Top hinge device, bottom hinge device and foldable push carriage

Abstract

A top hinge device, characterized in that it comprises a foldable frame, wherein the foldable frame comprises a folding bracket (1) on the left and right sides, wherein the folding bracket (1) consists of a front top bar (11), a rear top bar (12) and a top hinge element (13) which is articulated to the front top bar (11) and the rear top bar (12), wherein a front top fitting (15) connected to the front top bar (11) and / or a rear top fitting (14) connected to the rear top bar (12) is articulated to the top hinge element (13) from one or both sides of the foldable frame.

Description

Technical area

[0001] The present application belongs to the field of technology for pushcarts and relates specifically to a top hinge device, a bottom hinge device and a foldable pushcart. Background technology

[0002] Folding push carts are currently available on the market. Folding push carts are very popular with consumers due to their foldable and space-saving features, as well as their easy carrying and storage options. However, their folding design inevitably results in lower structural strength compared to rigidly connected push carts. Folding push carts have directly connected front and rear bars, resulting in insufficient overall strength and stability. Furthermore, most current push carts have insufficient load-bearing capacity after the folding frame is unfolded; placing heavy objects or children sitting on them can easily cause damage or breakage of the support bars, causing safety concerns.To ensure overall structural stability, some push carts feature a triangular support structure for their folding frame. While this improves the overall stability of the push cart, folding and unfolding the cart is cumbersome and not very user-friendly. Content of the utility model

[0003] The purpose of the present utility model application is to provide a top hinge device, a bottom hinge device and a foldable push carriage which are characterized by an overall stable structure, good safety performance and easy folding and unfolding operation.

[0004] This application is implemented by the following technical solution: A top hinge device, characterized in that it comprises a foldable frame, wherein the foldable frame comprises a folding bracket on the left and right side, wherein the folding bracket consists of a front top bar, a rear top bar and a top hinge element which is articulated to the front top bar and the rear top bar, wherein a front top fitting connected to the front top bar and / or a rear top fitting connected to the rear top bar is articulated to the top hinge element from one or both sides of the foldable frame.

[0005] A lower hinge device, characterized in that the folding frame comprises a folding bracket on each of the left and right sides, wherein the folding bracket consists of a front lower bar, a rear lower bar, and a lower hinge element each hinged to the front lower bar and the rear lower bar. A front lower fitting connected to the front lower bar and / or a rear lower fitting connected to the rear lower bar are hinged to the lower hinge element on one or both sides of the folding frame.

[0006] A foldable push cart, characterized in that it comprises a foldable frame, wherein the foldable frame comprises a folding bracket and a folding bracket on the left and right sides, wherein the folding bracket consists of a front upper bar, a rear upper bar and a respective upper hinge element which is articulated to the front upper bar and the rear upper bar, wherein a front upper fitting connected to the front upper bar and / or a rear upper fitting connected to the rear upper bar is articulated to the upper hinge element on one or both sides of the foldable frame; wherein the folding bracket consists of a front lower bar, a rear lower bar and a respective lower hinge element which is articulated to the front lower bar and the rear lower bar.A front lower fitting connected to the front lower bar and / or a rear lower fitting connected to the rear lower bar are hinged to the lower hinge element on one or both sides of the folding frame.

[0007] A foldable push cart as mentioned above, wherein the foldable frame further comprises support rod assemblies on the left and right sides, the support rod assembly comprising a center stand support arranged between the unfolding bar and the fold-down bar, and front sliding stand supports and back sliding stand supports arranged on both sides of the center stand support, one end of the front sliding stand support being hinged to the center stand support and the other end of which is slidably mounted on the front lower bar in the longitudinal direction of the front lower bar, one end of the back sliding stand support being hinged to the center stand support and the other end of which is slidably mounted on the back lower bar in the longitudinal direction of the rear lower bar.

[0008] A foldable push cart as mentioned above, comprising a front locking assembly for restricting sliding movement of the front sliding stand support in the longitudinal direction of the front lower bar, a reverse locking assembly for restricting sliding of the reverse sliding stand support in the longitudinal direction of the rear lower bar, and a release assembly for releasing the front locking assembly and the reverse locking assembly.

