Trolley and frame thereof

Abstract

The utility model relates to handcart technical field, specifically disclose a handcart and trolley frame, the trolley frame has unfolding state and folding state, and include: rear leg pipe subassembly, handlebar subassembly, front leg pipe subassembly, seat subassembly and front handrail subassembly, handlebar subassembly includes handlebar stem and first connecting rod, and first connecting rod is pivoted with handlebar stem, and rotates and connects rear leg pipe subassembly, front leg pipe subassembly rotates and connects rear leg pipe subassembly, seat subassembly is rotatablely connected first connecting rod and front leg pipe subassembly respectively, seat subassembly, front leg pipe subassembly, first connecting rod and rear leg pipe subassembly are connected into first four connecting rod mechanism, are used for seat subassembly, front leg pipe subassembly, first connecting rod and rear leg pipe subassembly synchronous folding and unfolding, front handrail subassembly is drivingly connected with seat subassembly, and is driven folding and / or unfolding by seat subassembly. According to the trolley frame of the utility model embodiment handcart, the front handrail subassembly can surround the seat space with seat subassembly, and when seat subassembly folds and unfolds, can drive the unfolding and folding of front handrail subassembly simultaneously, need not user to unfold or fold front handrail additionally, improve the convenience of using handcart.

Description

Technical Field

[0001] This utility model relates to the field of handcart technology, and in particular to a handcart and its frame. Background Technology

[0002] Strollers are an important tool for infants and toddlers to travel. To balance functionality during use with portability and convenience when not in use, strollers are usually designed to be foldable and unfoldable. At the same time, to improve the safety of strollers, they are usually equipped with a front handle. However, the front handle usually cannot be unfolded and folded in sync with the stroller body, requiring the user to unfold and fold it separately, which affects the user experience. Utility Model Content

[0003] The present invention aims to at least partially solve one of the technical problems in the related art. Therefore, one objective of the present invention is to provide a handcart frame that improves the convenience of using the handcart for the user.

[0004] Another objective of this invention is to provide a handcart, including the aforementioned frame.

[0005] According to an embodiment of the present invention, the frame of a handcart has an unfolded state and a folded state. The frame includes: a rear leg tube assembly, a handle assembly, a front leg tube assembly, a seat assembly, and a front armrest assembly. The handle assembly includes a handle bar and a first connecting rod. The first connecting rod is pivotally connected to the handle bar and rotatably connected to the rear leg tube assembly. The front leg tube assembly is rotatably connected to the rear leg tube assembly. The seat assembly is rotatably connected to the first connecting rod and the front leg tube assembly. The seat assembly, the front leg tube assembly, the first connecting rod, and the rear leg tube assembly are connected to form a first four-bar linkage for synchronously folding and unfolding the seat assembly, the front leg tube assembly, the first connecting rod, and the rear leg tube assembly. The front armrest assembly is drively connected to the seat assembly and is driven by the seat assembly to fold and / or unfold.

[0006] According to the embodiment of the present utility model, the frame of the handcart, the front armrest assembly and the seat assembly can surround the seating space, and when the seat assembly is folded and unfolded, the front armrest assembly can be unfolded and folded at the same time, so that the user does not need to unfold or fold the front armrest separately, thus improving the convenience of using the handcart.

[0007] In addition, the frame of the handcart according to the above embodiments of the present invention may also have the following additional technical features: In some embodiments, the front armrest assembly includes an armrest bar and a second link, the armrest bar being rotatably connected to the rear leg tube assembly, the second link being rotatably connected to the armrest bar, the second link being rotatably connected to the seat assembly, and the seat assembly being capable of driving the second link and the armrest bar to unfold and fold.

[0008] In some embodiments, the second link includes a groove, and the seat assembly includes a sliding portion slidably disposed in the groove, the groove having a first limit position and a second limit position. The sliding part is configured to drive the second link and the handrail to unfold at the first extreme position, and to drive the second link and the handrail to fold at the second extreme position.

