Cart

Abstract

The invention relates to a cart which comprises a foldable bottom frame and a push rod frame movably connected with the bottom frame, when the cart is in an unfolded state, the push rod frame has a first use state in which the push rod frame obliquely extends upwards from front to back and a second use state in which the push rod frame obliquely extends upwards from back to front, when the push rod frame is in the first use state and the second use state, the push rod frame can be arranged in a turnover and sliding mode relative to the bottom frame, and when the push rod frame moves relative to the bottom frame, the push rod frame can be folded relative to the bottom frame and drive the bottom frame to be folded. Therefore, the cart with the reversing function is more convenient to operate when being folded, and convenience is brought to a user.

Description

Technical Field

[0001] This invention relates to a trolley, and more particularly to a trolley with a reversible push rod. Background Technology

[0002] To meet consumers' demand for two-way push-pull trolleys, some trolleys on the market currently feature reversible push rods. However, when folding or unfolding these trolleys, the push rod frame often needs to be moved to a specific position first, and then the main frame needs to be folded or unfolded. In other words, folding or unfolding the trolley often requires multiple steps, which causes inconvenience for users in their daily use. Summary of the Invention

[0003] The purpose of this invention is to provide a trolley whose push rod can be used in different directions and can be folded in different usage states, with few folding steps and convenient operation.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a trolley having an unfolded state and a folded state, the trolley including a foldable base frame and a push rod frame movably connected to the base frame. When the trolley is in the unfolded state, the push rod frame has a first use state extending from front to back and upward, and a second use state extending from back to front and upward. In both the first use state and the second use state, the push rod frame can be flipped and slid relative to the base frame, and when the push rod frame moves relative to the base frame, it can retract relative to the base frame and drive the base frame to fold, so that the trolley can be converted from the unfolded state to the folded state.

[0005] In some embodiments, the base frame includes a front support, a rear support, and a linkage assembly. The upper part of the front support is rotatably connected to the upper part of the rear support. When the base frame is unfolded, the linkage assembly is connected between the front support and the rear support. When the base frame is folded, the front support and the rear support retract in the front-rear direction, and the linkage assembly is folded between the front support and the rear support. In the first use state, the push rod frame is supported between the linkage assembly and the rear support; in the second use state, the push rod frame is supported between the linkage assembly and the front support.

[0006] In some embodiments, when the push rod holder is in the first use state, the lower part of the push rod holder is rotatably connected to the linkage assembly, and the push rod holder and the rear support are slidably and rotatably connected relative to each other; when the push rod holder is in the second use state, the lower part of the push rod holder is rotatably connected to the linkage assembly, and the push rod holder and the front support are slidably and rotatably connected relative to each other.

[0007] In some embodiments, the push rod holder includes a push rod and a connector disposed on the push rod. A first engaging member is provided on the rear support, and a second engaging member is provided on the front support. In the first use state, the connector and the first engaging member cooperate to restrict the connector from separating from the first engaging member in the radial direction of the connector, and the first engaging member is capable of relative sliding with the connector in the axial direction of the connector. In the second use state, the connector and the second engaging member cooperate to restrict the connector from separating from the second engaging member in the radial direction of the connector, and the second engaging member is capable of relative sliding with the connector in the axial direction of the connector.

[0008] In some embodiments, the connector is provided with a guide portion that extends along the length of the push rod frame, the first coupling is provided with a first sliding portion, and the second coupling is provided with a second sliding portion, wherein the first sliding portion and the second sliding portion are respectively provided to slidably engage with the guide portion.

[0009] In some embodiments, the connector is further provided with a first mating portion and a second mating portion. The first mating portion and the first sliding portion are configured to cooperate with each other to restrict the first sliding portion from disengaging from the guide portion. The second mating portion and the second sliding portion are configured to cooperate with each other to restrict the second sliding portion from disengaging from the guide portion.

