Cart

Abstract

To provide a cart making it possible to reduce a degree of difficulty of collapsing the cart, and diminishing a volume observed after collapsing a frame.SOLUTION: A rear leg frame of a cart is coupled to a handlebar frame so that the rear leg frame can pivot and forms a first pivotal point, and a front leg frame is coupled to the handlebar frame so that the front leg frame can pivot, and forms a second pivotal point. A collapsible mechanism includes a first link rod that is pivotally connected to the rear leg frame at a first pivot attachment point, a second link rod that is pivotally connected to the first link rod at a second pivot attachment point and pivotally connected to the front leg frame at a third pivot attachment point, and an interlocking rod that is attached to the first link rod at a first revolving point and to the front leg frame at a second revolving point. The second revolving point is interposed between the second pivotal point and the third pivot attachment point. The interlocking rod forces the first link rod to revolve, whereby a frame body can be changed between a collapsed condition and deployed condition.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] FIELD OF THE INVENTION This application relates to the field of wheeled transportation devices, and more particularly to carts. [Background technology]

[0002] In households with infants and young children, it has become common and convenient to use a cart as an auxiliary means of watching over the infant when going out with the infant.

[0003] To ensure practicality and convenience for users, carts generally include a folding mechanism for folding and unfolding the frame. To facilitate users' placement of personal belongings and reduce their burden, carts typically include a basket with storage space below the seat. However, because the folding of the frame and the folding of the basket often interact with each other, folding the cart or frame can be cumbersome, difficult, and requires a large volume after folding. Summary of the Invention [Problem to be solved by the invention]

[0004] In view of this, it is necessary to provide a cart that can improve the smoothness and convenience of folding the cart, reduce the difficulty of folding the cart, and reduce the volume of the frame after folding, in response to the above problems. [Means for solving the problem]

[0005] The cart includes a frame body and a folding mechanism. The frame body includes a front leg frame, a rear leg frame, and a handle frame, the rear leg frame being pivotally connected to the handle frame to form a first pivot point, and the front leg frame being pivotally connected to the handle frame to form a second pivot point.

[0006] The folding mechanism includes a first link rod, a second link rod, and an interlocking rod. The first link rod is pivotally connected to the rear leg frame at a first pivot point. The second link rod is pivotally connected to the first link rod at a second pivot point and is also pivotally connected to the front leg frame at a third pivot point. The interlocking rod is pivotally connected to the first link rod at the first pivot point and is also pivotally connected to the front leg frame at a second pivot point.

[0007] The second pivot point is located between the second pivot point and the third pivot point, and the link rod can switch the frame body between a folded state and an unfolded state by rotating the first link rod.

[0008] In one embodiment, a first end of the link rod is pivotally connected to the first link rod to form a first pivot point, the first pivot point being located between the first pivot point and the second pivot point.

[0009] In one embodiment, the first link rod is provided with a first position limiting portion, and the first position limiting portion can limit the pivot angle between the first link rod and the second link rod when the frame main body is folded by abutting against a side edge of the second link rod, And / or, the second link rod is provided with a second position limiting portion, which can abut against the side edge of the first link rod to limit the pivot angle between the first link rod and the second link rod when the frame body is folded.

[0010] In one embodiment, a first recess is provided at an end of the first link rod that is pivotally connected to the second link rod, and the first recess can at least partially accommodate the second link rod, and a first position limiting portion is formed by a side wall of the first recess, and the first position limiting portion can abut against a side edge of the second link rod; And / or, a second recess is provided at the end of the second link rod that pivots to the first link rod, and the second recess can at least partially accommodate the first link rod, and a second position limiting portion is formed by the side wall of the second recess, and the second position limiting portion can abut against the side edge of the first link rod.

[0011] In one embodiment, the rear leg frame includes a rear horizontal bar and two rear vertical bars each connected to both ends of the rear horizontal bar, and the front leg frame includes a front horizontal bar and two front vertical bars each connected to both ends of the front horizontal bar, When the frame body is in a folded state, the first link rod is parallel to the rear vertical bar, or the second link rod is parallel to the front vertical bar, and when the frame body is in an unfolded state, the first link rod and the second link rod are positioned on the same straight line.

[0012] In one embodiment, the first pivot point is located between the first pivot point and the second pivot point, and the link rod is recessed toward a side away from the second pivot point to form a retraction recess; When the frame body is in the folded state, the link rod is spaced apart from the second pivot point via the retracted recess.

[0013] In one embodiment, the first link rod is provided with a first fixed portion and the second link rod is provided with a second fixed portion, and the first fixed portion and the second fixed portion can each be connected to the basket cloth.

[0014] In one embodiment, the vehicle further includes a locking joint, the locking joint having a first connecting seat and a second connecting seat, the first connecting seat being connected to one of the handle frame and the front landing gear frame, and the second connecting seat being connected to the other of the handle frame and the front landing gear frame, wherein the first connecting seat and the second connecting seat are pivotally connected to define a second pivot point.

[0015] The cart further includes a seat assembly, the seat assembly being provided with a mounting seat, and the second connecting seat being provided with an engagement portion that protrudes in a direction away from the first connecting seat, the engagement portion being capable of engaging with the mounting seat.

[0016] In one embodiment, the locking joint is provided with a locking mechanism, which includes a locking member, a pushing member, and a lock-release member.

