Foldable child trailer

Abstract

The present invention relates to the technical field of child trailers, and discloses a foldable child trailer comprising: a chassis provided with a plurality of wheels; a support rod assembly and a bracket, the support rod assembly comprising a handle, an upper bracket, and a lower bracket hinged in sequence, the lower bracket being hinged to the chassis at one end remote from the upper bracket; the bracket being rotatably disposed on the chassis at one end remote from the support rod assembly, and the handle, bracket, upper bracket, and lower bracket being all foldable downward onto the chassis; a first locking mechanism comprising a movably disposed first locking member, the first locking member being capable of locking the handle to the upper bracket, the handle being provided with an unlocking member for unlocking the first locking member; and a second locking mechanism comprising a movably disposed second locking member, the second locking member being capable of locking the upper bracket to the lower bracket, the first locking mechanism being capable of driving the second locking member to unlock. Advantages of the present invention are that the child trailer can be folded with one button, the folding structure is simple, and folding is convenient; and the shock-absorbing mechanism at the rear wheel can achieve stepless adjustment of the shock-absorbing effect, which is convenient to adjust and has a wide adjustment range.

Description

Technical Field

[0001] The present invention relates to the technical field of child trailers, and in particular to a foldable child trailer. Background Art

[0002] Parents sometimes need to take their young children out for outings and often need to carry a child trailer with them. When playing, the child can be placed in the child trailer and towed or pushed to save the parents' energy.

[0003] Fixed child trailers take up a lot of space, making them inconvenient for transport, carrying, or moving around in a car. To make them easier to carry, manufacturers often design them to be foldable, unfolding them for use and folding them for transport. Existing child trailers are bulky and have complex folding mechanisms, making them difficult to fold and fold with a single click. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a foldable child trailer which has a simple structure, is convenient to fold, and can be folded with one button.

[0005] The present invention solves the technical problem by adopting a technical solution of providing a foldable child trailer, comprising:

[0006] a chassis having a plurality of wheels;

[0007] A support rod group and a bracket provided on the support rod group, wherein the support rod group includes a handle, an upper support rod, and a lower support rod hingedly connected in sequence from top to bottom, and one end of the lower support rod away from the upper support rod is hingedly connected to the chassis; one end of the bracket away from the support rod group is rotatably provided on the chassis, and the handle, the bracket, the upper support rod, and the lower support rod can all be folded downwardly onto the chassis;

[0008] a first locking mechanism comprising a first locking member movably disposed between the handle and the upper support rod, wherein the first locking member can lock the handle to the upper support rod, and an unlocking member is provided on the handle for unlocking the first locking member;

[0009] The second locking mechanism includes a second locking member movably arranged between the upper support rod and the lower support rod. The second locking member can lock the upper support rod on the lower support rod, and the first locking mechanism can drive the second locking member to unlock.

[0010] Furthermore, the first locking mechanism further comprises a first driving rotary disk and a second driving rotary disk respectively arranged on both sides of the first locking member, and the second locking mechanism further comprises a third driving rotary disk arranged on one side of the second locking member;

[0011] The first driving turntable is connected to the unlocking member via a first cable, and when the first locking member is unlocked, the first driving turntable can drive the second driving turntable to rotate; the second driving turntable and the third driving turntable are connected via a second cable.

[0012] Furthermore, a first protrusion is provided on a side of the first driving turntable close to the first locking member, and a second protrusion is provided on a side of the second driving turntable close to the first locking member;

[0013] When the first driving rotary disk drives the second driving rotary disk to rotate, the first protrusion abuts against the second protrusion.

[0014] Furthermore, the first locking member is provided with an arcuate through-slot, and the first protrusion and the second protrusion are both passed through the arcuate through-slot and can slide along the arcuate through-slot.

[0015] Furthermore, the first locking member and the second locking member are both locking gears, and the handle, the upper support rod and the lower support rod are all provided with internal teeth for the locking gears to engage with;

[0016] A first tensioning spring is provided between the second driving turntable and the first locking member to resist the two, and a second tensioning spring is provided on the side of the second locking member away from the third driving turntable, and both ends of the second tensioning spring are respectively against the lower support rod and the second locking member.

