A child stroller frame with foldable rear wheel set

Abstract

The invention discloses a child stroller frame with a foldable rear wheel group, comprising a front foot rod, a rear foot rod, a rear wheel group, a support rod, a handlebar rod, and a rear linkage member, wherein a linkage assembly is provided between the rear linkage member and the rear wheel group, and the linkage assembly can pull the rear wheel group to rotate and fold toward the inner side of the rear foot rod when the frame is changed from an unfolded state to a folded state; when folding, the rear linkage member pulls the rear wheel group to rotate and fold toward the inner side of the rear foot rod through the linkage assembly, so the invention can make the frame folding and unfolding convenient, and the overall volume of the frame is minimized after the frame is folded; at the same time, when the frame is folded and placed, because the outer side surface of the rear wheel group is arranged in a plane and is arranged downward relative to the frame, the rear wheel group can be more closely fitted to the supporting surface, so that the frame can be placed upright and stably, which is convenient for users to take or place.

Description

[Technical field]

[0001] The invention relates to a baby carriage, in particular to a baby carriage frame with a foldable rear wheel set. [Background technology]

[0002] At present, when the foldable child stroller frame is stored or transported on the ground or shelf of the support surface, the frame is placed horizontally. Although this frame placement method is stable, it is not convenient for users to place or take the frame. That is, when placing or taking the frame, the user needs to bend down or squat to touch the frame, which makes it difficult to place or take. At the same time, the current foldable frame also uses the front and rear wheels to lean against the support surface so that the frame is placed upright as a whole. However, this design structure has high requirements for the center of gravity after folding and the flatness of the support surface, otherwise it is difficult to place it upright. In addition, different people will have different results when operating, so there is a lot of randomness in whether it can be placed upright after folding, which brings a lot of inconvenience to users.

[0003] In addition, the foldable child stroller frames currently on the market also have the problem that the overall volume of the frame is relatively large after being folded.

[0004] Therefore, the present invention is studied and proposed in view of the above problems. [Summary of the invention]

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a child stroller frame with a foldable rear wheel group, which can improve the problems existing in the prior art. After folding, the frame can be placed upright stably, that is, maintained in a standing state, which is convenient for users to place and take. At the same time, after the frame is folded, the overall volume of the frame is minimized.

[0006] The present invention is achieved through the following technical solutions:

[0007] A child stroller frame with a foldable rear wheel set, which can be transformed from an unfolded state to a folded state after a locking structure is unlocked, comprising:

[0008] A front foot rod 1, wherein the lower end of the front foot rod 1 is connected to a front wheel set 11.

[0009] The rear foot rod 2 has a lower end rotatably connected to a rear wheel set 21, and the upper end of the front foot rod 1 is rotatably connected to the upper end of the rear foot rod 2.

[0010] The support rod 3 has a lower end which is rotatably connected to the upper end of the front foot rod 1 or the upper end of the rear foot rod 2.

[0011] A handlebar 4 is rotatably connected to the upper end of the support rod 3 near the lower end of the handlebar 4.

[0012] A rear linkage 5, wherein the upper end of the rear linkage 5 is rotatably connected to the lower end of the handlebar 4, the lower part of the rear linkage 5 is rotatably connected to the rear foot rod 2, and a front linkage rod 6 rotatably connected to the lower end of the rear linkage 5 and the front foot rod 1 is provided between the two.

[0013] A linkage assembly 8 is provided between the rear linkage member 5 and the rear wheel assembly 21 , which can pull the rear wheel assembly 21 to rotate and fold toward the inside of the rear leg rod 2 when the frame is transformed from the unfolded state to the folded state.

[0014] As described above, a child stroller frame with a foldable rear wheel assembly, the rear wheel assembly 21 includes a lower connecting seat 211 and a wheel 212 rotatably connected to the lower connecting seat 211, and the upper end of the lower connecting seat 211 is rotatably connected to the lower end of the rear foot rod 2 around the first axis A1. The linkage assembly 8 includes an upper linkage rod 81, a middle linkage block 82 and a lower linkage block 83, the upper end of the upper linkage rod 81 is rotatably connected to the rear linkage member 5 around the second axis A2, the lower end of the upper linkage rod 81 is rotatably connected to the upper end of the middle linkage block 82 around the third axis A3, the lower end of the middle linkage block 82 is rotatably connected to the upper end of the lower linkage block 83 around the fourth axis A4, and the lower end of the lower linkage block 83 is rotatably connected to the lower connecting seat 211 around the fifth axis A5.