[0009] In some embodiments, the seat assembly has a first hinge portion and a second hinge portion, the first hinge portion being hinged to the front leg tube assembly, the second hinge portion being hinged to the first link, and the sliding portion being disposed between the first hinge portion and the second hinge portion.

[0010] In some embodiments, the second link includes a first branch, a second branch, and a third branch. The first branch is hinged to the handrail, the second branch is connected between the first branch and the third branch, and the first branch and the third branch are spaced apart in the left-right direction. The slide groove is provided on the third branch.

[0011] In some embodiments, the handrail has a first limiting part and a second limiting part, and the second connecting rod is rotatably disposed between the first limiting part and the second limiting part. In the folded state, the second connecting rod abuts against the first limiting part, and in the unfolded state, the second connecting rod abuts against the second limiting part.

[0012] In some embodiments, the upper part of the front leg tube assembly is rotatably connected to the upper part of the rear leg tube assembly. In the unfolded state, the front leg tube assembly is tilted downward in the direction from back to front, and the rear leg tube assembly is tilted downward in the direction from front to back. The front armrest assembly and the rear leg tube assembly extend in opposite directions. In the folded state, the front leg tube assembly and the rear leg tube assembly are closed together, and the front armrest assembly is folded to one side of the front leg tube assembly.

[0013] In some embodiments, the handle assembly further includes a third link, the handle bar being rotatably connected to the first link, the third link being rotatably connected to the handle bar and the rear leg tube assembly, and the handle bar, the first link, the third link and the rear leg tube assembly being connected to form a second four-bar linkage.

[0014] In some embodiments, in the unfolded state, the front leg tube assembly and the third link extend in opposite directions; in the folded state, the third link is closed with the rear leg tube assembly, the front leg tube assembly is closed with the rear leg tube assembly, and the third link and the front leg tube assembly are respectively folded onto opposite sides of the rear leg tube assembly.

[0015] The handcart according to an embodiment of the present invention includes the aforementioned frame. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the frame of the handcart according to an embodiment of the present invention, wherein the frame is in the unfolded state.

[0017] Figure 2 yes Figure 1 Enlarged view of point A in the middle circle.

[0018] Figure 3 This is a schematic diagram of the frame of a handcart according to an embodiment of the present invention, showing the intermediate state of the frame switching from an unfolded state to a folded state.

[0019] Figure 4 yes Figure 3 Enlarged view of point B in the middle circle.

[0020] Figure 5 This is a schematic diagram of the frame of a handcart according to an embodiment of the present invention, wherein the frame is in a folded state.

[0021] Figure 6 yes Figure 5 Enlarged view of point C in the middle circle.

[0022] Figure 7 This is a schematic diagram of the second link of the frame of the handcart according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the handlebar of the handcart frame according to an embodiment of the present invention.

[0024] Figure label: The frame is 100, the rear leg tube assembly is 10, the handlebar assembly is 20, the handlebar bar is 21, the first link is 22, the third link is 23, the front leg tube assembly is 30, the seat assembly is 40, the sliding part is 41, the first hinge part is 42, the second hinge part is 43, the front grab handle assembly is 50, the grab handle bar is 51, the first limiting part is 511, the second limiting part is 512, the second link is 52, the slide is 521, the first extreme position is 5211, the second extreme position is 5212, the first support is 522, the second support is 523, and the third support is 524. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] Combination Figure 1 The trolley frame 100 according to an embodiment of the present invention includes: a rear leg tube assembly 10, a handle assembly 20, a front leg tube assembly 30, and a seat assembly 40. The frame 100 has an unfolded state and a folded state, combined with... Figure 1 The frame 100 is in the unfolded state, combined with Figure 5 In its folded state, the frame 100 can be unfolded and folded to adapt to different application scenarios of the handcart. For example, the frame 100 can serve as a support structure for the handcart, and the handcart may also include a body cover that is fitted over the outside of the frame 100.

