the two sets of front connectors 111, and the axis of the front connecting strut 12 extends collinearly with the first rotation center line X1. The front part of the front swing arm 6 is rotatably connected to the front connecting strut 12 about its axis. The front wheel assembly 200 includes two sets located on the left and right sides, with each set of front wheel assemblies 200 located at the bottom of the two sets of front struts 11.

[0048] See Figure 1 As shown, the front swing arm 6 is a U-shaped rod with its opening facing downwards. It has a front swing arm 61 extending in the front-to-back direction and a rear crossbar 62 extending horizontally in the left-to-right direction. The front swing arm 61 includes two sets located on the left and right sides respectively. The front ends of the two sets of front swing arms 61 are rotatably connected to the front connecting rod 12 about the axis of the front connecting rod 12. The rear ends of the two sets of front swing arms 61 are fixed to the left and right ends of the rear crossbar 62 respectively. The distance between the front ends of the two sets of front swing arms 61 in the left-to-right direction is greater than the distance between their rear ends in the left-to-right direction. Therefore, in the left-to-right direction, the length of the front connecting rod 12 is greater than the length of the rear crossbar 62.

[0049] See Figure 1 , Figure 4 As shown, the rear swing frame 7 includes two sets of rear swing rods 71 ​​located on the left and right sides respectively. In the unfolded state, the two sets of rear swing rods 71 ​​extend from back to front and upward at an angle. The distance between the upper ends of the two sets of rear swing rods 71 ​​in the left and right direction is smaller than the distance between the lower ends in the left and right direction. In this embodiment, the axis of the rear crossbar 62 extends collinearly with the second rotation center line X2. The front ends of the two sets of rear swing rods 71 ​​are rotatably connected to the rear crossbar 62 around the axis of the rear crossbar 62.

[0050] See Figure 1 , Figure 2 As shown, the rear support 2 includes a rear support rod 21 that extends forward from bottom to top in the unfolded state. The rear support rod 21 includes two sets located on the left and right sides respectively. The distance between the top of the two sets of rear support rods 21 in the left-right direction is greater than the distance between the bottom of the two sets of rear support rods 21 in the left-right direction. The lower part of the rear support 2 is also fixed with a rear connector 24 that extends forward. The rear connector 24 includes two sets located on the left and right sides. The two sets of rear connectors 24 are located at the lower part of the two sets of rear support rods 21 respectively. Their rear ends are fixed on the rear support rods 21 and extend forward from the bottom of the rear support rods 21 in a direction perpendicular to the length of the rear support rods 21. On each side of the frame 100, the rear end of the rear swing arm 71 is rotatably connected to the rear connector 24 around the third rotation center line X3.

[0051] The first rotation center line X1, the second rotation center line X2, and the third rotation center line X3 all extend in the left and right direction. When the frame 100 is in the unfolded state, in the vertical direction, the first rotation center line X1 is higher than the third rotation center line X3, and the second rotation center line X2 is higher than the first rotation center line X1.

[0052] The rear bracket 2 also includes a horizontal crossbar 22 extending horizontally in the left-right direction and a rear connecting rod 23, see [link / reference]. Figure 4 , Figure 8 As shown, the crossbar 22 is connected between the upper ends of the two sets of rear support rods 21 in the left-right direction, and the rear connecting rod 23 is connected between the lower ends of the two sets of rear support rods 21 in the left-right direction. The rear wheel assembly 300 includes two sets disposed on the left and right sides, and the two sets of rear wheel assemblies 300 are respectively located on the left and right sides of the rear connecting rod 23.

[0053] In this embodiment, the upper part of the front support 1, the upper part of the rear support 2, and the lower part of the side rod frame 3 are rotatably connected around the rotation center line. Specifically, the side rod frame 3 includes two sets of side rods 31 located on the left and right sides respectively. The two sets of side rods 31 are arranged parallel to each other and extend backward at an angle from bottom to top. The axis of the crossbar 22 extends collinearly with the rotation center line and is located on each side of the frame 100. The upper end of the front support rod 11, the upper end of the rear support rod 21, and the lower end of the side rod 31 are rotatably connected around the axis of the crossbar 22. In the vertical direction, the rotation center line is located above the second rotation center line X2.

