Folding cart

Abstract

The utility model belongs to the technical field of carts, and particularly relates to a folding cart. Comprising a front frame, a rear frame, a side frame and an unlocking mechanism, the side frame is arranged between the front frame and the rear frame and used for unfolding and folding, the unlocking mechanism is used for limiting or releasing limiting of folding of the side frame, and the force application direction for triggering releasing limiting of the unlocking mechanism is the same as the force application direction for folding the side frame. And the unlocking mechanism drives the side frame to be folded after releasing the limitation of the folding of the side frame. According to the folding cart, after external force is applied to trigger the unlocking mechanism to remove folding limitation, the side frame can be directly driven to start to be folded by continuously applying external force in the same direction. A user only needs to exert force in one direction, the dual tasks of unlocking and folding can be completed in succession, and force in other directions does not need to be additionally exerted to drive the cart to be folded.

Description

[Technical Field]

[0002] This application belongs to the field of stroller technology, specifically relating to a folding stroller. [Background Technology]

[0004] In daily life, strollers are a common carrying tool, widely used in shopping, transporting goods, and baby travel. However, the folding mechanism of existing traditional strollers usually uses a separate button to unlock and close the folding mechanism. Users need to locate and press the unlock button, which is usually located in a specific location on the stroller, such as on the side of the frame or near the handle. After pressing the button, the folding mechanism is released, and the user then needs to apply force in another direction to fold the stroller together. However, this method requires the user to apply two forces in different directions simultaneously: one to press the button and another to fold the stroller. These two forces are in different directions, increasing the complexity of the operation and causing users to feel strenuous and inconvenient during operation. Furthermore, because it requires applying force in two directions simultaneously, users often need to use both hands to fold and close the stroller, making it impossible to do so with one hand, greatly limiting the convenience of using the stroller. [Utility Model Content]

[0006] To address the problem of the laborious and inconvenient nature of folding trolleys in the prior art, which requires the simultaneous application of forces in two different directions, this application provides a folding trolley.

[0007] This application is achieved through the following technical solution:

[0008] A folding trolley includes a front frame, a rear frame, a side frame disposed between the front frame and the rear frame for unfolding and folding, and a release mechanism for restricting or releasing the folding of the side frame. The direction of force applied to trigger the release mechanism is the same as the direction of force applied to fold the side frame. After the release mechanism releases the restriction on the folding of the side frame, it drives the side frame to fold.

[0009] As described above, in a folding trolley, the side frame includes a front top rod and a front bottom rod, the front ends of which are pivotally connected to the upper and lower sides of the front frame, respectively; a rear top rod and a rear bottom rod, the rear ends of which are pivotally connected to the upper and lower sides of the rear frame, respectively; a front diagonal rod, the front end of which is pivotally connected to the lower side of the front frame; a rear diagonal rod, the rear end of which is pivotally connected to the lower side of the rear frame; and a pivoting mechanism that connects to the rear end of the front top rod, the front end of the rear top rod, the rear end of the front diagonal rod, and the front end of the rear diagonal rod, respectively, and pivotally connects the four components to each other; and the rear end of the front bottom rod is pivotally connected to the front end of the rear bottom rod.

[0010] As described above, in a folding trolley, the locking mechanism includes a front bottom pivot at the rear end of the front bottom rod, a rear bottom pivot seat at the front end of the rear bottom rod that is pivotally connected to the middle of the front bottom pivot, and a connecting pivot tube between two adjacent front bottom pivots. The connecting pivot tube contains locking pins corresponding to the connecting pivot tubes on both sides. A sliding sleeve connected to the locking pins is fitted on the outer side of the connecting pivot tube. The rear bottom rod has a locking hole for the locking pins to be inserted to restrict the folding of the side frame. An elastic element is provided between the two locking pins. When the folding trolley is in the unfolded state, the front bottom pivot abuts against the rear bottom rod, and the elastic element drives the locking pins to insert into the locking hole.

[0011] As described above, the folding trolley's release mechanism further includes a drive member connected to the locking pin via a pull wire, a sliding groove on the connecting pivot for the drive member to pass through to connect the sliding assembly, and a lifting member connecting the two sliding assemblies.