[0010] In some embodiments, the guide portion is a guide groove extending along the length direction of the push rod frame, the first mating portion and the second mating portion are respectively open grooves communicating with the guide groove, the first sliding portion and the second sliding portion respectively include a column rod and a limiting end located at the outer end of the column rod, the opening size of the open groove is smaller than the size of the limiting end to restrict the limiting end from disengaging from the guide groove; under the action of external force, the size of the open groove can be deformed and increased to allow the limiting end to disengage from the guide groove.

[0011] In some embodiments, the connector is fixed to the push rod, and the first mating portion and the second mating portion are spaced apart on the connector along the length direction of the push rod. The first mating portion and the second mating portion are disposed on opposite side walls of the guide groove. The push rod frame is rotatably connected to the connecting rod assembly about a rotation axis. The first sliding portion is disposed on the movement path of the first mating portion when the push rod frame rotates backward about the rotation axis, and the second sliding portion is disposed on the movement path of the second mating portion when the push rod frame rotates forward about the rotation axis.

[0012] In some embodiments, the push rod and the connector each have two sets disposed on the left and right sides, and the base frame is located between the two sets of connectors in the left-right direction.

[0013] In some embodiments, the linkage assembly includes a first link and a second link, one end of the first link being rotatably connected to the front support, one end of the second link being rotatably connected to the rear support, the other end of the first link being rotatably connected to the other end of the second link, and the lower part of the push rod holder being rotatably connected to the first link or rotatably connected to the second link.

[0014] In some embodiments, the base frame further includes a seat assembly, the seat assembly including a seat post and a slider, the seat post being rotatably connected to the first link or the second link, or the seat post being rotatably connected to the first link and the second link about the same rotation center line; the slider is rotatably connected to the front support, and the seat post is slidably connected to the slider.

[0015] In some embodiments, the front part of the first connecting rod is rotatably connected to the front support about a first axis, the rear part of the second connecting rod is rotatably connected to the rear support about a second axis, and the rear part of the first connecting rod and the front part of the second connecting rod are rotatably connected about a third axis. The lower part of the push rod holder is rotatably connected to the first connecting rod about a rotation axis, and the rotation axis and the first axis are located on opposite sides of the third axis. Alternatively, the lower part of the push rod holder is rotatably connected to the second connecting rod about a rotation axis, and the rotation axis and the second axis are located on opposite sides of the third axis.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The trolley provided by the present invention has a push rod frame that can be used in reverse. Regardless of whether the push rod frame is in the first use state or the second use state, in the process of driving the push rod frame to move relative to the base frame and retract relative to the base frame, the base frame itself can be folded, thereby enabling the trolley to change from an unfolded state to a folded state. This makes the trolley with the reversible function more convenient to operate when folding, bringing convenience to the user. Attached Figure Description

[0017] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a three-dimensional structural diagram of a trolley in its unfolded state according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the front support and front wheel assembly in a trolley;

[0020] Figure 3 for Figure 1 A schematic diagram of the structure of the rear support frame and rear wheel assembly in the trolley;

[0021] Figure 4 for Figure 1 A schematic diagram of the push rod and connecting parts on the push rod frame of the trolley;

[0022] Figure 5 for Figure 1 A schematic diagram of the connecting parts on the push rod frame of the trolley;

[0023] Figure 6 for Figure 1 A schematic diagram of the seat post and sliding component of the seat assembly in a trolley;

[0024] Figure 7 for Figure 1 A three-dimensional structural diagram of the trolley in its unfolded state, wherein the push rod frame is in its first usage state;

[0025] Figure 8 for Figure 7 A side view of the trolley's structure;

[0026] Figure 9 for Figure 7 A schematic diagram of the push rod frame in the trolley after it has been folded up;

[0027] Figure 10 for Figure 9 A side view of the trolley's structure;

[0028] Figure 11 for Figure 7 A schematic diagram of the structure of the cart when it is transitioning between the unfolded and folded states;

[0029] Figure 12 for Figure 11 A side view of the trolley's structure;

[0030] Figure 13 for Figure 7 A schematic diagram of the trolley in a folded state;

[0031] Figure 14 for Figure 13 A side view of the trolley's structure;