[0054] In this embodiment, the rear support frame 5 includes a rear support rod 52 that extends backward from bottom to top in the unfolded state and a front crossbar 53 that extends horizontally in the left and right direction. The rear support rod 52 includes two sets located on the left and right sides respectively. The front crossbar 53 is connected between the lower ends of the two sets of rear support rods 52 and is located on each side of the frame 100. The lower part of the rear support rod 52 intersects with the middle part of the rear support rod 21. The two are rotatably connected around the fourth rotation center line X4. Along the length extension direction of the rear support rod 52, the fourth rotation center line X4 is located above the front crossbar 53.

[0055] The lower part of the rear support frame 5 is rotatably connected to a first sliding member 51, which is slidably mounted on the rear swing frame 7 along its length. Specifically, see [link to details]. Figure 1 , Figure 2As shown, the first sliding member 51 includes two sets located on the left and right sides respectively. Each set of the first sliding member 51 includes a first sleeve 511 and a second sleeve 512 fixedly connected to each other. The first sleeve 511 extends horizontally in the left and right direction and has a hollow cavity extending in its own length direction. Both sets of first sleeves 511 are sleeved on the front crossbar 53. They can rotate around the axis of the front crossbar 53 and slide towards each other or away from each other in the length direction of the front crossbar 53. The second sleeve 512 is located below the first sleeve 511. The length extension direction of each set of second sleeves 512 is consistent with the length extension direction of the rear swing arm 71 on that side. They are located on each side of the frame 100. The second sleeve 512 is sleeved on the rear swing arm 71 and can slide in the length direction of the rear swing arm 71.

[0056] The frame 100 also includes a seat frame 8, which extends in the front-rear direction. Its rear portion is rotatably connected to the rear support frame 5 about a fifth rotation center line X5. A second sliding member 81 is slidably fitted to the front portion of the seat frame 8, and the second sliding member 81 is rotatably connected to the upper portion of the front support 1, the upper portion of the rear support 2, or the lower portion of the side support frame 3. See also... Figure 1 , Figure 2 and Figure 6 As shown, the seat frame 8 includes two sets of seat rods 82 located on the left and right sides respectively. The two sets of seat rods 82 are arranged in parallel, and in the unfolded state, the two sets of seat rods 82 extend from back to front and upward at an angle, located on each side of the frame 100. The rear end of the seat rod 82 is rotatably connected to the rear support rod 52 around the fifth rotation center line X5. The fifth rotation center line X5 and the fourth rotation center line X4 both extend in the left and right direction, and the fifth rotation center line X5 is located above the fourth rotation center line X4 along the length extension direction of the rear support rod 52. The second sliding member 81 includes two sets disposed on the left and right sides. Each set has a first sleeve 811 and a second sleeve 812 fixedly connected together. The first sleeve 811 extends in the front-rear direction and has a hollow cavity extending in its own length direction. It is located on each side of the frame 100. The first sleeve 811 is sleeved on the seat post 82 and can slide along the length direction of the seat post 82. The second sleeve 812 is located below the first sleeve 811. Both sets of second sleeves 812 are sleeved on the crossbar 22 and can rotate around the axis of the crossbar 22. The second sliding member 81 is connected to the upper part of the front bracket 1, the upper part of the rear bracket 2, and the lower part of the side rod 3 through the second sleeve 812 in a rotatable manner around the rotation center line.

[0057] In this embodiment, the push rod frame 4 is integrally set. When the frame 100 is in the unfolded state, the push rod frame 4 is a U-shaped rod with the opening facing downward. It has a push rod part 41 that extends backward from bottom to top and a grip part 42 that extends in the left and right direction. The push rod part 41 includes two sets located on the left and right sides respectively. The grip part 42 is connected between the upper ends of the two sets of push rod parts 41 in the left and right direction. The push rod frame 4 also includes a connecting part 43 fixed to the lower end of the push rod part 41. The connecting part 43 includes two sets located on the left and right sides respectively. The two sets of connecting parts 43 extend downward and backward from the lower end of the push rod part 41 on that side respectively. Located on each side of the frame 100, the lower end of the push rod 41 is rotatably connected to the upper end of the side rod 31 around the sixth rotation center line X6, and the upper end of the rear swing rod 71 is rotatably connected to the lower end of the connecting part 43 around the seventh rotation center line. The sixth rotation center line X6 and the seventh rotation center line X7 both extend in the left and right direction. Along the length extension direction of the connecting part 43, the sixth rotation center line X6 is located above the seventh rotation center line X7.