[0017] Furthermore, the handle has a plurality of first push blocks protruding toward the first driving turntable, and the plurality of first push blocks are arranged along the circumference of the first driving turntable and movably abut against the first driving turntable;

[0018] The upper support rod has a plurality of second push blocks protruding toward the side close to the third driving disk. The plurality of second push blocks are arranged along the circumference of the third driving rotary disk and movably resist the third driving rotary disk.

[0019] Furthermore, the first push block is provided with a first inclined wall, and the unlocking member can drive the first driving turntable to slide along the first inclined wall to unlock the first locking member;

[0020] The second push block is provided with a second inclined wall, and the second driving turntable can drive the third driving turntable to slide along the second inclined wall to unlock the second locking member.

[0021] Furthermore, the chassis includes a main body, a mounting base, a telescopic rod group, and an adjustment knob; wherein the mounting base is hinged to the main body and is provided with a first slide groove; the upper end of the telescopic rod group is hinged to the mounting base, and the lower end of the telescopic rod group is slidably disposed in the first slide groove, and the telescopic rod group includes a shock-absorbing spring; the adjustment knob is disposed on the mounting base and can drive the lower end of the telescopic rod group to slide along the first slide groove;

[0022] The wheels include a front wheel and a rear wheel, and the rear wheel is mounted on the mounting seat.

[0023] Furthermore, the lower end of the telescopic rod assembly is slidably mounted in the first slide groove via a pin shaft, a threaded hole is provided in the middle of the pin shaft, and the adjusting knob is provided with a screw rod, which is threadedly connected to the threaded hole;

[0024] The telescopic rod group includes an upper connecting rod and a lower connecting rod, and the shock-absorbing spring is sleeved on the upper connecting rod and the lower connecting rod; the upper connecting rod is provided with a mounting hole and a sliding pin passing through the mounting hole, and the lower connecting rod is provided with a second sliding groove along its axial direction, the lower connecting rod is inserted into the mounting hole, and the sliding pin is passed through the second sliding groove and can slide along the second sliding groove.

[0025] Furthermore, the first driving turntable, the first locking member and the second driving turntable are coaxially arranged;

[0026] The third driving turntable and the second locking member are coaxially arranged.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] In the present invention, an unlocking member is provided on the handle. Pressing the unlocking member unlocks the first locking member. When the first locking member is unlocked, the handle can be rotated relative to the upper support rod, thereby achieving folding of the handle. A second locking mechanism is provided between the upper support rod and the lower support rod. The second locking member in the second locking mechanism locks the upper support rod to the lower support rod when the trailer is unfolded. During the folding of the handle, the first locking mechanism unlocks the second locking member. When the second locking member is unlocked, the upper support rod can be rotated relative to the lower support rod. The lower support rod is also hinged to the chassis. The upper and lower support rods can rotate along their respective hinge points. Simultaneously, the front end of the bracket rotates along the chassis, completing the folding of the entire vehicle. Therefore, by pressing the unlocking member, the vehicle can be folded with one click, with a simple structure and convenient operation. The first locking member remains locked by the action of a first tensioning spring. When the unlocking member is pressed, the first driving rotary disc pushes the member to unlock. The second locking member remains locked by the action of a second tensioning spring. When the unlocking member is pressed and the handle is folded, the second driving rotary disc rotates, driving the third driving rotary disc via a second cable. The third driving rotary disc pushes the second locking member to unlock the member. The first and second locking members are securely locked and easily unlocked. The trailer can also be attached to the rear of a bicycle.

[0029] In the present invention, a shock-absorbing mechanism is provided at the rear wheel of the chassis, wherein a first slide is provided on the mounting seat, the upper end of the telescopic rod group is hinged to the main body, and the lower end thereof is slidably disposed in the first slide. By turning an adjustment knob, the position of the lower end of the telescopic rod group in the first slide can be changed, thereby changing the inclination angle of the telescopic rod group relative to the ground (and thereby changing the inclination angle of the shock-absorbing spring), thereby adjusting the shock-absorbing effect of the shock-absorbing mechanism. The screw on the adjustment knob engages with the threaded hole on the pin shaft. Turning the adjustment knob drives the pin shaft to slide along the first slide groove via the screw, thereby achieving stepless adjustment of the inclination angle of the telescopic rod group (i.e., stepless adjustment of the hardness of the shock-absorbing mechanism). The pin shaft can be adjusted to any position in the first slide groove, making adjustment convenient and wide-ranging. The entire shock-absorbing mechanism has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of the foldable child trailer (when unfolded) of the present invention;

