stroller

Abstract

The utility model relates to the technical field of baby carriage, disclose a cart, including front support, rear support, push rod and support rod, and front support is equipped with front wheel, rear support includes with rear support swing connection rear support and with rear support sliding connection extension rod, and extension rod is equipped with rear wheel, push rod is at least one rotation connection with front support and rear support, support rod supports between push rod and rear support, and the first end of support rod rotates with push rod around the first axis, and the second end of support rod rotates with rear support around the second axis, when the cart converts from the first use state to the second use state, rear support rotates to the direction away from front support, and the wheel track of rear wheel and front wheel increases, and extension rod slides to the direction away from rear support, and the second axis moves relatively downwards or the first axis moves relatively upwards or support rod slides and contracts, this cart is simple in structure, and convenient to adjust, and through adjusting the wheel track of front and rear wheels and the position of support rod, can realize the free conversion of single and double person car state.

Description

Technical Field

[0001] This utility model relates to the field of children's vehicle technology, and in particular to a stroller. Background Technology

[0002] To facilitate outdoor activities with two children at the same time, strollers with both single and double seating modes have appeared on the market. In double seating mode, two seats can be installed for two children; in single seating mode, one seat can be installed for one child.

[0003] However, in existing technology, the distance between the front and rear wheels of a stroller is fixed and cannot be adjusted, regardless of whether it is in single or double stroller mode. This means that if the distance is designed for double stroller mode, the stroller occupies a large space when in single stroller mode; conversely, if the distance is designed for single stroller mode, placing two seats simultaneously in double stroller mode would be cramped, resulting in lower comfort for the child. Furthermore, the adjustment mechanisms for switching between single and double stroller modes in existing strollers are complex, inconvenient, and costly.

[0004] Therefore, there is an urgent need for a trolley to solve the above-mentioned technical problems. Utility Model Content

[0005] Based on the above, the purpose of this utility model is to provide a trolley that has a simple structure, is easy to adjust, and has low cost. In single-person mode, it can save space, and in double-person mode, it can accommodate two seats without being crowded, providing good comfort.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a trolley, comprising:

[0008] The front bracket has a front wheel at its bottom;

[0009] The rear support includes a rear support rod rotatably connected to the front support and an extension rod slidably connected to the rear support rod, wherein a rear wheel is provided at the end of the extension rod away from the rear support rod;

[0010] The push rod is rotatably connected to at least one of the front bracket and the rear bracket;

[0011] A support rod is provided between the push rod and the rear support rod. The first end of the support rod rotates relative to the push rod about a first axis, and the second end of the support rod rotates relative to the rear support rod about a second axis.

[0012] The trolley has a first use state and a second use state. When switching from the first use state to the second use state, the rear support rod rotates away from the front support, and the wheelbase between the rear wheel and the front wheel increases.

[0013] The extension rod slides away from the rear support rod along the extension direction of the rear support rod.

[0014] The second axis moves downward relative to the first axis, or the support rod slides and retracts.

[0015] In some possible implementations, the first end of the support rod is rotatably mounted to the push rod, a rotating member is rotatably mounted on the rear support rod, and the second end of the support rod is rotatably mounted to the rotating member about a second axis. When switching from the first use state to the second use state, the rotating member rotates the second end of the support rod to make the second axis move downward.

[0016] In some possible implementations, the trolley further includes a linkage disposed between the rotating member and the extension rod, the linkage being rotatably connected to both the rotating member and the extension rod.

[0017] When switching from the first use state to the second use state, the rotating component is rotated, and the linkage component drives the extension rod to slide in a direction away from the rear support rod. At the same time, the second end of the support rod flips downward with the rotating component.

[0018] In some possible implementations, the rotating member rotates relative to the rear support rod along a third axis. The rotating member has a body and a first connecting portion and a second connecting portion extending outward from the body. The first connecting portion and the second connecting portion extend in different directions. The third axis is located on the body.

[0019] The support rod rotates relative to the first connecting part via a second axis, and the linkage is rotatably mounted on the second connecting part.

[0020] In some possible implementations, four quadrants are formed with the third axis as the center, the front-back direction as the X direction, and the up-down direction as the Y direction, wherein the rearward direction is the positive direction and the upward direction is the positive direction. In the first use state, the second axis is located in the first quadrant, and in the second use state, the second axis is located in the third quadrant.

[0021] In some possible implementations, the trolley further includes a control lever for rotating the rotating member, the control lever being disposed at the second connecting portion and extending from the second connecting portion toward the inside of the frame.

[0022] In some possible implementations, the rear support is provided in pairs and arranged side by side in the left-right direction. Each of the rear support rods is rotatably mounted with a rotating component. The control lever is connected and fixed between the two rotating components and drives the two rotating components to rotate synchronously to achieve synchronous movement of the two extension rods.

[0023] In some possible implementations, the trolley has a rotary locking structure and a rotary unlocking structure for locking the rotating member to the rear support rod, the rotary locking structure including a locking block disposed on one of the rear support rod and the rotating member and a locking hole disposed on the other;

[0024] In the first use state, the lock block slides to the keyhole to restrict the rotation of the rotating member. The rotary unlocking structure is linked with the lock block and moves between the unlocked position and the locked position. In the locked position, the lock block is positioned in the keyhole. In the unlocked position, the lock block disengages from the keyhole.

[0025] In some possible implementations, the keyhole is located on the rear support rod, the lock block is slidably disposed on the rotating member, and the rotary unlocking structure includes an unlocking member movably disposed on the control lever and an unlocking linkage mechanism that links the unlocking member and the lock block.

[0026] In some possible implementations, the unlocking element is sleeved outside the control lever and rotates circumferentially along the control lever to the unlocked and locked positions. The unlocking linkage mechanism includes a sliding rod that moves along the extension direction of the control lever, a guide post that extends radially along the sliding rod, and an oblique groove disposed on the unlocking element. The oblique groove is oblique to the movement direction of the sliding rod. The guide post is located within the oblique groove and can slide along the oblique groove. When the unlocking element moves toward the unlocked position, the guide post slides along the oblique groove and drives the sliding rod to move away from the rotating element. The locking block is linked with the sliding rod to move toward the position disengaged from the lock hole.

[0027] In some possible implementations, the lock hole includes a first locking hole and a second locking hole provided on the rear support rod. In a first use state, the lock block is locked with the first locking hole, and in a second use state, the lock block is locked with the second locking hole. The first locking hole is located above the second locking hole in the vertical direction.

[0028] In some possible implementations, the first end of the support rod is rotatably mounted to the push rod, and the second end of the support rod is slidable relative to the rear support rod. When transitioning from the first use state to the second use state, the support rod slides along the rear support rod in a direction that causes the second axis to move downward.

[0029] In some possible implementations, the trolley also has a sliding linkage mechanism disposed between the extension rod and the support rod, wherein when the extension rod moves away from the rear support rod, the sliding linkage mechanism drives the support rod to slide downward toward the second axis.

[0030] In some possible implementations, the support rod is provided with a sliding post that is slidably disposed on the rear support rod, the sliding post extending in a direction parallel to the second axis, and the rear support rod is provided with a sliding adaptation part that is adapted to the sliding post;

[0031] The sliding adapter is a first movable slide groove formed on the rear support rod; the first movable slide groove has a first end and a second end, and when switching from the first use state to the second use state, the second axis of the support rod moves from the first end to the second end, and the height of the first end in the vertical direction is higher than that of the second end;

[0032] The sliding linkage mechanism cooperates with the sliding column so that when the extension rod moves away from the rear support rod, the sliding linkage mechanism drives the sliding column to move from the first end to the second end.

[0033] In some possible implementations, the rear support rod is sleeved outside the extension rod, and the sliding linkage mechanism includes a first oblique guide groove disposed on the extension rod, the extension direction of the first oblique guide groove being oblique to the sliding direction of the extension rod, and the sliding column being simultaneously slidably disposed in the first oblique guide groove and the first moving slide groove.

[0034] The extension rod has a stretching direction that slides away from the rear support rod and a shortening direction that slides towards the rear support rod, and the first oblique guide groove is inclined away from the stretching direction of the extension rod.

[0035] In some possible implementations, the lower end of the push rod is rotatably connected to the upper end of the front support via a fourth axis, and the front support, the push rod, the support rod, and the rear support rod form a four-bar linkage so that the trolley can be folded in both the first and second use states.