[0017] The locking member is movably provided within the first connection seat or the second connection seat so as to be switched between a locked position and an unlocked position, and when the locking member is in the locked position, the locking member engages with the first connection seat and the second connection seat, respectively, thereby restricting relative pivotal movement between the first connection seat and the second connection seat, and when the locking member is in the unlocked position, the locking member disengages from one of the first connection seat and the second connection seat, thereby allowing relative pivotal movement between the first connection seat and the second connection seat.

[0018] The push-up member is movably provided within the second connecting seat, and the push-up member can drive the locking member to move to the unlocked position by pushing up the locking member.

[0019] The unlocking member is pivotally provided in the second connecting seat, and is thereby capable of pushing up and moving the push-up member.

[0020] In one embodiment, after the engaging portion engages with the mounting seat, the unlocking member is shielded by the mounting seat. [Effects of the Invention]

[0021] According to the cart provided in the embodiment of the present invention, the first link rod is rotated by the link rod, and the second link rod pivotally connected to the first link rod is rotated to drive and pivot the front leg frame toward or away from the rear leg frame, and further switch the frame body between the folded state and the unfolded state. In this way, the cart can be quickly and smoothly folded, making it easier to fold and reducing the volume of the folded cart, making it easier to store and transport. [Brief explanation of the drawings]

[0022] The accompanying drawings, which form a part of this application, are used to further understand this application, and the schematic examples and descriptions thereof are used to interpret this application and are not intended to unduly limit this application.

[0023] In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings used in the embodiments of the present application will be briefly described below. It is obvious that the following attached drawings are only some embodiments of the present application, and those skilled in the art can derive other drawings from these drawings without expending inventive efforts.

[0024] Additionally, the drawings are not drawn to a 1:1 scale, and the relative dimensions of each element are depicted in the drawings for illustrative purposes only and are not necessarily drawn to true scale.

[0025] [Figure 1] 1 illustrates a side view of a cart according to one embodiment of the present application. [Figure 2] 2 shows an exploded view of the cart of FIG. 1. [Figure 3] 1 shows a side view of a frame body of a cart according to one embodiment of the present application, where the frame body is in an unfolded state. [Figure 4] 1 shows a side view of a frame body of a cart according to one embodiment of the present application, where the frame body is in a semi-folded state between an unfolded state and a folded state. [Figure 5]1 illustrates a cross-sectional view of a frame body of a cart according to one embodiment of the present application, where the frame body is in a folded state. [Figure 6] 1 shows an exploded schematic view of a folding mechanism of a cart according to one embodiment of the present application. [Figure 7] 1 shows an exploded schematic view of a folding mechanism of a cart according to an embodiment of the present application at a different viewing angle. [Figure 8] FIG. 3 is a partial cross-sectional view taken along line UU in FIG. 2. [Figure 9] 1 shows an exploded schematic view of a locking joint of a cart according to one embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0026] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described in more detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for interpreting the present application and do not limit the protection scope of the present application.

[0027] It should be noted that when an element is referred to as "fixed" to another element, it may be directly disposed on the other element, or there may be intervening elements. When an element is referred to as "connected" to another element, it may be directly connected to the other element, or there may be intervening elements. Terms such as "vertical," "horizontal," "left," "right," and similar terms used herein are for illustrative purposes only and do not represent the only embodiment.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terms used herein are for the purpose of describing specific embodiments only and are not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] 1 and 2 show a cart 1000 provided in one embodiment of the present application, and the overall structure of the cart 1000 is approximately symmetrical, and may include a frame body 100, a seat assembly 200, and a folding mechanism 300. Below, the cart 1000 will be described, along with the frame body 100, the seat assembly 200, and the folding mechanism 300.

[0030] 3 to 5, the frame body 100 of the cart 1000 may include a front leg frame 120, a rear leg frame 110, and a handle frame 130. The rear leg frame 110 is pivotally connected to the handle frame 130 to form a first pivot point X1 (also referred to as a first pivot axis X1), and the front leg frame 120 is pivotally connected to the handle frame 130 to form a second pivot point X2 (also referred to as a second pivot axis X2), thereby allowing the frame body 100 to be switched between an unfolded state and a folded state. In this way, the cart 1000 can be quickly and smoothly folded, reducing the difficulty of folding the cart 1000 and reducing the volume of the folded cart 1000, making it easier to store and transport.

[0031] As shown in Fig. 2, the handle frame 130 has a generally U-shape, but is not limited to this. The handle frame 130 includes a horizontal handle bar 131 and two vertical handle bars 132 connected to the left and right ends of the horizontal handle bar 131, respectively. One end of each vertical handle bar 132 remote from the horizontal handle bar 131 (i.e., the distal end of the handle frame 130) is pivotally connected to the front leg frame 120 via a lock joint 140, and a second pivot point X2 is defined by the lock joint 140. In the extension direction of the vertical handle bar 132, the second pivot point X2 is farther from the horizontal handle bar 131 than the first pivot point X1. The specific structure of the lock joint 140 will be described later.

[0032] The front leg frame 120 has a generally U-shape, but is not limited to this. The front leg frame 120 includes a front cross bar 121 and two front vertical bars 122 connected to the left and right ends of the front cross bar 121. The front cross bar 121 extends generally in the left-right direction and is connected to one end of each front vertical bar 122. One end of each front vertical bar 122 away from the front cross bar 121 (i.e., the distal end of the front leg frame 120) is connected to a locking joint 140. The front cross bar 121 can also be used as a footboard when a child rides on the seat assembly 200 of the cart 1000. At least one front wheel 402 is provided on the bottom of the front leg frame 120, and the front wheel 402 may be a swivel wheel or a non-swivel wheel. In this embodiment, two front wheels 402 are provided on the bottom of the front leg frame 120, and the two front wheels 402 are spaced apart in the left-right direction.

