Baby carriage frame reliable to use

Abstract

The utility model discloses a reliable-to-use buggy frame which is characterized in that a folding angle control mechanism is used for stopping a front foot rod from continuously rotating towards one side of a rear foot rod when the front foot rod rotates and is folded to a preset angle relative to the rear foot rod, so that the front foot rod keeps an opening angle relative to the rear foot rod; according to the utility model, the phenomena of rollover, toppling and the like caused by unstable position of the frame due to the fact that the distance between the front foot rod and the rear foot rod is too small in the folding process of the frame can be effectively avoided, so that the frame can be effectively ensured to be stably in a standing use state, and a user can lift and use the frame conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of children's travel products, in particular to a reliable children's car frame.

Background Art

[0002] Children's cars have become an indispensable product in the growth process of infants and young children. Many children's cars on the market currently include a foldable children's car frame and a foldable children's seat connected to the children's car frame.

[0003] Currently, during the folding process of the children's car frame, usually the front foot rod rotates towards the rear foot rod side and closes so that the overall folded children's car frame is in a standing placement state for the user to lift, that is, the lower ends of the front foot rod and the rear foot rod simultaneously contact the ground. However, nowadays, due to the influence of the design structure and subsequent packaging and transportation requirements of the children's car frame, the front foot rod needs to be kept close to the rear foot rod, resulting in a small angle between the front foot rod and the rear foot rod. As a result, when the handle is lifted to unfold the children's car frame in the standing placement state, it is prone to tipping forward, affecting the unfolding and use, and bringing inconvenience to the user.

[0004] In addition, for the convenience of pushing and using the children's car frame on the market, the front wheel set is usually a universal wheel and the rear wheel set is usually a directional wheel. Since the front wheel set can rotate relative to the front foot rod, when the children's car frame is folded, it is easy to cause interference during the folding process of the front wheel set and the rear wheel set approaching each other, affecting the smooth folding, and there is a problem of inconvenient folding; also, after the folding is completed, due to the rotational uncertainty of the front wheel set, it will also affect whether the whole vehicle can be folded to the minimum volume.

[0005] Therefore, the present utility model is studied and proposed in view of the above problems.

Content of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a reliable children's car frame. When the front foot rod rotates and folds relative to the rear foot rod to a preset angle, the folding angle control mechanism blocks the front foot rod from continuing to fold towards the rear foot rod side, so that the front foot rod and the rear foot rod maintain an opening angle, which can effectively prevent the distance between the front foot rod and the rear foot rod from being too small during the standing process of the folded frame, resulting in the frame standing unstable and tipping over. Therefore, using the present utility model can effectively ensure that the frame is in a stable standing folding and using state, facilitating the user to lift and use.

[0007] The present utility model is realized through the following technical solutions:

[0008] A reliable children's car frame that can be switched between an unfolded use state and a folded use state, including:

[0009] A front foot rod 1, the lower end of which is connected to a front wheel set 11;

[0010] A rear foot rod 2, wherein the rear foot rod 2 is rotatably connected to the front foot rod 1, and a rear wheel set 21 is connected to the lower end of the rear foot rod 2;

[0011] A push rod 3, the lower end of which is rotatably connected to the front foot rod 1 or the rear foot rod 2;

[0012] A folding angle control mechanism 4, the folding angle control mechanism 4 is located between the front foot bar 1 and the rear foot bar 2, and the folding angle control mechanism 4 is configured to prevent the front foot bar 1 from further folding toward the rear foot bar 2 when the front foot bar 1 rotates and folds relative to the rear foot bar 2 to a preset angle, so that the front foot bar 1 maintains an open angle relative to the rear foot bar 2 to ensure that the frame is stably in a standing folded state, and to prevent the frame from tipping over during the initial action of switching from the folded state to the unfolded state;

[0013] A linkage mechanism 5, the linkage mechanism 5 is located between the front foot rod 1, the rear foot rod 2 and the push rod 3, and the linkage mechanism 5 is configured to link the front foot rod 1 with the rear foot rod 2 so that it is folded or unfolded accordingly when the push rod 3 rotates relative to the rear foot rod 2;

[0014] A frame locking mechanism, the frame locking mechanism is located between the rear foot rod 2 and the push rod 3 and is used to lock the frame in an unfolded use state;

[0015] The frame unlocking mechanism is located on the rear foot rod 2 or the push rod 3 and is used to link the unlocking action of the frame locking mechanism to release the locked state of the frame.

[0016] As described above, the frame of the child bicycle is reliable to use, and the folding angle control mechanism 4 is also configured to release the obstruction of the front leg rod 1, so that the front leg rod 1 can be further rotated and folded toward the side of the rear leg rod 2 so that the frame is in a fully folded state for use.