[0027] Combination Figure 1 In the unfolded state, the rear leg tube assembly 10 and the front leg tube assembly 30 work together to support the vehicle body. For example, the front leg tube assembly 30 may include a front support tube and a front wheel, and the rear leg tube assembly 10 may include a rear support tube and a rear wheel. The front leg tube assembly 30 can bear the weight of the front end of the trolley and provides flexible steering, while the rear leg tube assembly 10 can bear the weight of the rear end of the trolley and has braking functions. The front leg tube assembly 30 and the rear leg tube assembly 10 are rotatably connected, facilitating the unfolding and folding of the frame 100 to adapt to different application scenarios of the trolley.

[0028] Combination Figure 1 The handle assembly 20 includes a handle bar 21 and a first connecting rod 22. The first connecting rod 22 is pivotally connected to the handle bar 21 and rotatably connected to the rear leg tube assembly 10. For example, the user can adjust the direction and force of the force by holding the handle bar 21 to achieve the movement and steering of the handcart.

[0029] The seat assembly 40 can be used to carry a passenger. The seat assembly 40 is rotatably connected to the first link 22 and the front leg tube assembly 30. The first link 22 is connected to the rear leg tube assembly 10. When the frame 100 is in the unfolded state, the front leg tube assembly 30, the first link 22, and the rear leg tube assembly 10 work together to support the seat assembly 40, facilitating stable passenger support. The seat assembly 40, the front leg tube assembly 30, the first link 22, and the rear leg tube assembly 10 are connected to form a first four-bar linkage mechanism, used for the synchronous folding and unfolding of the seat assembly 40, the front leg tube assembly 30, the first link 22, and the rear leg tube assembly 10, improving the convenience of using the trolley. For example, rotation of the first link 22 can synchronously drive the seat assembly 40, the front leg tube assembly 30, and the rear leg tube assembly 10 to fold and unfold simultaneously.

[0030] Combination Figure 1 The frame 100 also includes a front armrest assembly 50, which is connected to the seat assembly 40 and is driven by the seat assembly 40 to fold and / or unfold. The seat assembly 40 can act as the driving component, and the front armrest assembly 50 as the driven component. During the unfolding and folding of the frame 100, the seat assembly 40 can simultaneously drive the unfolding and folding of the front armrest assembly 50. Specifically, the front armrest assembly 50 can provide protection for the passenger. The front armrest assembly 50 and the seat assembly 40 work together to create a seating space to prevent the passenger from sliding out of the trolley. The front armrest assembly 50 also provides a convenient grip for the passenger, thereby improving the passenger's safety while riding the trolley. By connecting the front armrest assembly 50 to the seat assembly 40, the folding and unfolding of the front armrest assembly 50 can be facilitated. In conjunction with the aforementioned, the seat assembly 40, front leg tube assembly 30, first link 22, and rear leg tube assembly 10 are connected to form a first four-bar linkage structure. When the seat assembly 40 is folded and unfolded, the unfolding and folding of the front armrest assembly 50 can be simultaneously driven, eliminating the need for the user to separately unfold or fold the front armrest assembly 50, thus improving the convenience of using the trolley. For example, when the frame 100 is folded or unfolded, the first link 22 rotates, causing the seat assembly 40 to rotate. The seat assembly 40 then rotates the front armrest assembly 50, thereby driving the unfolding and folding of the front armrest assembly 50, further enhancing the convenience of using the trolley.

[0031] According to the embodiment of the present utility model, the frame 100 of the handcart, the front armrest assembly 50 and the seat assembly 40 can surround the seating space, and when the seat assembly 40 is folded and unfolded, the front armrest assembly 50 can be unfolded and folded at the same time, so that the user does not need to unfold or fold the front armrest assembly 50 separately, thus improving the convenience of using the handcart.

[0032] The front armrest assembly 50 is driven to the seat assembly 40 and is folded and / or unfolded by the seat assembly 40. For example, the front armrest assembly 50 may include an armrest bar 51. During the unfolding and folding of the frame 100, the armrest bar 51 and the seat assembly 40 can rotate in opposite directions, so that in the unfolded state, the front armrest bar 51 and the seat assembly 40 surround the seating space, and in the folded state, the structure of the frame 100 is more compact, facilitating the storage of the trolley. Furthermore, the front armrest assembly 50 is driven to the seat assembly 40, and a planetary gear transmission structure or a linkage mechanism may be provided between the armrest bar 51 and the seat assembly 40. When the seat assembly 40 rotates, it drives the front armrest assembly 50 to rotate, thereby realizing the unfolding and folding of the front armrest assembly 50 and improving the user's convenience in using the trolley.