[0015] In the above-mentioned child stroller frame with foldable rear wheel set, the lower connecting seat 211 has a limiting groove 2111. The lower end of the rear foot rod 2 is fixedly provided with an upper connecting seat 22, and the upper connecting seat 22 is formed with a limiting protrusion 221 that can cooperate with the limiting groove 2111 to prevent the rear wheel set 21 from rotating toward the outside of the rear foot rod 2 when the rear wheel set 21 is in the unfolded state.

[0016] In the above-mentioned child stroller frame with a foldable rear wheel set, the upper connecting seat 22 is fixedly connected with an upper limit block 222, and the lower connecting seat 211 is fixedly connected with a lower limit block 2112 that can abut against the upper limit block 222 when the rear wheel set 21 is in an unfolded state, the upper limit block 222 and the lower limit block 2112 are made of metal materials, and the upper connecting seat 22 and the lower connecting seat 211 are made of plastic materials. The lower end of the lower linkage block 83 is rotatably connected to the lower limit block 2112 around the fifth axis A5.

[0017] In the above-mentioned child stroller frame with foldable rear wheels, the upper limit block 222 is placed in the injection mold when the upper connecting seat 22 is injection molded so that the two are formed into an integral structure. Or the lower limit block 2112 is placed in the injection mold when the lower connecting seat 211 is injection molded so that the two are formed into an integral structure.

[0018] In the above-mentioned child stroller frame with foldable rear wheels, the rear leg rod 2 is fixedly connected with a fixing seat 23, and the fixing seat 23 is provided with a hole sleeve 231 for the upper linkage rod 81 to pass through and enable the upper linkage rod 81 to slide and swing therein.

[0019] As described above, a child stroller frame with a foldable rear wheel group further includes a seat support 7, the front side of the seat support 7 is rotatably connected to the support rod 3 and close to the lower end of the support rod 3, and a rear connecting rod 71 is provided between the rear side of the seat support 7 and the rear linkage 5, which is rotatably connected to the two.

[0020] In the above-mentioned child stroller frame with foldable rear wheels, the front side of the seat support 7 has a front connecting rod 72 , and the upper end of the front connecting rod 72 is rotatably connected to the support rod 3 and close to the lower end of the support rod 3 .

[0021] As described above, a child stroller frame with a foldable rear wheel group, the rear linkage 5 includes a rear linkage rod 51 and a protruding rod 52, the upper end of the rear linkage rod 51 is rotatably connected to the lower end of the handlebar rod 4, the lower end of the rear linkage rod 51 is rotatably connected to the rear end of the front linkage rod 6, the rear linkage rod 51 is rotatably connected to the lower end of the rear connecting rod 71 around the sixth axis A6, the upper end of the protruding rod 52 is rotatably connected to the upper part of the rear foot rod 2, and the lower end of the protruding rod 52 is fixedly connected to the lower part of the rear linkage rod 51.

[0022] As described above, the child stroller frame with a foldable rear wheel set further includes a locking structure 100 capable of locking the frame and an unlocking structure 200 capable of unlocking the locking structure 100 .

[0023] As described above, a child stroller frame with a foldable rear wheel group, the locking structure 100 includes a left shell 110 disposed at the lower part of the handlebar 4 and a right shell 120 disposed at the upper end of the support rod 3 and capable of rotating relative to the left shell 110, the left shell 110 and the right shell 120 enclose a cavity, the cavity is provided with a rotating block 130 capable of rotating therein and a spline 140 capable of moving laterally therein, the rotating block 130 has a plurality of inclined surfaces in a circumferential array. The protrusion 131 is provided on the spline 140, and a plurality of oblique grooves 141 are provided on the spline 140, which can cooperate with the oblique protrusion 131 and can drive the spline 140 to move laterally when the rotating block 130 rotates. The left shell 110 and the right shell 120 are provided with a slot 150 that can simultaneously engage with the spline 140. A spring 160 is provided between the spline 140 and the right shell 120 to reset the spline 140. A pull rope 170 is provided in the handlebar 4 for pulling the rotating block 130 to rotate.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. When the present invention is folded, the frame is first unlocked, and then the handlebar is operated to rotate upward and forward with the upper end of the support rod as the rotation axis, and then the handlebar is pressed down to link the support rod and rotate downward with the upper end of the rear foot rod as the rotation axis and move closer to the side of the rear foot rod, and the handlebar moves closer to the side of the support rod. At the same time, the handlebar is linked to the upper end of the rear linkage member to rotate with the connecting axis of the rear linkage member and the rear foot rod as the base axis, so that the upper end of the rear linkage member moves downward and moves closer to the lower end of the rear foot rod, and the lower end of the rear linkage member drives the rear end of the front linkage member to move upward and move closer to the upper end of the rear foot rod, then the lower end of the rear linkage member cooperates with the front linkage member to drive the front foot rod to rotate with the upper end of the rear foot rod as the rotation axis, so that the front foot rod rotates backward and moves closer to the side of the rear foot rod. At the same time, the lower part of the rear linkage member drives the linkage assembly to move upward relative to the rear foot rod, so that the linkage assembly can pull the rear wheel group to rotate and fold to the inside of the rear foot rod, thereby realizing the overall folding of the frame. After folding, the overall volume of the frame is minimized and can maintain a standing state. When unfolding, the operating handlebar drives the support rod to rotate backward and upward with the upper end of the rear foot rod as the rotation axis, and at the same time, the handlebar drives the upper end of the rear linkage member to rotate backward and upward with the connecting axis of the rear linkage member and the rear foot rod as the rotation axis. During the movement of the rear linkage member, the lower end of the rear linkage member rotates forward and downward with the connecting axis between the rear linkage member and the rear foot rod as the rotation axis, and the lower end of the rear linkage member cooperates with the front linkage member to make the front foot rod move away from the rear foot rod with the upper end of the rear foot rod as the rotation axis, that is, the front foot rod rotates forward relative to the rear foot rod to unfold. At the same time, the lower part of the rear linkage member drives the linkage assembly to move downward relative to the rear foot rod, and the linkage assembly drives the rear wheel group to unfold and reset, thereby realizing the overall unfolding of the frame, that is, realizing the effect of one-key folding or one-key unfolding of the child stroller frame, and at the same time, the folding efficiency is high and the structure is stable, which improves the use performance of the child stroller, and has the characteristics of high safety, strong practicality and reasonable design.