[0058] The frame 100 is in the unfolded state, see [reference]. Figures 1 to 4 As shown, the front support 1, side rod 3, and push rod 4 extend backward from bottom to top along the same length direction. The rear support 5 is supported between the push rod 4, the rear support 2, and the rear swing arm 7. The first sliding member 51 is located in the middle of the rear swing arm 71, the seat frame 8 is located in front of the rear support 5, and the second sliding member 81 is located in the middle of the seat rod 82. In this state, the first rotation center line X1, the second rotation center line X2, and the third rotation center line X3 are projected onto the same vertical plane, and correspondingly form the first rotation point a, the second rotation point b, and the third rotation point c. See [reference needed]. Figure 3 As shown, the second pivot point b is located vertically above the line connecting the first pivot point a and the third pivot point c. The front swing arm 6, located between the first pivot point a and the second pivot point b, gradually tilts upward from front to back. The rear swing arm 7, located between the second pivot point b and the third pivot point c, gradually tilts upward from back to front. The front swing arm 6 and the rear swing arm 7 form an inverted "V" shape, with the second pivot point b located at the intersection of the "V". This makes the frame 100 more aesthetically pleasing when viewed from the side. At the same time, a large space is reserved at the bottom of the front swing arm 6 and the rear swing arm 7, which facilitates the installation of a storage rack underneath, providing a large storage space for carrying items in the vehicle. At this time, the front wheel assembly 200 and the rear wheel assembly 300 are located at the front and rear sides of the bottom of the frame 100, respectively, and both are supported on the ground. In this state, the child can sit on the seat frame 8, and the caregiver can push the push rod frame 4 to drive the stroller forward.

[0059] When the stroller needs to be folded, see [link / reference]. Figures 5 to 9As shown, firstly, the push rod frame 4 is pressed down, causing the connection between the push rod frame 4 and the side rod frame 3 to move downwards, and driving the rear support frame 5 and the side rod frame 3 to flip backwards. The rear support frame 5 drives the rear swing frame 7 to fold relative to the rear support 2 through the first sliding member 71. During this process, the first sliding member 51 slides upwards along the length direction of the rear swing rod 71, and at the same time, the two sets of first sliding members 51 slide towards each other along the length extension direction of the front crossbar 53. As the rear swing frame 7 moves backwards, it drives the front swing frame 6 and the front support 1 to fold backwards relative to the rear support 2. The seat rod 82 also moves backwards under the drive of the rear support frame 5 and slides relative to the second sliding member 81. Then, the push rod frame 4 is pushed forward, causing it to fold relative to the side rod frame 3, and together with the side rod frame 3, it folds relative to the rear support 2. During this process, the front support 1, the front swing frame 6, and the rear swing frame 7 continue to fold backwards relative to the rear support 2. During the entire folding process, the second rotation center line X2 moves upward towards the rotation center line. At the same time, the front swing frame 6 and the rear swing frame 7, which are connected in an inverted "V" shape, can move smoothly upward. Compared with the form of connection along the horizontal direction, the entire folding stroke is smaller, the required flipping angle is smaller, and the folding operation is smoother and less strenuous.

[0060] The frame 100 is in a folded state, see [link / reference]. Figure 10 As shown, the front support 1, front swing frame 6, rear swing frame 7 and rear support 2 are retracted from front to back in sequence. The rear support frame 5, side rod frame 3 and push rod frame 4 are retracted behind the rear support 2. At this time, the first sliding member 51 slides to the front end of the rear swing rod 71, the second sliding member 81 slides to the front end of the seat rod 82, and the front wheel assembly 200 and the rear wheel assembly 300 are retracted together. In the left and right direction, the two sets of rear wheel assemblies 300 are located between the two sets of front wheel assemblies 200.

[0061] Example 2

[0062] See Figures 11 to 15 As shown, the main difference between this embodiment and Embodiment 1 is that:

[0063] In this embodiment, the lower part of the side rod 31 is rotatably connected to the connector 32. On the left and right sides of the frame 100, the side rod 31 is connected to the upper part of the connector 32. The upper part of the front support rod 11 and the upper part of the rear support rod 21 are rotatably connected to the lower part of the connector 32. The second sliding member 81 is rotatably connected to the lower part of the side rod 3.