[0033] Combination Figures 1 to 6 In some embodiments of this utility model, the front armrest assembly 50 includes an armrest rod 51 and a second connecting rod 52. The armrest rod 51 is rotatably connected to the rear leg tube assembly 10, and the second connecting rod 52 is rotatably connected to the armrest rod 51. The second connecting rod 52 is rotatably connected to the seat assembly 40, and the seat assembly 40 can drive the second connecting rod 52 and the armrest rod 51 to unfold and fold. Specifically, the armrest rod 51 can be used by the passenger for support and surrounds the seating space with the seat assembly 40. The second connecting rod 52 serves as the transmission structure between the seat assembly 40 and the armrest rod 51. During the rotation of the seat assembly 40, the second connecting rod 52 and the armrest rod 51 are driven to rotate, thereby driving the armrest rod 51 to fold and unfold. By setting the second connecting rod 52, the transmission structure between the seat assembly 40 and the front armrest assembly 50 is simplified, making it easier for the seat assembly 40 to drive the folding and unfolding of the front armrest assembly 50.

[0034] Combination Figure 1 In the extended state, the rear leg tube assembly 10 tilts downwards from front to back, and the armrest 51 and the rear leg tube assembly 10 can extend in opposite directions to allow the armrest 51 and the seat assembly 40 to surround the seating space. Figure 5 In the folded state, the handlebar 51 can be folded to one side of the front leg tube assembly 30 to make the frame 100 more compact when folded, making it easier to store the trolley.

[0035] Combination Figure 2 , Figure 4 and Figure 6In some embodiments of this utility model, the second link 52 includes a groove 521, and the seat assembly 40 includes a sliding part 41. The sliding part 41 is slidably disposed in the groove 521. The groove 521 has a first limit position 5211 and a second limit position 5212. The sliding part 41 is configured to drive the second link 52 and the armrest 51 to unfold when in the first limit position 5211, and to drive the second link 52 and the armrest 51 to fold when in the second limit position 5212. For example, during the folding of the front armrest assembly 50, the sliding part 41 of the seat assembly 40 can first slide from the first limit position 5211 to the second limit position 5212, and then drive the armrest rod 51 to fold through the second link 52. During the unfolding of the armrest assembly, the sliding part 41 of the seat assembly 40 can first slide from the second limit position 5212 to the first limit position 5211, and then drive the armrest rod 51 to unfold through the second link 52. That is to say, during the unfolding and folding of the frame 100, the slide groove 521 can delay the rotation of the front armrest assembly 50. The seat assembly 40 can rotate first, and after rotating a certain angle, the seat assembly 40 can be driven to rotate. It can be understood that the support part of the seat assembly 40 and the front armrest have a certain angle to create a seating space. During folding and unfolding, the seat assembly 40 is rotated at a certain angle first, and then the front armrest assembly 50 is driven to rotate, so that the structure of the frame 100 is more compact after folding and creates a larger seating space after unfolding. For example, the sliding part 41 can be a slider, rivet or other structure.

[0036] Combination Figure 3 and Figure 4 In some embodiments of this utility model, the seat assembly 40 has a first hinge portion 42 and a second hinge portion 43. The first hinge portion 42 is hinged to the front leg tube assembly 30, and the second hinge portion 43 is hinged to the first connecting rod 22. A sliding portion 41 is disposed between the first hinge portion 42 and the second hinge portion 43. Specifically, by providing the first hinge portion 42 and the second hinge portion 43, it is convenient for the front leg tube assembly 30 and the first connecting rod 22 to support the seat assembly 40 in the unfolded state. On the other hand, it is convenient for the seat assembly 40, the first connecting rod 22, and the front leg tube assembly 30 to fold synchronously. The sliding portion 41, disposed between the first hinge portion 42 and the second hinge portion 43, can make full use of the space between the front leg tube assembly 30 and the first connecting rod 22, making the structure of the frame 100 more compact, and facilitating the rotation of the front armrest assembly 50 via the seat assembly 40. Furthermore, by using the sliding part 41 in conjunction with the second link 52, a complex transmission structure is not required between the seat assembly 40 and the armrest 51, simplifying the structure of the frame 100.