[0036] In some possible implementations, the trolley further includes an adjustment assembly, which is plate-shaped and supported between the two rear support rods. The adjustment assembly is rotatably mounted to the rear support rods via a pivot. A first end of a support rod is rotatably mounted to the push rod, and a second end of the support rod is rotatably mounted to the back of the adjustment assembly via a second axis. The pivot is located below the second axis. When transitioning from a first usage state to a second usage state, the adjustment assembly flips with the second end of the support rod to move the second axis downward.

[0037] The adjustment assembly includes a housing and a locking tongue for locking with the rear support rod. The locking tongue is movably disposed within the housing. The rear support rod is provided with a first locking hole and a second locking hole. The first locking hole and the second locking hole are arranged along the extension direction of the rear support rod and are respectively located on both sides of the rotating shaft. In a first use state, the locking tongue is locked in the first locking hole. In a second use state, the locking tongue is locked in the second locking hole. The first locking hole is located above the rotating shaft, and the second locking hole is located below the rotating shaft.

[0038] In some possible implementations, in a first use state, the back of the adjustment component is disposed facing out of the vehicle body, and in a second use state, the back of the adjustment component is rotated to be disposed facing in the vehicle body.

[0039] In some possible implementations, the rear support further includes an inner sleeve fixed inside the rear support rod, and the extension rod slidably connected inside the inner sleeve; the extension rod is provided with a guide groove extending along the axial direction of the extension rod, and the inner sleeve is provided with a sliding part slidably connected to the guide groove.

[0040] This utility model also provides another type of cart, including:

[0041] The front bracket has a front wheel at its bottom;

[0042] The rear support includes a rear support rod rotatably connected to the front support and an extension rod rotatably connected to the rear support rod, wherein a rear wheel is provided at the end of the extension rod away from the rear support rod;

[0043] The push rod is rotatably connected to at least one of the front bracket and the rear bracket;

[0044] A support rod is provided between the push rod and the rear support rod. The first end of the support rod rotates relative to the push rod about a first axis, and the second end of the support rod rotates relative to the rear support rod about a second axis.

[0045] The trolley has a first use state and a second use state. When switching from the first use state to the second use state, the rear support rod rotates away from the front support, and the wheelbase between the rear wheel and the front wheel increases.

[0046] The extension rod is rotated to a position that increases the length of the rear support rod in the extension direction;

[0047] The second axis moves downward relative to the first axis, or the support rod slides and retracts.

[0048] This utility model also provides another type of cart, including:

[0049] The front bracket has a front wheel at its bottom;

[0050] The rear support includes a rear support rod rotatably connected to the front support and an extension rod movably connected to the rear support rod, wherein a rear wheel is provided at the end of the extension rod away from the rear support rod;

[0051] The push rod is rotatably connected to at least one of the front bracket and the rear bracket;

[0052] A support rod is provided between the rear support rod and the push rod; the first end of the support rod rotates relative to the push rod about a first axis, and the second end of the support rod rotates relative to the rear support rod about a second axis.

[0053] The trolley has a first use state and a second use state. When switching from the first use state to the second use state, the rear support rod rotates away from the front support, and the wheelbase between the rear wheel and the front wheel increases.

[0054] The extension rod moves toward extending the rear support rod;

[0055] The second axis moves downward relative to the first axis, or the support rod slides and retracts.

[0056] The beneficial effects of this utility model are:

[0057] The trolley provided by this utility model, by setting an extension rod, can adjust the length of the rear support and change the wheelbase between the front and rear wheels. By changing the position of the support rod, the tilt angle of the front support remains constant during the wheelbase change, thus ensuring good support for the trolley and improving its safety. When the trolley is in its first usage state, there is a first gap between the front and rear wheels, and the trolley is in single-person mode, which can accommodate one seat, saving space and making it convenient for use in smaller spaces. When the trolley is in its second usage state, there is a second gap between the front and rear wheels, and the trolley is in double-person mode. Since the second gap is larger than the first gap, two seats can be installed on the frame, providing a spacious and comfortable installation. This utility model has a simple structure, is easy to adjust, and is low in cost. By adjusting the wheelbase between the front and rear wheels and adjusting the position of the support rod, the trolley can be freely switched between single-person and double-person modes. Attached Figure Description

[0058] Figure 1 This is a structural diagram of the trolley (without the first seat installed) provided in Embodiment 1 of this utility model when it is in single-person trolley mode;

[0059] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0060] Figure 3 This is a structural diagram of the trolley (without the first seat installed) provided in Embodiment 1 of this utility model during the process of switching from a single-person trolley state to a two-person trolley state;

[0061] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0062] Figure 5 This is a structural diagram of the trolley (without the second and third seat pockets) provided in Embodiment 1 of this utility model when it is in a two-person trolley state;

[0063] Figure 6 yes Figure 5 A magnified view of a section at point C;

[0064] Figure 7 This is a structural diagram of the trolley (with a first seat pocket) provided in Embodiment 1 of this utility model when it is in single-person trolley mode;

[0065] Figure 8 This is a structural diagram of the trolley (equipped with a first seat pocket) provided in Embodiment 1 of this utility model during the process of switching from a single-person trolley state to a two-person trolley state;

[0066] Figure 9This is a schematic diagram of the structure of the trolley (equipped with a second seat and a third seat) provided in Embodiment 1 of this utility model when it is in the form of a two-person trolley;

[0067] Figure 10 This is a structural schematic diagram of the folding process of the trolley provided in Embodiment 1 of this utility model;

[0068] Figure 11 This is a schematic diagram of the trolley in its folded state according to Embodiment 1 of this utility model;

[0069] Figure 12 This is a rear view of the trolley provided in Embodiment 1 of this utility model;

[0070] Figure 13 yes Figure 12 A magnified view of a section at point D;

[0071] Figure 14 This is a cross-sectional view of the trolley at the control lever provided in Embodiment 1 of this utility model;

[0072] Figure 15 yes Figure 14 A magnified view of a section at point E in the middle;

[0073] Figure 16 This is a schematic diagram of the structure of the trolley in single-person mode according to Embodiment 2 of this utility model;

[0074] Figure 17 This is a partial structural diagram of the trolley provided in Embodiment 2 of this utility model when it is in single-person trolley mode;

[0075] Figure 18 This is a schematic diagram of the structure of the trolley in the two-person trolley state provided in Embodiment 2 of this utility model;

[0076] Figure 19 This is a partial structural diagram of the trolley in the two-person trolley state provided in Embodiment 2 of this utility model;

[0077] Figure 20 This is a structural schematic diagram of the folding process of the trolley provided in Embodiment 2 of this utility model;

[0078] Figure 21 This is a schematic diagram of the trolley in its folded state according to Embodiment 2 of this utility model;

[0079] Figure 22 This is a schematic diagram of the structure of the trolley in single-person mode according to Embodiment 3 of this utility model;

[0080] Figure 23 This is a schematic diagram of the structure of the trolley in the two-person trolley state provided in Embodiment 3 of this utility model;

[0081] Figure 24 This is a structural schematic diagram from another perspective when the trolley provided in Embodiment 3 of this utility model is in single-person trolley mode;

[0082] Figure 25 yes Figure 24 A magnified view of a section at point H in the middle;

[0083] Figure 26 This is a partial structural diagram of the trolley provided in Embodiment 3 of this utility model when it is in single-person trolley mode;

[0084] Figure 27 This is a schematic diagram showing the connection of the rear support, rear wheels, linkage, support rod, and basket rod when the trolley is in single-person mode, as provided in Embodiment 3 of this utility model.

[0085] Figure 28 This is a schematic diagram showing the connection of the rear support, rear wheels, linkage, support rod, and basket rod when the trolley is in the two-person trolley state according to Embodiment 3 of this utility model;

[0086] Figure 29 This is a schematic diagram of the extension rod and rear wheel involved in Embodiment 3 of this utility model;

[0087] Figure 30 This is a schematic diagram of the structure of the adjustment component involved in Embodiment 3 of this utility model;

[0088] Figure 31 This is a schematic diagram of the linkage component involved in Embodiment 3 of this utility model;

[0089] Figure 32 This is a schematic diagram of the support rod according to Embodiment 3 of this utility model;

[0090] Figure 33 This is a schematic diagram of the structure of the basket pole according to Embodiment 3 of this utility model;

[0091] Figure 34 This is a schematic diagram of the connecting rod involved in Embodiment 3 of this utility model;

[0092] Figure 35 This is a schematic diagram of the connecting pin involved in Embodiment 3 of this utility model.