[0017] As described above, a reliable children's car frame is provided, wherein a rear connecting rod 22 is provided between the upper parts of the two rear leg rods 2, and a front connecting seat 23 rotatably connected to the upper end of the front leg rod 1 is provided on the rear connecting rod 22; the folding angle control mechanism 4 is located between the front leg rod 1 and the rear connecting rod 22.

[0018] As described above, a reliable children's vehicle frame is provided, wherein the folding angle control mechanism 4 includes an angle control mounting seat 41 arranged on the front foot rod 1 or the rear connecting rod 22, and the angle control mounting seat 41 is movably provided with an angle control blocking member 42 for blocking the front foot rod 1 from continuing to fold toward the rear foot rod 2 when the front foot rod 1 is rotated relative to the rear foot rod 2 to be folded to a preset angle, and an angle control resetting member for driving the angle control blocking member 42 to elastically return to its original position is provided between the angle control blocking member 42 and the angle control mounting seat 41.

[0019] As described above, a reliable children's vehicle frame is provided, wherein the angle control blocking member 42 is slidably disposed on the angle control mounting seat 41, and the angle control blocking member 42 has an angle control blocking portion 421 for blocking and cooperating with the corresponding front foot rod 1 or rear foot rod 2 and an angle control avoiding portion 422 for avoiding the corresponding front foot rod 1 or rear foot rod 2.

[0020] As described above, a reliable children's vehicle frame is provided, wherein the linkage mechanism 5 includes a first linkage member 51, a second linkage member 52 and a third linkage member 53, wherein the upper end of the first linkage member 51 is rotatably connected to the lower portion of the push rod 3, the lower end of the first linkage member 51 is rotatably connected to an extended connection end 521 raised in the middle portion of the second linkage member 52, the rear end of the second linkage member 52 is rotatably connected to the upper portion of the rear foot rod 2, the front end of the second linkage member 52 is rotatably connected to the rear end of the third linkage member 53, and the front end of the third linkage member 53 is rotatably connected to the upper portion of the front foot rod 1.

[0021] As described above, in the reliable use of the children's bicycle frame, the front wheel set 11, the rear wheel set 21 and the upper end of the push rod 3 are configured to be supported on the support surface at the same time when the frame is in the standing folded use state.

[0022] As described above, a reliable children's bicycle frame is provided, wherein the push rod 3 is connected with a handrail 8 which can be linked by a linkage mechanism 5, and the handrail 8 is configured to be linked and flipped to an upward state when the frame is in a standing folded state for use, so as to facilitate the user to lift it.

[0023] As described above, a reliable baby stroller frame is provided, wherein the armrest rod 8 comprises an armrest seat 81 hinged to the push rod 3 and an armrest portion 82 connected to the armrest seat 81 , and the lower end of the armrest seat 81 is connected to the linkage mechanism 5 .

[0024] As described above, there is a reliable child's bicycle frame. The lower end of the front foot rod 1 is pivotally connected to a front wheel set 11 that can rotate relative to the front foot rod 1 about the central axis of the pivot. A front wheel locking mechanism 6 is provided between the front wheel set 11 and the lower end of the front foot rod 1 for locking the front wheel set 11 relative to the front foot rod 1 to limit the rotation of the front wheel set 11 about the central axis of the pivot. The frame is also provided with a front wheel linkage mechanism 7 that, when the frame is being folded, is used to link the action of the front wheel locking mechanism 6 to lock the front wheel set 11 relative to the front foot rod 1, thereby making the front wheel set 11 and the rear wheel set 21 parallel to each other.

[0025] As described above, there is a reliable child's bicycle frame. The front wheel locking mechanism 6 is configured to be unlocked from locking the front wheel set 11 by the linkage of the front wheel linkage mechanism 7 when the frame is in the unfolded and in-use state.

[0026] As described above, there is a reliable child's bicycle frame. The front wheel locking mechanism 6 includes a front wheel lock hole 61 eccentrically provided on the front wheel connection seat 111 of the front wheel set 11 and a front wheel lock pin 62 movably provided at the lower end of the front foot rod 1 and capable of elastically inserting into the front wheel lock hole 61. A lock pin elastic member 63 is provided between the front wheel lock pin 62 and the front foot rod 1 for driving the front wheel lock pin 62 to elastically reset. The front wheel lock pin 62 is configured to be linked by the front wheel linkage mechanism 7 during the folding process of the frame.

[0027] As described above, there is a reliable child's bicycle frame. A rear connecting rod 22 is provided between the upper parts of the two rear foot rods 2. A front connecting seat 23 that is rotatably connected to the upper end of the front foot rod 1 is provided on the rear connecting rod 22. A front wheel linkage mechanism 7 for linking the corresponding movement of the front wheel lock pin 62 is provided between the front connecting seat 23 and the front foot rod 1. The front wheel linkage mechanism 7 includes a front wheel sliding member 71 slidably provided on the front foot rod 1. The front wheel sliding member 71 and the front wheel lock pin 62 are connected by a front wheel linkage member 72. The front wheel linkage mechanism 7 further includes a front wheel locking drive member 73 provided on the front connecting seat 23. A front wheel drive portion 731 is provided on the front wheel locking drive member 73 for linking the corresponding sliding of the front wheel sliding member 71 during the corresponding rotation of the front foot rod 1 relative to the rear foot rod 2, thereby making the front wheel lock pin 62 insert into or withdraw from the front wheel lock hole 61.