[0037] Combination Figure 1 and Figure 7In some embodiments of this utility model, the second connecting rod 52 includes a first branch 522, a second branch 523 and a third branch 524. The first branch 522 is hinged to the handrail 51. The second branch 523 is connected between the first branch 522 and the third branch 524 and is spaced apart from the first branch 522 in the left and right direction. The sliding groove 521 is provided on the third branch 524. For example, the front armrest assembly 50 may include an armrest bar 51 and a second link 52. During the unfolding and folding of the frame 100, the armrest bar 51 and the seat assembly 40 may rotate in opposite directions so that the front armrest bar 51 and the seat assembly 40 surround the seating space when unfolded, and make the structure of the frame 100 more compact when folded, which facilitates the storage of the trolley. The second link 52 is provided with a second branch 523 so that the first branch 522 and the third branch 524 are spaced apart in the left and right directions, so as to avoid the seat assembly 40 interfering with the armrest bar 51 during rotation, thereby facilitating the stable folding and unfolding of the frame 100.

[0038] Combination Figure 2 , Figure 6 , Figure 8 In some embodiments of this utility model, the armrest 51 is provided with a first limiting part 511 and a second limiting part 512, and a second connecting rod 52 is rotatably disposed between the first limiting part 511 and the second limiting part 512. In the folded state, the second connecting rod 52 abuts against the first limiting part 511, and in the unfolded state, the first connecting rod 52 abuts against the second limiting part 512. Specifically, in the unfolded state, the second connecting rod 52 abuts against the first limiting part 511, so that the second connecting rod 52 is stably maintained in the unfolded state, preventing the second connecting rod 52 from rotating in the opposite direction, so as to facilitate the folding of the armrest 51 by the second connecting rod 52 when the frame 100 is folded; in the folded state, the second connecting rod 52 abuts against the second limiting part 512, so as to facilitate the stable maintenance of the front armrest assembly 50 in the folded state, so as to facilitate the unfolding of the armrest 51 by the second connecting rod 52 when the frame 100 is unfolded.

[0039] Combination Figure 8 For example, the handrail 51 may include a handrail body and a mating part, the mating part being connected to the handrail body and hinged to the second connecting rod 52, wherein the mating part may be provided with a groove, the groove forming a first limiting part 511 and a second limiting part 512.

[0040] Optionally, the first link 22 includes a first rod portion and a second rod portion. The first end of the first rod portion is rotatably connected to the rear leg tube assembly 10 and the second end is connected to the handlebar 21. One end of the second rod portion is connected to the first end of the first rod portion and the other end is rotatably connected to the seat assembly 40. The first rod portion and the second rod portion have an included angle of 0 to 90°. In the unfolded state, the first rod portion and the second rod portion form an upward-opening "V" shape. On the one hand, this facilitates the seat assembly 40 to be well supported by the cooperation of the first link 22 and the rear leg tube assembly 10. On the other hand, it facilitates the stable folding and unfolding of the frame 100.

[0041] Combination Figure 1 In some embodiments of this utility model, the upper part of the front leg tube assembly 30 is rotatably connected to the upper part of the rear leg tube assembly 10. In the unfolded state, the front leg tube assembly 30 tilts downwards from back to front, and the rear leg tube assembly 10 tilts downwards from front to back, so that the front leg tube assembly 30 and the rear leg tube assembly 10 can form a triangular structure to stably support the seat assembly 40 and other structures, thereby improving the structural strength and stability of the trolley. In the unfolded state, the front armrest assembly 50 and the rear leg tube assembly 10 extend in opposite directions, improving the structural stability of the front armrest assembly 50 and facilitating the front armrest assembly 50 and the seat assembly 40 to create a seating space. Figure 5 In the folded state, the front leg tube assembly 30 and the rear leg tube assembly 10 are closed, and the front armrest assembly 50 is folded to one side of the front leg tube assembly 30, making the frame 100 more compact after folding and reducing the space occupied by the trolley after folding.