[0032] Figure 15 for Figure 1 A three-dimensional structural diagram of the trolley in its unfolded state, wherein the push rod frame is in its second usage state;

[0033] Figure 16 for Figure 15 A side view of the trolley's structure;

[0034] Figure 17 for Figure 15 A schematic diagram of the push rod frame in the trolley after it has been folded up;

[0035] Figure 18 for Figure 17 A side view of the trolley's structure;

[0036] Figure 19 for Figure 15 A schematic diagram of the structure of the cart when it is transitioning between the unfolded and folded states;

[0037] Figure 20 for Figure 19 A side view of the trolley's structure;

[0038] Figure 21 for Figure 15 A schematic diagram of the trolley in a folded state;

[0039] Figure 22 for Figure 21 A side view of the trolley's structure;

[0040] In the attached diagrams above:

[0041] 1. Push rod bracket; 11. Push rod; 12. Connector; 121. First mating part; 122. Second mating part; 123. Guide part; 124. Adapter part; 13. Push handle;

[0042] 2. Front bracket; 21. Front support rod; 22. Second connecting piece; 22a. Second column; 22b. Second limiting end; 22c. Second connecting piece; 23. Front crossbar;

[0043] 3. Rear bracket; 31. Rear support rod; 32. First connecting piece; 32a. First column; 32b. First limiting end; 32c. First connecting piece; 33. Rear crossbar;

[0044] 4. First link; 5. Second link; 6. Seat assembly; 61. Seat post; 62. Sliding element; 63. Backrest;

[0045] 20. Front wheel assembly; 30. Rear wheel assembly. Detailed Implementation

[0046] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] In this article, the terms "up," "down," "left," and "right," etc., indicate the direction or positional relationship as follows: Figure 1 The orientation of the occupant as observed when seated on seat assembly 6 is defined for reference only for the purpose of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] Referring to the accompanying drawings, a trolley has an unfolded state and a folded state. The trolley includes a foldable base frame and a push rod frame 1 movably connected to the base frame. When unfolded, the base frame supports the ground and provides support for a passenger. The push rod frame 1 is used by the user to grip and push the trolley. In the unfolded state, the base frame unfolds and supports the ground; the push rod frame 1 has a first usage state where it gradually tilts upwards and backwards. Figure 7 , Figure 8 As shown, and the second usage state extending from back to front and upward, as... Figure 15 , Figure 16 As shown. The first usage state is also called the forward usage state, in which the occupant supported by the base frame faces away from the pusher; the second usage state is also called the reverse usage state, in which the occupant supported by the base frame faces the pusher.

[0049] In this trolley, the push rod frame 1, in both its first and second use states, can be rotated and slid relative to the base frame. Furthermore, when the push rod frame 1 moves relative to the base frame, it can retract relative to the base frame and cause the base frame itself to fold, thus transforming the trolley from an unfolded state to a folded state. In other words, when the trolley is in the unfolded state, regardless of whether the push rod frame 1 is in the first or second use state, it can drive the push rod frame 1 to move relative to the base frame, causing the push rod frame 1 and the base frame to retract towards each other. Simultaneously, the push rod frame 1 can also cause the base frame itself to fold, thus enabling the trolley to transition from an unfolded to a folded state. Therefore, when folding the trolley, only the movement of the push rod frame relative to the base frame is required, simplifying the folding operation.

[0050] Specifically, see Figures 1 to 22As shown, the base frame includes a front support 2, a rear support 3, and a connecting rod assembly. The upper part of the front support 2 is rotatably connected to the upper part of the rear support 3, and the connecting rod assembly is connected between the front support 2 and the rear support 3. A front wheel assembly 20 is provided at the bottom of the front support 2, and a rear wheel assembly 30 is provided at the bottom of the rear support 3. When the base frame is folded, the front support 2 and the rear support 3 are retracted in the front-to-back direction, and the connecting rod assembly is retracted between the front support 2 and the rear support 3. In this embodiment, when the push rod frame 1 is in the first use state, the push rod frame 1 is supported between the connecting rod assembly and the rear support 3, and its overall shape is gradually inclined and extended backward and upward; when the push rod frame 1 is in the second use state, the push rod frame 1 is supported between the connecting rod assembly and the front support 2, and its overall shape is gradually inclined and extended forward and upward.