[0009] A folding push cart as mentioned above, wherein the front locking assembly comprises: a first stop element which is attached to the front lower bar and serves to restrict sliding of the sliding end of the front sliding support in the direction opposite to the lower hinge element; a second stop member mounted on the front lower bar, one end of the second stop member projecting radially from the front lower bar toward the front lower bar and serving to restrict sliding from the sliding end of the front sliding support toward the lower hinge member; a first elastic member disposed between the front lower rod and the second stop member and serving to press the second stop member radially along the front lower rod so that the projecting end of the second stop member remains outside the front lower rod; When the fold-down bracket is unfolded, the sliding end of the front sliding stand support slides between the first stop member and the projection end of the second stop member to fix the sliding end of the front sliding stand support.

[0010] A folding pushcart as mentioned above, wherein the locking assembly comprises: a third stop element which is attached to the rear lower bar and serves to limit the sliding of the sliding end of the rear sliding support in the direction opposite to the lower hinge element; a fourth stop member mounted on the rear lower bar, one end of the fourth stop member projecting radially from the rear lower bar toward the rear lower bar and serving to restrict sliding from the sliding end of the rear sliding support toward the lower hinge member; a second elastic member disposed between the rear lower rod and the fourth stop member and serving to press the fourth stop member radially along the rear lower rod so that the projecting end of the fourth stop member remains outside the front lower rod; When the fold-down bracket is unfolded, the sliding end of the back-sliding stand slides between the third stop member and the projection end of the fourth stop member to fix the sliding end of the back-sliding stand.

[0011] A folding push cart as mentioned above, wherein the release assembly comprises: a movement fitting which is arranged on the central stand support so as to be movable along the longitudinal direction of the central stand support; a front release slider movably disposed within the front lower rod along the longitudinal direction of the front lower rod, the projection end of the second stop member passing through the front release slider and projecting outside the front lower rod, the front release slider being formed with the second stop member in an oblique wedge connection; a front pull line, one end of which is connected to the movement fitting and the other end of which is connected to the front release slide; a third elastic member disposed between the front release slider and the front lower rod, the third elastic member being compressed when the front release slider moves toward the lower hinge member; When the movement fitting moves towards the pop-up bar, the front release slider is pulled by the front pull cord so that it is moved towards the lower hinge element, wherein the front release slider radially presses the second stop element towards the front lower bar and thereby compresses the first elastic element until the projection end of the second stop element is retracted into the front lower bar in order to remove the limitation of the sliding movement from the sliding end of the front sliding support towards the lower hinge element.

[0012] A folding push cart as mentioned above, the release assembly also comprising the following: a back release slider which is movably arranged within the back lower rod along the longitudinal direction of the back lower rod, wherein the projecting end of the fourth stop element passes through the back release slider and protrudes outside the back lower rod, wherein the back release slider is designed with the fourth stop element in an oblique wedge connection; a retraction line, one end of which is connected to the movement fitting and the other end of which is connected to the return release slide; a fourth elastic member disposed between the back release slider and the back lower rod, the fourth elastic member being compressed when the back release slider moves toward the lower hinge member; When the movement fitting moves towards the pop-up bar, the return release slider is pulled by the retraction line so that it is moved towards the lower hinge element, wherein the return release slider radially presses the fourth stop element towards the rear lower rod and thereby compresses the second elastic element until the projection end of the fourth stop element is retracted into the rear lower rod in order to remove the limitation of the sliding movement from the sliding end of the return sliding support towards the lower hinge element.

[0013] A folding push cart as mentioned above, wherein the movement fitting comprises a tubular section movably nested on the central support and a lifting handle located on the tubular section near the folding bracket.

[0014] A folding push cart as mentioned above, wherein the upper hinge element and / or the lower hinge element have a U-shape.

[0015] Compared to the state of the art, the application has the following advantages: The folding bar in this application consists of a front lower bar, a rear lower bar, and a lower hinge element each hinged to the front lower bar and the rear lower bar. A front lower fitting connected to the front lower bar and / or a rear lower fitting connected to the rear lower bar are hinged to the lower hinge element on one or both sides of the folding frame. A front upper fitting and / or a rear upper fitting are hinged to the upper hinge element of a folding frame and connected to the front upper bar or the rear upper bar to create a reinforced structure for synchronized support of the bars during the folding and unfolding process. When unfolded, the front upper fitting and / or the rear upper fitting form a rigid auxiliary support capable of supporting heavier loads or supporting children.without the front upper bar and the rear upper bar being easily damaged, thereby greatly improving the load-bearing capacity and torsional stability of the front upper bar and the rear upper bar, and effectively solving the problem of easy breakage of the bars in conventional folding push carts due to simple hinges. Illustration of the attached drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings, which must be used in describing the embodiments, are briefly described below. Of course, the accompanying drawings in the following description represent only some embodiments of the present application. Those of ordinary skill in the art can obtain other accompanying drawings based on these drawings without any creative effort. Fig. 1 is a three-dimensional view of Embodiment 1 of the present application; Fig. 2 is a main view of Fig. 1; Fig. 3 is a three-dimensional view of Embodiment II of the present application; Fig. 4 is a schematic representation of the Fig. 3 when folded; Fig. 5 is a schematic diagram of the local structure of Embodiment II of the present application; Fig. Figure 6 is a schematic representation of the explosion structure of Fig. 5; Fig. Figure 7 is an enlarged view of A in Fig. 6. Embodiments