[0093] In the picture:

[0094] 1. Front bracket; 11. Fifth axis; 2. Front wheel; 3. Rear bracket; 31. Rear support rod; 311. First locking hole; 312. Second locking hole; 32. Extension rod; 4. Rear wheel; 5. Push rod; 50. Second connecting ear; 51. First axis; 52. Fourth axis; 6. Support rod; 711. Control lever; 7111. Limiting groove; 710. Locking block; 712. Sliding rod; 714. Unlocking component; 7141. Angled sliding groove; 715. Guide post; 72. Rotating component; 721. Third axis; 722. Second axis; 7201. Body; 7202. First connecting part; 7203. Second connecting part; 8. Linkage component; 91. First seat pocket connector; 92. Second seat pocket connector; 93. Third seat pocket connector; 94. First seat pocket; 95. Second seat pocket; 96. Third seat pocket; 10. Armrest;

[0095] 313, First movable slide groove; 3131, First end; 3132, Second end; 321, First oblique guide groove;

[0096] 314. First lock hole; 315. Second moving slide; 3151. Third end; 3152. Fourth end; 322. Guide slide; 323. Second oblique guide groove; 33. Inner sleeve; 331. First fixing hole; 332. Second fixing hole; 73. Adjustment component; 731. Locking tongue; 732. Housing; 7321. First connecting ear; 733. Rotating shaft; 734. Locking part; 735. Unlocking handle; 736. Pull rope; 9. Basketball hoop rod; 901. Sixth axis; 902. Connecting rod; 903. Connecting pin. Detailed Implementation

[0097] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0098] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0099] In the description of this utility model, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0100] Example 1

[0101] like Figures 1 to 15 As shown, this embodiment provides a trolley, including a front support 1, a front wheel 2, a rear support 3, a rear wheel 4, a push rod 5, and a support rod 6. The front support 1 is located on the front side of the vehicle body, and the front wheel 2 is mounted on the bottom of the front support 1. The rear support 3 is located on the rear side of the vehicle body, and the rear support 3 includes a rear support rod 31 and an extension rod 32. The rear support rod 31 is rotatably connected to the front support 1, and the extension rod 32 is slidably connected to the rear support rod 31. The extension rod 32 can extend backward or retract forward relative to the rear support rod 31. The rear wheel 4 is mounted on the end of the extension rod 32 away from the rear support rod 31. The push rod 5 is rotatably connected to at least one of the front support 1 and the rear support 3, and the push rod 5 facilitates the user to push the trolley. It should be noted that if folding is not considered, the push rod 5 can be rotatably mounted on the rear support 3, or the push rod 5 can be coaxially rotatably configured with the front support 1 and the rear support 3; however, considering the convenience of folding the frame, in this embodiment, the push rod 5 is preferably rotatably connected to the front support 1. The support rod 6 is supported between the push rod 5 and the rear support rod 31. The upper end of the support rod 6 rotates relative to the push rod 5 around the first axis 51, and the lower end of the support rod 6 rotates relative to the rear support rod 31 around the second axis 722.

[0102] The trolley in this embodiment has a first usage state and a second usage state. When switching from the first usage state to the second usage state, the rear support rod 31 rotates away from the front support 1, and the wheelbase between the rear wheel 4 and the front wheel 2 increases. At the same time, the extension rod 32 slides away from the rear support rod 31 along the extension direction of the rear support rod 31. The second axis 722 moves downward or the first axis 51 moves upward or the support rod 6 slides and retracts to adapt to the change in the trolley's state and ensure good support.

[0103] Specifically, the first usage state of this embodiment is a single-person cart state, and the second usage state is a two-person cart state. When the cart is switched from the single-person cart state to the two-person cart state, the purpose of the second axis 722 moving downwards or the first axis 51 moving upwards or the support rod 6 sliding and retracting is that when the rear support 3 flips backwards, the middle support rod 6 needs to make way. This making way can be that the lower end of the support rod 6 moves downwards, the upper end of the support rod 6 moves upwards, or the entire support rod 6 is shortened. As for the shortening of the support rod 6, it can be sliding and retracting or rotating and folding. The reason why the support rod 6 needs to make way in this embodiment is that if the front and rear wheel track of the trolley increases, the tilt angle of the entire front support 1 will decrease, meaning the front support 1 will tilt backward. This causes the axle of the front wheel 2 to change from an upright state to a tilted state, making it more susceptible to damage. Furthermore, the backward tilt of the front support 1 also makes the frame prone to tipping over. The purpose of this invention is to maintain a constant tilt angle of the front support 1 when the wheel track changes. To maintain this constant tilt angle, the support rod 6 needs to make way when the rear support 3 flips backward. This can be achieved by shortening the length of the support rod 6, moving the lower end of the support rod 6 downward, or moving the upper end of the support rod 6 upward. Preferably, in this embodiment, when the trolley transitions from a single-person trolley to a two-person trolley, a flipping mechanism is used to move the second axis 722 downward.

[0104] The trolley provided in this embodiment, by setting an extension rod 32, can adjust the length of the rear support 3 and change the wheelbase between the front wheel 2 and the rear wheel 4. By changing the position of the support rod 6, the tilt angle of the front support 1 can remain unchanged during the process of changing the wheelbase, thereby ensuring good support for the trolley and improving the safety of using the trolley. When the trolley is in single-person mode, there is a first gap between the front wheel 2 and the rear wheel 4, which allows for the installation of a seat, saving space and facilitating use in smaller spaces. When the trolley is in double-person mode, there is a second gap between the front wheel 2 and the rear wheel 4. Since the second gap is larger than the first gap, two seats can be installed on the frame, providing a spacious and comfortable installation space. This embodiment has a simple structure, is easy to adjust, and is low in cost. By adjusting the wheelbase between the front wheel 2 and the rear wheel 4 and adjusting the position of the support rod 6, the trolley can be freely switched between single-person and double-person modes.

[0105] Optionally, in this embodiment, a second connecting lug 50 is fixed on the push rod 5, and the upper end of the support rod 6 is rotatably connected to the second connecting lug 50 around the first axis 51. A rotating component 72 is rotatably mounted on the rear support rod 31, and the lower end of the support rod 6 is rotatably mounted to the rotating component 72 around the second axis 722. When the trolley is converted from a single-person trolley state to a double-person trolley state, the rotating component 72 rotates the lower end of the support rod 6 to move the second axis 722 downward. This embodiment, by moving the support rod 6 downward as a whole, can adapt to the change of the trolley's double-person trolley state. Its structure is simple, the connection is reliable, and it can achieve stable support for the vehicle body. It should be noted that in some embodiments, the upper end of the support rod 6 can also be slidably connected to the push rod 5, allowing the upper end of the support rod 6 to rotate relative to the push rod 5 around the first axis 51; in addition, in some embodiments, the lower end of the support rod 6 can also be slidably connected to the rear support rod 31, allowing the lower end of the support rod 6 to rotate around the second axis 722. Optionally, in this embodiment, the support rod 6 is L-shaped, including a first connecting arm and a second connecting arm set at an angle. The first connecting arm is rotatably connected to the push rod 5, and the second connecting arm is rotatably connected to the rotating member 72. In this embodiment, the length of the first connecting arm is greater than the length of the second connecting arm, and the first connecting arm and the second connecting arm form an obtuse angle.

[0106] Furthermore, the trolley in this embodiment also has a linkage component 8. The linkage component 8 is disposed between the rotating component 72 and the extension rod 32, and both ends of the linkage component 8 are rotatably connected to the rotating component 72 and the extension rod 32, respectively. When the trolley is switched from a single-person trolley state to a double-person trolley state, by rotating the rotating component 72, the linkage component 8 can drive the extension rod 32 to slide in a direction away from the rear support rod 31, thereby increasing the overall length of the rear support 3. At the same time, the rotating component 72 drives the lower end of the support rod 6 to flip downward. This arrangement makes the linkage of the trolley better and the switching between single and double-person trolley states more convenient. Optionally, the linkage component 8 in this embodiment adopts an L-shaped connecting piece, which has a simple structure and reliable connection.