[0051] Specifically, when the push rod frame 1 is in the first use state, the lower part of the push rod frame 1 is rotatably connected to the linkage assembly, and the push rod frame 1 and the rear support 3 can be slidably and rotatably connected. Thus, when the push rod frame 1 flips relative to the base frame, the push rod frame 1 and the rear support 3 flip relative to each other, and drive the linkage assembly to move and fold in the front-back direction. This causes the distance from the lower part of the push rod frame 1 to its connection position with the rear support 3 to change. The push rod frame 1 then slides relative to the rear support 3 and gradually folds relative to the rear support 3. At the same time, the folding of the linkage assembly in the front-back direction causes the front support 2 and the rear support 3 to gradually fold in the front-back direction, so that the trolley changes from the unfolded state to the folded state. When the push rod frame 1 is in the second use state, the lower part of the push rod frame 1 is rotatably connected to the linkage assembly, and the push rod frame 1 and the front support 2 are slidably and rotatably connected. When the push rod frame 1 flips relative to the base frame, the push rod frame 1 and the front support 2 flip relative to each other, and drive the linkage assembly to move and fold in the front and back direction, so that the push rod frame 1 further slides relative to the front support 2 and retracts with the front support 2. At the same time, the front support 2 and the rear support 3 gradually retract in the front and back direction, so that the trolley changes from the unfolded state to the folded state.

[0052] In other words, in this embodiment, the push rod frame 1 is in a first use state while maintaining a rotatable connection with the connecting rod assembly, and is further connected to the rear support 3. When it is disconnected from the rear support 3 and further connected to the front support 2, it is converted to a second use state. Whether the push rod frame 1 is in the first use state or the second use state, when the push rod frame 1 is driven to flip, it can be linked to fold the base frame, and the push rod frame 1 is folded to the rear side of the rear support 3 connected to it, or folded to the front side of the front support 2 connected to it.

[0053] Referring to the accompanying drawings, the push rod holder 1 includes a push rod 11 and a connector 12 disposed on the push rod 11. A first engaging member 32 is provided on the rear support 3, and a second engaging member 22 is provided on the front support 2. In a first operating state, the connector 12 and the first engaging member 32 cooperate to restrict the connector 12 from separating from the first engaging member 32 along the radial direction of the connector 12. The first engaging member 32 is capable of relative sliding with the connector 12 along the axial direction of the connector 12. In a second operating state, the connector 12 and the second engaging member 22 cooperate to restrict the connector 12 from separating from the second engaging member 22 along the radial direction of the connector 12. The second engaging member 22 is capable of relative sliding with the connector 12 along the axial direction of the connector 12. The connector 12 can cooperate or disengage with the first engaging member 32 and the second engaging member 22, allowing the push rod holder 1 to switch between the first and second operating states.

[0054] Specifically, the connector 12 is provided with a guide portion 123, which extends along the length of the push rod frame 1. The first connecting member 32 is provided with a first sliding portion, and the second connecting member 22 is provided with a second sliding portion. The first sliding portion and the second sliding portion are respectively provided in sliding engagement with the guide portion 123. The connector 12 is also provided with a first mating portion 121 and a second mating portion 122. The first mating portion 121 is provided in engagement with the first sliding portion to prevent the first sliding portion from disengaging from the guide portion 123; the second mating portion 122 is provided in engagement with the second sliding portion to prevent the second sliding portion from disengaging from the guide portion 123.

[0055] In this embodiment, the guide part 123 is a guide groove extending along the length direction of the push rod frame 1. The first mating part 121 and the second mating part 122 are respectively open grooves communicating with the guide groove. The first sliding part and the second sliding part can enter the guide groove through the corresponding open groove and slide along the guide groove, or be pushed out of the guide groove through the corresponding open groove, thereby disengaging from the connection with the connector 12.