[0033] The rear leg frame 110 includes a rear cross bar 111 and two rear vertical bars 112 connected to the left and right ends of the rear cross bar 111. The rear cross bar 111 extends generally in the left-right direction. At least one rear wheel 401 is provided at the bottom of the rear leg frame 110, and the total number of rear wheels 401 and front wheels 402 is three or more. The rear wheel 401 may be a swivel wheel or a non-swivel wheel. In this embodiment, two rear wheels 401 are provided at the bottom of the rear leg frame 110, and the two rear wheels 401 are spaced apart in the left-right direction. In this embodiment, the size of the rear wheels 401 is larger than the size of the front wheels 402 to improve the stability of the overall structure of the cart 1000. Of course, in other alternative embodiments, the size of the rear wheels 401 may be the same as or smaller than the size of the front wheels 402.

[0034] Unless otherwise clearly specified or limited, the directional terms relating to the "left" and "right" of the cart 1000 in each embodiment of the present application are based on the "left" and "right" directions of the cart 1000 when the cart 1000 is normally pushed and walked, and the "left" and "right" directions are schematically indicated in the drawings by arrows L and R. These directional terms are used merely to clarify the explanation of the embodiments of the present application and are not intended to inappropriately limit the scope of protection of the present application.

[0035] As shown in Fig. 2, two folding mechanisms 300 are symmetrically provided on the left and right sides of the frame body 100, and the folding mechanisms 300 are intended to synchronously fold each part of the frame body 100. The two folding mechanisms 300 are respectively located inside the frame body 100. For convenience of explanation, the following description will take the folding mechanism 300 located on one side of the frame body 100 as an example.

[0036] 3 to 5, the folding mechanism 300 comprises a first link rod 310, a second link rod 320, and a linking rod 330, the first link rod 310 being pivotally connected to the rear leg frame 110 at a first pivot point S1 (also referred to as the first pivot axis S1) and pivotally connected to the second link rod 320 at a second pivot point S2 (also referred to as the second pivot axis S2), and the second link rod 320 being pivotally connected to the front leg frame 120 at a third pivot point S3 (also referred to as the third pivot axis S3). Optionally, an end of the first link rod 310 (i.e., a first end of the first link rod 310) is pivotally connected to the rear vertical bar 112 to form a first pivot point S1, and an end of the first link rod 310 remote from the first pivot point S1 (i.e., a second end of the first link rod 310) is pivotally connected to an end of the second link rod 320 (i.e., a first end of the second link rod 320) to form a second pivot point S2. Optionally, an end of the second link rod 320 remote from the second pivot point S2 (i.e., a second end of the second link rod 320) is pivotally connected to the front vertical bar 122 of the nose landing gear frame 120 to form a third pivot point S3. The link rod 330 is pivotally connected to the nose landing gear frame 120 and the first link rod 310, respectively. Optionally, the link rod 330 has a first end pivotally connected to the first link rod 310 to form a first pivot point R1, and a second end pivotally connected to the front vertical bar 122 of the front leg frame 120 to form a second pivot point R2. In this manner, the link rod 330 can rotate the first link rod 310 and also rotate the second link rod 320 pivotally connected to the first link rod 310, thereby driving and pivoting the front leg frame 120 in a direction toward or away from the rear leg frame 110, and further switching the frame main body 100 between a folded state (see FIG. 5) and an unfolded state (see FIG. 4). Optionally, the length of the first link rod 310 is longer than the length of the second link rod 320.

[0037] 3 to 5, in this embodiment, the first pivot point R1 is located between the first pivot point S1 and the second pivot point S2. That is, the first pivot point R1 does not overlap with the first pivot point S1, nor does it overlap with the second pivot point S2. The second pivot point R2 is located between the second pivot point X2 and the third pivot point S3. That is, the second pivot point R2 does not overlap with the second pivot point X2, nor does it overlap with the third pivot point S3. Optionally, the distance between the first pivot point R1 and the first pivot point S1 is approximately equal to the distance between the first pivot point R1 and the second pivot point S2, that is, the link rod 330 is connected to approximately the center of the first link rod 310. Optionally, the second pivot point R2 is located closer to the second pivot point X2, i.e., the distance between the second pivot point R2 and the second pivot point X2 is smaller than the distance between the second pivot point R2 and the third pivot point S3. In this way, interference of the folding mechanism 300 with the frame body 100 can be reduced, the frame body 100 can be folded more smoothly, and the volume of the folded frame body 100 can be made smaller.

[0038] Note that "the first pivot point R1 is located between the first pivot point S1 and the second pivot point S2" means that the first pivot point R1 is located between the first pivot point S1 and the second pivot point S2 in the extension direction of the first link rod 310. Similarly, "the second pivot point R2 is located between the second pivot point X2 and the third pivot point S3" means that the second pivot point R2 is located between the second pivot point X2 and the third pivot point S3 in the extension direction of the front vertical bar 122 of the front leg frame 120.