[0107] In this embodiment, the rotating component 72 is rotatably mounted on the rear support rod 31 about a third axis 721. Specifically, the rotating component 72 includes a body 7201 and a first connecting portion 7202 and a second connecting portion 7203 extending outward from the body 7201. The first connecting portion 7202 and the second connecting portion 7203 extend in different directions, and the third axis 721 is located on the body 7201. The support rod 6 rotates relative to the first connecting portion 7202 via the second axis 722, and the linkage 8 is rotatably mounted on the second connecting portion 7203. Optionally, the rotating component 72 is L-shaped, wherein the lengths of the first connecting portion 7202 and the second connecting portion 7203 are equal or close, and the included angle between the first connecting portion 7202 and the second connecting portion 7203 is approximately 90 degrees.

[0108] Furthermore, such as Figures 1-6As shown, with the third axis 721 as the center, the front-to-back direction of the vehicle body is the X direction, and the up-and-down direction of the vehicle body is the Y direction, forming four quadrants. The rearward direction and the upward direction are considered positive directions. In single-person vehicle mode, the second axis 722 is located in the first quadrant; in two-person vehicle mode, the second axis 722 is located in the third quadrant. This arrangement ensures that when switching from single-person to two-person vehicle mode, the lower end of the support rod 6 moves from the first quadrant to the third quadrant, that is, moves towards the front and lower side of the vehicle body, facilitating proper support of the push rod 5 by the support rod 6.

[0109] To facilitate operation of the rotating component 72, the trolley in this embodiment also includes a control lever 711. The control lever 711 is connected to the second connecting part 7203 and extends from the second connecting part 7203 toward the inner side of the frame. In use, the rotating component 72 is rotated around the third axis 721 by holding the control lever 711, making operation convenient and effortless. It should be noted that in this embodiment, the frame includes two sets of side supports, each set of side supports including a front support 1, a front wheel 2, a rear support 3, a rear wheel 4, a push rod 5, and a support rod 6. The "inner side of the frame" mentioned above refers to the area located between the two sets of side supports. In addition, in this embodiment, the two sets of rear supports 3 are arranged side by side in the left-right direction, and a rotating component 72 is rotatably mounted on each rear support rod 31. The two ends of the control lever 711 are connected and fixed to the two rotating components 72 on both sides to drive the two rotating components 72 to rotate synchronously, thereby realizing the synchronous movement of the two extension rods 32. This arrangement makes the trolley structure simpler and the layout more compact.

[0110] The trolley in this embodiment also has a rotary locking structure and a rotary unlocking structure for locking the rotating member 72 onto the rear support rod 31. The rotary locking structure includes a locking block 710 disposed on one of the rear support rod 31 and the rotating member 72, and a lock hole disposed on the other. When the trolley is in single-person or double-person mode, by sliding the locking block 710 into the lock hole, the rotation of the rotating member 72 can be restricted, thereby locking the trolley. Specifically, in this embodiment, the lock hole is disposed on the rear support rod 31, and the locking block 710 is slidably disposed on the rotating member 72. The rotary unlocking structure is linked with the locking block 710 and moves between the unlocked and locked positions. In the locked position, the locking block 710 is positioned in the lock hole, and in the unlocked position, the locking block 710 is disengaged from the lock hole. The rotary unlocking structure includes an unlocking member 714 movably disposed on the control lever 711 and an unlocking linkage mechanism between the unlocking member 714 and the locking block 710. The control lever 711 has a tubular structure and a limiting groove 7111 extending axially on it. The unlocking component 714 is a sleeve that fits around the control lever 711 and rotates circumferentially along the control lever 711 to the unlocked and locked positions. The unlocking linkage mechanism includes a sliding rod 712, which is movably disposed within the control lever 711 and can move along the extension direction of the control lever 711. The sliding rod 712 is linked with the locking block 710. A guide post 715 is provided on the sliding rod 712, extending radially along the sliding rod 712. The unlocking component 714 is provided with an oblique groove 7141, which is oblique to the moving direction of the sliding rod 712. The guide post 715 is located in the oblique groove 7141 and can slide along the oblique groove 7141. At the same time, the guide post 715 is also located in the limiting groove 7111 and can slide along the limiting groove 7111. In this embodiment, by rotating the unlocking component 714 toward the unlocking position, the guide post 715 can be driven to slide along the oblique groove 7141 and the limiting groove 7111, thereby driving the sliding rod 712 to move away from the rotating component 72, and thus causing the locking block 710 to move toward the position of disengaging from the lock hole. It should be noted that in this embodiment, the locking block 710 and the sliding rod 712 can be directly connected and fixed by means of screwing, welding, snap-fitting, etc., or they can be indirectly connected by a linkage structure. This embodiment has a simple structure, convenient adjustment process, and easy operation, and can quickly realize the switching between the two states of the trolley, saving user time.

[0111] Furthermore, this embodiment provides two sliding rods 712. The ends of the two sliding rods 712 that are far apart are respectively connected to locking blocks 710, and the ends of the two sliding rods 712 that are close together are respectively provided with guide posts 715. When the two sliding rods 712 are far apart, the two locking blocks 710 extend outwards simultaneously to engage with the lock holes on the rear support rod 31, thereby locking the position of the rotating member 72 and the rear support rod 31. When the two sliding rods 712 are close together, the two locking blocks 710 disengage from the lock holes simultaneously, thereby unlocking the rotating member 72 and the rear support rod 31. Optionally, a rotating sleeve is also fitted around the unlocking member 714. The rotating sleeve is fixedly connected to the unlocking member 714. Rotating the rotating sleeve can drive the unlocking member 714 to rotate. The outer circumference of the rotating sleeve is also provided with anti-slip textures to facilitate user operation and prevent slippage.

[0112] Furthermore, the locking holes include a first locking hole 311 and a second locking hole 312 disposed on the rear support rod 31, with the first locking hole 311 and the second locking hole 312 respectively located on both sides of the third axis 721. In single-person cart mode, the locking block 710 locks with the first locking hole 311; in double-person cart mode, the locking block 710 locks with the second locking hole 312. The first locking hole 311 is located vertically above the second locking hole 312. This embodiment achieves locking of the cart in two usage states by locking the locking block 710 with either the first locking hole 311 or the second locking hole 312. Its structure is simple and the connection is reliable, ensuring the safety of the cart during normal pushing in single-person or double-person cart mode.

[0113] In this embodiment, the stroller is equipped with a first seat connector 91, which is detachably mounted at the connection between the front support 1 and the push rod 5, for mounting the first seat 94. When the stroller is switched to single-person mode, the first seat 94 can be fixed to the stroller via the first seat connector 91, facilitating the riding of a single child. Furthermore, the stroller is equipped with a second seat connector 92 and a third seat connector 93. The second seat connector 92 is detachably mounted on the front support 1 and located below the first seat connector 91, for mounting the second seat 95; the third seat connector 93 is detachably mounted on the push rod 5 and located above the first seat connector 91, for mounting the third seat 96. When the stroller is switched to double-person mode, the second seat 95 and the third seat 96 can be fixed to the stroller via the second seat connector 92 and the third seat connector 93, facilitating the riding of two children simultaneously. It should be noted that the first seat connector 91, the second seat connector 92 and the third seat connector 93 in this embodiment can all be pre-installed on the trolley, or the corresponding seat connectors can be installed on the trolley when single or double mode is required, or the seat connectors can be directly set on the corresponding seats for assembly with the trolley.

[0114] Furthermore, the lower end of the push rod 5 is rotatably connected to the upper end of the front support 1 via a fourth axis 52, and the upper ends of the front support 1 and the rear support 3 are rotatably connected via a fifth axis 11, wherein the fourth axis 52 is located between the first axis 51 and the fifth axis 11. This arrangement forms a four-bar linkage between the front support 1, push rod 5, support rod 6, and rear support rod 31, allowing the trolley to be folded by operating the push rod 5 regardless of whether it is in single-person or double-person mode. Moreover, the first axis 51 and the fifth axis 11 are spaced a certain distance from the fourth axis 52, facilitating the installation of the first seat connector 91 at the fourth axis 52. Additionally, the trolley provided in this embodiment does not require unlocking the rotating part 72 from the rear support rod 31 when folding, allowing the trolley to remain in either single-person or double-person mode for convenient reuse.

[0115] To facilitate user operation, a handrail 10 is provided above and behind the push rod 5 in this embodiment. The handrail 10 is slidably connected to the push rod 5 and can be pulled outward or retracted inward relative to the push rod 5. When the trolley is switched to a two-seater mode, pulling out the handrail 10 further increases the length of the trolley, providing more space for the installation of two seats and making it easier for the user to push the trolley. Specifically, a snap-fit ​​structure is provided between the handrail 10 and the push rod 5. When the trolley is being pushed normally, the handrail 10 and the push rod 5 are snapped together and fixed. When the length of the handrail 10 needs to be adjusted, the snap-fit ​​structure is unlocked, and the handrail 10 can be pulled outward or pushed inward.