[0064] The front swing arm 6 consists of only two front swing arms 61 located on the left and right sides. The front support 1 does not have a front connecting rod 12. On the left and right sides of the frame 100, the front part of the front swing arm 61 is rotatably connected to the front part of the front support rod 11, and the rear part of the front swing arm 61 is rotatably connected to the front part of the rear swing arm 71.

[0065] Furthermore, the frame 100 of this embodiment can also be folded in the left-right direction. Specifically, the frame 100 is provided with a cross brace assembly 9 that can be folded in the left-right direction. The cross brace assembly 9 includes a rear cross brace assembly 92, which is disposed between the lower part of the rear support rods 52 on both sides and the lower part of the rear support rods 21. In this embodiment, the rear cross brace assembly 92 is a cross brace assembly, which includes two diagonal support rods 921 that cross each other and are rotatably connected at the intersection. When the frame 100 is in the unfolded state, the diagonal support rods 921 extend in the front-rear direction. The front part of the diagonal support rod 921 is rotatably connected to the lower part of one side of the rear support rod 52, and the rear part of the diagonal support rod 921 is rotatably connected to the lower part of the other side of the rear support rod 21.

[0066] The cross brace assembly 9 also includes a front cross brace assembly 91, which is disposed between the lower parts of the two front support rods 11. The frame 100 also includes a linkage frame 94 that, during the rotation and folding of the rear support frame 5 relative to the rear bracket 2, causes the front cross brace assembly 91 to fold in the left-right direction. Specifically, the front cross brace assembly 91 includes two front cross rods 911 extending in the left-right direction. Each front cross rod 911 has a first end 911a and a second end 911b located at opposite ends in its length direction. The two first ends 911a are adjacent and rotatably connected around a first axis 912. The two second ends 911b are rotatably connected to the front support rod 11 on the same side around a second axis 913. The first axis 912 and the second axis 913 are parallel to each other and both extend in the up-down direction.

[0067] The linkage frame 94 includes two linkage rods 914 located on the left and right sides respectively. On each side of the frame 100, the rear end of the linkage rod 914 is rotatably connected to the lower part of the rear support rod 52, and the front end of the linkage rod 914 is connected to the front crossbar 911 through a connector 914. The connector 914 can be specifically configured as a universal joint, which is located between the first shaft 912 and the second shaft 913.

[0068] In this embodiment, the cross brace assembly 9 also includes a seat cross brace assembly 93 disposed between the two side seat rods 82 and the second sliding member 81. The seat cross brace assembly 93 consists of two sets of cross braces 931 located on the left and right sides. Each set of cross braces 931 is formed by the first support rod 931a and the second support rod 931b crossing and rotatably connected at the intersection. One end of the two first support rods 931a is rotatably connected together, and the other end of the two first support rods 931a is rotatably connected to the second sliding member 81 on both sides respectively. One end of the two second support rods 931b is rotatably connected together, and the other end of the two second support rods 931b is rotatably connected to the rear of the seat rods 82 on both sides respectively.

[0069] See Figure 11As shown, in this embodiment, the gripping part 42 consists of an upper crossbar 421 extending in the left-right direction and two sets of connecting rods 422 located on the left and right sides of the upper crossbar 421. The connecting rods 422 have a first rod end 422a and a second rod end 422b. The first rod end 422a of the connecting rod 422 is rotatably connected to the upper part of the push rod part 41 around the axis of the push rod part 41. When the frame 100 is in the unfolded state, the two sets of connecting rods 422 extend upward from the upper part of the two sets of push rod parts 41 and bend towards each other in the left-right direction. The left end and right end of the upper crossbar 421 are rotatably connected to the second rod ends 422b of the two connecting rods 422. A locking mechanism is provided between the upper crossbar 421 and the connecting rod 422 to lock the two together. After the lock between the upper crossbar 421 and the connecting rod 422 is released, the upper crossbar 421 is driven to move forward. The second rod ends 422b of the two connecting rods 422 move forward together with the upper crossbar 421. The connecting rod 422 and the push rod part 41 rotate relative to each other. At the same time, the connecting rod 422 drives the push rod parts 41 on the left and right sides to move towards each other and fold.