[0026] 2. After being folded, the rear wheel assembly of the present invention is rotated and folded toward the inside of the rear foot rod, so that the outer side surface of the wheel of the rear wheel assembly is arranged downward relative to the frame, that is, toward the support surface. Moreover, because the outer side surface of the wheel is arranged in a plane, when the frame is stored or transported, the outer side surface of the wheel of the rear wheel assembly is placed on the support surface, so that the frame can be stably placed on the support surface and remain standing. At the same time, the frame as a whole is placed upright along the length direction of the rear foot rod, which is convenient for users to place and take, and convenient for users to unfold and use the frame next time.

[0027] 3. A limiting groove is provided on the lower connecting seat, and an upper connecting seat is fixedly provided at the lower end of the rear foot rod. The upper connecting seat is formed with a limiting protrusion which can cooperate with the limiting groove to prevent the rear wheel group from rotating toward the outside of the rear foot rod when the rear wheel group is in the expanded state. When the rear wheel group is in the expanded state, it can ensure that the rear wheel group will not rotate outward relative to the rear foot rod, and has the characteristic of stable operation. At the same time, the limiting protrusion is clamped in the limiting groove, which can strengthen the structural strength of the connection between the rear wheel group and the rear foot rod.

[0028] 4. An upper limit block is fixedly connected to the upper connecting seat, and a lower limit block is fixedly connected to the lower connecting seat which can abut against the upper limit block when the rear wheel group is in the expanded state. The upper limit block and the lower limit block are made of metal materials, and the upper connecting seat and the lower connecting seat are made of plastic materials. The upper limit block and the lower limit block are made of metal materials, which can make the two of them directly rigidly contact, ensuring that the lower limit block and the upper limit block will not be fatigued and worn during the repeated expansion and retraction of the rear wheel group, ensuring that the rear wheel group will not be offset and misaligned relative to the rear foot rod, ensuring a stable connection, and at the same time, the abutment between the lower limit block and the upper limit block can further improve the structural strength between the rear wheel group and the rear foot rod, that is, improve the load-bearing performance of the frame, and the upper connecting seat and the lower connecting seat are made of plastic materials, which can reduce the manufacturing cost.

[0029] 5. The upper limit block is placed in the injection mold when the upper connecting seat is injection molded so that the two are an integral structure. Or the lower limit block is placed in the injection mold when the lower connecting seat is injection molded so that the two are an integral structure, which can reduce the disassembly and assembly steps and improve the structural strength.

[0030] 6. A fixing seat is fixedly connected to the rear foot rod, and a hole sleeve is provided on the fixing seat for the upper linkage rod to pass through and enable the upper linkage rod to slide and swing therein, thereby improving stability during the folding and unfolding process.

Brief Description of the Drawings

[0031] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0032] Figure 1 It is one of the structural schematic diagrams of the present invention in the unfolded state.

[0033] Figure 2 This is the second structural schematic diagram of the present invention in the unfolded state.

[0034] Figure 3 It is a side view of the present invention in the unfolded state.

[0035] Figure 4 It is a schematic structural diagram of the rear wheel assembly of the present invention.