[0017] To further clarify the technical problems, technical solutions, and advantageous effects to be solved by this application, the application is described in more detail below in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein serve only to explain the application and do not limit the application.

[0018] With reference to Fig. 1 to Fig.7, a top hinge device comprises a foldable frame, wherein the foldable frame comprises a folding bracket 1 on the left and right side, wherein the folding bracket 1 consists of a front top bar 11, a rear top bar 12 and an upper hinge element 13 which is articulated to the front top bar 11 and the rear top bar 12, wherein a front top fitting 15 connected to the front top bar 11 and / or a rear top fitting 14 connected to the rear top bar 12 is articulated to the upper hinge element 13 from one or both sides of the foldable frame.

[0019] In Embodiment I, a front upper fitting and / or a rear upper fitting are hinged to the upper hinge element of a folding frame and connected to the front upper bar or the rear upper bar to realize a reinforced structure for synchronized support of the bars during the folding and unfolding process: In the unfolded state, the front upper fitting and / or the rear upper fitting form a rigid auxiliary support capable of bearing heavier loads or supporting children without easily damaging the front upper bar and the rear upper bar, thereby greatly improving the load-bearing capacity and torsional stability of the front upper bar and the rear upper bar, and effectively solving the problem of easy breakage of the bars in conventional folding push carts due to simple hinges.

[0020] A lower hinge device, wherein the foldable frame comprises a folding bracket 2 on each of the left and right sides, wherein the folding bracket 2 consists of a front lower bar 21, a rear lower bar 22 and a lower hinge element 23 which is hinged to the front lower bar 21 and the rear lower bar 22, wherein a front lower fitting 25 connected to the front lower bar 21 and / or a rear lower fitting 24 connected to the rear lower bar 22 is hinged to the lower hinge element 23 from one or both sides of the foldable frame.

[0021] In this embodiment, by installing folding brackets on the left and right sides of the folding frame, including the front lower bar, the rear lower bar, and lower hinges, respectively hinged to the front lower bar and the rear lower bar, the folding and unfolding functions of the folding bracket are realized, thereby improving the flexibility and portability of the entire frame. In the unfolded state, the front lower bar and the rear lower bar form a fixed auxiliary support through the lower hinge, which greatly improves the load-bearing capacity and torsional stability of the entire frame, and effectively solves the problem of easy breakage of the bars in conventional folding push carts due to simple hinges.

[0022] A folding push cart comprising a top hinge device and a bottom hinge device as mentioned above.

[0023] In this embodiment, a front lower fitting and / or a rear lower fitting is hinged to the lower hinge element and connected to the front lower bar or the rear lower bar to realize a reinforced structure for synchronized support of the bars during the folding and unfolding process: In the unfolded state, the front lower fitting and / or the rear lower fitting form a rigid auxiliary support, thereby significantly improving the load-bearing capacity and torsional stability of the front lower bar and the rear lower bar, and effectively solving the problem of easy breakage of the bars in conventional folding push carts due to simple hinges.

[0024] Furthermore, as a preferred embodiment of the present scheme, the foldable frame still includes, instead of limiting, support rod assemblies 3 on the left and right sides, wherein the support rod assembly 3 includes a center stand support 31 arranged between the unfolding bracket 1 and the folding bracket 2, and front sliding stand supports 32 and rear sliding stand supports 33 arranged on both sides of the center stand support 31, wherein one end of the front sliding stand support 32 is hinged to the center stand support 31 and the other end is slidably mounted on the front lower bar 21 in the longitudinal direction of the front lower bar 21, wherein one end of the rear sliding stand support 33 is hinged to the center stand support 31 and the other end is slidably mounted on the rear lower bar 22 in the longitudinal direction of the rear lower bar 22.