[0070] With the frame 100 in its extended state, the side support frame 3 and the push rod frame 4 extend backward from bottom to top along the same length direction. The state and positional relationship between the rear support frame 5, the front swing frame 6, the rear swing frame 7, and the rear support frame 2 are similar to those in Embodiment 1. In this state, the cross brace assembly 9 extends in the left-right direction. Specifically, the cross brace assembly 92 and the seat cross brace assembly 93 extend in the left-right direction, and the cross brace assembly 92 is located below the rear swing frame 7; the two front crossbars 911 extend in the same direction, and the front cross brace assembly 91 extends entirely in the left-right direction; the connecting rod 422 of the grip 42 and the upper crossbar 421 are locked together and extend in the same direction, and the push rod frame 4 also extends in the left-right direction.

[0071] See Figure 13 , Figure 14 As shown, the process of folding the frame 100 in the front-to-back direction is the same as in Embodiment 1. During the process of pressing down and pushing the push rod frame 4 forward, the user can release the lock between the upper crossbar 421 and the connecting rod 422, causing the push rod frame 4 to fold in the left-to-right direction. During the flipping of the rear support frame 5, the lower part of the rear support rod 52 drives the cross support assembly 92 to fold in the left-to-right direction. At the same time, the rear support rod 52 drives the two front crossbars 911 to rotate in opposite directions and fold in the same direction through the linkage rod 914. During the relative sliding of the second sliding member 81 and the seat rod 82, the seat cross support assembly 93 is driven to fold in the left-to-right direction, and finally the frame 100 is folded in the left-to-right direction.

[0072] The frame 100 is in a folded state, see [link / reference]. Figure 15As shown, the front support 1, front swing frame 6, rear swing frame 7, and rear support 2 are folded together sequentially from front to back. The side frame 3 and push rod frame 4 are folded behind the rear support 2. The two front crossbars 911 are folded together between the two front support rods 11, with the first end 911a located above the second end 911b. In this state, the frame 100 is folded together in the front-to-back direction, and at the same time, the frame 100 is also folded together in the left-to-right direction, further reducing the volume occupied by the folded trolley.

[0073] In summary, through the cooperation between the various rods, the stroller of the present invention can provide stable load-bearing support in the unfolded state. Its structure is simple and beautiful. At the same time, the stroller can be folded by simply pressing down the push rod frame 4 and pushing it forward. The folding operation is simple, and the folded stroller occupies less space, making it easy to store and organize.

[0074] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A stroller, comprising a frame having an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly disposed at the bottom of the frame, characterized in that: The frame includes a front support, a rear support, side struts, a push rod, a rear support, a front swing arm, and a rear swing arm. In the deployed state, the front support, side struts, and push rods each extend backward at an angle from bottom to top, while the rear support extends forward at an angle from bottom to top. The front wheel assembly is located at the bottom of the front support, and the rear wheel assembly is located at the bottom of the rear support. Two of the upper parts of the front support and the upper parts of the rear support, and the lower parts of the side struts, are rotatably connected, and the third is rotatably connected to one of the aforementioned two. Alternatively, the upper parts of the front support, the upper parts of the rear support, and the lower parts of the side struts are rotatably connected around the same rotation center line. The upper part of the side strut is rotatably connected to the lower part of the push rod. The rear support extends vertically and intersects with the rear bracket, rotatably connecting at the intersection. The upper part of the rear support is rotatably connected to the lower part of the push rod frame. The front swing frame and the rear swing frame each extend longitudinally. The lower part of the rear support can both rotate relative to the rear swing frame and slide relative to the rear swing frame along its extension direction. The front part of the front swing frame is rotatably connected to the front support about a first rotation center line, the rear part of the front swing frame is rotatably connected to the front part of the rear swing frame about a second rotation center line, and the rear part of the rear swing frame is rotatably connected to the rear support about a third rotation center line. The first rotation center line, the second rotation center line, and the third rotation center line are parallel to each other. The projections of the first rotation center line, the second rotation center line, and the third rotation center line on the same vertical plane respectively form a first turning point, a second turning point, and a third turning point. The second turning point is located vertically above the line connecting the first turning point and the third turning point. The front swing arm has a front swing arm extending in the front-to-back direction and a rear crossbar extending horizontally in the left-to-right direction. The front swing arm includes two sets located on the left and right sides respectively. The rear swing frame includes two sets of rear swing rods located on the left and right sides respectively. In the unfolded state, the two sets of rear swing rods extend from back to front and upward at an angle. The distance between the upper ends of the two sets of rear swing rods in the left-right direction is smaller than the distance between the lower ends in the left-right direction. The front ends of the two sets of rear swing rods are rotatably connected to the rear crossbar around the axis of the rear crossbar. The rear support frame includes a rear support rod extending backward at an upward angle from bottom to top in the unfolded state and a front crossbar extending horizontally in the left-right direction. The rear support rod includes two sets located on the left and right sides respectively. The lower part of the rear support frame is rotatably connected to a first sliding member. The first sliding member includes two sets located on the left and right sides respectively. Each set of the first sliding member includes a first sleeve and a second sleeve fixedly connected to each other. Both sets of the first sleeves are sleeved on the front crossbar. The two sets of the first sleeves can rotate around the axis of the front crossbar and can slide towards or away from each other along the length direction of the front crossbar. The second sleeve is sleeved on the rear swing rod and can slide along the length direction of the rear swing rod.