[0039] 6 and 7, the first link rod 310 includes a main body 314 and a pivotal portion 315. The main body 314 is a rod structure that extends generally linearly, and the extension direction of the first link rod 310 may be understood as the extension direction of the main body 314. The pivotal portion 315 is provided on a side edge of the main body 314, and optionally, the pivotal portion 315 is located approximately in the center of the main body 314. Optionally, both ends of the main body 314 are pivotally connected to the rear leg frame 110 and the second link rod 320, respectively, and the pivotal portion 315 is pivotally connected to a first end of the connecting rod 330. Optionally, a first retraction recess 332 is provided at the first end of link rod 330, a second retraction recess 3151 is provided at pivot portion 315, a portion of pivot portion 315 is housed in first retraction recess 332, and a first end of link rod 330 is housed in second retraction recess 3151, thereby enabling the surface of link rod 330 to be substantially flush with the surface of pivot portion 315 in the vicinity of first pivot point R1. In this way, link rod 330 can pivot relatively on substantially the same plane as first link rod 310, thereby reducing the space occupied by folding mechanism 300 in the left-right direction and preventing folding mechanism 300 from interfering with the folding or unfolding of frame main body 100.

[0040] The first link rod 310 is provided with a first fixed portion 313. Optionally, the first fixed portion 313 is provided adjacent to the first pivot point S1. The second link rod 320 is provided with a second fixed portion 323. Optionally, the second fixed portion 323 is provided adjacent to the third pivot point S3. The first fixed portion 313 and the second fixed portion 323 can each be connected to a basket cloth (not shown).

[0041] In some embodiments, the cart 1000 is provided with a basket assembly including a basket cloth (not shown) and a basket rod. The basket cloth is made of a foldable, flexible material, such as a woven fabric, a mesh fabric, or a plastic fabric. The basket cloth is fixed to the basket rod. Referring to FIG. 3 , in this embodiment, the first link rod 310 and the second link rod 320 are each formed as a basket rod. In this manner, when the first link rod 310 and the second link rod 320 pivot relative to each other, the basket cloth is folded, thereby achieving folding of the basket assembly.

[0042] In an embodiment not shown, the basket fabric may be fixed to the first link rod 310 and the second link rod 320 via the basket rod. Here, the structure of the basket rod corresponds to the structure of the first link rod 310 and the second link rod 320, so that when the first link rod 310 and the second link rod 320 are pivoted relative to each other, the basket rod is folded, the basket fabric is folded, and the basket assembly is then folded.

[0043] 5, when the frame body 100 is in the folded state, the rear leg frame 110 is located approximately between the front leg frame 120 and the handle frame 130 in the front-to-rear direction, and the folding mechanism 300 is located between the front leg frame 120 and the handle frame 130. Here, the first link rod 310 is approximately parallel to the rear vertical bar 112, that is, the main body 314 of the first link rod 310 is approximately parallel to the rear vertical bar 112. The second link rod 320 is located between the front leg frame 120 and the rear leg frame 110, and is not parallel to the front vertical bar 122. In some alternative embodiments, the second link rod 320 may be approximately parallel to the front vertical bar 122, and the first link rod 310 may not be parallel to the rear vertical bar 112.

[0044] Unless otherwise clearly specified or limited, the directional terms relating to the "front" and "rear" of the cart 1000 in each embodiment of the present application are based on the "front" and "rear" directions of the cart 1000 when the cart 1000 is normally pushed and walked, and the "front" and "rear" directions are schematically indicated by arrows F and B in the drawings. These directional terms are used merely to clarify the explanation of the embodiments of the present application and are not intended to inappropriately limit the scope of protection of the present application.

[0045] 3, when the frame body 100 is in the unfolded state, the first link rod 310 and the second link rod 320 are positioned on the same straight line, i.e., the extending direction of the first link rod 310 and the extending direction of the second link rod 320 are substantially the same. The front vertical bar 122, the rear vertical bar 112, the first link rod 310, and the second link rod 320 form a substantially triangular structure. The large supporting area of ​​this triangular structure improves the overall rigidity of the frame body 100 in the unfolded state, making it easier for the cart 1000 to overcome obstacles while being pushed and facilitating folding of the basket. Optionally, the first link rod 310 extends generally in the front-to-rear direction, i.e., the main body 314 of the first link rod 310 extends generally in the front-to-rear direction.

[0046] As shown in FIGS. 4 to 7 , the first link rod 310 is provided with a first position limiting portion 312, which abuts against the side edge of the second link rod 320, thereby limiting the pivot angle between the first link rod 310 and the second link rod 320 when the frame main body 100 is folded. Optionally, a first recess 311 is provided at the end of the first link rod 310 that pivots to the second link rod 320, i.e., the first recess 311 is provided at the second end of the first link rod 310. The first recess 311 can at least partially accommodate the second link rod 320, and the side wall of the first recess 311 forms the first position limiting portion 312. The second link rod 320 is provided with a second position limiting portion 322, which abuts against a side edge of the first link rod 310, thereby limiting the pivot angle between the first link rod 310 and the second link rod 320 when the frame body 100 is folded. Optionally, a second recess 321 is provided at the end of the second link rod 320 that pivots to the first link rod 310, i.e., the second recess 321 is provided at the first end of the second link rod 320. The second recess 321 can at least partially accommodate the first link rod 310, and the side wall of the second recess 321 forms the second position limiting portion 322. In this embodiment, the second end of first link rod 310 is housed in second recess 321, and the first end of second link rod 320 is housed in first recess 311, so that the outer surface of first link rod 310 is substantially flush with the outer surface of second link rod 320 near second pivot point S2. In other words, first link rod 310 and second link rod 320 are capable of pivoting in substantially the same plane. In some other embodiments, first position limiter 312 may be provided only on first link rod 310, or second position limiter 322 may be provided only on second link rod 320. Similarly, the first recess 311 may be provided only in the first link rod 310, and the first position limiting portion 312 may be formed by the side wall of the first recess 311, or the second recess 321 may be provided only in the second link rod 320, and the second position limiting portion 322 may be formed by the side wall of the second recess 321.