[0028] As described above, there is a reliable child's bicycle frame. It further includes a seat frame 9. The seat frame 9 includes a rear seat portion 91 fixedly connected to the lower end of the push rod 3. The front side of the rear seat portion 91 is rotatably connected to a front seat portion 92. The front seat portion 92 and the front foot rod 1 are connected by a seat support rod 93. The upper end of the seat support rod 93 is rotatably connected to the front part of the front seat portion 92, and the lower end of the seat support rod 93 is rotatably connected to the upper part of the front foot rod 1.

[0029] Compared with the prior art, the present utility model has the following advantages:

[0030] 1. When the front foot bar rotates and folds relative to the rear foot bar to a preset angle, the folding angle control mechanism of the present utility model blocks the further folding of the front foot bar towards the rear foot bar side, so that the front foot bar and the rear foot bar maintain an opening angle relative to each other. This can effectively prevent the distance between the front foot bar and the rear foot bar from being too small during the standing process of the folded frame, which may cause the frame to stand unsteadily and tip over or fall. Therefore, using the present utility model can effectively ensure that the frame is in a stable standing and folded state for use, which is convenient for the user to lift and use. At the same time, since the folding angle control mechanism makes the front foot bar and the rear foot bar maintain an opening angle relative to each other, when the frame switches from the folded state for use to the unfolded state for use, the initial movement can effectively prevent the frame from tipping over, and it is also convenient for the front foot bar to rotate forward relative to the rear foot bar and unfold smoothly, with reliable and convenient use.

[0031] 2. In order to make the volume of the folded frame smaller and facilitate subsequent packaging, handling and other operations, the folding angle control mechanism is also configured to release the block on the front foot bar, allowing the front foot bar to further rotate and fold towards the rear foot bar side so that the frame is in a fully folded state for use.

[0032] 3. For convenient use and to ensure the structural stability of the frame, the linkage mechanism is configured to link the corresponding closing and folding or unfolding of the front foot bar relative to the rear foot bar when the push rod rotates relative to the rear foot bar. That is, only by controlling the rotation and folding or rotation and unfolding of the push rod relative to the rear foot bar can the corresponding linkage control the rotation and folding or rotation and unfolding of the front foot bar relative to the rear foot bar. In other words, only one operation action can be used to make the frame rotate and fold or rotate and unfold, with simple and convenient operation.

[0033] 4. The present utility model only needs a set of frame locking mechanisms and linkage mechanisms to cooperate to lock the whole frame, and at the same time, only by operating a set of frame unlocking mechanisms can the whole frame be unlocked, with convenient operation and reasonable design.

[0034] 5. The present utility model locks the front wheel set relative to the front foot bar through the front wheel locking mechanism to limit the rotation of the front wheel set around the pivot center axis, which can avoid the interference between the front wheel set and the rear wheel set or other parts of the frame during the folding process of the frame, is beneficial to the smooth folding of the frame, and has the characteristic of convenient folding. At the same time, it can ensure that the whole vehicle in the folded state for use is completely folded, which is convenient for carrying and storing.

[0035] 6. In order to ensure that the frame stands more stably, the front wheel set, the rear wheel set and the upper end of the push rod are configured to support on the support surface simultaneously when the frame is in the standing and folded state for use.

[0036] 7. For the convenience of the user to lift, an armrest bar that can be linked by the linkage mechanism is connected to the push rod. The armrest bar is configured to be linked and flipped upwards when the frame is in the standing and folded state for use to facilitate the user to lift.

Description of the Drawings

[0037] The following further elaborates on the specific implementation manners of the present utility model in conjunction with the drawings, where:

[0038] Figure 1 is one of the perspective views of the present utility model in the deployed and in-use state.

[0039] Figure 2 is another perspective view of the present utility model in the deployed and in-use state.

[0040] Figure 3 is the third perspective view of the present utility model in the deployed and in-use state.

[0041] Figure 4 is the side view of the present utility model in the deployed and in-use state.

[0042] Figure 5 is the perspective view of the present utility model in the standing and folded and in-use state.

[0043] Figure 6 is the side view of the present utility model in the standing and folded and in-use state.

[0044] Figure 7 is the side view of the present utility model in the fully folded and in-use state.

[0045] Figure 8 is the structural schematic diagram of the folding angle control mechanism in the present utility model.