[0056] In this embodiment, the connector 12 is fixedly mounted on the push rod 11. A first mating part 121 and a second mating part 122 are spaced apart on the connector 12 along the length of the push rod 11. The first mating part 121 and the second mating part 122 are located on opposite side walls of the guide groove. The push rod frame 1 is rotatably connected to the connecting rod assembly around the rotation axis 100. A first sliding part is located on the movement path of the first mating part 121 when the push rod frame 1 rotates backward around the rotation axis 100, and a second sliding part is located on the movement path of the second mating part 122 when the push rod frame 1 rotates forward around the rotation axis 100. Thus, when the base frame is in the unfolded state, the push rod frame 1 rotates around the rotation axis 100, allowing the first mating part 121 to correspond to the first sliding part, or the second mating part 122 to correspond to the second sliding part, thereby switching the usage state of the push rod frame 1. Simultaneously, when the push rod frame 1 is in the corresponding usage state, the corresponding first or second sliding part can slide and engage with the guide part 123. In other embodiments, the connector 12 can be slidably disposed on the push rod 11. When the push rod frame 1 is used in reverse, the position of the connector 12 on the push rod 11 can be adjusted so that the positions of the first mating part 121 and the second mating part 122 can change so that they can cooperate with the corresponding first connecting part 32 or the second connecting part 22.

[0057] In this embodiment, both the push rod 11 and the connector 12 have two sets respectively located on the left and right sides. The base frame is located between the two sets of connectors 12 along the left-right direction. Correspondingly, both the first coupling member 32 and the second coupling member 22 have two sets respectively located on the left and right sides to cooperate with the connectors 12 on both sides. Specifically, see Figures 1 to 3 As shown, in this embodiment, the front support 2 includes two front support rods 21 respectively disposed on the left and right sides and extending in the vertical direction, and a front crossbar 23 fixed between the lower parts of the two front support rods 21. A front wheel assembly 20 is provided at the lower part of each of the two front support rods 21, and a second connecting member 22 is provided at the upper part of each of the two front support rods 21. The rear support 3 includes two rear support rods 31 respectively disposed on the left and right sides and extending in the vertical direction, and a rear crossbar 33 fixed between the lower parts of the two rear support rods 31. A rear wheel assembly 30 is installed on the outer sides of each end of the rear crossbar 33. The upper part of each support rod 31 is provided with a first connecting member 32; the push rod frame 1 includes two push rods 11 respectively located on the left and right sides, and the lower part of each push rod 11 is provided with a connecting member 12. The connecting member 12 is sleeved on the lower part of the push rod 11 and fixed to the push rod 11. The lower part of the connecting member 12 is provided with a transition part 124, which is rotatably connected to the connecting rod assembly through the transition part 124; the push rod frame 1 also includes a U-shaped push handle 13. The lower parts of the two sides of the push handle 13 are rotatably connected to the upper parts of the corresponding push rods 11, so that the push rod frame 1 itself can be folded along the length direction.

[0058] The first sliding portion on the first connecting member 32 has a similar structure to the second sliding portion on the second connecting member 22. Both are guide posts, specifically including a post and a limiting end located at the outer end of the post. The opening size of the slot is smaller than the size of the limiting end to prevent the limiting end from disengaging from the guide slot. Simultaneously, under the action of external force, the size of the slot can deform and increase, thereby allowing the limiting end to disengage from the guide slot. Specifically, see... Figure 3 As shown, the first connecting member 32 includes a first connecting piece 32c extending forward from the rear support rod 31, a first column 32a extending outward from the first connecting piece 32c in a left-right direction, and a first limiting end 32b disposed at the outer end of the first column 32a. The outer diameter of the first limiting end 32b is larger than the outer diameter of the first column 32a. The first column 32a and the first limiting end 32b together constitute a first sliding part that cooperates with the guide portion 123. The guide groove of the guide portion 123 allows the first column 32a to slide into the middle, and its two sides form a limiting structure that bends inward to cooperate with the first limiting end 32b to limit the first limiting end 32b, so that the first limiting end 32b slides within it. The first limiting end 32b can enter or exit the guide portion 123 via the first mating part 121. Similarly, see Figure 2 As shown, the second connecting member 22 includes a second connecting piece 22c extending rearward from the front support rod 21, a second column 22a extending outward from the second connecting piece 22c in a left-right direction, and a second limiting end 22b disposed at the outer end of the second column 22a. The outer diameter of the second limiting end 22b is larger than the outer diameter of the second column 22a. The second column 22a and the second limiting end 22b together constitute a second sliding part that cooperates with the guide part 123, and the guide groove can slide with the second limiting end 22b. The second limiting end 22b can enter or exit the guide part 123 via the second mating part 122.