[0116] The process of switching the stroller from single-person stroller mode to double-person stroller mode in this embodiment is as follows:

[0117] Figure 1 In this embodiment, the trolley is in single-person mode. When it needs to be converted to double-person mode, rotating the unlocking member 714 causes the locking block 710 to disengage from the first locking hole 311. At this time, the rotating member 72 is unlocked from the rear support rod 31. The control lever 711 drives the rotating member 72 to rotate around the third axis 721. The rotating member 72 drives the support rod 6 to flip forward, and at the same time, the linkage 8 causes the extension rod 32 to move backward relative to the rear support rod 31 (i.e., Figure 3 The locking block 710 extends in the F direction (in the direction of F) to increase the track width between the front wheel 2 and the rear wheel 4; when the locking block 710 is aligned with the second locking hole 312, the unlocking member 714 is reset, and the locking block 710 extends into the second locking hole 312, thereby locking the rotating member 72 with the rear support rod 31; then, the armrest 10 is moved backward and upward from the push rod 5 (i.e., Figure 3 Pull out in the G direction (as shown in the image) to switch the cart to the desired position. Figure 5 The two-seater vehicle is shown in the image.

[0118] Example 2

[0119] like Figures 16-21As shown, this embodiment provides another type of trolley, which has a structure that is basically the same as the trolley in Embodiment 1. The difference is that the trolley in this embodiment does not have a rotating part 72, a locking block 710, a locking hole, a control lever 711, a sliding rod 712, an unlocking part 714, and a linkage part 8. The support rod 6 in this embodiment is slidably connected to the rear bracket 3. When the trolley is converted from a single-person trolley to a double-person trolley, the support rod 6 can move downward relative to the rear bracket 3.

[0120] The trolley in this embodiment includes a front support 1, front wheels 2, a rear support 3, rear wheels 4, a push rod 5, and a support rod 6. The front support 1 is located on the front side of the vehicle body, and the front wheels 2 are mounted on the bottom of the front support 1. The rear support 3 is located on the rear side of the vehicle body and includes a rear support rod 31 and an extension rod 32. The rear support rod 31 is rotatably connected to the front support 1, and the extension rod 32 is slidably connected to the rear support rod 31. The extension rod 32 can extend rearward or retract forward relative to the rear support rod 31. The rear wheels 4 are mounted on the end of the extension rod 32 away from the rear support rod 31. The push rod 5 is rotatably connected to the front support 1, allowing the user to easily push the trolley. The support rod 6 is supported between the push rod 5 and the rear support rod 31. The upper end of the support rod 6 rotates relative to the push rod 5 around a first axis 51, and the lower end of the support rod 6 is slidably mounted on the rear support rod 31. The lower end of the support rod 6 can rotate relative to the rear support rod 31 around a second axis 722. When the trolley is switched from a single-person trolley mode to a two-person trolley mode, the rear support rod 31 rotates away from the front support rod 1, and the extension rod 32 slides away from the rear support rod 31 along the extension direction of the rear support rod 31, increasing the wheelbase between the rear wheel 4 and the front wheel 2. At the same time, the support rod 6 slides along the rear support rod 31, so that the second axis 722 moves downward, thereby adapting to the adjustment of the trolley to the two-person trolley mode. This ensures that the tilt angle of the front support rod 1 remains unchanged during the process of changing the wheelbase, guaranteeing stable support for the trolley and improving the safety of using the trolley.

[0121] Furthermore, the trolley also features a sliding linkage mechanism disposed between the extension rod 32 and the support rod 6. When the extension rod 32 moves away from the rear support rod 31, the sliding linkage mechanism drives the support rod 6 to slide downwards along the second axis 722, thereby converting the trolley into a two-person trolley state. When the extension rod 32 moves closer to the rear support rod 31, the sliding linkage mechanism drives the support rod 6 to slide upwards along the second axis 722, thereby converting the trolley into a single-person trolley state. This embodiment achieves linkage between the extension rod 32 and the support rod 6, facilitating the driving of the support rod 6 via the extension rod 32 to better adapt to changes in the trolley's state and ensure stable support for the trolley body.

[0122] In this embodiment, a sliding post is provided at the lower end of the support rod 6, extending in a direction parallel to the second axis 722. A sliding adapter is provided on the rear support rod 31, and the sliding post is slidably connected to the sliding adapter. Preferably, the axis of the sliding post is the second axis 722. Specifically, the sliding adapter is a first movable groove 313 formed on the rear support rod 31; the first movable groove 313 has a first end 3131 and a second end 3132. When switching from a single-person vehicle to a two-person vehicle, the second axis 722 of the support rod 6 moves from the first end 3131 to the second end 3132, and the first end 3131 is higher than the second end 3132 in the vertical direction. The above structure realizes a sliding connection between the lower end of the support rod 6 and the rear support rod 31, which is simple in structure and reliable in sliding. Preferably, the extension direction of the first movable groove 313 is perpendicular to the extension direction of the rear support rod 31.

[0123] Furthermore, the sliding linkage mechanism cooperates with the sliding column so that when the extension rod 32 moves away from the rear support rod 31, the sliding linkage mechanism drives the sliding column to move from the first end 3131 to the second end 3132. Specifically, the rear support rod 31 is sleeved on the extension rod 32, and the sliding linkage mechanism includes a first oblique guide groove 321 disposed on the extension rod 32. The extension direction of the first oblique guide groove 321 is obliquely intersecting the sliding direction of the extension rod 32, and the sliding column is simultaneously slidably disposed within the first oblique guide groove 321 and the first moving slide groove 313. The extension rod 32 has a stretching direction that slides away from the rear support rod 31 and a shortening direction that slides towards the rear support rod 31, and the first oblique guide groove 321 is inclined away from the stretching direction of the extension rod 32. Specifically, as Figure 17 As shown, in the plane where the first inclined guide groove 321 is located, with the sliding direction of the extension rod 32 as the X direction and the direction perpendicular to the X direction and inclined upward as the Y direction, the extension direction of the first inclined guide groove 321 is inclined downward compared to the X direction, and the inclination of the first inclined guide groove 321 is opposite to the stretching direction of the extension rod 32.

[0124] Reference Figure 20 and Figure 21 In this embodiment, the front bracket 1, push rod 5, support rod 6 and rear support rod 31 form a four-bar linkage mechanism, so that the trolley can be folded by operating the push rod 5 whether it is in single-person or double-person mode.

[0125] Example 3

[0126] like Figures 22-35As shown, this embodiment provides another type of trolley, including a front support 1, a front wheel 2, a rear support 3, a rear wheel 4, a push rod 5, and a support rod 6. The front support 1 is located on the front side of the vehicle body, and the front wheel 2 is mounted on the bottom of the front support 1. The rear support 3 is located on the rear side of the vehicle body, and the rear support 3 includes a rear support rod 31 rotatably connected to the front support 1 and an extension rod 32 movably connected to the rear support rod 31. The rear wheel 4 is mounted on the end of the extension rod 32 away from the rear support rod 31. When the extension rod 32 extends rearward relative to the rear support rod 31, the wheelbase between the rear wheel 4 and the front wheel 2 increases; when the extension rod 32 shortens forward relative to the rear support rod 31, the wheelbase between the rear wheel 4 and the front wheel 2 decreases. The push rod 5 is rotatably connected to at least one of the front support 1 and the rear support 3. Preferably, in this embodiment, the push rod 5 is rotatably connected to the front support 1, and the push rod 5 facilitates the user to push the trolley. Support rod 6 is supported between rear support rod 31 and push rod 5. The upper end of support rod 6 is rotatably connected to push rod 5 around first axis 51, and the lower end of support rod 6 rotates relative to rear support rod 31 around second axis 722. The trolley has a first usage state and a second usage state. When switching from the first usage state to the second usage state, rear support rod 31 rotates away from front support 1, increasing the wheelbase between rear wheel 4 and front wheel 2; simultaneously, extension rod 32 moves in the direction of extending rear support rod 31; second axis 722 moves downward relative to each other to adapt to the change in trolley state, ensuring that the tilt angle of front support 1 remains unchanged during the wheelbase change, guaranteeing good support and improving the safety of trolley use. Specifically, in this embodiment, the first usage state is a single-person trolley state, and the second usage state is a two-person trolley state. In this embodiment, extension rod 32 is movably connected to rear support rod 31, for example, it can be a sliding connection. In this embodiment, the extension rod 32 moves toward the direction of extending the rear support rod 31. This can be achieved by the extension rod 32 sliding backward relative to the rear support rod 31, or by the extension rod 32 itself becoming longer. For example, the extension rod 32 can be configured as a telescopic rod structure to flexibly adjust its own length.