[0046] Figure 9 is the cross-sectional view of the front wheel locking mechanism in the present utility model.

[0047] Figure 10 is the structural schematic diagram of the front wheel unlocking mechanism in the present utility model.

[0048] Figure 11 is the exploded view of the front wheel unlocking mechanism in the present utility model.

Specific Implementation Manner

[0049] The following elaborates on the implementation manner of the present utility model in detail in conjunction with the drawings.

[0050] As Figures 1-11 shown, a reliable-to-use child bicycle frame of the present utility model, the frame can be switched between a deployed and in-use state and a folded and in-use state, and includes:

[0051] A front foot rod 1, a front wheel set 11 is connected to the lower end of the front foot rod 1;

[0052] A rear foot rod 2, the rear foot rod 2 is rotatably connected to the front foot rod 1, and a rear wheel set 21 is connected to the lower end of the rear foot rod 2;

[0053] A push rod 3, the lower end of the push rod 3 is rotatably connected to the front foot rod 1 or the rear foot rod 2;

[0054] A folding angle control mechanism 4, the folding angle control mechanism 4 is located between the front foot rod 1 and the rear foot rod 2, and the folding angle control mechanism 4 is configured to block the front foot rod 1 from continuing to fold towards the rear foot rod 2 when the front foot rod 1 rotates relative to the rear foot rod 2 to a preset angle, so that the front foot rod 1 and the rear foot rod 2 maintain an opening angle relative to each other to ensure that the vehicle frame is stably in a standing folding use state, and to avoid tipping when the vehicle frame switches from the folding use state to the initial action of the unfolding use state;

[0055] A linkage mechanism 5, the linkage mechanism 5 is located between the front foot rod 1, the rear foot rod 2 and the push rod 3, and the linkage mechanism 5 is configured to drive the front foot rod 1 to fold or unfold correspondingly relative to the rear foot rod 2 when the push rod 3 rotates relative to the rear foot rod 2;

[0056] A vehicle frame locking mechanism, the vehicle frame locking mechanism is located between the rear foot rod 2 and the push rod 3 for locking the vehicle frame in the unfolded use state;

[0057] A vehicle frame unlocking mechanism, the vehicle frame unlocking mechanism is located on the rear foot rod 2 or the push rod 3 for driving the unlocking action of the vehicle frame locking mechanism, thereby unlocking the locked state of the vehicle frame. By means of the folding angle control mechanism of the present invention, when the front foot rod rotates relative to the rear foot rod to a preset angle during folding, the front foot rod is blocked from continuing to fold towards the rear foot rod, so that the front foot rod and the rear foot rod maintain an opening angle relative to each other, which can effectively avoid the phenomenon of the vehicle frame standing unstable and tipping over due to the too small distance between the front foot rod and the rear foot rod during the folding and standing process of the vehicle frame. Therefore, the use of the present invention can effectively ensure that the vehicle frame is in a stable standing folding use state, which is convenient for the user to lift and use; at the same time, since the folding angle control mechanism makes the front foot rod and the rear foot rod maintain an opening angle relative to each other, the vehicle frame can be effectively avoided from tipping over when the vehicle frame switches from the folding use state to the initial action of the unfolding use state, and it is also convenient for the front foot rod to rotate forward relative to the rear foot rod and unfold smoothly, and the use is reliable and convenient.

[0058] The present invention can realize the functions of one-key stable folding and standing and stable and smooth unfolding.

[0059] Furthermore, through the folding angle control mechanism, the whole vehicle can be kept standing and not tipping over when folding, and can be further folded to minimize the folding volume of the whole vehicle for packaging and transportation, outdoor carrying, and storage when not in use.

[0060] In the present utility model, the frame locking mechanism is used to lock the push rod relative to the rear foot rod. The frame unlocking mechanism is arranged on the push rod. For the structure of the frame locking mechanism, reference can be made to the frame locking mechanism of a folding-convenient baby carriage with the application number 202321203527.5, etc. For the structure of the frame unlocking mechanism, reference can be made to the handle unlocking mechanism of a folding-convenient baby stroller frame with the application number 202323413075.6, etc.

[0061] In order to minimize the volume of the frame after folding and facilitate subsequent operations such as packaging and handling, the folding angle control mechanism 4 is further configured to release the block on the front foot rod 1, so that the front foot rod 1 can be further rotated and folded towards the rear foot rod 2 side, making the frame in a fully folded state for use. When it is necessary to package and handle the frame, the user operates the folding angle control mechanism 4 to misalign the angle control blocking part 421 with the front foot rod, that is, the angle control blocking part 421 releases the block on the front foot rod. Then, the user operates the front foot rod to continue rotating and folding towards the rear foot rod side until the front foot rod and the rear foot rod are close to each other, making the frame in a fully folded state for use.