[0025] In this embodiment, by arranging support rod assemblies on the left and right sides of the folding frame, including the center stand support located between the upright and downright brackets, and the front sliding stand support and the back sliding stand support, respectively arranged on the left and right sides of the center stand support, the folding and unfolding functions of the support rod assemblies are realized, thereby improving the flexibility and portability of the entire frame. When unfolded, the front sliding stand support and the back sliding stand support form a robust auxiliary support through the center stand support, greatly improving the load-bearing capacity and torsional stability of the entire frame, and effectively solving the problem of easy breakage of the rods in conventional folding push carts due to simple hinges.At the same time, due to the sliding installation characteristics of the front sliding stand support and the rear sliding stand support, no additional operation steps are required when folding, which not only avoids the cumbersome triangular support structure but also provides reliable support when riding children or carrying heavy objects, taking into account structural strength, safety, and ease of use. Furthermore, the front sliding stand support and the rear sliding stand support further improve the support capacity and stability of the entire frame, effectively solving the problem that traditional folding push carts are easily damaged and broken when carrying heavy objects or children.

[0026] Furthermore, as a preferred embodiment of the present scheme, it also comprises a front locking assembly 4 for restricting the sliding movement of the front sliding stand support 32 in the longitudinal direction of the front lower bar 21, a rear locking assembly 5 for restricting the sliding of the rear sliding stand support 33 in the longitudinal direction of the rear lower bar 22 and a release assembly 6 which serves to release the front locking assembly 4 and the rear locking assembly 5.

[0027] In this embodiment, the introduction of the front locking assembly 4, the rear locking assembly 5, and the unlocking assembly 6 provides a reliable locking and unlocking mechanism for the sliding stand support of the foldable push cart, which greatly improves the stability and ease of use of the push cart. During use, the front locking assembly 4 and the rear unlocking assembly 5 can effectively limit the sliding of the front sliding stand support 32 and the rear sliding stand support 33 along the longitudinal direction of the front lower bar 21 and the rear lower bar 22, ensuring that the push cart has sufficient structural strength and stability in the unfolded state to safely transport heavy objects or children. This locking mechanism makes the push cart more stable during use and avoids safety hazards caused by the sliding stand support becoming loose.At the same time, the design of the release assembly 6 allows the push cart to quickly and easily release the sliding stand support when it needs to be folded or unfolded, which is simple and quick to operate and improves the user experience.

[0028] Furthermore, as a preferred embodiment of the present scheme, the front lock assembly 4 includes, rather than limiting, the following: a first stop element 41 which is attached to the front lower rod 21 and serves to restrict the sliding end 32a of the front sliding support 32 in the direction opposite to the lower hinge element 23; a second stop member 42 attached to the front lower rod 21, one end of the second stop member 42 projecting radially out of the front lower rod 21 toward the front lower rod 21 and serving to restrict sliding of the sliding end 32a of the front sliding support 32 toward the lower hinge member 23; a first elastic member 43 disposed between the front lower rod 21 and the second stop member 42 and serving to press the second stop member 42 radially along the front lower rod 21 so that the projecting end 42a of the second stop member 42 remains outside the front lower rod 21; When the fold-down bracket 2 is unfolded, the sliding end 32a of the front sliding stand support 32 slides between the first stop member 41 and the projection end 42a of the second stop member 42 to fix the sliding end 32a of the front sliding stand support 32.

[0029] In this embodiment, the synergy of the first stop member 41 and the second stop member 42 effectively prevents the sliding end 32a of the front sliding stand support 32 from sliding on the front lower bar 21, providing a stable support structure when the push cart is deployed, thereby improving the overall stability of the push cart. The first stop member 41 is fixed to the front lower bar 21 to prevent the sliding end 32a of the front sliding stand support 32 from sliding in a direction away from the lower hinge member 23, while the second stop member 42 is maintained in an extended state by the elastic force of the first elastic member 43, thereby causing the sliding end 32a of the front sliding stand support 32 to slide in a direction close to the lower hinge member 23.This double limit mechanism ensures the fixed position of the front sliding support 32 when unfolded, avoids the safety hazards caused by the sliding support coming loose, and improves the reliability of the pushchair when carrying heavy objects or children.