[0031] Figure 2 is an exploded schematic diagram of the first locking mechanism and the second locking mechanism;

[0032] Figure 3 A longitudinal sectional view of the first drive rotary disc, the second drive rotary disc and the first locking member after assembly;

[0033] Figure 4 for Figure 3 A schematic diagram of the first protrusion abutting against the second protrusion;

[0034] Figure 5 for Figure 4 Schematic diagram of the first protrusion pushing the second protrusion after rotating a certain angle;

[0035] Figure 6 is a cross-sectional view of the first locking mechanism (when locked);

[0036] Figure 7 is a cross-sectional view of the first locking mechanism (unlocked);

[0037] Figure 8 is a cross-sectional view of the second locking mechanism (when locked);

[0038] Figure 9 is a cross-sectional view of the second locking mechanism (unlocked);

[0039] Figure 10 This is a structural diagram of the handlebar joint;

[0040] Figure 11 Schematic diagram of the structure of the upper support rod joint;

[0041] Figure 12 This is a schematic diagram of the structure of the trailer's shock-absorbing mechanism (when it is the softest);

[0042] Figure 13 This is a schematic diagram of the structure of the trailer's shock-absorbing mechanism (when it is the hardest);

[0043] Figure 14 This is an exploded schematic diagram of the shock absorbing mechanism (the main body is omitted);

[0044] Figure 15 for Figure 1 Side view of

[0045] Figure 16 This is a schematic diagram of the handle being folded;

[0046] Figure 17 A schematic diagram of the handle being fully folded onto the upper support bar;

[0047] Figure 18 It is a schematic diagram of the upper and lower support rods when they are folded;

[0048] Figure 19 This is a schematic diagram of the trailer after it is fully folded.

[0049] In the picture:

[0050] 1. Chassis; 10. Main body; 11. Mounting base; 111. First slide; 12. Telescopic rod assembly; 121. Shock-absorbing spring; 122. Pin; 122A. Threaded hole; 123. Upper connecting rod; 124. Lower connecting rod; 124A. Second slide; 124B. Long groove; 125. Sliding pin; 13. Adjustment knob; 131. Screw; 14. Front wheel; 15. Rear wheel; 16. Insertion tube

[0051] 2. Support rod assembly; 20. Handle; 20A. Handle joint; 201. Unlocking member; 202. First push block; 202A. First inclined wall; 21. Upper support rod; 21A. Upper support rod joint; 211. Second push block; 211A. Second inclined wall; 22. Lower support rod;

[0052] 3. Bracket;

[0053] 4. First locking mechanism; 40. First locking member; 401. Arc-shaped through slot; 41. First drive turntable; 411. First protrusion; 42. Second drive turntable; 421. Second protrusion; 43. First cable; 44. First tensioning spring;

[0054] 5. Second locking mechanism; 50. Second locking member; 51. Third driving turntable; 52. Second cable; 53. Second tensioning spring. DETAILED DESCRIPTION

[0055] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0056] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, in the present invention, descriptions such as "first," "second," and "one" are for descriptive purposes only and should not be understood to indicate or imply their relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0060] The seat pocket of this embodiment can be applied to children's products such as child strollers, child rocking chairs, and child beds. This embodiment is described in detail with reference to its application to child strollers.

[0061] like Figure 1-Figure 2 As shown, a foldable child trailer includes: a chassis 1, a support rod group 2, a bracket 3, a first locking mechanism 4 and a second locking mechanism 5.

[0062] The chassis 1 is equipped with multiple wheels, including two front wheels 14 and two rear wheels 15. The diameter of the two front wheels 14 is smaller than that of the two rear wheels 15. A plug-in tube 16 is located at the bottom of the chassis 1. This plug-in tube 16 is a square or rectangular tube and can be connected to the rear wheel axle of the bicycle via a rigid connector. The two front wheels 14 are detachable, allowing them to be quickly removed from the trailer. When the trailer is connected to the rear of the bicycle, the two front wheels 14 are detachable.