[0062] As Figures 1-7 shown, in order to improve the structural strength and stability between the two rear foot rods, a rear connecting rod 22 is provided between the upper parts of the two rear foot rods 2. A front connecting seat 23 that can be rotatably connected to the upper end of the front foot rod 1 is provided on the rear connecting rod 22; the folding angle control mechanism 4 is located between the front foot rod 1 and the rear connecting rod 22. As Figure 3 shown, the upper ends of the two front foot rods 1 are connected by a front connecting rod to form a U-shaped connection structure, which can also improve its structural strength, thereby ensuring the overall stability and reliability of the frame.

[0063] As Figure 2 shown, a lower connecting rod is provided between the lower parts of the two rear foot rods 2.

[0064] As Figure 1 、 3 、5、8 shown, in order to reliably block the front foot rod to ensure that the front foot rod opens relative to the rear foot rod, the folding angle control mechanism 4 includes an angle control mounting seat 41 provided on the front foot rod 1 or the rear connecting rod 22. An angle control blocking member 42 for blocking the front foot rod 1 from continuing to fold towards the rear foot rod 2 side when the front foot rod 1 rotates and folds relative to the rear foot rod 2 to a preset angle is movably provided on the angle control mounting seat 41. An angle control reset member for driving the angle control blocking member 42 to elastically reset is provided between the angle control blocking member 42 and the angle control mounting seat 41. In this embodiment, the angle control reset member can be a compression spring or a spring to ensure that the angle control blocking member 42 remains in the extended blocking state, as Figure 7 shown.

[0065] As Figure 1 、3 As shown in FIGS. 5 and 8, the angle control blocking member 42 is slidably provided on the angle control mounting seat 41. The angle control blocking member 42 has an angle control blocking portion 421 for blocking and cooperating with the corresponding front foot rod 1 or rear foot rod 2, and an angle control avoiding portion 422 for avoiding the corresponding front foot rod 1 or rear foot rod 2. When it is necessary to package and carry the vehicle frame, the user presses the angle control blocking member 42 to retract the angle control blocking member 42 into the angle control mounting seat 41, so that the angle control blocking portion 421 is misaligned with the front foot rod, and the angle control avoiding portion 422 cooperates with the front foot rod. Then, by operating the front foot rod to rotate and approach the rear foot rod side, the vehicle frame can be in a fully folded storage and use state. At this moment, the side wall of the front foot rod blocks and cooperates with the corresponding end wall of the angle control blocking member 42 to prevent the angle control blocking member 42 from elastically protruding, avoiding interference.

[0066] In some other embodiments, the angle control blocking member 42 is rotatably provided on the angle control mounting seat 41.

[0067] As Figures 1-7 shown, in order to make the linkage more reliable and efficient, the linkage mechanism 5 includes a first linkage member 51, a second linkage member 52 and a third linkage member 53. The upper end of the first linkage member 51 is rotatably connected to the lower part of the push rod 3, the lower end of the first linkage member 51 is rotatably connected to the extended connection end 521 protruding from the middle of the second linkage member 52, the rear end of the second linkage member 52 is rotatably connected to the upper part of the rear foot rod 2, the front end of the second linkage member 52 is rotatably connected to the rear end of the third linkage member 53, and the front end of the third linkage member 53 is rotatably connected to the upper part of the front foot rod 1. When folding, the push rod rotates downward relative to the rear foot rod. Then, the push rod drives the second linkage member 52 to rotate downward around the rotation axis between the rear end of the second linkage member 52 and the upper part of the rear foot rod 2 through the first linkage member 51. The front end of the second linkage member 52 pulls the front foot rod to rotate and approach the rear foot rod side through the third linkage member 53 for folding, which is convenient and reliable for folding.

[0068] As Figure 6 shown, in order to make the vehicle frame stand more stably, the front wheel set 11, the rear wheel set 21 and the upper end of the push rod 3 are configured to be simultaneously supported on the support surface when the vehicle frame is in a standing storage and use state. In this embodiment, by correspondingly supporting the front wheel set 11 and the upper end of the push rod 3 on the support surface, it can effectively prevent the vehicle frame in the standing storage and use state from tipping forward or backward, ensuring the stable standing of the vehicle frame.

[0069] As Figure 5 、 6 shown, in order to facilitate lifting, a handrail rod 8 that can be linked by the linkage mechanism 5 is connected to the push rod 3. The handrail rod 8 is configured to be linked and flipped upward when the vehicle frame is in a standing storage and use state for the user to lift conveniently.

[0070] Further, the armrest rod 8 includes an armrest seat 81 hinged to the push rod 3 and an armrest portion 82 connected to the armrest seat 81. The lower end of the armrest seat 81 is connected to the linkage mechanism 5. In this embodiment, the lower end of the armrest seat 81 is connected to the upper end of the first linkage member 51 to move correspondingly with the movement of the first linkage member 51.