[0036] Figure 5 It is a cross-sectional view of the rear wheel assembly of the present invention.

[0037] Figure 6 It is one of the exploded views of the rear wheel assembly of the present invention.

[0038] Figure 7 This is the second exploded view of the rear wheel assembly of the present invention.

[0039] Figure 8 This is one of the schematic diagrams of the folding process of the present invention when moving from an unfolded state to a folded state.

[0040] Fig. 9 This is the second schematic diagram of the folding process of the present invention when moving from the unfolded state to the folded state.

[0041] Fig.10 This is the third schematic diagram of the folding process of the present invention when moving from the unfolded state to the folded state.

[0042] Fig.11 It is a schematic diagram of folding completion when the present invention moves from an unfolded state to a folded state.

[0043] Fig.12 It is an exploded schematic diagram of the locking structure of the present invention.

[0044] Fig.13 It is a structural schematic diagram of the fixing seat of the present invention. [Specific implementation method]

[0045] The following is combined with Figure 1-13 Embodiments of the present invention are described in detail.

[0046] like Figure 1-13 As shown, a child stroller frame with a foldable rear wheel group of the present invention can be changed from an unfolded state to a folded state after unlocking the locking structure, comprising: a front foot rod 1, a rear foot rod 2, a support rod 3, a handlebar rod 4 and a rear linkage 5. The lower end of the front foot rod 1 is connected to the front wheel group 11. The lower end of the rear foot rod 2 is rotatably connected to the rear wheel group 21, and the upper end of the front foot rod 1 is rotatably connected to the upper end of the rear foot rod 2. The lower end of the support rod 3 is rotatably connected to the upper end of the front foot rod 1 or the upper end of the rear foot rod 2. The handlebar rod 4 is rotatably connected to the upper end of the support rod 3 near its lower end. The upper end of the rear linkage 5 is rotatably connected to the lower end of the handlebar 4, and the lower part of the rear linkage 5 is rotatably connected to the rear foot rod 2. A front linkage rod 6 rotatably connected to the front foot rod 1 is provided between the lower end of the rear linkage 5 and the front foot rod 1. A linkage assembly 8 is provided between the rear linkage member 5 and the rear wheel assembly 21 , which can pull the rear wheel assembly 21 to rotate and fold toward the inside of the rear leg rod 2 when the frame is transformed from the unfolded state to the folded state.

[0047] When the present invention is folded, the frame is first unlocked, and then the handlebar is operated to rotate upward and forward with the upper end of the support rod as the rotation axis, and then the handlebar is pressed down to link the support rod to rotate downward with the upper end of the rear foot rod as the rotation axis and move closer to one side of the rear foot rod, and the handlebar moves closer to one side of the support rod. At the same time, the handlebar is linked to the upper end of the rear linkage member to rotate with the connecting axis of the rear linkage member and the rear foot rod as the base axis, so that the upper end of the rear linkage member moves downward and moves closer to the lower end of the rear foot rod, and the lower end of the rear linkage member drives the rear end of the front linkage member to move upward and move closer to the upper end of the rear foot rod, and then the lower end of the rear linkage member cooperates with the front linkage member to drive the front foot rod to rotate with the upper end of the rear foot rod as the rotation axis, so that the front foot rod rotates backward and moves closer to one side of the rear foot rod. At the same time, the lower part of the rear linkage member drives the linkage assembly to move upward relative to the rear foot rod, so that the linkage assembly can pull the rear wheel group to rotate and fold to the inner side of the rear foot rod, thereby realizing the overall folding of the frame, and the overall volume of the frame is small. When unfolding, the operating handlebar drives the support rod to rotate backward and upward with the upper end of the rear foot rod as the rotation axis, and at the same time, the handlebar drives the upper end of the rear linkage member to rotate backward and upward with the connecting axis of the rear linkage member and the rear foot rod as the rotation axis. During the movement of the rear linkage member, the lower end of the rear linkage member rotates forward and downward with the connecting axis between the rear linkage member and the rear foot rod as the rotation axis, and the lower end of the rear linkage member cooperates with the front linkage member to make the front foot rod move away from the rear foot rod with the upper end of the rear foot rod as the rotation axis, that is, the front foot rod rotates forward relative to the rear foot rod to unfold. At the same time, the lower part of the rear linkage member drives the linkage assembly to move downward relative to the rear foot rod, and the linkage assembly drives the rear wheel group to unfold and reset, thereby realizing the overall unfolding of the frame, that is, realizing the effect of one-key folding or one-key unfolding of the child stroller frame, and at the same time, the folding efficiency is high and the structure is stable, which improves the use performance of the child stroller, and has the characteristics of high safety, strong practicality and reasonable design.