[0030] Specifically, when the folding bracket 2 is deployed, the sliding end 32a of the front sliding support 32 slides between the first stopper member 41 and the protrusion end 42a of the second stopper member 42 during the sliding operation. At this time, the elastic force of the first elastic member 43 pushes the second stopper member 42 to maintain an extended state, thereby locking the sliding end 32a of the front sliding support 32 between the two stopper members to ensure that it does not slip during use. This locking mechanism is simple and effective and can significantly improve the stability and safety of the push cart without increasing the complex structure.

[0031] Furthermore, as a preferred embodiment of the present scheme, the lock assembly 5 includes, rather than limiting, the following: a third stop element 51 which is attached to the rear lower rod 22 and serves to restrict the sliding end 33a of the rear sliding support 33 from sliding in the direction opposite to the lower hinge element 23; a fourth stop member 52 attached to the rear lower rod 22, one end of the fourth stop member 52 projecting radially out of the rear lower rod 22 toward the rear lower rod 22 and serving to restrict sliding of the sliding end 33a of the rear sliding support 33 toward the lower hinge member 23; a second elastic member 53 disposed between the rear lower rod 22 and the fourth stop member 52 and serving to press the fourth stop member 52 radially along the rear lower rod 22 so that the projecting end 52a of the fourth stop member 52 remains outside the front lower rod 21; When the fold-down bracket 2 is unfolded, the sliding end 33a of the back sliding stand 33 slides between the third stop member 51 and the projection end 52a of the fourth stop member 52 to fix the sliding end 33a of the back sliding stand 33.

[0032] In this embodiment, the synergy of the third stopper member 51 and the fourth stopper member 52 effectively prevents the sliding end 33a of the back-sliding stand support 33 from sliding on the back lower bar 22, providing a stable support structure when the push cart is deployed, thereby improving the overall stability of the push cart. The third stopper member 51 is fixed to the back lower bar 22 to prevent the sliding end 33a of the back-sliding stand support 33 from sliding in a direction away from the lower hinge member 23, while the fourth stopper member 52 is maintained in an extended state by the elastic force of the second elastic member 53, thereby causing the sliding end 33a of the back-sliding stand support 33 to slide in a direction close to the lower hinge member 23.This double limit mechanism ensures the fixed position of the back sliding stand support 33 when unfolded, avoids the safety hazards caused by the sliding stand support coming loose, and improves the reliability of the push cart when carrying heavy objects or children.

[0033] Specifically, when the folding bracket 2 is deployed, the sliding end 33a of the return sliding support 33 slides between the third stopper member 51 and the protruding end 52a of the fourth stopper member 52 during the sliding operation. At this time, the elastic force of the second elastic member 53 pushes the fourth stopper member 52 to maintain an extended state, thereby locking the sliding end 33a of the return sliding support 33 between the two stopper members to ensure that it does not slip during use. This locking mechanism is simple and effective and can significantly improve the stability and safety of the push cart without increasing the complex structure.

[0034] Furthermore, as a preferred embodiment of the present scheme, the release assembly 6 includes, rather than limiting, the following: a movement fitting 61 which is movably arranged on the center stand support 31 along the longitudinal direction of the center stand support 31; a front release slide 62 which is movably arranged within the front lower rod 21 along the longitudinal direction of the front lower rod 21, wherein the projection end 42a of the second stop element 42 passes through the front release slide 62 and protrudes outside the front lower rod 21, wherein the front release slide 62 is designed with the second stop element 42 in an oblique wedge connection; a front traction line 63, one end of which is connected to the movement fitting 61 and the other end of which is connected to the front release slide 62; a third elastic member 64 disposed between the front release slide 62 and the front lower rod 21, the third elastic member 64 being compressed when the front release slide 62 moves toward the lower hinge member 23; When the movement fitting 61 moves towards the folding bracket 1, the front release slider 62 is pulled by the front pull cord 63 so that it is moved towards the lower hinge element 23, wherein the front release slider 62 radially presses the second stop element 42 towards the front lower bar 21 and thereby compresses the first elastic element 43 until the projecting end 42a of the second stop element 42 is retracted into the front lower bar 21 to remove the limitation of the sliding movement from the sliding end 32a of the front sliding support 32 towards the lower hinge element 23.