[0063] Specifically, if Figure 12-14As shown, the chassis 1 includes a main body 10, a mounting seat 11, a telescopic rod group 12 and an adjusting knob 13, which constitute a shock absorbing mechanism of the trailer, wherein the mounting seat 11 is hinged on the main body 10, and a first slide groove 111 is provided on the mounting seat 11; the upper end of the telescopic rod group 12 is hinged to the mounting seat 11, and the lower end of the telescopic rod group 12 is slidably disposed in the first slide groove 111, and the telescopic rod group 12 includes a shock absorbing spring 121, and the adjusting knob 13 is disposed on the mounting seat 11 and can drive the lower end of the telescopic rod group 12 to slide along the first slide groove 111; the rear wheel 15 is mounted on the mounting seat 11. The main body 10, the telescopic rod assembly 12 and the mounting base 11 form a triangle. Since the lower end of the telescopic rod assembly 12 is movably connected to the mounting base 11, which is equivalent to one vertex of the triangle being movable, when the adjustment knob 13 drives the lower end of the telescopic rod assembly 12 to move, the angle between the mounting base 11 and the main body 10, and the angle between the telescopic rod assembly 12 and the mounting base 11 will change.

[0064] Among them, the lower end of the telescopic rod group 12 is slidably installed in the first slide groove 111 through a pin shaft 122, and a threaded hole 122A is provided in the middle of the pin shaft 122. The adjusting knob 13 has a screw 131, and the screw 131 is threadedly connected to the threaded hole 122A. The screw 131 and the pin shaft 122 are threadedly matched to form a screw mechanism, which can realize the stepless adjustment shock absorption effect of the shock absorption mechanism. The telescopic rod group 12 includes an upper connecting rod 123 and a lower connecting rod 124, the shock-absorbing spring 121 is sleeved on the upper connecting rod 123 and the lower connecting rod 124, and the upper connecting rod 123 and the lower connecting rod 124 compress the shock-absorbing spring 121; the upper connecting rod 123 is provided with a mounting hole (not marked in the figure) and a sliding pin 125 passing through the mounting hole, that is, the upper connecting rod 123 is a hollow tube, and the lower connecting rod 124 is provided with a second sliding groove 124A along its axial direction, the lower connecting rod 124 is inserted into the mounting hole, and can move up and down along the upper connecting rod 123, the sliding pin 125 is passed through the second sliding groove 124A, and can slide along the second sliding groove 124A to guide the lower connecting rod 124 to prevent it from deflecting. During the actual driving of the trailer, the rear wheel 15 is mounted on the mounting seat 11 via a rotating shaft. When the trailer travels on a bumpy bottom surface, the rear wheel 15 pushes upward and compresses the shock-absorbing spring 121, and the shock-absorbing spring 121 absorbs the vibration.

[0065] During actual use, the child trailer of this embodiment is provided with a shock-absorbing mechanism at the rear wheel 15 of the chassis 1, wherein a first slide groove 111 is provided on the mounting seat 11, the upper end of the telescopic rod group 12 is hinged to the main body 10, and the lower end of the telescopic rod group 12 is slidably provided in the first slide groove 111. By turning the adjustment knob 13, the position of the lower end of the telescopic rod group 12 in the first slide groove 111 can be changed, thereby changing the inclination angle of the telescopic rod group 12 relative to the ground (the inclination angle of the shock-absorbing spring 121 is also changed) to adjust the shock-absorbing effect of the shock-absorbing mechanism. The screw 131 on the adjustment knob 13 is threadedly engaged with the threaded hole 122A on the pin 122. By turning the adjustment knob 13, the screw 131 can drive the pin 122 to slide along the first slide 111, thereby achieving stepless adjustment of the inclination angle of the telescopic rod group 12 (i.e., stepless adjustment of the softness and hardness of the shock absorbing mechanism). The pin 122 can be adjusted to any position in the first slide 111, which is convenient to adjust and has a wide adjustment range. The structure of the entire shock absorbing mechanism is simple. Figure 12 In the middle, the telescopic rod group 12 is perpendicular to the ground. At this time, the shock absorption effect of the shock absorption mechanism is the best and it is in the softest state. When the adjustment knob 13 is turned, the telescopic rod group 2 is adjusted to Figure 13 When the telescopic rod group 2 is in the position, the shock absorbing spring 121 does not have the shock absorbing effect in the horizontal separation during the working process, and the vertical component has the real shock absorbing effect. At this time, the shock absorbing mechanism is in the hardest state. Figure 12 and Figure 13 Stepless adjustment is performed between the two extreme positions to change the hardness of the shock absorbing mechanism.