[0042] Combination Figure 1 and Figure 3 In some embodiments of this utility model, the handle assembly 20 further includes a third link 23. The handlebar 21 is rotatably connected to the first link 22, and the third link 23 is rotatably connected to the handlebar 21 and the rear leg tube assembly 10. The handlebar 21, the first link 22, the third link 23, and the rear leg tube assembly 10 are connected to form a second four-bar linkage. The second four-bar linkage can be used to simultaneously fold and unfold the handlebar 21, the first link 22, the third link 23, and the rear leg tube assembly 10, improving the convenience of using the trolley. For example, when folding the frame 100, the handlebar 21 can be rotated counterclockwise, simultaneously driving the first link 22, the third link 23, and the rear leg tube assembly 10 to rotate, thereby realizing the folding of the frame 100.

[0043] In conjunction with the foregoing, the seat assembly 40, the front leg tube assembly 30, the first link 22, and the rear leg tube assembly 10 are connected to form a first four-bar linkage. During the rotation of the first link 22, the seat assembly 40 can be rotated synchronously, and the seat assembly 40 can be rotated synchronously to drive the front armrest assembly 50 to rotate, so as to realize the unfolding and folding of the front armrest assembly 50. The user does not need to unfold or fold the front armrest separately, which improves the convenience of the user in using the trolley.

[0044] Combination Figure 1 and Figure 5 Furthermore, in the unfolded state, the front leg tube assembly 30 and the third link 23 extend in opposite directions. In the folded state, the third link 23 is closed with the rear leg tube assembly 10, and the front leg tube assembly 30 is closed with the rear leg tube assembly 10. The third link 23 and the front leg tube assembly 30 are respectively folded onto opposite sides of the rear leg tube assembly 10. Specifically, in the unfolded state, the third link 23 can connect between the front leg tube assembly 30 and the handlebar 21. In the folded state, the front leg tube assembly 30 and the third link 23 are distributed on opposite sides of the rear leg tube assembly 10, making the frame 100 more compact in the folded state and facilitating the storage of the trolley. For example, when the frame 100 is placed vertically in the folded state, the front leg tube assembly 30 can be folded to the front of the rear leg tube assembly 10, and the third link 23 can be folded to the rear of the rear leg tube assembly.

[0045] For example, combined Figure 1 , Figure 3 and Figure 5 When the frame 100 is folded, the handlebar 21 can be rotated inward. The handlebar 21 drives the first link 22 downward, causing the seat assembly 40 to rotate clockwise. The sliding part 41 of the seat assembly 40 slides from the first limit position 5211 to the second limit position 5212 in the slide groove 521. When it continues to rotate downward, it drives the second link 52 to rotate. The second link 52 drives the handlebar 51 to rotate counterclockwise until it is fully folded, realizing one-click folding of the frame 100 and improving the convenience of using the handcart.

[0046] This utility model also proposes a handcart, including the aforementioned frame 100. Exemplarily, the handcart may further include a body cover, which is fitted over the outside of the frame 100. By providing the aforementioned frame 100, the folding and unfolding of the front handle assembly 50 is facilitated, improving the convenience for users in using the handcart.