[0035] In Embodiment II, the synergy of the movement fitting 61, the front release slider 62, the front pull cord 63, and the third elastic element 64 provides a simple and efficient release mechanism so that the front sliding stand support 32 can be quickly released and folded. As the movement fitting 61 moves along the center stand support 31, the front release slider 62 is pulled by the front pull cord 63, causing it to move along the front lower bar 21 in a direction close to the lower hinge element 23.Meanwhile, the oblique spline connection of the front release slider 62 and the second stop member 42 radially pushes the second stop member 42 toward the front lower rod 21, compressing the first elastic member 43 until the protruding end 42a of the second stop member 42 retracts into the front lower rod 21, thereby releasing the sliding movement limitation of the sliding end 32a of the front sliding support 32. This design is not only easy to operate, but since the pulling direction of the movement fitting coincides with the folding direction of the push carriage, the release operation and folding operation can be performed quickly and synchronously, improving the efficiency of the push carriage folding and the user experience. The release assembly 6 uses a simple mechanical transmission principle.The movement of the movement fitting 61 is transmitted to the front release slide 62 via the front pull cord 63, and the front release slide 62 cooperates with the oblique wedge connection of the second stop element 42 to convert the linear movement into a radial movement, thereby realizing the release of the second stop element 42. The role of the third elastic element 64 is to provide appropriate resistance during the release process, ensuring the smooth running of the release process, and at the same time, to quickly return to its original position after the release is completed, ready for the next locking operation.

[0036] Furthermore, as a preferred embodiment of the present scheme, the release assembly 6 also includes, rather than limiting, the following: a back release slide 65 which is arranged movably along the longitudinal direction of the back lower rod 22 within the back lower rod 22, wherein the projection end 52a of the fourth stop element 52 passes through the back release slide 65 and protrudes outside the back lower rod 22, wherein the back release slide 65 is designed with the fourth stop element 52 in an oblique wedge connection; a retraction line 66, one end of which is connected to the movement fitting 61 and the other end of which is connected to the return release slide 65; a fourth elastic member 67 disposed between the back release slider 65 and the back lower rod 22, the fourth elastic member 67 being compressed when the back release slider 65 moves toward the lower hinge member 23; When the movement fitting 61 moves toward the pop-up bar 1, the return release slider 65 is pulled by the retraction line 66 to move toward the lower hinge element 23, the return release slider 65 radially presses the fourth stop element 52 toward the rear lower rod 22 while compressing the second elastic element 53 until the projection end 52a of the fourth stop element 52 is retracted into the rear lower rod 22 to release the limitation of the sliding movement from the sliding end 33a of the return slide support 33 toward the lower hinge element 23.

[0037] In this embodiment, by introducing the reverse release slider 65, the retraction cord 66, and the fourth elastic member 67, simultaneous release of the sliding end 33a of the reverse slide stand 33 is realized, further improving the folding efficiency and ease of operation of the foldable push cart. Thus, the front slide stand 32 and the reverse slide stand 33 can be released simultaneously, reducing the steps and time of the folding process, but also ensuring the balance and stability of the push cart during the folding process. By operating the movement fitting 61 once, the actions of the front release slider 62 and the reverse release slider 65 can be controlled simultaneously. This integrated release mechanism greatly simplifies the folding process, reduces the difficulty of operation, and improves the user experience.When the movement fitting 61 moves along the center stand 31 toward the folding bracket 1, the front release slide 62 and the rear release slide 65 are pulled by the front pull line 63 and the retraction line 66. Meanwhile, an oblique wedge connection of the front release slide 62 with the second stop element 42 and an oblique wedge connection of the rear release slide 65 with the fourth stop element 52 are formed. Both stop elements are pressed to move radially toward the front lower rod 21 and the rear lower rod 22, thereby compressing the first elastic element 43 and the second elastic element 53 until the projection end 42a and projection end 52a are retracted into the respective lower rod, thereby releasing the limitation of the sliding movement of the front sliding stand 32 and the rear sliding stand 33.This design uses a simple mechanical transmission principle and realizes the synchronization of multiple release operations through one operating component, thereby improving the efficiency and reliability of operation.

[0038] Furthermore, as a preferred embodiment of the present scheme, the movement fitting 61 also comprises a tube section 611 which is movably nested on the central standing support 31, and a lifting handle 612 which is located on the tube section 611 near the folding bracket 1.

[0039] In this embodiment, when folding, one only needs to hold the position of the upper hinge element, and by lifting the lifting handle 612, one can release the release assembly to unlock the front locking assembly and the rear locking assembly for the front sliding stand support, as well as the rear sliding stand support. At the same time, lifting the upper upper hinge element causes the push cart to fold, making operation more convenient.

[0040] Furthermore, as a preferred embodiment of the present scheme, the upper hinge element 13 and / or the lower hinge element 23 have a U-shape.