[0059] Referring to the accompanying drawings, in this embodiment, the linkage assembly includes a first linkage 4 and a second linkage 5. Both the first linkage 4 and the second linkage 5 have two sets located on the left and right sides, respectively, and are foldable between the corresponding front support rod 21 and rear support rod 31 in the front-rear direction. Specifically, the front part of the first linkage 4 is rotatably connected to the front support rod 21 around the first axis 101, and the rear part of the second linkage 5 is rotatably connected to the rear support rod 31 around the second axis 102. The rear part of the first linkage 4 and the front part of the second linkage 5 are rotatably connected around the third axis 103. The lower part of the push rod frame 1 is rotatably connected to the first linkage 4 or the second linkage 5. When the push rod frame 1 flips relative to the front support 2 or the rear support 3, the lower end of the push rod frame 1 will move upwards, driving the end of the first linkage 4 or the second linkage 5 connected to it to move upwards, thereby causing the first linkage 4 and the second linkage 5 to rotate relative to each other, and consequently causing the front support 2 and the rear support 3 to rotate relative to each other and gradually retract in the front-rear direction. Here, the connector 12 at the lower part of the push rod holder 1 is rotatably connected to the front part of the second connecting rod 5 about a rotation axis 100, and the rotation axis 100 and the second axis 102 are located on opposite sides of the third axis 103. In other embodiments, the connector 12 can also be rotatably connected to the rear part of the first connecting rod 4 about a rotation axis 100, such that the rotation axis 100 and the first axis 101 are located on opposite sides of the third axis 103.

[0060] In this embodiment, the base frame also includes a seat assembly 6, which includes a seat post 61, a slider 62, and a backrest 63. The seat post 61 and slider 62 each have two sets located on the left and right sides. The lower part of the backrest 63 is rotatably connected to the rear parts of the seat posts 61 on both sides. On each side, the slider 62 is rotatably connected to the front support rod 21. The seat post 61 is slidably engaged with the slider 62 along its own length. The rear part of the seat post 61 is also rotatably connected to the first connecting rod 4 and the second connecting rod 5 around a third axis 103. In other embodiments, the rear part of the seat post 61 can also be rotatably connected to the first connecting rod 4 or the second connecting rod 5 via another pivot. During the relative rotation of the first connecting rod 4 and the second connecting rod 5, which drives the front support 2 and the rear support 3 to retract in the front-rear direction, the seat post 61 rotates and slides relative to the slider 62, thereby retracting between the front support 2 and the rear support 3.

[0061] In summary, see Figures 7 to 8 As shown, the trolley is in the unfolded state, and the push rod frame 1 is in the first use state. The connecting piece 12 at the lower part of the push rod frame 1 engages with the first engaging piece 32 on the rear support 3. The first limiting end 32b of the first engaging piece 32 enters the guide part 123 from the opening slot of the first mating part 121. When it is necessary to fold the trolley, see... Figure 9 , Figure 10As shown, first, the push handle 13 is rotated and folded relative to the push rod 11. Then, the backrest 63 is flipped backward, causing the entire push rod frame 1 to flip backward. At this time, the lower part of the push rod frame 1 is raised upward, causing the first connecting rod 4 and the second connecting rod 5 of the linkage assembly to rotate relative to each other and fold in the front-to-back direction. This causes the front support 2 and the rear support 3 to gradually close in the front-to-back direction. At the same time, the first limiting end 32b slides along the guide portion 123 on the connector 12, causing the push rod frame 1 to gradually close relative to the rear support 3. The seat rod 61 also gradually closes between the front support 2 and the rear support 3. Figure 11 , Figure 12 As shown. The final result is as follows. Figure 13 , Figure 14 As shown, the push rod bracket 1 is folded up behind the rear bracket 3.