[0066] like Figure 1-Figure 2 as well as Figures 15-19As shown, the support rod group 2 and the bracket 3 arranged on the support rod group 2, the support rod group 2 includes a handle 20, an upper support rod 21 and a lower support rod 22 hinged in sequence from top to bottom. It needs to be explained that the handle 20 in this embodiment includes a handle body and a handle joint 20A. For the convenience of manufacturing, the two can be set into a split type; similarly, the upper support rod 21 includes an upper support rod body and an upper support rod joint 21A. For the convenience of manufacturing, it can also be set into a split type. Since the upper and lower ends of the upper support rod 21 are both hinged structures, the upper support rod 21 includes upper and lower upper support rod joints 21A. However, in order to adapt to other structures, its specific detailed structure can be adaptively changed; the lower support rod 22 also includes a lower support rod body and a lower support rod joint. Setting the joint can facilitate manufacturing and it is simple to form a hinged structure. Among them, the end of the lower support rod 22 away from the upper support rod 21 is hinged to the chassis 1, that is, the lower end of the lower support rod 21 is hinged to the chassis 1; the end of the bracket 3 away from the support rod group 2 is rotatably set on the chassis 1, and the bracket 3 is assembled by rods and joints connected end to end, including two side end rods and front end rods and rear end rods respectively connected to the two ends of the two side end rods, the front end rod is hinged to the chassis 1, and the rear end rod is set on the handle 20, and the front end rod can be rotated to ensure that the bracket 3 can be folded.

[0067] The handle 20, the bracket 3, the upper support rod 21 and the lower support rod 22 can all be folded downward on the chassis 1. Figures 15-19 The figure shows the whole folding process of the foldable child trailer: Figure 15 The diagram shows the trailer being unfolded and locked. When the unlocking member 201 on the handle 20 is pressed, the handle 20 can be rotated downwards, and the handle 20 rotates relative to the upper support rod 21. Figure 16 The handle 20 is shown as being in the process of being rotated downward and folded. Figure 17 In the position shown, the handle 20 is completely folded onto the upper support rod 21. At this time, the second locking mechanism 5 is unlocked during the folding process of the handle 20, and the upper support rod 21 can rotate relative to the lower support rod 22, and the lower end of the lower support rod 22 can rotate relative to the chassis 1. Figure 18 The diagram shows the state of the upper support rod 21 and the lower support rod 22 in the process of folding downward. Figure 19 In the illustrated state, the trailer is completely folded. At this time, the handle 20, the upper support rod 21 and the lower support rod 22 are all folded onto the chassis 1 to ensure that the volume of the trailer after folding is minimized.

[0068] In order to ensure the structural stability of the trailer after it is unfolded, it needs to be locked with the help of a locking mechanism, and this locking mechanism needs to be unlocked when the trailer is folded. In this trailer, there are a first locking mechanism 4 and a second locking mechanism 5. The following is a detailed introduction to the two locking mechanisms in this trailer:

[0069] like Figure 2 As shown, the first locking mechanism 4 includes a first locking member 40 movably arranged between the handle 20 and the upper support rod 21. The first locking member 40 is a locking gear. The first locking member 40 can lock the handle 20 on the upper support rod 21. The handle 20 is provided with an unlocking member 201 for unlocking the first locking member 40. The unlocking member 201 is an unlocking button, which can also be called an unlocking knob. It is arranged in the middle of the handle 20. Pressing the unlocking button can drive the first locking member 40 to unlock from between the upper support rod 21 and the handle 20, ensuring that the handle 20 can be rotated and folded.