[0047] In some alternative embodiments, the first position limiter 312 may be a protruding structure protruding from the outer surface of the first link rod 310. The second position limiter 322 may be a protruding structure protruding from the outer surface of the second link rod 320.

[0048] 4 and 7, the shape of the first position limiting portion 312 matches the shape of the side edge of the second link rod 320. This increases the contact area when the first position limiting portion 312 abuts against the side edge of the second link rod 320. Optionally, the first position limiting portion 312 extends in a substantially straight line, and a first angle θ1 is formed between the extension direction of the first position limiting portion 312 and the extension direction of the first link rod 310, and the first angle θ1 is an acute angle. Of course, in other embodiments, the first position limiting portion 312 may be configured in other shapes, for example, a curve, depending on the shape of the side edge of the second link rod 320.

[0049] 5 and 6 , the shape of the second position limiting portion 322 matches the shape of the side edge of the first link rod 310. This increases the contact area when the second position limiting portion 322 abuts against the side edge of the first link rod 310. Optionally, the second position limiting portion 322 extends in a substantially straight line, and a second angle θ2 is formed between the extension direction of the second position limiting portion 322 and the extension direction of the second link rod 320, and the second angle θ2 is an acute angle. Optionally, the first angle θ1 and the second angle θ2 are equal. By adjusting the extension direction of the first position limiting portion 312 and / or the second position limiting portion 322, the pivot angle between the first link rod 310 and the second link rod 320 when the frame main body 100 is folded can be adjusted, thereby adjusting the size of the folded frame main body 100.

[0050] 3 to 5, the linking rod 330 is formed with an arc-shaped retraction recess 331, which is recessed toward the side away from the second pivot point S2. When the frame main body 100 is in the folded position, the linking rod 330 retracts from the second pivot point S2 via the retraction recess 331; that is, the linking rod 330 is spaced apart from the second pivot point S2 via the retraction recess 331, thereby preventing interference between the linking rod 330 and the second pivot point S2. Specifically, during the folding or unfolding process of the frame main body 100, the second pivot point S2 is always located between the front leg frame 120 and the linking rod 330 and does not come into contact with the linking rod 330. In this way, the link rod 330, the first link rod 310, and the second link rod 320 can be pivoted on approximately the same plane, and the link rod 330 is prevented from interfering with the folding and unfolding processes of the first link rod 310 and the second link rod 320. This allows the size of the frame body 100 in the front-to-rear direction to be reduced, and also makes folding and unfolding of the frame body 100 more convenient and smooth.

[0051] 2, there are two locking joints 140, and the two locking joints 140 are distributed almost symmetrically. For convenience of explanation, the following description will take the locking joint 140 located on one side as an example.

[0052] The locking joint 140 includes a first connecting seat 141 and a second connecting seat 142. The first connecting seat 141 is connected to one of the handle frame 130 and the front leg frame 120. The second connecting seat 142 is connected to the other of the handle frame 130 and the front leg frame 120. The first connecting seat 141 and the second connecting seat 142 are pivotally connected to define a second pivot point X2. As shown in FIG. 2 , in this embodiment, the first connecting seat 141 is connected to the handle vertical bar 132, and the second connecting seat 142 is connected to the front vertical bar 122.

[0053] 8 and 9, a connecting hole 1413 is formed in one of the first connecting seat 141 and the second connecting seat 142, and a connecting post 1423 is formed in the other of the first connecting seat 141 and the second connecting seat 142. The second pivot axis X2 (i.e., the second pivot point X2) is defined by the insertion and engagement of the connecting post 1423 with the connecting hole 1413. In this embodiment, the first connecting seat 141 is formed with the connecting hole 1413, and the second connecting seat 142 is formed with the connecting post 1423.

[0054] 2 and 9, the first connecting seat 141 has a first disk portion 1411 and a first connecting portion 1412. The outer contour of the first disk portion 1411 is approximately disk-shaped, and the first connecting portion 1412 is connected to the outer periphery of the first disk portion 1411. One end of the vertical handlebar bar 132 remote from the horizontal handlebar bar 131 is connected to the first connecting portion 1412, and optionally, the vertical handlebar bar 132 is inserted into the first connecting portion 1412. The rear vertical bar 112 is pivotally connected to the first connecting portion 1412. In other words, the rear vertical bar 112 is indirectly pivotally connected to the vertical handlebar bar 132 via the first connecting portion 1412. A first receiving groove 1414 is formed in the first disk portion 1411 facing the second connecting seat 142. A protruding post 1415 is provided in the first receiving groove 1414 , and the connecting hole 1413 is formed in the protruding post 1415 .