[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are 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 utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A handcart frame (100), characterized in that, The frame (100) has an unfolded state and a folded state, and the frame (100) includes: Rear foot tube assembly (10); Handle assembly (20), the handle assembly (20) includes a handle bar (21) and a first connecting rod (22), the first connecting rod (22) is pivotally connected to the handle bar (21) and rotatably connected to the rear leg tube assembly (10); A front leg tube assembly (30) is rotatably connected to the rear leg tube assembly (10); A seat assembly (40) is rotatably connected to the first link (22) and the front leg tube assembly (30). The seat assembly (40), the front leg tube assembly (30), the first link (22), and the rear leg tube assembly (10) are connected to form a first four-bar linkage for the synchronous folding and unfolding of the seat assembly (40), the front leg tube assembly (30), the first link (22), and the rear leg tube assembly (10). A front armrest assembly (50) is tractively connected to the seat assembly (40) and is driven by the seat assembly (40) to fold and / or unfold.

2. The frame (100) of the handcart according to claim 1, characterized in that, The front armrest assembly (50) includes an armrest bar (51) and a second link (52). The armrest bar (51) is rotatably connected to the rear leg tube assembly (10). The second link (52) is rotatably connected to the armrest bar (51). The second link (52) is rotatably connected to the seat assembly (40). The seat assembly (40) can drive the second link (52) and the armrest bar (51) to unfold and fold.

3. The frame (100) of the handcart according to claim 2, characterized in that, The second link (52) includes a groove (521), and the seat assembly (40) includes a sliding part (41), which is slidably disposed in the groove (521). The groove (521) has a first limit position (5211) and a second limit position (5212). The sliding part (41) is configured to drive the second link (52) and the handrail (51) to unfold at the first extreme position (5211), and to drive the second link (52) and the handrail (51) to fold at the second extreme position (5212).

4. The frame (100) of the handcart according to claim 3, characterized in that, The seat assembly (40) has a first hinge portion (42) and a second hinge portion (43), the first hinge portion (42) being hinged to the front leg tube assembly (30), the second hinge portion (43) being hinged to the first connecting rod (22), and the sliding portion (41) being disposed between the first hinge portion (42) and the second hinge portion (43).

5. The frame (100) of the handcart according to claim 3, characterized in that, The second link (52) includes a first branch (522), a second branch (523) and a third branch (524). The first branch (522) is hinged to the handrail (51). The second branch (523) is connected between the first branch (522) and the third branch (524) and the first branch (522) and the third branch (524) are spaced apart in the left and right directions. The slide groove (521) is provided on the third branch (524).

6. The frame (100) of the handcart according to claim 2, characterized in that, The handrail (51) is provided with a first limiting part (511) and a second limiting part (512). The second connecting rod (52) is rotatably disposed between the first limiting part (511) and the second limiting part (512). In the folded state, the second connecting rod (52) abuts against the first limiting part (511), and in the unfolded state, the second connecting rod (52) abuts against the second limiting part (512).

7. The frame (100) of the handcart according to claim 1, characterized in that, The upper part of the front leg tube assembly (30) is rotatably connected to the upper part of the rear leg tube assembly (10). In the unfolded state, the front leg tube assembly (30) is tilted downwards in the direction from back to front, and the rear leg tube assembly (10) is tilted downwards in the direction from front to back. The front armrest assembly (50) and the rear leg tube assembly (10) extend in opposite directions. In the folded state, the front leg tube assembly (30) and the rear leg tube assembly (10) are closed together, and the front armrest assembly (50) is folded to one side of the front leg tube assembly (30).

8. The frame (100) of the handcart according to claim 1, characterized in that, The handle assembly (20) further includes a third link (23), the handle bar (21) is rotatably connected to the first link (22), the third link (23) is rotatably connected to the handle bar (21) and the rear leg tube assembly (10), and the handle bar (21), the first link (22), the third link (23) and the rear leg tube assembly (10) are connected to form a second four-bar linkage.

9. The frame (100) of the handcart according to claim 8, characterized in that, In the unfolded state, the front leg tube assembly (30) and the third link (23) extend in opposite directions. In the folded state, the third link (23) is closed with the rear leg tube assembly (10), the front leg tube assembly (30) is closed with the rear leg tube assembly (10), and the third link (23) and the front leg tube assembly (30) are folded on opposite sides of the rear leg tube assembly (10).

10. A handcart, characterized in that, The frame (100) includes any one of claims 1-9.

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