[0062] See Figures 15 to 16 As shown, the trolley is in the unfolded state, and the push rod frame 1 is in the second use state. The connecting piece 12 at the lower part of the push rod frame 1 engages with the second engaging piece 22 on the front bracket 2. The second limiting end 22b of the second engaging piece 22 enters the guide part 123 from the opening slot of the second mating part 122. When it is necessary to fold the trolley, see... Figure 17 , Figure 18 As shown, first, the push handle 13 is rotated and folded relative to the push rod 11. Then, the backrest 63 is flipped backward, causing the push rod frame 1 to flip forward as a whole. At this time, the lower part of the push rod frame 1 is lifted upward, causing the first link 4 and the second link 5 of the linkage assembly to rotate relative to each other and fold in the front-to-back direction. This causes the front support 2 and the rear support 3 to gradually close in the front-to-back direction. At the same time, the second limiting end 22b slides along the guide portion 123 on the connector 12, causing the push rod frame 1 to gradually close relative to the front support 2. The seat rod 61 also gradually closes between the front support 2 and the rear support 3. Figure 19 , Figure 20 As shown. The final result is as follows. Figure 21 , Figure 22 As shown, the push rod bracket 1 is folded up to the front of the front bracket 2.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In the event of any contradiction or inconsistency between the definitions used herein and those contained in other published documents, the definitions used herein shall prevail.

[0064] It should be noted that "rotational connection" in the above embodiments refers to pivot connection, unless the context clearly indicates other rotational connection methods.

[0065] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0066] It is understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0067] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0068] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A trolley having an unfolded state and a folded state, characterized in that: The trolley includes a foldable base frame and a push rod frame movably connected to the base frame. When the trolley is in an unfolded state, the push rod frame has a first use state that extends from front to back and upward, and a second use state that extends from back to front and upward. In both the first and second use states, the push rod frame can be flipped and slid relative to the base frame. When the push rod frame moves relative to the base frame, it can retract relative to the base frame and drive the base frame to fold, so that the trolley can be converted from an unfolded state to a folded state.

2. The trolley according to claim 1, characterized in that: The base frame includes a front support, a rear support, and a linkage assembly. The upper part of the front support is rotatably connected to the upper part of the rear support. When the base frame is unfolded, the linkage assembly connects the front support and the rear support. When the base frame is folded, the front support and the rear support retract in the front-rear direction, and the linkage assembly folds between the front support and the rear support. When the push rod frame is in the first use state, the push rod frame is supported between the connecting rod assembly and the rear bracket; when the push rod frame is in the second use state, the push rod frame is supported between the connecting rod assembly and the front bracket.

3. The trolley according to claim 2, characterized in that: When the push rod holder is in the first use state, the lower part of the push rod holder is rotatably connected to the connecting rod assembly, and the push rod holder and the rear support are slidably and rotatably connected relative to each other; when the push rod holder is in the second use state, the lower part of the push rod holder is rotatably connected to the connecting rod assembly, and the push rod holder and the front support are slidably and rotatably connected relative to each other.

4. The trolley according to claim 3, characterized in that: The push rod holder includes a push rod and a connector disposed on the push rod. A first engaging member is provided on the rear bracket, and a second engaging member is provided on the front bracket. In the first use state, the connector and the first engaging member cooperate to restrict the connector from separating from the first engaging member in the radial direction of the connector, and the first engaging member can slide relative to the connector in the axial direction of the connector. In the second use state, the connector and the second engaging member cooperate to restrict the connector from separating from the second engaging member in the radial direction of the connector, and the second engaging member can slide relative to the connector in the axial direction of the connector.