[0127] Furthermore, the stroller also includes a basket pole 9. The basket pole 9 is located on the lower rear side of the stroller body and is used to place personal items. The basket pole 9 is movably mounted on the support rod 6. The stroller also has a linkage mechanism between the extension rod 32 and the basket pole 9. When the extension rod 32 moves towards the extended rear support rod 31, the extension rod 32 drives the basket pole 9 to move through the linkage mechanism to adjust the posture of the basket pole 9. In this embodiment, when adjusting the wheelbase between the front wheels 2 and the rear wheels 4, the stroller can simultaneously achieve the following linkage of the basket pole 9, ensuring that the posture of the basket pole 9 remains unchanged before and after switching between single and double stroller states, preventing the basket pole 9 from tilting, and ensuring the normal use of the basket pole 9. This utility model has a simple structure, is easy to operate, and has low cost. It simultaneously achieves the posture adjustment of the basket pole 9 while switching between single and double stroller states.

[0128] Optionally, in this embodiment, the rim rod 9 is rotatably mounted on the support rod 6 via the sixth axis 901. The rim rod 9 has a connecting end that is rotatably connected to the linkage mechanism. When the extension rod 32 slides away from the rear support rod 31, the linkage mechanism drives the rim rod 9 to rotate so that the connecting end moves downward. Further, the linkage mechanism includes a connecting rod 902 rotatably connected to the connecting end of the rim rod 9. The end of the connecting rod 902 away from the rim rod 9 is a movable end, which is movably connected to the extension rod 32 so that when the extension rod 32 moves away from the rear support rod 31, it drives the connecting rod 902 to move downward as a whole. This embodiment has a simple structure and ingenious design. The movement of the connecting rod 902 realizes the pulling of the rim rod 9, thereby changing the posture of the rim rod 9. It should be noted that in this embodiment, the frame includes two sets of side supports, left and right. Each set of side supports includes a front support 1, a front wheel 2, a rear support 3, a rear wheel 4, a push rod 5, and a support rod 6. The basket pole 9 includes a U-shaped frame and a basket mounted on the U-shaped frame. One open end of the U-shaped frame faces the front of the cart. The two arms of the U-shaped frame are rotatably connected to two support rods 6, and two connecting rods 902 are rotatably connected to the connecting ends of the two arms of the U-shaped frame. Specifically, the connecting rods 902 are strip-shaped connecting pieces.

[0129] Furthermore, in this embodiment, the rear support rod 31 is sleeved outside the extension rod 32. The extension rod 32 is provided with a second oblique guide groove 323, the extension direction of which is oblique to the sliding direction of the extension rod 32. The extension rod 32 has a stretching direction that slides away from the rear support rod 31 and a shortening direction that slides towards the rear support rod 31. The second oblique guide groove 323 is inclined away from the stretching direction of the extension rod 32. The rear support rod 31 is provided with a second movable slide groove 315, which has a third end 3151 and a fourth end 3152. The third end 3151 is higher than the fourth end 3152 in the vertical direction. Specifically, in this embodiment, the second movable slide groove 315 is perpendicular to the extension direction of the rear support rod 31. The movable end of the connecting rod 902 is simultaneously slidably connected to the second movable slide groove 315 and the second inclined guide groove 323 via the connecting pin 903. When the trolley is switched from a single-person trolley state to a double-person trolley state, the connecting pin 903 moves from the third end 3151 to the fourth end 3152. In this embodiment, the connecting pin 903 is limited by the second movable slide groove 315 and the second inclined guide groove 323, thus guiding and limiting the rotation of the basket rod 9, so that the basket rod 9 can be kept in a horizontal position to facilitate the placement of items in the basket.

[0130] The trolley in this embodiment also includes an adjustment assembly 73. The adjustment assembly 73 includes a housing 732, which is plate-shaped and supported between two rear support rods 31. Specifically, the length direction of the housing 732 is perpendicular to the two rear support rods 31. A pivot portion 733 is provided inside the housing 732, located on one side of the housing 732 along its width direction, with both ends of the pivot portion 733 rotatably connected to the two rear support rods 31. The lower end of the support rod 6 is rotatably mounted on the back of the housing 732 via a second axis 722, with the pivot portion 733 positioned below the second axis 722. This allows the lower end of the support rod 6 to rotate and move the second axis 722 downwards when transitioning from a single-person trolley to a two-person trolley, thereby adapting the support rod 6 to the change in trolley position and ensuring stable support for the trolley body. Specifically, in single-person vehicle mode, the back of housing 732 faces outwards from the vehicle body (i.e., the rear of the vehicle body), while in two-person vehicle mode, the back of housing 732 rotates to face inwards from the vehicle body (i.e., the front of the vehicle body). In this embodiment, the back of housing 732 is the back of adjustment assembly 73.

[0131] Furthermore, the trolley also includes a linkage 8, which is disposed between the adjustment component 73 and the extension rod 32. The upper end of the linkage 8 is rotatably connected to the adjustment component 73, and the lower end of the linkage 8 is rotatably connected to the extension rod 32. When the trolley is switched from a single-person trolley state to a double-person trolley state, rotating the adjustment component 73 can drive the extension rod 32 to move in the direction of the extended rear support rod 31. In this embodiment, by rotating the adjustment component 73, the extension rod 32 can be extended or retracted relative to the rear support rod 31. Specifically, when the adjustment component 73 is rotated to the first position, the extension rod 32 is shortened forward relative to the rear support rod 31. At this time, the wheelbase between the front wheel 2 and the rear wheel 4 is relatively small, and the stroller is in single-person mode, where one seat can be installed, which helps to save the overall space occupied by the stroller and is convenient for use in smaller spaces. When the adjustment component 73 is rotated to the second position, the extension rod 32 is extended backward relative to the rear support rod 31. At this time, the wheelbase between the front wheel 2 and the rear wheel 4 is larger, and the stroller is in double-person mode, where there is enough space on the frame to install two seats, so that children can ride comfortably without feeling crowded.

[0132] In this embodiment, the adjusting component 73, when rotating, simultaneously drives the extension rod 32, the support rod 6, and the basket pole 9 in a coordinated manner. This ensures that the posture of the basket pole 9 remains unchanged before and after switching between single and double-rider modes when adjusting the wheelbase between the front wheels 2 and the rear wheels 4, preventing the basket pole 9 from tilting and ensuring its normal use. This invention features a simple structure, convenient operation, and low cost. Users can switch between single and double-rider modes with one hand, and the operation is completed in one step, simultaneously adjusting the posture of the basket pole 9.

[0133] In this embodiment, the rear support rod 31 is provided with a first locking hole 314 and a second locking hole. The first locking hole 314 and the second locking hole are arranged along the extension direction of the rear support rod 31 and are respectively located on both sides of the axis of the rotating shaft 733. In this embodiment, the first locking hole 314 is located above the axis of the rotating shaft 733, and the second locking hole is located below the axis of the rotating shaft 733. The adjustment assembly 73 also includes a locking tongue 731, a reset member, and an unlocking mechanism. The locking tongue 731 is movably disposed within the housing 732. In the single-person vehicle state, the reset member can lock the locking tongue 731 with the first locking hole 314 to lock the adjustment assembly 73 relative to the rear support rod 31 in a first position; in the two-person vehicle state, the reset member can lock the locking tongue 731 with the second locking hole to lock the adjustment assembly 73 relative to the rear support rod 31 in a second position; the unlocking mechanism is used to unlock the locking tongue 731 to facilitate rotation of the adjustment assembly 73. When switching between single and double-person trolley modes, the trolley provided in this embodiment first unlocks the adjustment component 73, then rotates the adjustment component 73 to change the wheelbase between the front wheel 2 and the rear wheel 4. When the adjustment component 73 moves to the desired position, the adjustment component 73 is locked by the locking tongue 731 to ensure the reliability of the trolley's use.