[0070] Among them, Figure 3-Figure 7 As shown, the first locking mechanism 4 also includes a first drive disc 41 and a second drive disc 42, respectively disposed on either side of the first locking member 40. The first drive disc 41, the first locking member 40, and the second drive disc 42 are coaxially arranged, with a common shaft passing through them to mount them. The first drive disc 41 is connected to the unlocking member 201 via a first cable 43. When the first locking member 40 is unlocked, the first drive disc 41 can drive the second drive disc 42 to rotate.

[0071] The second locking mechanism 5 includes a second locking member 50 movably disposed between the upper support rod 21 and the lower support rod 22. The second locking member 50 is also a locking gear. That is, the first locking member 40 and the second locking member 50 are both locking gears. The handle 20, the upper support rod 21, and the lower support rod 22 are each provided with a plurality of internal teeth for engagement with the locking gear. The second locking member 50 can lock the upper support rod 21 to the lower support rod 22. The second locking mechanism 5 also includes a third drive rotary disk 51 disposed on one side of the second locking member 50. The second drive rotary disk 42 and the third drive rotary disk 51 are connected by a second cable 52. The third drive rotary disk 51 and the second locking member 50 are coaxially disposed. The first locking mechanism 4 can drive the second locking member 50 to unlock. Specifically, the first driving turntable 41 in the first locking mechanism 4 rotates, thereby driving the second driving turntable 42 in the first locking mechanism 4 to rotate, and then driving the third driving turntable 51 in the second locking mechanism 5 to rotate, thereby forcing the second locking member 40 to unlock. In this process, it is equivalent to the indirect unlocking of the second locking member 40 by the unlocking member 201, ensuring that the trailer can be folded with one click, that is, it can be achieved by pressing the unlocking member 201.

[0072] like Figure 3-Figure 5The diagram illustrates the process of the first driving turntable 40 driving the second driving turntable 42 to rotate, wherein the first driving turntable 41 is provided with a first protrusion 411 on the side close to the first locking member 40, and the second driving turntable 42 is provided with a second protrusion 421 on the side close to the first locking member 40; when the first driving turntable 41 drives the second driving turntable 42 to rotate, the first protrusion 411 abuts against the second protrusion 421. Specifically, the first locking member 40 is provided with an arcuate slot 401, and the first protrusion 411 and the second protrusion 421 are both provided in the arcuate slot 401 and can slide along the arcuate slot 401. Figure 3 The positions of the first protrusion 411 and the second protrusion 421 are shown in the figure, which is the state when the handle is unfolded and locked. When the first locking member 40 is unlocked, the first protrusion 411 can rotate along the arc-shaped groove 401; Figure 4 The diagram shows the state of the handle 20 during folding. At this time, the first protrusion 411 contacts the second protrusion 421. When the handle 20 is continued to be rotated, the first protrusion 411 drives the second protrusion 421 to rotate, thereby realizing the rotation of the second driving turntable 42. When the state is reached as shown in FIG. Figure 5 In the position shown, the handle 20 is completely folded and the second locking member 50 is also unlocked.

[0073] like Figure 6-Figure 9 As shown, a first tensioning spring 44 is provided between the second driving turntable 42 and the first locking member 40 to resist the two, and a second tensioning spring 53 is provided on the side of the second locking member 50 away from the third driving turntable 51, and the two ends of the second tensioning spring 53 are respectively against the lower support rod 22 and the second locking member 50.

[0074] During use, the first locking member 40 remains in a locked state under the action of the first tensioning spring 44. When the unlocking member 201 is pressed, the first driving turntable 41 pushes and unlocks the first locking member 50. The second locking member 50 remains in a locked state under the action of the second tensioning spring 53. When the unlocking member 201 is pressed and the handle 20 is folded, the second driving turntable 42 rotates and drives the third driving turntable 51 through the second cable 52. The third driving turntable 51 pushes the second locking member 50 to unlock the first locking member 40 and the second locking member 50. The locking of the first locking member 40 and the second locking member 50 is reliable and the unlocking is convenient.