[0012] As described above, when the lifting member is pulled upward, the two sliding components move closer to each other under the action of force, driving the two driving members in the connecting pivot tube to pull the locking pins on the corresponding sides out of the locking holes to release the restriction on the folding of the side frame. At the same time, the folding of the side frame causes the front frame and the rear frame to move closer to each other to complete the folding of the trolley.

[0013] In the folding trolley described above, the pivoting mechanism is pivotally connected to the front push rod via a front top pivot seat, the front side of the front top pivot seat being pivotally connected to the rear end of the front push rod and the rear side being pivotally connected to the pivoting mechanism; the pivoting mechanism is pivotally connected to the rear push rod via a rear top pivot seat, the rear side of the rear top pivot seat being pivotally connected to the front end of the rear push rod and the front side being pivotally connected to the pivoting mechanism.

[0014] The folding trolley described above further includes a locking mechanism for keeping the folding trolley in a folded state when it is in a folded state. The locking mechanism includes a folding buckle and a folding hook that engages with the folding buckle. The folding buckle is located on the front slant bar, and the folding hook is located on the rear slant bar; or the folding buckle is located on the rear slant bar, and the folding hook is located on the front slant bar.

[0015] As described above, in a folding trolley, the locking pin has a ramp surface near the locking hole.

[0016] In the folding trolley described above, the connecting pivot tube is prismatic in shape, and the driving component and the locking pin are correspondingly prismatic in shape.

[0017] As described above, in a folding trolley, the front top pivot is provided with a front support rod extending downward to pivotally connect with the front bottom rod; the rear top pivot is provided with a rear support rod extending downward to pivotally connect with the rear bottom rod.

[0018] Compared with the prior art, this application has the following advantages:

[0019] This application discloses a folding trolley. When an external force is applied to trigger the release mechanism to release the folding restriction, continuing to apply an external force in the same direction can directly drive the side frame to begin folding. The user only needs to apply a force in one direction to complete both the unlocking and folding tasks sequentially, without needing to apply additional forces in other directions to drive the trolley to fold. [Attached Image Description]

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is the main view of the unfolded state of the embodiments of this application;

[0023] Figure 2 yes Figure 1 A three-dimensional image;

[0024] Figure 3 yes Figure 2 A partially exploded view;

[0025] Figure 4 yes Figure 3 Enlarged view at point A in the middle;

[0026] Figure 5 This is a front view of the retracted state in an embodiment of this application.

Detailed Implementation Methods

[0028] To make the technical problems solved by this application, the technical solutions, and the beneficial effects clearer, this application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0029] Please see Figures 1 to 5A folding trolley includes a front frame 1, a rear frame 2, a side frame 3 disposed between the front frame 1 and the rear frame 2 for unfolding and folding, and a release mechanism 4 for restricting or releasing the folding of the side frame 3. The direction of force applied to release the release mechanism 4 is the same as the direction of force applied to fold the side frame 3. After the release mechanism 4 releases the restriction on the folding of the side frame 3, it drives the side frame 3 to fold.

[0030] This application discloses a folding trolley. When an external force is applied to trigger the release mechanism to release the folding restriction, continuing to apply an external force in the same direction can directly drive the side frame to begin folding. The user only needs to apply a force in one direction to complete both the unlocking and folding tasks sequentially, without needing to apply additional forces in other directions to drive the trolley to fold.

[0031] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the side frame 3 includes a front top rod 31 and a front bottom rod 32, the front ends of which are pivotally connected to the upper and lower sides of the front frame 1, respectively; a rear top rod 33 and a rear bottom rod 34, the rear ends of which are pivotally connected to the upper and lower sides of the rear frame 2, respectively; a front diagonal rod 35, the front end of which is pivotally connected to the lower side of the front frame 1, and a rear diagonal rod 36, the rear end of which is pivotally connected to the lower side of the rear frame 2; and a pivoting mechanism 37 that connects to the rear end of the front top rod 31, the front end of the rear top rod 33, the rear end of the front diagonal rod 35, and the front end of the rear diagonal rod 36, respectively, and pivotally connects the four components to each other; and the rear end of the front bottom rod 32 is pivotally connected to the front end of the rear bottom rod 34.