[0048] After the bicycle frame is folded, the rear wheel assembly is rotated and folded toward the inner side of the rear foot rod, so that the outer side surface of the wheel of the rear wheel assembly is arranged downward relative to the bicycle frame, that is, toward the support surface. Moreover, because the outer side surface of the wheel is arranged in a plane, when the bicycle frame is stored or transported, the outer side surface of the wheel of the rear wheel assembly is placed on the support surface, so that the bicycle frame can be stably placed on the support surface and maintain a standing state. At the same time, the bicycle frame as a whole is placed upright along the length direction of the rear foot rod, which is convenient for users to place and take, and convenient for users to unfold and use the bicycle frame next time.

[0049] like Figure 1-11As shown, the rear wheel assembly 21 includes a lower connecting seat 211 and a wheel 212 rotatably connected to the lower connecting seat 211, and the upper end of the lower connecting seat 211 is rotatably connected to the lower end of the rear foot rod 2 around the first axis A1. The linkage assembly 8 includes an upper linkage rod 81, a middle linkage block 82 and a lower linkage block 83, the upper end of the upper linkage rod 81 is rotatably connected to the rear linkage member 5 around the second axis A2, the lower end of the upper linkage rod 81 is rotatably connected to the upper end of the middle linkage block 82 around the third axis A3, the lower end of the middle linkage block 82 is rotatably connected to the upper end of the lower linkage block 83 around the fourth axis A4, and the lower end of the lower linkage block 83 is rotatably connected to the lower connecting seat 211 around the fifth axis A5. When the frame is folded, the lower part of the rear linkage 5 drives the upper linkage rod 81 to move upward relative to the rear foot rod 2. During this movement, the upper linkage rod 81 cooperates with the middle linkage block 82 and the lower linkage block 83 to make the lower connecting seat 211 rotate around the first axis A1 to pull the rear wheel group 21 to rotate toward the inside of the rear foot rod 2 to fold.

[0050] like Figure 1-11 As shown, the lower connecting seat 211 has a limiting groove 2111. The lower end of the rear foot rod 2 is fixedly provided with an upper connecting seat 22, and the upper connecting seat 22 is formed with a limiting protrusion 221 that can cooperate with the limiting groove 2111 to prevent the rear wheel group 21 from rotating outward from the rear foot rod 2 when the rear wheel group 21 is in the unfolded state. When the rear wheel group is in the unfolded state, it can ensure that the rear wheel group will not rotate outward relative to the rear foot rod, and the operation is stable. At the same time, the limiting protrusion is clamped in the limiting groove, which can strengthen the structural strength of the connection between the rear wheel group and the rear foot rod.

[0051] like Figure 1-11 As shown, the upper connecting seat 22 is fixedly connected with an upper limit block 222, and the lower connecting seat 211 is fixedly connected with a lower limit block 2112 that can abut against the upper limit block 222 when the rear wheel group 21 is in the unfolded state. The upper limit block 222 and the lower limit block 2112 are made of metal materials, and the upper connecting seat 22 and the lower connecting seat 211 are made of plastic materials. The lower end of the lower linkage block 83 is rotatably connected with the lower limit block 2112 around the fifth axis A5. In this embodiment, the upper limit block and the lower limit block are made of metal materials, which can make the two directly rigidly contact, ensure that the lower limit block and the upper limit block will not be fatigued and worn during the repeated unfolding of the rear wheel group, ensure that the rear wheel group will not be offset and misaligned relative to the rear foot rod, and the connection is stable. At the same time, the lower limit block and the upper limit block abut against each other, which can further improve the structural strength between the rear wheel group and the rear foot rod, that is, improve the load-bearing performance of the frame, and the upper connecting seat and the lower connecting seat are made of plastic materials, which can reduce the manufacturing cost.

[0052] Furthermore, the upper limit block 222 is placed in the injection mold when the upper connecting seat 22 is injection molded so that the two are an integral structure. Or the lower limit block 2112 is placed in the injection mold when the lower connecting seat 211 is injection molded so that the two are an integral structure, which can reduce the assembly steps and improve the structural strength during disassembly and assembly.

[0053] like Figure 1-11 As shown in Figures 13, a fixing seat 23 is fixedly connected to the rear foot rod 2. The fixing seat 23 is provided with a hole sleeve 231 for the upper linkage rod 81 to pass through and enable the upper linkage rod 81 to slide and swing therein, which can prevent the upper linkage rod 81 from swinging too much relative to the rear foot rod 2, causing a jamming phenomenon between the upper linkage rod and the middle linkage block. At the same time, the hole sleeve 231 can also limit the swing range of the upper linkage rod 81, that is, to ensure that the rear linkage member 5 rotates within the set rotation range, thereby improving the folding or unfolding efficiency and stability.