[0075] Specifically, if Figure 10 and Figure 11As shown, the handle 20 has a plurality of first push blocks 202 protruding toward the side close to the first driving rotary disk 41. The plurality of first push blocks 202 are arranged along the circumference of the first driving rotary disk 41 and movably abut against the first driving rotary disk 41. The first push blocks 202 can force the first driving rotary disk 41 to move along its axial direction so as to unlock the first locking member 40. The upper support rod 21 has a plurality of second push blocks 211 protruding toward the side close to the third driving rotary disk 51. The plurality of second push blocks 211 are arranged along the circumference of the third driving rotary disk 51 and movably abut against the third driving rotary disk 51. The second push blocks 211 can force the third driving rotary disk 51 to move along its axial direction so as to unlock the second locking member 50.

[0076] The first push block 202 is provided with a first slanted wall 202A. The unlocking member 201 can drive the first driving rotary disk 41 to slide along the first slanted wall 202A to unlock the first locking member 40. The first driving rotary disk 41 can be provided with a slanted wall that matches the first slanted wall 202A. The second push block 211 is provided with a second slanted wall 211A. The second driving rotary disk 42 can drive the third driving rotary disk 51 to slide along the second slanted wall 211A to unlock the second locking member 50. The third driving rotary disk 51 can be provided with a slanted wall that matches the second slanted wall 211A.

[0077] like Figure 6-Figure 7 As shown, the specific unlocking process of the first locking mechanism 4 in this embodiment is illustrated: Figure 6 In the schematic state, under the action of the first tensioning spring 44, the first locking member 40 is locked between the handle 20 and the upper support rod 21; when the unlocking member 201 is pressed, the unlocking member 201 drives the first driving turntable 41 to rotate through the first cable 43, and due to the setting of the first push block 202, the first driving turntable 41 is forced to move along its axial direction, that is, the first driving turntable 41 drives the first locking member 40 to move to the right. When it moves to Figure 7 In the state shown, the first locking member 40 is unlocked from between the upper support rod 21 and the handle 20, and the handle 20 can be rotated downward and folded.

[0078] like Figure 8-Figure 9 As shown, the specific unlocking process of the second locking mechanism 5 in this embodiment is illustrated: when the trailer is in the unfolded state, Figure 8The diagram shows a locked state, in which the second locking member 50 is locked between the upper support rod 21 and the lower support rod 22; when the first locking member 40 is unlocked and the handle 20 is completely folded onto the upper support rod 21, the second drive turntable 42 will drive the third drive turntable 51 to rotate through the second cable, and due to the setting of the second push block 211, the third drive turntable 51 is forced to move along its axial direction, that is, the third drive turntable 51 drives the second locking member 50 to move to the left, completing the unlocking from between the upper support rod 21 and the lower support rod 22, and the upper support rod 21 can be folded downward, and the lower support rod 22 can also be folded downward.

[0079] In general, in this embodiment, an unlocking member 201 is provided on the handle 20. Pressing the unlocking member 201 unlocks the first locking member 40. When the first locking member 40 is unlocked, the handle 20 can rotate relative to the upper support rod 21, thereby folding the handle 20. A second locking mechanism 5 is provided between the upper support rod 21 and the lower support rod 22. When the trailer is unfolded, the second locking member 50 in the second locking mechanism 5 locks the upper support rod 21 to the lower support rod 22. During the folding process of the handle 20, the first locking mechanism 4 unlocks the second locking member 50. When the second locking member 50 is unlocked, the upper support rod 21 can rotate relative to the lower support rod 22. Since the lower support rod 22 is also hinged to the chassis 1, the upper and lower support rods 21 and 22 can rotate along their respective hinge points. Simultaneously, the front end of the bracket 3 rotates along the chassis 1, completing the folding of the entire vehicle. Therefore, by pressing the unlocking member 201, the vehicle can be folded with one click, which has a simple structure and convenient operation.

[0080] In this solution, the child trailer can be folded with one button, and the folding structure is simple and convenient; the shock-absorbing mechanism at the rear wheel can achieve stepless adjustment of the shock-absorbing effect, which is convenient to adjust and has a wide adjustment range.