[0071] For the convenience of subsequent packaging, transportation, etc., the armrest portion 82 is detachably connected to the armrest seat 81, so that the armrest portion 82 can be detached from the armrest seat 81 for separate or independent packaging and transportation. In some other embodiments, the armrest portion 82 is rotatably connected to the armrest seat 81, and the armrest portion 82 can be operated to rotate and fold correspondingly to reduce the overall volume of the frame in the folded state.

[0072] As Figures 9-11 shown, the lower end of the front foot rod 1 is pivotally connected with a front wheel set 11 that can rotate relative to the front foot rod 1 around the central axis of the pivot. A front wheel locking mechanism 6 for locking the front wheel set 11 relative to the front foot rod 1 to limit the rotation of the front wheel set 11 around the central axis of the pivot is provided between the front wheel set 11 and the lower end of the front foot rod 1. In this embodiment, the front wheel locking mechanism 6 locks the front wheel set 11 relative to the front foot rod 1, which can avoid the interference between the front wheel set and the rear wheel set or other parts of the frame during the folding process of the frame, is beneficial to the smooth folding of the frame, and has the characteristic of convenient folding; at the same time, it can ensure that the whole vehicle in the folded state is completely folded, which is convenient for carrying and storing. Among them, the front wheel locking mechanism 6 can lock the front wheel set 11 relative to the front foot rod 1 in the folded state.

[0073] Further, a front wheel linkage mechanism 7 is also provided on the frame for linking the action of the front wheel locking mechanism 6 to lock the front wheel set 11 relative to the front foot rod 1 during the folding process of the frame, so that the front wheel set 11 and the rear wheel set 21 are parallel to each other. Preferably, when the frame is in the folded state, the front wheel locking mechanism 6 locks the two front wheel sets 11 and is located outside the two rear wheel sets. Therefore, when the frame is folded, the front wheel set and the rear wheel set on the same side completely overlap, making the folding between the front foot rod and the rear foot rod more fitting and closer, and the structure of the folded frame is more compact and the overall volume is smaller.

[0074] The front wheel locking mechanism 6 is configured to be unlocked from the front wheel set 11 by the linkage of the front wheel linkage mechanism 7 when the frame is in the unfolded state, so that the front wheel set can be unlocked when the frame is unfolded without the user manually operating the front wheel locking mechanism 6 additionally, reducing the operation steps and being easy to use.

[0075] As Figure 9As shown, for reliable locking, the front wheel locking mechanism 6 includes a front wheel lock hole 61 eccentrically provided on the front wheel connecting seat 111 of the front wheel group 11, and a front wheel lock pin 62 movably provided at the lower end of the front foot rod 1 and capable of elastically inserting into the front wheel lock hole 61. A lock pin elastic member 63 for driving the front wheel lock pin 62 to elastically reset is provided between the front wheel lock pin 62 and the front foot rod 1; the front wheel lock pin 62 is configured to be linked by the front wheel linkage mechanism 7 during the folding process of the frame. Preferably, the front wheel lock pin 62 is configured to be linked by the front wheel linkage mechanism 7 located between the front foot rod and the front connecting seat during the rotational folding process of the front foot rod relative to the rear foot rod. Among them, the lock pin elastic member 63 can be a compression spring or a tension spring, etc.

[0076] As Figure 10 , 11 shown, for convenient unlocking, a rear connecting rod 22 is provided between the upper parts of the two rear foot rods 2, and a front connecting seat 23 rotatably connected to the upper end of the front foot rod 1 is provided on the rear connecting rod 22; a front wheel linkage mechanism 7 for linking the corresponding movement of the front wheel lock pin 62 is provided between the front connecting seat 23 and the front foot rod 1. The front wheel linkage mechanism 7 includes a front wheel sliding member 71 slidably provided on the front foot rod 1, and the front wheel sliding member 71 is connected to the front wheel lock pin 62 through a front wheel linkage member 72; the front wheel linkage mechanism 7 further includes a front wheel locking drive member 73 provided on the front connecting seat 23. A front wheel drive portion 731 for linking the corresponding sliding of the front wheel sliding member 71 during the corresponding rotation of the front foot rod 1 relative to the rear foot rod 2, thereby causing the front wheel lock pin 62 to insert into or withdraw from the front wheel lock hole 61, is provided on the front wheel locking drive member 73.

[0077] Among them, the front wheel linkage member 72 can be a rigid rod or a flexible cable, etc., and the front wheel drive portion 731 can be a front wheel drive inclined surface. During the rotational folding process of the front foot rod towards the rear foot rod side, the front wheel unlocking convex rod of the front wheel sliding member 71 moves from the high position of the front wheel drive portion 731 to the low position of the front wheel drive portion 731, thereby releasing the limiting effect on the front wheel sliding member 71. Then, the front wheel sliding member 71 cancels the pulling on the front wheel lock pin 62. At this moment, the front wheel lock pin 62 automatically inserts into the front wheel lock hole 61 under the elastic force of the lock pin elastic member 63 to lock the front wheel group 11 relative to the front foot rod 1. At the same time, the front wheel lock pin 62 drives the front wheel sliding member 71 to slide towards the side away from the front connecting seat 23 through the front wheel linkage member 72.