[0054] like Figure 1-11 As shown, in order to improve the structural strength, a reinforcing rod 24 is provided between the two rear leg rods 2 , with one end connected to one rear leg rod 2 and the other end connected to the other rear leg rod 2 .

[0055] like Figure 1-11 As shown, the frame also includes a seat support 7, the front side of the seat support 7 is rotatably connected to the support rod 3 and close to the lower end of the support rod 3, and a rear connecting rod 71 is rotatably connected to the rear side of the seat support 7 and the rear linkage 5. During the folding process, the upper part of the rear linkage 5 cooperates with the rear connecting rod 71 to fold or unfold the seat support 7, which improves the problem of the traditional need to disassemble the seat support 7 to fold or unfold the frame.

[0056] Furthermore, the front side of the seat support 7 has a front connecting rod 72, and the upper end of the front connecting rod 72 is rotatably connected to the support rod 3 and close to the lower end of the support rod 3. When folding, the front side of the seat support 7 is rotatably connected to the lower end of the support rod 3 through the front connecting rod 72, so that the seat support 7 can be folded into the space between the two rear foot rods 2, that is, the seat support 7 is horizontal with the rear foot rods 2, so that the overall volume of the frame after folding is smaller.

[0057] like Figure 1-11As shown, the rear linkage 5 includes a rear linkage rod 51 and a protruding rod 52, the upper end of the rear linkage rod 51 is rotatably connected to the lower end of the handlebar rod 4, the lower end of the rear linkage rod 51 is rotatably connected to the rear end of the front linkage rod 6, the rear linkage rod 51 is rotatably connected to the lower end of the rear link rod 71 around the sixth axis A6, the upper end of the protruding rod 52 is rotatably connected to the upper part of the rear foot rod 2, and the lower end of the protruding rod 52 is fixedly connected to the lower part of the rear linkage rod 51. The rear linkage rod 51 in this embodiment is rotatably connected to the rear foot rod 2 through the protruding rod 52, and when folded, the upper end of the rear linkage rod 51 and the lower end of the rear foot rod 2 can be brought closer together, and the lower end of the rear linkage rod 51 and the upper end of the rear foot rod 2 can be brought closer together, so that the support rod 3 is brought closer to the side of the rear foot rod 2, so that the overall volume of the frame is smaller after folding. At the same time, the protruding rod 52 can rotate and deviate relative to the rear foot rod 2 according to the transformation process when the frame is folded or unfolded, that is, the rear linkage rod 51 can deviate relative to the rear foot rod 2, making the folding or unfolding of the frame more flexible and convenient.

[0058] like Figure 1-12 As shown, the frame also includes a locking structure 100 capable of locking the frame and an unlocking structure 200 capable of unlocking the locking structure 100, which can ensure that when the frame is in an unfolded state or a folded state, the frame is always locked by the locking structure to prevent the frame from being folded or unfolded accordingly, thereby achieving high safety.

[0059] like Figure 1-12As shown, the locking structure 100 includes a left shell 110 arranged at the lower part of the handlebar rod 4 and a right shell 120 arranged at the upper end of the support rod 3 and rotatable relative to the left shell 110, the left shell 110 and the right shell 120 surround a cavity, and a rotating block 130 that can rotate therein and a spline 140 that can move laterally therein are provided in the cavity, and a circular array of a plurality of inclined protrusions 131 with inclined surfaces are provided on the rotating block 130, and a plurality of inclined grooves 141 that can cooperate with the inclined protrusions 131 and can drive the spline 140 to move laterally when the rotating block 130 rotates are provided on the spline 140, and a card slot 150 that can be simultaneously engaged with the spline 140 is provided on the left shell 110 and the right shell 120, and a spring 160 for resetting the spline 140 is provided between the spline 140 and the right shell 120, and a pull rope 170 for pulling the rotating block 130 to rotate is provided in the handlebar rod 4. The unlocking structure 200 is an unlocking part provided on the handlebar 4 and connected to the rotating block 130 through the pull rope 170. When unlocking, the user operates the unlocking part and drives the rotating block 130 to rotate through the pull rope 170, so that the inclined protrusion 131 on the rotating block 130 cooperates with the inclined groove 141 on the spline 140 for guiding cooperation, so that the spline 140 moves laterally in the cavity and toward the right housing 120 side, that is, the spline 140 is disengaged from the card slot 150 of the left housing 110, and the spring 160 is compressed. At this time, the right housing 120 can rotate relative to the left housing 110, thereby unlocking the locking structure 100, that is, unlocking the frame.