[0134] It should be noted that when the adjusting component 73 drives the extension rod 32 to slide upwards or downwards relative to the rear support rod 31, the connecting pin 903 slides within the second inclined guide groove 323 and simultaneously slides within the second movable slide groove 315, thereby adjusting the posture of the basket pole 9. When the adjusting component 73 is locked in the first or second position, the extension rod 32 cannot slide relative to the rear support rod 31, and the connecting pin 903 cannot slide within the second inclined guide groove 323 and the second movable slide groove 315. This achieves the locking of the positions of the connecting rod 902 and the basket pole 9, ensuring that the basket pole 9 remains in a horizontal position regardless of whether it is in single-person or two-person vehicle mode, facilitating the user's placement of items. Of course, in other embodiments, the positions of the adjusting component 73 and the basket pole 9 can also be locked in other ways, and this embodiment is not the only one that can achieve this.

[0135] Furthermore, the adjustment assembly 73 also includes a locking part 734 and a pull rope 736. The locking part 734 is located on the other side of the housing 732 along the width direction. The upper ends of the two linkages 8 are rotatably connected to the two ends of the locking part 734, and the two latches 731 are telescopically located at the two ends of the locking part 734. Each latch 731 can pass through the upper end of the corresponding linkage 8 and lock with the corresponding rear support rod 31. The reset member is an elastic member connected to the latches 731, and the elastic member has a tendency to extend the latches 731 out of the locking part 734. Specifically, the elastic member is a compression spring. The unlocking mechanism is an unlocking handle 735, which is mounted on the housing 732 and located on the same side as the locking part 734. The unlocking handle 735 is connected to a pull rope 736, which is connected to a locking tongue 731. By operating the unlocking handle 735, the locking tongue 731 can overcome the elastic force of the elastic element and retract into the locking part 734, thereby unlocking the locking tongue 731 from the rear bracket 3. At this time, the entire adjusting assembly 73 can rotate around the rotating shaft 733. When the unlocking handle 735 is released, under the elastic force of the elastic element, the locking tongue 731 pops out of the locking part 734, thereby locking with the first locking hole 314 or the second locking hole, so that the entire adjusting assembly 73 is locked and cannot rotate.

[0136] In this embodiment, when switching between single and double-rider vehicle modes, the unlocking lever 735 is first operated to unlock the locking tongue 731 from the rear support rod 31. Then, the adjusting component 73 rotates around the pivot 733 to extend or retract the extension rod 32, thereby changing the wheelbase between the front wheel 2 and the rear wheel 4. Simultaneously, the basket rod 9 follows suit to maintain its posture. Afterward, the unlocking lever 735 is released, and the locking tongue 731 is locked back into the rear support rod 31, thus completing the entire switching process. This embodiment has a simple structure, convenient adjustment process, and is easy to operate, enabling rapid switching between single and double-rider vehicle modes and saving user time. Of course, in other embodiments, the unlocking structure is not limited to the unlocking lever 735, pull rope 736, and elastic element described in this embodiment; a telescopic rod or other structure can also be used, as long as it can control the extension and retraction of the locking tongue 731.

[0137] Optionally, the rear support 3 further includes an inner sleeve 33, which is fixed inside the rear support rod 31. The extension rod 32 is slidably connected inside the inner sleeve 33. The inner sleeve 33 is provided with a first fixing hole 331 and a second fixing hole 332, wherein the first fixing hole 331 corresponds to the position of the first locking hole 314, and the second fixing hole 332 corresponds to the position of the second locking hole. When the adjusting component 73 is rotated to the first position, the locking tongue 731 can pass through the first locking hole 314 and the first fixing hole 331 in sequence to lock with the rear support 3; when the adjusting component 73 is rotated to the second position, the locking tongue 731 can pass through the second locking hole and the second fixing hole 332 in sequence to lock with the rear support 3. In this embodiment, by setting the inner sleeve 33, the sliding of the extension rod 32 relative to the rear support rod 31 is smoother, and the locking of the locking tongue 731 with the rear support 3 is more reliable. Optionally, the extension rod 32 is also provided with a guide groove 322, which extends along the axial direction of the extension rod 32. Meanwhile, the inner sleeve 33 is provided with a sliding part, which is slidably connected to the guide groove 322, thereby further increasing the sliding stability between the inner sleeve 33 and the extension rod 32.

[0138] Optionally, in this embodiment, a first connecting ear 7321 is provided on the back of the housing 732, and the lower end of the support rod 6 is hinged to the first connecting ear 7321 around the second axis 722, which can improve the connection reliability between the adjustment component 73 and the support rod 6. Further, a second connecting ear 50 is provided on the push rod 5, and the upper end of the support rod 6 is hinged to the second connecting ear 50 around the first axis 51, which can improve the connection reliability between the support rod 6 and the push rod 5, thereby increasing the safety of the trolley.

[0139] Furthermore, to facilitate user operation, a handrail 10 is provided above and behind the push rod 5 in this embodiment. The handrail 10 is slidably connected to the push rod 5, and can be pulled outward or retracted inward relative to the push rod 5. When the trolley is switched to a two-seater mode, pulling out the handrail 10 further increases the length of the trolley, providing more space for the installation of two seats and making it easier for the user to push the trolley. Specifically, a latching structure is provided between the handrail 10 and the push rod 5. When the trolley is in normal single-seater or two-seater mode, the handrail 10 is latched and fixed to the push rod 5. When the length of the handrail 10 needs to be adjusted, the latching structure is unlocked, and the handrail 10 can be pulled outward or pushed inward.

[0140] Example 4

[0141] This embodiment provides another type of trolley, including a front support 1, a front wheel 2, a rear support 3, a rear wheel 4, a push rod 5, and a support rod 6. The front support 1 is located on the front side of the vehicle body, and the front wheel 2 is mounted on the bottom of the front support 1. The rear support 3 is located on the rear side of the vehicle body, and the rear support 3 includes a rear support rod 31 rotatably connected to the front support 1 and an extension rod 32 rotatably connected to the rear support rod 31. The rear wheel 4 is mounted on the end of the extension rod 32 away from the rear support rod 31. The push rod 5 is rotatably connected to at least one of the front support 1 and the rear support 3, and the push rod 5 facilitates the user to push the trolley. The support rod 6 is supported between the push rod 5 and the rear support rod 31. The upper end of the support rod 6 rotates relative to the push rod 5 about a first axis 51, and the lower end of the support rod 6 rotates relative to the rear support rod 31 about a second axis 722. The trolley has a first usage state and a second usage state. When switching from the first usage state to the second usage state, the rear support rod 31 rotates away from the front support 1, and the wheelbase between the rear wheel 4 and the front wheel 2 increases. At the same time, the extension rod 32 rotates to a position that increases the length of the rear support rod 31 in the extension direction. The second axis 722 moves downward relative to the front support 51 or the first axis 51 moves upward relative to the front support 51 or the support rod 6 slides and retracts to adapt to the change in the trolley's state. This ensures that the tilt angle of the front support 1 remains unchanged during the process of changing the wheelbase, thus guaranteeing good support and improving the safety of using the trolley.

[0142] In this embodiment, the extension rod 32 is rotatably connected to the rear support rod 31. By rotating the extension rod 32, the overall length of the rear support 3 can be extended or shortened. For example, the extension rod 32 and the rear support rod 31 can be connected by a folding rod structure, a hinge structure, or a scissor telescopic structure, so that the extension rod 32 can extend or retract relative to the rear support rod 31 during rotation.

[0143] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A trolley, characterized in that, include: The front bracket has a front wheel at its bottom; The rear support includes a rear support rod rotatably connected to the front support and an extension rod slidably connected to the rear support rod, wherein a rear wheel is provided at the end of the extension rod away from the rear support rod; The push rod is rotatably connected to at least one of the front bracket and the rear bracket; A support rod is provided between the push rod and the rear support rod. The first end of the support rod rotates relative to the push rod about a first axis, and the second end of the support rod rotates relative to the rear support rod about a second axis. The trolley has a first use state and a second use state. When switching from the first use state to the second use state, the rear support rod rotates away from the front support, and the wheelbase between the rear wheel and the front wheel increases. The extension rod slides away from the rear support rod along the extension direction of the rear support rod. The second axis moves downward relative to the first axis, or the support rod slides and retracts.

2. The trolley according to claim 1, characterized in that, The first end of the support rod is rotatably mounted on the push rod, and a rotating component is rotatably mounted on the rear support rod. The second end of the support rod is rotatably mounted on the rotating component around the second axis. When switching from the first use state to the second use state, the rotating component rotates the second end of the support rod to make the second axis move downward.