[0055] As shown in FIG. 8 , the second connecting seat 142 has a second disk portion 1421 and a second connecting portion 1426. The outer contour of the second disk portion 1421 is generally disk-shaped, and the second connecting portion 1426 is connected to the outer periphery of the second disk portion 1421. One end of the front vertical bar 122 remote from the front horizontal bar 121 is connected to the second connecting portion 1426. A second housing groove 1424 is formed in the second disk portion 1421 facing the first connecting seat 141. The connecting post 1423 is disposed in the second housing groove 1424 and protrudes from the opening of the second housing groove 1424. The protruding post 1415 protrudes from the opening of the first housing groove 1414 and partially enters the second housing groove 1424. In this way, the connecting post 1423 can be inserted further into the connecting hole 1413, thereby increasing the connection strength between the two and preventing unintentional separation between the first connecting seat 141 and the second connecting seat 142.

[0056] As shown in FIG. 2 , the second connecting seat 142 is provided with an engagement portion 1422. The engagement portion 1422 is located on a side of the second disk portion 1421 away from the first connecting seat 141 and protrudes in a direction away from the first connecting seat 141. The seat assembly 200 is provided with a mounting seat 210. The engagement portion 1422 engages with the mounting seat 210 to attach the seat assembly 200 to the frame main body 100. Optionally, the mounting seat 210 may be provided with a substantially U-shaped engagement groove 211. The engagement portion 1422 may be engaged with the engagement groove 211, and the mounting seat 210 may be detachably fixed to the lock joint 140 by an engagement lock mechanism 500 provided on the mounting seat 210, thereby realizing detachable connection between the seat assembly 200 and the frame main body 100. The detailed structure of the engagement lock mechanism 500 will not be described here.

[0057] 2, 8, and 9, in one embodiment, the locking joint 140 is provided with a locking mechanism 150 for limiting or allowing relative pivotal movement between the first connecting seat 141 and the second connecting seat 142. The locking mechanism 150 includes a locking member 151, a push-up member 152, an unlocking member 153, and a resetting member 154. The locking member 151 is movably provided within the first connecting seat 141 or the second connecting seat 142 so as to be switched between a locked position and an unlocked position. The push-up member 152 is located between the locking member 151 and the unlocking member 153, and the unlocking member 153 drives and moves the locking member 151 via the push-up member 152, thereby switching the locking member 151 to the unlocked position. The resetting member 154 can press the locking member 151 to move it to the locked position. When the locking member 151 is in the locked position, the locking member 151 engages with the first connecting seat 141 and the second connecting seat 142, respectively, thereby restricting relative pivotal movement between the first connecting seat 141 and the second connecting seat 142. On the other hand, when the locking member 151 is in the unlocked position, the locking member 151 disengages from one of the first connecting seat 141 and the second connecting seat 142, thereby allowing relative pivotal movement between the first connecting seat 141 and the second connecting seat 142.

[0058] The locking member 151 is fitted onto the protruding post 1415 and is movably provided in the first accommodating groove 1414. The locking member 151 is provided with a first locking portion 1511 and a second locking portion 1512. The first accommodating groove 1414 is provided with a first engaging portion 1416 that can engage with the first locking portion 1511, and the second accommodating groove 1424 is provided with a second engaging portion (not shown) that can engage with the second locking portion 1512. Referring to FIG. 8 , when the locking member 151 is in the locked position, one end of the locking member 151 protrudes from the first accommodating groove 1414 and enters the second accommodating groove 1424. At this time, the first locking portion 1511 engages with the first engaging portion 1416, and the second locking portion 1512 engages with the second engaging portion (not shown), thereby restricting relative pivotal movement between the first connecting seat 141 and the second connecting seat 142. When the locking member 151 is in the unlocked position, the locking member 151 retracts from the second accommodating groove 1424, the first locking portion 1511 engages with the first engagement portion 1416, and the second locking portion 1512 disengages from the second engagement portion (not shown) and engages with the first engagement portion 1416, thereby allowing relative pivoting between the first connecting seat 141 and the second connecting seat 142. In this embodiment, the locking member 151 has an external gear structure, and a first internal gear structure that meshes with the external gear structure is formed in the first accommodating groove 1414, and a second internal gear structure that meshes with the external gear structure is formed in the second accommodating groove 1424. A plurality of teeth of the external gear structure form the first locking portion 1511 and the second locking portion 1512, a plurality of teeth of the first internal gear structure form the first engagement portion 1416, and a plurality of teeth of the second internal gear structure form the second engagement portion (not shown). In other embodiments, the locking member 151 may have other shapes, such as a polygonal cylinder. The first receiving groove 1414 and the second receiving groove 1424 fit into the polygonal cylinder. The two ends of the polygonal cylinder are formed as a first locking portion 1511 and a second locking portion 1512, respectively. The side wall of the first receiving groove 1414 is formed as a first engagement portion 1416, and the side wall of the second receiving groove 1424 is formed as a second engagement portion (not shown).

[0059] 8 and 9, the resetting member 154 is, for example, a compression spring. The resetting member 154 is provided in the first accommodating groove 1414 and fitted onto the protruding post 1415. The resetting member 154 is provided between the bottom wall of the first accommodating groove 1414 and the locking member 151, so that the locking member 151 is always biased toward the locked position where it protrudes from the first accommodating groove 1414 (i.e., biased toward the second accommodating groove 1424).