Claims

1. A foldable child trailer, characterized in that: include: a chassis having a plurality of wheels; A support rod group and a bracket provided on the support rod group, wherein the support rod group includes a handle, an upper support rod, and a lower support rod hingedly connected in sequence from top to bottom, and one end of the lower support rod away from the upper support rod is hingedly connected to the chassis; one end of the bracket away from the support rod group is rotatably provided on the chassis, and the handle, the bracket, the upper support rod, and the lower support rod can all be folded downwardly onto the chassis; a first locking mechanism comprising a first locking member movably disposed between the handle and the upper support rod, wherein the first locking member can lock the handle to the upper support rod, and an unlocking member is provided on the handle for unlocking the first locking member; a second locking mechanism comprising a second locking member movably disposed between the upper support rod and the lower support rod, wherein the second locking member can lock the upper support rod on the lower support rod, and the first locking mechanism can drive the second locking member to unlock; The first locking mechanism further comprises a first driving rotary disk and a second driving rotary disk respectively arranged on both sides of the first locking member, and the second locking mechanism further comprises a third driving rotary disk arranged on one side of the second locking member; The first driving rotary disk is connected to the unlocking member via a first cable, and when the first locking member is unlocked, the first driving rotary disk can drive the second driving rotary disk to rotate; The second driving turntable and the third driving turntable are connected via a second cable; A first protrusion is provided on a side of the first driving rotary disk close to the first locking member, and a second protrusion is provided on a side of the second driving rotary disk close to the first locking member; when the first driving rotary disk drives the second driving rotary disk to rotate, the first protrusion abuts against the second protrusion; The handle is provided with a plurality of first push blocks protruding toward the side close to the first driving turntable, and the plurality of first push blocks are arranged along the circumference of the first driving turntable and movably abut against the first driving turntable; the upper support rod is provided with a plurality of second push blocks protruding toward the side close to the third driving turntable, and the plurality of second push blocks are arranged along the circumference of the third driving turntable and movably abut against the third driving turntable; The first push block is provided with a first inclined wall, and the unlocking member can drive the first driving turntable to slide along the first inclined wall to unlock the first locking member; The second push block is provided with a second inclined wall, and the second driving turntable can drive the third driving turntable to slide along the second inclined wall to unlock the second locking member.

2. The foldable child trailer according to claim 1, characterized in that: The first locking member is provided with an arcuate through-slot, and the first protrusion and the second protrusion are both passed through the arcuate through-slot and can slide along the arcuate through-slot.

3. The foldable child trailer according to claim 1, characterized in that: The first locking member and the second locking member are both locking gears, and the handle, the upper support rod and the lower support rod are all provided with internal teeth for the locking gears to engage; A first tensioning spring is provided between the second driving turntable and the first locking member to resist the two, and a second tensioning spring is provided on the side of the second locking member away from the third driving turntable, and both ends of the second tensioning spring are respectively against the lower support rod and the second locking member.

4. The foldable child trailer according to claim 1, characterized in that: The chassis includes a main body, a mounting base, a telescopic rod group, and an adjustment knob; wherein the mounting base is hinged to the main body and is provided with a first slide groove; the upper end of the telescopic rod group is hinged to the mounting base, and the lower end of the telescopic rod group is slidably disposed in the first slide groove, and the telescopic rod group includes a shock-absorbing spring; the adjustment knob is disposed on the mounting base and can drive the lower end of the telescopic rod group to slide along the first slide groove; The wheels include a front wheel and a rear wheel, and the rear wheel is mounted on the mounting seat.

5. The foldable child trailer according to claim 4, characterized in that: The lower end of the telescopic rod assembly is slidably mounted in the first sliding groove via a pin shaft, a threaded hole is provided in the middle of the pin shaft, and a screw is provided on the adjusting knob, and the screw is threadedly connected to the threaded hole; The telescopic rod group includes an upper connecting rod and a lower connecting rod, and the shock-absorbing spring is sleeved on the upper connecting rod and the lower connecting rod; the upper connecting rod is provided with a mounting hole and a sliding pin passing through the mounting hole, and the lower connecting rod is provided with a second sliding groove along its axial direction, the lower connecting rod is inserted into the mounting hole, and the sliding pin is passed through the second sliding groove and can slide along the second sliding groove.

6. The foldable child trailer according to claim 1, characterized in that: The first driving turntable, the first locking member and the second driving turntable are coaxially arranged; The third driving turntable and the second locking member are coaxially arranged.

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