3. The trolley according to claim 2, characterized in that, The trolley also has a linkage component disposed between the rotating component and the extension rod, the linkage component being rotatably connected to the rotating component and the extension rod respectively; When switching from the first use state to the second use state, the rotating component is rotated, and the linkage component drives the extension rod to slide in a direction away from the rear support rod. At the same time, the second end of the support rod flips downward with the rotating component.

4. The trolley according to claim 3, characterized in that, The rotating member rotates relative to the rear support rod along the third axis. The rotating member has a body and a first connecting part and a second connecting part extending outward from the body. The first connecting part and the second connecting part extend in different directions. The third axis is located on the body. The support rod rotates relative to the first connecting part via the second axis, and the linkage is rotatably mounted on the second connecting part.

5. The trolley according to claim 4, characterized in that, With the third axis as the center, the front-back direction is the X direction, and the up-down direction is the Y direction, forming four quadrants. The rearward direction is the positive direction, and the upward direction is the positive direction. In the first use state, the second axis is located in the first quadrant, and in the second use state, the second axis is located in the third quadrant.

6. The trolley according to claim 4, characterized in that, The trolley also includes a control lever for rotating the rotating component. The control lever is located at the second connecting part and extends from the second connecting part toward the inside of the frame.

7. The trolley according to claim 6, characterized in that, The rear support is provided in pairs and arranged side by side in the left and right direction. Each of the rear support rods is rotatably mounted with a rotating component. The control lever is connected and fixed between the two rotating components and drives the two rotating components to rotate synchronously so as to realize the synchronous movement of the two extension rods.

8. The trolley according to claim 6, characterized in that, The trolley has a rotation locking structure and a rotation unlocking structure for locking the rotating member to the rear support rod. The rotation locking structure includes a locking block disposed on one of the rear support rod and the rotating member and a locking hole disposed on the other. In the first use state, the lock block slides to the keyhole to restrict the rotation of the rotating member. The rotary unlocking structure is linked with the lock block and moves between the unlocked position and the locked position. In the locked position, the lock block is positioned in the keyhole. In the unlocked position, the lock block disengages from the keyhole.

9. The trolley according to claim 8, characterized in that, The lock hole is located on the rear support rod, the lock block is slidably mounted on the rotating member, and the rotation unlocking structure includes an unlocking member movably mounted on the control lever and an unlocking linkage mechanism that links the unlocking member and the lock block.

10. The trolley according to claim 9, characterized in that, The unlocking component is sleeved on the control lever and rotates in the circumferential direction of the control lever to the unlocking position and the locked position. The unlocking linkage mechanism includes a sliding rod that moves along the extension direction of the control lever, a guide post that extends in the radial direction of the sliding rod, and an oblique groove disposed on the unlocking component. The oblique groove is oblique to the movement direction of the sliding rod. The guide post is located in the oblique groove and can slide along the oblique groove. When the unlocking component moves toward the unlocking position, the guide post slides along the oblique groove and drives the sliding rod to move away from the rotating component. The locking block is linked with the sliding rod to move toward the position of disengaging from the lock hole.

11. The trolley according to claim 8, characterized in that, The lock hole includes a first locking hole and a second locking hole provided on the rear support rod. In the first use state, the lock block is locked with the first locking hole, and in the second use state, the lock block is locked with the second locking hole. The first locking hole is located above the second locking hole in the vertical direction.

12. The trolley according to claim 1, characterized in that, The first end of the support rod is rotatably mounted on the push rod, and the second end of the support rod can slide relative to the rear support rod. When switching from the first use state to the second use state, the support rod slides along the rear support rod in the direction that causes the second axis to move downward.

13. The trolley according to claim 12, characterized in that, The trolley also has a sliding linkage mechanism disposed between the extension rod and the support rod. When the extension rod moves away from the rear support rod, the sliding linkage mechanism drives the support rod to slide downward along the second axis.

14. The trolley according to claim 13, characterized in that, The support rod is provided with a sliding column that is slidably disposed on the rear support rod. The sliding column extends in a direction parallel to the second axis. The rear support rod is provided with a sliding adapter part that is adapted to the sliding column. The sliding adapter is a first movable slide groove formed on the rear support rod; the first movable slide groove has a first end and a second end, and when switching from the first use state to the second use state, the second axis of the support rod moves from the first end to the second end, and the height of the first end in the vertical direction is higher than that of the second end; The sliding linkage mechanism cooperates with the sliding column so that when the extension rod moves away from the rear support rod, the sliding linkage mechanism drives the sliding column to move from the first end to the second end.

15. The trolley according to claim 14, characterized in that, The rear support rod is sleeved outside the extension rod, and the sliding linkage mechanism includes a first oblique guide groove disposed on the extension rod. The extension direction of the first oblique guide groove is obliquely intersecting the sliding direction of the extension rod. The sliding column is simultaneously slidably disposed in the first oblique guide groove and the first moving groove. The extension rod has a stretching direction that slides away from the rear support rod and a shortening direction that slides towards the rear support rod, and the first oblique guide groove is inclined away from the stretching direction of the extension rod.

16. The trolley according to claim 1, characterized in that, The lower end of the push rod is rotatably connected to the upper end of the front support via a fourth axis. The front support, the push rod, the support rod, and the rear support rod form a four-bar linkage mechanism so that the trolley can be folded in both the first and second use states.

17. The trolley according to claim 1, characterized in that, The trolley also includes an adjustment assembly, which is plate-shaped and supported between the two rear support rods. The adjustment assembly is rotatably mounted to the rear support rods via a pivot. The first end of the support rod is rotatably mounted to the push rod, and the second end of the support rod is rotatably mounted to the back of the adjustment assembly via a second axis. The pivot is located below the second axis. When switching from the first use state to the second use state, the adjustment assembly flips with the second end of the support rod to move the second axis downward. The adjustment assembly includes a housing and a locking tongue for locking with the rear support rod. The locking tongue is movably disposed within the housing. The rear support rod is provided with a first locking hole and a second locking hole. The first locking hole and the second locking hole are arranged along the extension direction of the rear support rod and are respectively located on both sides of the rotating shaft. In a first use state, the locking tongue is locked in the first locking hole. In a second use state, the locking tongue is locked in the second locking hole. The first locking hole is located above the rotating shaft, and the second locking hole is located below the rotating shaft.

18. The trolley according to claim 17, characterized in that, In the first use state, the back of the adjustment component is positioned facing out of the vehicle body; in the second use state, the back of the adjustment component is rotated to face inwards towards the vehicle body.

19. The trolley according to claim 17, characterized in that, The rear support also includes an inner sleeve, which is fixed inside the rear support rod, and the extension rod is slidably connected inside the inner sleeve; the extension rod is provided with a guide groove, which extends along the axial direction of the extension rod, and the inner sleeve is provided with a sliding part, which is slidably connected to the guide groove.

20. A trolley, characterized in that, include: The front bracket has a front wheel at its bottom; The rear support includes a rear support rod rotatably connected to the front support and an extension rod rotatably connected to the rear support rod, wherein a rear wheel is provided at the end of the extension rod away from the rear support rod; The push rod is rotatably connected to at least one of the front bracket and the rear bracket; A support rod is provided between the push rod and the rear support rod. The first end of the support rod rotates relative to the push rod about a first axis, and the second end of the support rod rotates relative to the rear support rod about a second axis. The trolley has a first use state and a second use state. When switching from the first use state to the second use state, the rear support rod rotates away from the front support, and the wheelbase between the rear wheel and the front wheel increases. The extension rod is rotated to a position that increases the length of the rear support rod in the extension direction; The second axis moves downward relative to the first axis, or the support rod slides and retracts.

21. A trolley, characterized in that, include: The front bracket has a front wheel at its bottom; The rear support includes a rear support rod rotatably connected to the front support and an extension rod movably connected to the rear support rod, wherein a rear wheel is provided at the end of the extension rod away from the rear support rod; The push rod is rotatably connected to at least one of the front bracket and the rear bracket; A support rod is provided between the rear support rod and the push rod; the first end of the support rod rotates relative to the push rod about a first axis, and the second end of the support rod rotates relative to the rear support rod about a second axis. The trolley has a first use state and a second use state. When switching from the first use state to the second use state, the rear support rod rotates away from the front support, and the wheelbase between the rear wheel and the front wheel increases. The extension rod moves toward extending the rear support rod; The second axis moves downward relative to the first axis, or the support rod slides and retracts.

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