[0060] The push-up member 152 is movably provided within the second connecting seat 142 and has a push-up portion 1521 and a push-up protrusion 1522. The push-up portion 1521 pushes up the locking member 151, thereby driving the locking member 151 to move to the unlocked position. An accommodating groove 1425 is provided on the second connecting seat 142 opposite the first connecting seat 141, and the accommodating groove 1425 communicates with the second accommodating groove 1424 via a communicating hole 1427. Optionally, the accommodating groove 1425 is formed generally in the engaging portion 1422. The push-up member 152 is movably provided within the accommodating groove 1425, and the push-up portion 1521 can enter the second accommodating groove 1424 through the communicating hole 1427 and abut against the locking member 151. The extending direction of the push-up portion 1521 is opposite to the protruding direction of the push-up protrusion 1522. Optionally, the push-up portion 1521 has a generally elongated rod structure and extends toward the locking member 151. The push-up protrusion 1522 protrudes toward the unlocking member 153, and the locking member 151 and the unlocking member 153 are located on opposite sides of the push-up member 152, respectively.

[0061] The unlocking member 153 is pivotally mounted within the second connecting seat 142, so that the unlocking member 153 can move the push-up protrusion 1522 by pushing it up. In this embodiment, the unlocking member 153 is fitted within the receiving groove 1425 and can be partially exposed from within the second connecting seat 142 through the groove opening of the receiving groove 1425. The unlocking member 153 is provided with a pivot portion 1531 and a first position limiting protrusion 1532. A pivot recess (not shown) is provided on the side wall of the receiving groove 1425, and the second position limiting protrusion 1428 is provided on the side wall or the groove opening of the receiving groove 1425. The pivot portion 1531 is inserted into the pivot recess (not shown) and defines the pivot axis of the unlocking member 153. The pivot portion 1531 extends generally in the front-to-rear direction. The first position limiting protrusion 1532 is stopped by the second position limiting protrusion 1428 , thereby limiting the position of the unlocking member 153 within the receiving groove 1425 .

[0062] In this embodiment, the mounting seat 210 is provided with a drive member (not shown) that can protrude from the mounting seat 210. After the engagement portion 1422 engages with the mounting seat 210, i.e., after the seat assembly 200 is attached to the frame main body 100, the unlocking member 153 is shielded by the mounting seat 210. A user can press the unlocking member 153 by driving the drive member that protrudes from the mounting seat 210, thereby driving the unlocking member 153 to pivot. The unlocking member 153 pivots to push up and move the push-up member 152, which in turn moves to push up and move the locking member 151 to the unlocked position, thereby folding the frame main body 100. In this way, the seat assembly 200 can be folded together with the frame main body 100 without removing the seat assembly 200 from the frame main body 100, improving the efficiency of the folding cart 1000.

[0063] The following is the folding procedure for the cart 1000 provided in the embodiment of the present application.

[0064] When the cart 1000 or the frame body 100 needs to be folded, the unlocking members 153 at the locking joints 140 on both the left and right sides are driven and pivoted by a driving member (not shown), and the unlocking members 153 move the push-up members 152 by pushing up the push-up protrusions 1522, and the push-up members 152 press the locking members 151 with the push-up portions 1521 to move them from the locked position to the unlocked position, thereby causing the locking members 151 to withdraw from the second accommodating grooves 1424 and allowing the first connecting seats 141 of the locking joints 140 to pivot relative to the second connecting seats 142.

[0065] 3 and 4, under the action of gravity, the handle frame 130 rotates in a clockwise direction D1 about the first pivot point X1, and moves the lock joint 140 and the entire link rod 330 upward, and the link rod 330 rotates the first link rod 310 about the first pivot point S1 relative to the rear leg frame 110 via the first pivot point R1 and the second pivot point R2, thereby moving the second pivot point S2 upward and in a direction approaching the rear leg frame 110. The movement of the second pivot point S2 causes the second link rod 320 to rotate in a counterclockwise direction D2 relative to the front leg frame 120, and the front leg frame 120 is driven by the second link rod 320 to pivot about the second pivot point X2 in a direction approaching the rear leg frame 110 (i.e., in the counterclockwise direction).

[0066] After the folding of the frame main body 100 is completed (see FIG. 5), the unlocking member 153 is released, and the locking member 151 partially enters the second accommodating groove 1424 under the action of the resetting member 154, and the second locking portion 1512 engages with the second engaging portion (not shown), thereby locking the cart 1000 in the folded state shown in FIG. 5. At the same time, while the locking member 151 enters the second accommodating groove 1424, the push-up member 152 presses and moves the push-up member 152 with the push-up portion 1521 of the push-up member 152, and the push-up member 152 pushes up the lock releasing member 153 with the push-up protrusion 1522 to pivot it, thereby returning the lock releasing member 153 and the push-up member 152 to their initial positions.