[0078] When the front foot rod is rotated and unfolded relative to the rear foot rod, the front wheel unlocking protrusion of the front wheel sliding member 71 moves from the low position of the front wheel driving part 731 to the high position of the front wheel driving part 731 to drive the front wheel sliding member 71 to slide accordingly, and the front wheel sliding member 71 pulls the front wheel locking pin 62 to move accordingly through the front wheel linkage member 72, so that the front wheel locking pin 62 withdraws from the front wheel locking hole 61 to release the locking state of the front wheel assembly 11 relative to the front foot rod 1. For this reason, the present embodiment only needs to operate and control the retraction and extension of the front foot rod to correspondingly link the locking state or unlocking state of the front wheel locking mechanism 6, which is convenient to use.

[0079] like Figures 1-7 As shown, in order to facilitate folding and unfolding, a seat frame 9 is further included, which includes a rear seat portion 91 relatively fixedly connected to the lower end of the push rod 3, a front seat portion 92 rotatably connected to the front side of the rear seat portion 91, the front seat portion 92 is connected to the front foot rod 1 via a seat support rod 93, the upper end of the seat support rod 93 is rotatably connected to the front part of the front seat portion 92, and the lower end of the seat support rod 93 is rotatably connected to the upper part of the front foot rod 1.

[0080] like Figures 1-7 As shown, in order to minimize the volume after folding, the push rod 3 includes a lower rod whose lower end is rotatably connected to the upper end of the rear foot rod 2 and an upper rod rotatably or slidably connected to the lower rod, an upper rod locking mechanism for locking the lower rod relative to the upper rod is provided between the upper rod and the lower rod, and an upper rod unlocking mechanism for interlocking the unlocking action of the upper rod locking mechanism is provided on the upper rod. The structure of the upper rod locking mechanism and the upper rod unlocking mechanism can refer to the structure of a foldable child stroller frame with application number 202323413075.6.

[0081] Among them, the frame unlocking mechanism is configured to be used to link the unlocking action of the frame locking mechanism when the upper rod is rotated and folded to a preset angle relative to the lower rod, and the operation and use are convenient.

[0082] In order to realize automatic folding, a folding torsion spring is provided between the upper end of the lower rod and the upper end of the lower rod, which is used to drive the upper rod to flip forward relative to the lower rod and fold forward, and the folding operation is realized automatically without the user having to perform additional operations to flip the upper rod forward relative to the lower rod.

Claims

1. A reliable stroller frame that can be switched between an unfolded state for use and a folded state for use, characterized in that include: A front foot rod (1), the lower end of which is connected to a front wheel set (11); A rear foot rod (2), the rear foot rod (2) being rotatably connected to the front foot rod (1), and the lower end of the rear foot rod (2) being connected to a rear wheel set (21); A push rod (3), the lower end of which is rotatably connected to the front foot rod (1) or the rear foot rod (2); A folding angle control mechanism (4), the folding angle control mechanism (4) being located between the front foot bar (1) and the rear foot bar (2), the folding angle control mechanism (4) being configured to prevent the front foot bar (1) from continuing to fold toward the rear foot bar (2) when the front foot bar (1) is rotated and folded relative to the rear foot bar (2) to a preset angle, so that the front foot bar (1) maintains an open angle relative to the rear foot bar (2) to ensure that the frame is stably in a standing folded use state, and to prevent the frame from tipping over during the initial action of switching from the folded use state to the unfolded use state; A linkage mechanism (5), the linkage mechanism (5) being located between the front foot rod (1), the rear foot rod (2) and the push rod (3), the linkage mechanism (5) being configured to link the front foot rod (1) with the rear foot rod (2) to move toward, fold or unfold accordingly when the push rod (3) rotates relative to the rear foot rod (2); A frame locking mechanism, the frame locking mechanism being located between the rear foot rod (2) and the push rod (3) and being used to lock the frame in an unfolded use state; A frame unlocking mechanism is located on the rear foot rod (2) or the push rod (3) and is used to link the unlocking action of the frame locking mechanism, thereby releasing the locked state of the frame.

2. The reliable children's bicycle frame according to claim 1, wherein The folding angle control mechanism (4) is also configured to release the obstruction of the front foot rod (1), allowing the front foot rod (1) to be further rotated and folded toward the side of the rear foot rod (2) so that the frame is in a fully folded state for use.