[0060] Working principle:

[0061] When folding, the user operates the unlocking part and drives the rotating block 130 to rotate through the pull rope 170, so that the inclined protrusion 131 on the rotating block 130 cooperates with the inclined groove 141 on the spline 140 to guide and cooperate, so that the spline 140 moves laterally in the cavity and toward the right shell 120 side, that is, the spline 140 is disengaged from the slot 150 of the left shell 110, and the spring 160 is compressed. At this time, the right shell 120 can rotate relative to the left shell 110, that is, the support rod 3 and the handlebar rod 4 rotate relative to each other, thereby unlocking the frame.

[0062] Then the user operates the handlebar 4 to turn forward and upward with the rear foot bar 2 as the reference, and then presses the handlebar 4 downward. In this process, the handlebar 4 drives the support bar 3 to rotate backward and downward with the upper end of the rear foot bar 2 as the base point, and move closer to the side of the rear foot bar 2. The handlebar 4 moves closer to the side of the support bar 3 with the upper end of the support bar 3 as the base point. At the same time, the handlebar 4 links the upper end of the rear linkage rod 51 to rotate downward and forward with the connecting axis between the protruding rod 52 and the rear foot bar 2 as the base axis, so that the upper end of the rear linkage rod 51 moves closer to the lower end of the rear foot bar 2. At the same time, the rear linkage rod 51 cooperates with the rear connecting rod 71 to make the seat support 7 move downward and forward and move closer to the side of the rear foot bar 2, and the seat support 7 is folded into the space between the two rear foot bars 2. At the same time, the upper end of the rear linkage rod 51 drives the rear end of the front linkage rod 6 to rotate upward and backward with the connecting axis between the protruding rod 52 and the rear foot rod 2 as the base axis, and move closer to the upper end of the rear foot rod 2. During this process, the lower end of the rear linkage rod 51 cooperates with the front linkage rod 6 to make the front foot rod 1 move closer to the side of the rear foot rod 2. At the same time, the lower part of the rear linkage rod 51 drives the upper end of the upper linkage rod 81 to move forward and upward relative to the rear foot rod 2. During the movement of the upper linkage rod 81, the upper linkage rod 81 pulls the rear wheel assembly 21 to rotate and fold to the inside of the rear foot rod 2 with the first axis A1 as the rotation axis through the middle linkage block 82 and the lower linkage block 83. Thus, the folding and folding of the frame is completed.

[0063] When unfolding, the handlebar 4 is operated to move backward and upward with the rear foot bar 2 as the reference. In this process, the handlebar 4 drives the support bar 3 to rotate backward and upward with the upper end of the rear foot bar 2 as the rotation axis until the unfolded state. At the same time, the handlebar 4 drives the upper end of the rear linkage rod 51 to move backward and upward. In this process, the rear linkage rod 51 cooperates with the rear connecting rod 71 to rotate the seat support member 7 backward and upward to the unfolded state. The lower end of the rear linkage rod 51 drives the rear end of the front linkage rod 6 to move forward and downward, so that the front foot bar 1 moves forward with the upper end of the rear foot bar 2 as the rotation axis until the unfolded state. The lower part of the rear linkage rod 51 is linked with the upper linkage rod 81 to move downward relative to the rear foot bar 2. During the movement of the upper linkage rod 81, the upper linkage rod 81 drives the rear wheel group 21 to rotate to the outside of the rear foot bar 2 with the first axis A1 as the rotation axis until the unfolded state through the middle linkage block 82 and the lower linkage block 83.

[0064] Finally, the handlebar 4 is operated to flip backwards with the upper end of the support rod 3 as the rotation axis until the handlebar 4 and the rear linkage rod 51 are on the same axis. At this time, the spring 160 elastically resets and drives the spline 140 to reset to simultaneously engage the slots 170 of the left shell 110 and the right shell 120, that is, the left shell 110 and the right shell 120 are relatively locked, that is, the frame is locked, thereby achieving the effect of one-key folding or one-key unfolding of the child frame, while the folding efficiency is high and the structure is stable, thereby improving the performance of the child stroller, and the overall volume of the frame is smaller after folding.