[0041] The implementation example works according to the following principles: In a top-hinge device, a bottom-hinge device, and a foldable push cart of this application, a front top fitting and / or a rear top fitting are hinged to the top hinge element of a foldable frame and connected to the front top bar or the rear top bar to realize a reinforced structure for synchronized support of the bars during the folding and unfolding process. In the unfolded state, the front top fitting and / or the rear top fitting form a rigid auxiliary support capable of bearing heavier loads or supporting children without easily damaging the front top bar and the rear top bar, thereby significantly improving the load-bearing capacity and torsional stability of the front top bar and the rear top bar, and effectively solving the problem of easy breakage of the bars in conventional foldable push carts due to simple hinges.

[0042] The above embodiments are based on the specific contents and should not be construed as limiting the specific embodiments of this application. Any methods, structures, or the like that are similar or nearly identical to this application, as well as any technical derivatives or substitutions based on the conceptual premises set forth in this application, are to be considered part of the scope of this application.

Claims

[1] A top hinge device, characterized by in that it comprises a foldable frame, wherein the foldable frame comprises a folding bracket (1) on the left and right side, wherein the folding bracket (1) consists of a front upper bar (11), a rear upper bar (12) and an upper hinge element (13) which is articulated to the front upper bar (11) and the rear upper bar (12), wherein a front upper fitting (15) connected to the front upper bar (11) and / or a rear upper fitting (14) connected to the rear upper bar (12) is articulated to the upper hinge element (13) from one or both sides of the foldable frame. [2] A lower hinge device, characterized byin that the foldable frame comprises a folding bracket (2) on each of the left and right sides, the folding bracket (2) consisting of a front lower bar (21), a rear lower bar (22) and a lower hinge element (23) which is articulated to the front lower bar (21) and the rear lower bar (22), a front lower fitting (25) connected to the front lower bar (21) and / or a rear lower fitting (24) connected to the rear lower bar (22) being articulated to the lower hinge element (23) on one or both sides of the foldable frame. [3] A folding pushcart, characterized bythat it comprises a foldable frame, wherein the foldable frame comprises on the left and right sides a folding bracket (1) and a folding bracket (2), wherein the folding bracket (1) consists of a front upper bar (11), a rear upper bar (12) and in each case an upper hinge element (13) which is articulated to the front upper bar (11) and the rear upper bar (12), wherein a front upper fitting (15) connected to the front upper bar (11) and / or a rear upper fitting (14) connected to the rear upper bar (12) is articulated to the upper hinge element (13) from one or both sides of the foldable frame;wherein the folding bracket (2) consists of a front lower bar (21), a rear lower bar (22) and a respective lower hinge element (23) which is articulated to the front lower bar (21) and the rear lower bar (22), wherein a front lower fitting (25) connected to the front lower bar (21) and / or a rear lower fitting (24) connected to the rear lower bar (22) is articulated to the lower hinge element (23) from one or both sides of the foldable frame; [4] A folding pushcart according to claim 3, characterized byin that the foldable frame further comprises support rod assemblies (3) on the left and right sides, wherein the support rod assembly (3) comprises a central stand support (31) arranged between the folding bar (1) and the folding bar (2), as well as a front sliding stand support (32) and a back sliding stand support (33) arranged on both sides of the central stand support (31), wherein one end of the front sliding stand support (32) is hinged to the central stand support (31) and its other end is slidably mounted on the front lower bar (21) in the longitudinal direction of the front lower bar (21), wherein one end of the back sliding stand support (33) is hinged to the central stand support (31) and its other end is slidably mounted on the back lower bar (22) in the longitudinal direction of the back lower bar (22). [5] A folding pushcart according to claim 4, characterized bythat it has a front locking assembly (4) for restricting the sliding movement of the front sliding support (32) in the longitudinal direction of the front lower bar (21), a back locking assembly (5) for restricting the sliding of the back sliding support (33) in the longitudinal direction of the back lower bar (22) and a release assembly (6) which serves to release the front locking assembly (4) and back locking assembly (5). [6] A folding pushcart according to claim 5, characterized by that the front locking assembly (4) comprises: a first stop element (41) which is attached to the front lower rod (21) and serves to restrict sliding of the sliding end (32a) of the front sliding support (32) in the direction opposite to the lower hinge element (23); a second stop element (42) which is attached to the front lower bar (21), one end of the second stop element (42) protruding radially from the front lower bar (21) in the direction of the front lower bar (21) and serving to restrict sliding from the sliding end (32a) of the front sliding support (32) in the direction of the lower hinge element (23); a first elastic element (43) arranged between the front lower rod (21) and the second stop element (42) and serving to press the second stop element (42) radially along the front lower rod (21) so that the projecting end (42a) of the second stop element (42) remains outside the front lower rod (21); when the folding bracket (2) is unfolded, the sliding end (32a) of the front sliding support (32) slides between the first stop member (41) and the projection end (42a) of the second stop member (42) to fix the sliding end (32a) of the front sliding support (32). [7] A folding pushcart according to claim 6, characterized by that the non-return assembly (5) comprises: a third stop element (51) which is attached to the rear lower rod (22) and serves to restrict sliding of the sliding end (33a) of the rear sliding support (33) in the direction opposite to the lower hinge element (23); a fourth stop element (52) which is attached to the rear lower rod (22), one end of the fourth stop element (52) protruding radially from the rear lower rod (22) in the direction of the rear lower rod (22) and serving to restrict sliding from the sliding end (33a) of the rear sliding support (33) in the direction of the lower hinge element (23); a second elastic member (53) disposed between the rear lower rod (22) and the fourth stop member (52) and serving to press the fourth stop member (52) radially along the rear lower rod (22) so that the projection end (52a) of the fourth stop member (52) remains outside the rear lower rod (22); when the folding bracket (2) is unfolded, the sliding end (33a) of the back sliding stand (33) slides between the third stop member (51) and the projection end (52a) of the fourth stop member (52) to fix the sliding end (33a) of the back sliding stand (33). [8] A folding pushcart according to claim 7, characterized by that the release assembly (6) comprises the following: a movement fitting (61) which is arranged on the central stand support (31) so as to be movable along the longitudinal direction of the central stand support (31); a front release slide (62) which is arranged within the front lower rod (21) so as to be movable along the longitudinal direction of the front lower rod (21), the projection end (42a) of the second stop element (42) passing through the front release slide (62) and protruding outside the front lower rod (21), the front release slide (62) being designed with the second stop element (42) in an oblique wedge connection; a front pull line (63), one end of which is connected to the movement fitting (61) and the other end of which is connected to the front release slide (62); a third elastic element (64) arranged between the front release slide (62) and the front lower rod (21), the third elastic element (64) being compressed when the front release slide (62) moves towards the lower hinge element (23); when the movement fitting (61) moves in the direction of the folding bracket (1), the front release slider (62) is pulled by the front pull cord (63) so that it is moved in the direction of the lower hinge element (23), wherein the front release slider (62) radially presses the second stop element (42) in the direction of the front lower bar (21) and thereby compresses the first elastic element (43) until the projection end (42a) of the second stop element (42) is retracted into the front lower bar (21) in order to remove the limitation of the sliding movement from the sliding end (32a) of the front sliding support (32) in the direction of the lower hinge element (23). [9] A folding pushcart according to claim 8, characterized by that the release assembly (6) also includes the following: a back release slide (65) which is arranged within the back lower rod (22) so as to be movable along the longitudinal direction of the back lower rod (22), wherein the projection end (52a) of the fourth stop element (52) passes through the back release slide (65) and protrudes outside the back lower rod (22), wherein the back release slide (65) is designed with the fourth stop element (52) in an oblique wedge connection; a retraction line (66), one end of which is connected to the movement fitting (61) and the other end of which is connected to the return release slide (65); a fourth elastic element (67) arranged between the back release slide (65) and the back lower rod (22), the fourth elastic element (67) being compressed when the back release slide (65) moves towards the lower hinge element (23); when the movement fitting (61) moves in the direction of the folding bracket (1), the return release slider (65) is pulled by the retraction line (66) so that it is moved in the direction of the lower hinge element (23), wherein the return release slider (65) radially presses the fourth stop element (52) in the direction of the rear lower rod (22) and thereby compresses the second elastic element (53) until the projection end (52a) of the fourth stop element (52) is retracted into the rear lower rod (22) in order to remove the limitation of the sliding movement from the sliding end (33a) of the return sliding support (33) in the direction of the lower hinge element (23). [10] A folding pushcart according to claim 9, characterized by that the movement fitting (61) comprises a tubular section (611) which is movably nested on the central support (31) and a lifting handle (612) which is located on the tubular section (611) near the folding bracket (1). [11] A folding pushcart according to claim 3, characterized by that the upper hinge element (13) and / or the lower hinge element (23) have a U-shape.

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