5. The trolley according to claim 4, characterized in that: The connector is provided with a guide portion, which extends along the length of the push rod frame. The first connecting member is provided with a first sliding portion, and the second connecting member is provided with a second sliding portion. The first sliding portion and the second sliding portion are respectively provided to slide and cooperate with the guide portion.

6. The trolley according to claim 5, characterized in that: The connector is further provided with a first mating part and a second mating part. The first mating part and the first sliding part are configured to cooperate with each other to restrict the first sliding part from disengaging from the guide part. The second mating part and the second sliding part are configured to cooperate with each other to restrict the second sliding part from disengaging from the guide part.

7. The trolley according to claim 6, characterized in that: The guide portion is a guide groove extending along the length of the push rod frame. The first mating portion and the second mating portion are respectively open slots communicating with the guide groove. The first sliding portion and the second sliding portion each include a column rod and a limiting end located at the outer end of the column rod. The opening size of the open slot is smaller than the size of the limiting end to restrict the limiting end from disengaging from the guide groove. Under the action of external force, the size of the open slot can be deformed and increased to allow the limiting end to disengage from the guide groove.

8. The trolley according to claim 7, characterized in that: The connector is fixed to the push rod. The first mating part and the second mating part are spaced apart on the connector along the length direction of the push rod. The first mating part and the second mating part are disposed on the opposite side walls of the guide groove. The push rod frame is rotatably connected to the connecting rod assembly around the rotation axis. The first sliding part is disposed on the movement path of the first mating part when the push rod frame rotates backward around the rotation axis. The second sliding part is disposed on the movement path of the second mating part when the push rod frame rotates forward around the rotation axis. And / or, the push rod and the connector each have two sets located on the left and right sides, and the base frame is located between the two sets of connectors in the left-right direction.

9. The trolley according to claim 3, characterized in that: The linkage assembly includes a first linkage and a second linkage. One end of the first linkage is rotatably connected to the front support, and one end of the second linkage is rotatably connected to the rear support. The other end of the first linkage is rotatably connected to the other end of the second linkage. The lower part of the push rod frame is rotatably connected to the first linkage or rotatably connected to the second linkage.

10. The trolley according to claim 9, characterized in that: The base frame also includes a seat assembly, which includes a seat post and a slider. The seat post is rotatably connected to the first link or the second link, or the seat post is rotatably connected to the first link and the second link about the same rotation center line. The slider is rotatably connected to the front support, and the seat post is slidably connected to the slider.

11. The trolley according to claim 9, characterized in that: The front part of the first connecting rod is rotatably connected to the front bracket about a first axis, the rear part of the second connecting rod is rotatably connected to the rear bracket about a second axis, and the rear part of the first connecting rod and the front part of the second connecting rod are rotatably connected about a third axis. In one configuration, the lower part of the push rod frame is rotatably connected to the first connecting rod about a rotation axis, and the rotation axis and the first axis are located on opposite sides of the third axis; or, the lower part of the push rod frame is rotatably connected to the second connecting rod about a rotation axis, and the rotation axis and the second axis are located on opposite sides of the third axis.

12. A trolley having an unfolded state and a folded state, characterized in that: The trolley includes a foldable base frame and a push rod frame movably connected to the base frame. The base frame includes a front support, a rear support, and a linkage assembly. The upper parts of the front support and the rear support are rotatably connected. The linkage assembly is rotatably connected between the front support and the rear support and is configured to unfold and fold in the front-rear direction. The lower part of the push rod frame is rotatably connected to the linkage assembly. When the trolley is in its unfolded state, the push rod frame has a first usage state extending upwards from front to back, and a second usage state extending upwards from back to front. The push rod frame is equipped with a connector, the rear support has a first connecting member, and the front support has a second connecting member. In the first usage state, the connector and the first connecting member cooperate to allow the push rod frame and the rear support to slide and rotate relative to each other. In the second usage state, the connector and the second connecting member cooperate to allow the push rod frame and the front support to slide and rotate relative to each other. When the push rod frame rotates and retracts relative to the base frame, the push rod frame, in conjunction with the linkage assembly, folds along the front-back direction and relative to the base frame, thus transforming the trolley from an unfolded state to a folded state.

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