Claims

1. A child stroller frame with a foldable rear wheel set, which can be transformed from an unfolded state to a folded state after unlocking a locking structure, characterized in that include: A front foot rod (1), the lower end of the front foot rod (1) being connected to a front wheel assembly (11); A rear foot rod (2), the lower end of the rear foot rod (2) being rotatably connected to a rear wheel assembly (21), and the upper end of the front foot rod (1) being rotatably connected to the upper end of the rear foot rod (2); A support rod (3), the lower end of the support rod (3) being rotatably connected to the upper end of the front foot rod (1) or the upper end of the rear foot rod (2); A handlebar (4), wherein the handlebar (4) is rotatably connected to the upper end of the support rod (3) at a position near the lower end thereof; A rear linkage member (5), wherein the upper end of the rear linkage member (5) is rotatably connected to the lower end of the handlebar (4), the lower part of the rear linkage member (5) is rotatably connected to the rear foot bar (2), and a front linkage member (6) rotatably connected to the lower end of the rear linkage member (5) and the front foot bar (1) is provided between the lower end of the rear linkage member (5); A linkage assembly (8) is provided between the rear linkage member (5) and the rear wheel assembly (21) and is capable of pulling the rear wheel assembly (21) to rotate and fold toward the inside of the rear foot rod (2) when the vehicle frame changes from an unfolded state to a folded state; The rear wheel assembly (21) comprises a lower connecting seat (211) and a wheel (212) rotatably connected to the lower connecting seat (211); the upper end of the lower connecting seat (211) is rotatably connected to the lower end of the rear foot rod (2) around a first axis (A1); the linkage assembly (8) comprises an upper linkage rod (81), a middle linkage block (82) and a lower linkage block (83); the upper end of the upper linkage rod (81) is rotatably connected to the rear linkage member (5) around a second axis (A2); the lower end of the upper linkage rod (81) is rotatably connected to the upper end of the middle linkage block (82) around a third axis (A3); the lower end of the middle linkage block (82) is rotatably connected to the upper end of the lower linkage block (83) around a fourth axis (A4); and the lower end of the lower linkage block (83) is rotatably connected to the lower connecting seat (211) around a fifth axis (A5); An upper connecting seat (22) is fixedly provided at the lower end of the rear foot rod (2), an upper limit block (222) is fixedly connected to the upper connecting seat (22), a lower limit block (2112) is fixedly connected to the lower connecting seat (211) and can abut against the upper limit block (222) when the rear wheel assembly (21) is in an unfolded state, and a lower end of the lower linkage block (83) is rotatably connected to the lower limit block (2112) around a fifth axis (A5); The child stroller frame also includes a locking structure (100) capable of locking the frame, and an unlocking structure (200) capable of unlocking the locking structure (100).

2. A child stroller frame with foldable rear wheels according to claim 1, characterized in that The lower connecting seat (211) is provided with a limiting groove (2111); the upper connecting seat (22) is formed with a limiting protrusion (221) which can cooperate with the limiting groove (2111) to prevent the rear wheel set (21) from rotating toward the outside of the rear foot rod (2) when the rear wheel set (21) is in an unfolded state.

3. A child stroller frame with foldable rear wheels according to claim 1, characterized in that The upper limit block (222) and the lower limit block (2112) are made of metal material, and the upper connecting seat (22) and the lower connecting seat (211) are made of plastic material.

4. A child stroller frame with foldable rear wheels according to claim 3, characterized in that The upper limit block (222) is placed in the injection mold when the upper connecting seat (22) is injection molded so that the two form an integral structure; or the lower limit block (2112) is placed in the injection mold when the lower connecting seat (211) is injection molded so that the two form an integral structure.

5. A child stroller frame with foldable rear wheels according to claim 1, characterized in that A fixing seat (23) is fixedly connected to the rear foot rod (2), and a hole sleeve (231) is provided on the fixing seat (23) for the upper linkage rod (81) to pass through and for enabling the upper linkage rod (81) to slide and swing therein.

6. A child stroller frame with foldable rear wheels according to any one of claims 1 to 5, characterized in that The frame further comprises a seat support member (7), the front side of the seat support member (7) being rotatably connected to the support rod (3) and close to the lower end of the support rod (3), and a rear connecting rod (71) being rotatably connected to the rear link member (5) and the rear side of the seat support member (7).

7. A child stroller frame with foldable rear wheels according to claim 6, characterized in that The front side of the seat support (7) is provided with a front connecting rod (72), and the upper end of the front connecting rod (72) is rotatably connected to the support rod (3) and close to the lower end of the support rod (3).

8. A child stroller frame with foldable rear wheels according to claim 7, characterized in that The rear linkage member (5) comprises a rear linkage rod (51) and a protruding rod (52); the upper end of the rear linkage rod (51) is rotatably connected to the lower end of the handlebar rod (4); the lower end of the rear linkage rod (51) is rotatably connected to the rear end of the front linkage rod (6); the rear linkage rod (51) is rotatably connected to the lower end of the rear link rod (71) around a sixth axis (A6); the upper end of the protruding rod (52) is rotatably connected to the upper part of the rear foot rod (2); and the lower end of the protruding rod (52) is fixedly connected to the lower part of the rear linkage rod (51).

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