[0067] The technical features of the above embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0068] The above examples merely illustrate some embodiments of the present application, and although the descriptions are specific and detailed, they should not be understood as limiting the scope of the present invention. It should be noted that those skilled in the art can make some modifications and improvements within the scope of the present application without departing from the concept of the present application. Therefore, the scope of the patent of the present application shall be determined by the scope of the appended claims. [Explanation of symbols]

[0069] 1000 Cart 100 Frame body 110 Rear leg frame 111 Rear horizontal bar 112 Rear vertical bar 120 nose landing gear frame 121 Front horizontal bar 122 Front vertical bar 130 Handle Frame 131 Handlebar 132 Handlebar vertical bar 140 Locking Joint 141 1st connection seat 1411 First Disc 1412 1st connection part 1413 Connection hole 1414 First storage trench 1415 Convex pillar 142 2nd connection seat 1421 Second Disc 1422 Engagement part 1423 Connecting column 1424 Second storage trench 1425 Storage trench 1426 2nd connection part 1427 Communication hole 150 Locking mechanism 151 Locking member 152 Push-up member 1521 Push-up part 1522 Push-up protrusion 153 Unlocking member 154 Repositioning member 200 seat assembly 210 Mounting seat 211 Engagement groove 300 Folding mechanism 310 First link rod 311 First recess 312 First position limiting section 313 1st fixed part 314 Main body 315 Pivot joint 3151 Second Recess 320 Second link rod 321 Second recess 322 Second position limiting section 323 Second fixed part 330 Linking rod 331 Retreat recess 332 First Retreat Recess 401 rear wheel 402 front wheel 500 Engagement lock mechanism X1 1st pivot point X2 2nd pivot point S1 1st pivot point S2 2nd pivot point S3 3rd pivot point R1 First rotation point R2 Second rotation point θ1 1st angle θ2 2nd angle

Claims

1. A cart comprising a frame body and a folding mechanism; the frame body includes a front leg frame, a rear leg frame, and a handle frame, the rear leg frame being pivotally connected to the handle frame to form a first pivot point, and the front leg frame being pivotally connected to the handle frame to form a second pivot point; The folding mechanism includes: a first link rod pivotally connected to the rear leg frame at a first pivot point; a second link rod pivotally connected to the first link rod at a second pivot point and pivotally connected to the nose landing gear frame at a third pivot point; a link rod pivotally connected to the first link rod at a first pivot point and pivotally connected to the nose landing gear frame at a second pivot point; The second pivot point is located between the second pivot point and the third pivot point, and the link rod can switch the frame body between a folded state and an unfolded state by rotating the first link rod.

2. 2. The cart of claim 1, wherein a first end of the interlocking rod is pivotally connected to the first link rod to form the first pivot point, the first pivot point being located between the first pivot point and the second pivot point.

3. a first position limiting portion is provided on the first link rod, and the first position limiting portion is capable of limiting a pivot angle between the first link rod and the second link rod when the frame main body is folded by abutting against a side edge of the second link rod; and / or 2. The cart according to claim 1, characterized in that the second link rod is provided with a second position limiting portion, and the second position limiting portion can limit the pivot angle between the first link rod and the second link rod when the frame body is folded by abutting against a side edge of the first link rod.

4. a first recess is provided at an end of the first link rod that is pivotally connected to the second link rod, the first recess can accommodate at least a portion of the second link rod, and a first position limiting portion is formed by a side wall of the first recess, the first position limiting portion can abut against a side edge of the second link rod; and / or The cart described in claim 1, characterized in that a second recess is provided at the end of the second link rod that pivots to the first link rod, the second recess can at least partially accommodate the first link rod, and a second position limiting portion is formed by a side wall of the second recess, and the second position limiting portion can abut against a side edge of the first link rod.

5. The rear leg frame includes a rear horizontal bar and two rear vertical bars each connected to both ends of the rear horizontal bar, and the front leg frame includes a front horizontal bar and two front vertical bars each connected to both ends of the front horizontal bar, When the frame body is in the folded state, the first link rod is parallel to the rear vertical bar, or the second link rod is parallel to the front vertical bar, 2. The cart according to claim 1, wherein the first link rod and the second link rod are positioned on the same straight line when the frame body is in the unfolded state.

6. the first rotation point is located between the first pivot point and the second pivot point, and the link rod is recessed toward a side away from the second pivot point to form a retraction recess; 2. The cart according to claim 1, wherein when the frame body is in the folded state, the link rod is spaced apart from the second pivot point via the retraction recess.

7. The cart of claim 1, characterized in that the first link rod has a first fixed portion, the second link rod has a second fixed portion, and the first fixed portion and the second fixed portion can each be connected to a basket cloth.

8. The locking joint further includes: a first connecting seat connected to one of the handle frame and the front leg frame; a second connecting seat connected to the other of the handle frame and the front leg frame, the first connecting seat and the second connecting seat are pivotally connected to define the second pivot point; The cart further includes a seat assembly, the seat assembly being provided with a mounting seat; 2. The cart according to claim 1, wherein the second connecting seat has an engaging portion that protrudes in a direction away from the first connecting seat, and the engaging portion can engage with the mounting seat.

9. a locking mechanism is provided in the locking joint, the locking mechanism including a locking member, a push-up member, and a lock-releasing member; the locking member is movably provided within the first connection seat or the second connection seat so as to be switched between a locked position and an unlocked position, and when the locking member is in the locked position, the locking member engages with the first connection seat and the second connection seat, respectively, thereby restricting relative pivotal movement between the first connection seat and the second connection seat, and when the locking member is in the unlocked position, the locking member disengages from one of the first connection seat and the second connection seat, thereby allowing relative pivotal movement between the first connection seat and the second connection seat; the push-up member is movably provided within the second connecting seat, and the push-up member can drive the locking member to move to an unlocked position by pushing up the locking member, 9. The cart according to claim 8, wherein the lock release member is pivotally mounted within the second connecting seat, thereby enabling the push-up member to be pushed up and moved.

10. The cart according to claim 9, wherein the lock release member is shielded by the mounting seat after the engaging portion engages with the mounting seat.

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