3. The reliable child carriage frame according to claim 1, wherein A rear connecting rod (22) is provided between the upper parts of the two rear foot rods (2), and a front connecting seat (23) rotatably connected to the upper end of the front foot rod (1) is provided on the rear connecting rod (22); The folding angle control mechanism (4) is located between the front foot rod (1) and the rear connecting rod (22); the folding angle control mechanism (4) comprises an angle control mounting seat (41) arranged on the front foot rod (1) or the rear connecting rod (22); the angle control mounting seat (41) is movably provided with an angle control blocking member (42) for blocking the front foot rod (1) from further folding toward the rear foot rod (2) when the front foot rod (1) is rotated and folded relative to the rear foot rod (2) to a preset angle; an angle control resetting member for driving the angle control blocking member (42) to elastically reposition is provided between the angle control blocking member (42) and the angle control mounting seat (41).

4. The reliable children's bicycle frame according to claim 3, wherein The angle control blocking member (42) is slidably arranged on the angle control mounting seat (41), and comprises an angle control blocking portion (421) for blocking and cooperating with the corresponding front foot rod (1) or rear foot rod (2) and an angle control avoiding portion (422) for avoiding the corresponding front foot rod (1) or rear foot rod (2).

5. The reliable child carriage frame according to claim 1, wherein The linkage mechanism (5) includes a first linkage member (51), a second linkage member (52), and a third linkage member (53). The upper end of the first linkage member (51) is rotatably connected to the lower part of the push rod (3). The lower end of the first linkage member (51) is rotatably connected to an extended connection end (521) protruding from the middle of the second linkage member (52). The rear end of the second linkage member (52) is rotatably connected to the upper part of the rear foot rod (2). The front end of the second linkage member (52) is rotatably connected to the rear end of the third linkage member (53). The front end of the third linkage member (53) is rotatably connected to the upper part of the front foot rod (1).

6. The reliable child carriage frame according to claim 1, characterized in that An armrest rod (8) that can be linked by the linkage mechanism (5) is connected to the push rod (3). The armrest rod (8) is configured to be linked and flipped upwards when the frame is in the standing and folded use state for easy lifting by the user.

7. The reliable child carriage frame according to claim 6, wherein The armrest rod (8) includes an armrest seat (81) hinged to the push rod (3) and an armrest portion (82) connected to the armrest seat (81). The lower end of the armrest seat (81) is connected to the linkage mechanism (5).

8. A reliable child stroller frame according to any one of claims 1-7, characterized in that The lower end of the front foot rod (1) is pivotally connected to a front wheel set (11) that can rotate relative to the front foot rod (1) about the central axis of the pivot. A front wheel locking mechanism (6) for locking the front wheel set (11) relative to the front foot rod (1) to limit the rotation of the front wheel set (11) about the central axis of the pivot is provided between the front wheel set (11) and the lower end of the front foot rod (1). A front wheel linkage mechanism (7) is also provided on the frame to lock the front wheel set (11) relative to the front foot rod (1) by driving the front wheel locking mechanism (6) to act during the folding process of the frame, so that the front wheel set (11) and the rear wheel set (21) are parallel to each other. The front wheel locking mechanism (6) is configured to be unlocked from locking the front wheel set (11) by being linked by the front wheel linkage mechanism (7) when the frame is in the unfolded use state.

9. The reliable child carriage frame according to claim 8, wherein The front wheel locking mechanism (6) includes a front wheel lock hole (61) eccentrically provided on a front wheel connection seat (111) of the front wheel set (11) and a front wheel lock pin (62) movably provided at the lower end of the front foot rod (1) and capable of elastically inserting into the front wheel lock hole (61). A lock pin elastic member (63) for driving the front wheel lock pin (62) to elastically reset is provided between the front wheel lock pin (62) and the front foot rod (1). The front wheel lock pin (62) is configured to be linked by the front wheel linkage mechanism (7) during the folding process of the frame.

10. The reliable child carriage frame according to claim 9, wherein A rear connecting rod (22) is provided between the upper parts of the two rear foot rods (2), and a front connecting seat (23) rotatably connected to the upper end of the front foot rod (1) is provided on the rear connecting rod (22); the front wheel linkage mechanism (7) is located between the front connecting seat (23) and the front foot rod (1), and the front wheel linkage mechanism (7) includes a front wheel sliding member (71) slidably arranged on the front foot rod (1), and the front wheel sliding member (71) is connected to the front wheel locking pin (62) through a front wheel linkage member (72); the front wheel linkage mechanism (7) further includes a front wheel locking drive member (73) arranged on the front connecting seat (23), and a front wheel drive portion (731) for driving the front wheel sliding member (71) to slide correspondingly during the corresponding rotation of the front foot rod (1) relative to the rear foot rod (2), so that the front wheel locking pin (62) is inserted into or withdrawn from the front wheel locking hole (61) is provided on the front wheel locking drive member (73).

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