2. The stroller according to claim 1, characterized in that: When the frame is in the unfolded state, the rear swing frame gradually tilts upward from back to front, and the front swing frame gradually tilts upward from front to back, forming an inverted "V" shape between the front swing frame and the rear swing frame.

3. The stroller according to claim 1, characterized in that: The front part of the front swing frame is rotatably connected to the lower end of the front support, and the rear part of the rear swing frame is rotatably connected to the lower end of the rear support, with the first rotation center line being higher than the third rotation center line in the vertical direction.

4. The stroller according to claim 1, characterized in that: The upper part of the front support, the upper part of the rear support, and the lower part of the side rod are rotatably connected around a rotation center line, which is located above the second rotation center line.

5. The stroller according to claim 4, characterized in that: During the transition of the vehicle frame from the unfolded state to the folded state, the second rotation center line moves upward toward the rotation center line.

6. The stroller according to claim 1, characterized in that: The rear support frame is rotatably connected to the rear bracket around a fourth rotation center line. The frame also includes a seat frame that extends in the front-rear direction. The rear part of the seat frame is rotatably connected to the rear support frame around a fifth rotation center line, which is located above the fourth rotation center line. The front part of the seat frame is slidably provided with a second sliding member, which is rotatably connected to the upper part of the front bracket, the upper part of the rear bracket, or the lower part of the side frame.

7. The stroller according to claim 6, characterized in that: The upper part of the front bracket, the upper part of the rear bracket, the lower part of the side rod bracket, and the second sliding member are rotatably connected together around the rotation center line.

8. The stroller according to any one of claims 1, characterized in that: When the frame is in the unfolded state, the front support, the side rod frame, and the push rod frame extend backward from bottom to top along the same length direction; when the frame is in the folded state, the front support, the front swing frame, the rear swing frame, and the rear support are folded together from front to back in sequence, and the rear support frame, the side rod frame, and the push rod frame are folded together behind the rear support frame.

9. A stroller, comprising a frame having an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly disposed at the bottom of the frame, characterized in that: The frame includes a front support, a rear support, side struts, a push rod, a rear support, a front swing arm, and a rear swing arm. In the deployed state, the front support, side struts, and push rods each extend backward at an angle from bottom to top, while the rear support extends forward at an angle from bottom to top. The front wheel assembly is located at the bottom of the front support, and the rear wheel assembly is located at the bottom of the rear support. Two of the upper parts of the front support and the upper parts of the rear support, and the lower parts of the side struts, are rotatably connected, and the third is rotatably connected to one of the aforementioned two. Alternatively, the upper parts of the front support, the upper parts of the rear support, and the lower parts of the side struts are rotatably connected around the same rotation center line. The upper part of the side strut is rotatably connected to the lower part of the push rod. The rear support extends vertically and intersects with the rear bracket, rotatably connecting at the intersection. The upper part of the rear support is rotatably connected to the lower part of the push rod frame. The front swing frame and the rear swing frame each extend longitudinally. The lower part of the rear support can both rotate relative to the rear swing frame and slide relative to the rear swing frame along its extension direction. The front part of the front swing frame is rotatably connected to the front support about a first rotation center line, the rear part of the front swing frame is rotatably connected to the front part of the rear swing frame about a second rotation center line, and the rear part of the rear swing frame is rotatably connected to the rear support about a third rotation center line. The first rotation center line, the second rotation center line, and the third rotation center line are parallel to each other. The projections of the first rotation center line, the second rotation center line, and the third rotation center line on the same vertical plane respectively form a first turning point, a second turning point, and a third turning point. The second turning point is located vertically above the line connecting the first turning point and the third turning point. The frame can be folded in the left and right directions. The front support includes two front support rods located on the left and right sides, the rear support includes two rear support rods located on the left and right sides, and the rear support includes two rear support rods located on the left and right sides of the frame. The upper part of the front support rod is rotatably connected to the upper part of the rear support rod, and the rear support rod and the rear support rod intersect each other and are rotatably connected at the intersection. The frame also includes a cross brace assembly that can be folded in the left-right direction. The cross brace assembly includes at least a rear cross brace assembly that can be folded in the left-right direction. The rear cross brace assembly is disposed between the lower part of the rear support rod and the lower part of the rear strut on both sides. The rear cross brace assembly is a cross brace assembly. The cross brace assembly includes two diagonal braces that cross each other and are rotatably connected at the intersection. When the frame is in the unfolded state, the diagonal braces extend in the front-rear direction. The front part of the diagonal brace is rotatably connected to the lower part of the rear support rod on one side, and the rear part of the diagonal brace is rotatably connected to the lower part of the rear strut on the other side. The cross brace assembly also includes a front cross brace assembly that can be folded in the left and right direction. The front cross brace assembly is disposed between the lower parts of the front support rods on both sides. The frame also includes a linkage frame that, during the rotation and folding of the rear support frame relative to the rear bracket, causes the front cross brace assembly to fold in the left and right direction. The front cross brace assembly includes two front crossbars extending in the left and right directions. Each front crossbar has a first end and a second end located at opposite ends in its own length direction. The two first ends are adjacent and rotatably connected about a first axis, and the two second ends are rotatably connected about a second axis to the front support bar on the same side. The linkage frame includes two linkage rods located on the left and right sides respectively. One end of the linkage rod is rotatably connected to the lower part of the rear support rod, and the other end of the linkage rod is connected to the front crossbar through a connector located between the first shaft and the second shaft.

10. The stroller according to claim 9, characterized in that: When the frame is folded, the two front crossbars are folded together between the two front support bars, and the first end is located above the second end.

11. The stroller according to claim 9, characterized in that: The lower part of the rear support frame is rotatably connected to a first sliding member, which is slidably disposed on the rear swing frame along the length extension direction of the rear swing frame.

12. The stroller according to claim 9, characterized in that: When the frame is in the unfolded state, the rear swing frame gradually tilts upward from back to front, and the front swing frame gradually tilts upward from front to back, forming an inverted "V" shape between the front swing frame and the rear swing frame.

13. The stroller according to claim 9, characterized in that: The front part of the front swing frame is rotatably connected to the lower end of the front support, and the rear part of the rear swing frame is rotatably connected to the lower end of the rear support, with the first rotation center line being higher than the third rotation center line in the vertical direction.

14. The stroller according to claim 9, characterized in that: The rear support frame is rotatably connected to the rear bracket around a fourth rotation center line. The frame also includes a seat frame that extends in the front-rear direction. The rear part of the seat frame is rotatably connected to the rear support frame around a fifth rotation center line, which is located above the fourth rotation center line. The front part of the seat frame is slidably provided with a second sliding member, which is rotatably connected to the upper part of the front bracket, the upper part of the rear bracket, or the lower part of the side frame.

15. The stroller according to any one of claims 9, characterized in that: When the frame is in the unfolded state, the front support, the side rod frame, and the push rod frame extend backward from bottom to top along the same length direction; when the frame is in the folded state, the front support, the front swing frame, the rear swing frame, and the rear support are folded together from front to back in sequence, and the rear support frame, the side rod frame, and the push rod frame are folded together behind the rear support frame.

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