[0032] In this embodiment, the side frame 3 is designed by cleverly connecting and pivoting the front top rod 31, front bottom rod 32, rear top rod 33, rear bottom rod 34, front diagonal rod 35, and rear diagonal rod 36, forming a flexible and stable structure that allows the folding trolley to remain smooth and stable during unfolding and folding. This ensures that the side frame 3 can stably support the entire trolley when unfolded. The front diagonal rod 35 and rear diagonal rod 36 not only increase the stability of the trolley but also provide necessary guidance and support for the folding process. The pivoting mechanism 37, as a key connection point, pivotally connects the front top rod 31, rear top rod 33, front diagonal rod 35, and rear diagonal rod 36, allowing these rods to move in tandem to achieve the unfolding and folding of the trolley. The rear end of the front bottom rod 32 is pivotally connected to the front end of the rear bottom rod 34, further enhancing the stability and flexibility of the side frame 3. When the trolley needs to be folded, the user releases the folding restriction on the opposite side frame 3 by triggering the release mechanism 4. A force in one direction is then applied, which is transmitted through the pivotal connections of the rods and guides the side frame 3 to fold in an orderly manner. Because all the rods are pivotally connected, they can fold together in a coordinated manner without jamming or interference.

[0033] Furthermore, as a preferred embodiment of this solution and not a limitation, the unlocking mechanism 4 includes a front bottom pivot 41 located at the rear end of the front bottom rod 32, a rear bottom pivot seat 42 pivotally connected to the middle of the front bottom pivot 41 at the front end of the rear bottom rod 34, and a connecting pivot tube 43 located between two adjacent front bottom pivots 41. The connecting pivot tube 43 has locking pins 44 respectively corresponding to the two sides of the connecting pivot tube 43. A sliding sleeve 45 connected to the locking pins 44 is sleeved on the outside of the connecting pivot tube 43. The rear bottom rod 34 has a locking hole 46 for the locking pins 44 to be inserted to restrict the folding of the side frame 3. An elastic member 47 is provided between the two locking pins 44. When the folding trolley is in the unfolded state, the front bottom pivot 41 abuts against the rear bottom rod 34, and the elastic member 47 drives the locking pins 44 to be inserted into the locking hole 46.

[0034] In this embodiment, precise control of the folded state of the side frame 3 is achieved, providing users with a convenient and reliable operating experience. The front bottom pivot 41 is located at the rear end of the front bottom rod 32 and is pivotally connected to the rear bottom pivot seat 42 at the front end of the rear bottom rod 34. This connection method ensures the stability of the side frame 3 in the unfolded state. The connecting pivot tube 43 is located between two adjacent front bottom pivots 41 and contains corresponding locking pins 44 on both sides. Under the action of the elastic element 47 (such as a spring), these locking pins 44 can automatically insert into the locking holes 46 on the rear bottom rod 34, thereby locking the side frame 3 and preventing it from accidentally folding in the unfolded state. The sliding kit 45 is sleeved on the outside of the connecting pivot tube 43 and connected to the locking pins 44. When the folding trolley is in the unfolded state, the front bottom pivot 41 abuts against the rear bottom rod 34, the elastic element 47 is in a compressed state, pushing the locking pins 44 into the locking holes 46, thereby locking the side frame 3. When the user needs to fold or close the trolley, operating the sliding assembly 45 overcomes the elastic force of the elastic element 47, compressing it and pulling the locking pin 44 out of the locking hole 46, thus releasing the lock on the opposite frame 3. Since the sliding assembly 45 is directly connected to the locking pin 44, the user only needs to perform a simple sliding motion to unlock the trolley, without having to press or toggle other complex switches. This design not only simplifies the operation but also improves the accuracy and reliability of the operation.

[0035] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the unlocking mechanism 4 further includes a drive member 49 connected to the locking pin 44 via a pull wire 48, the connecting pivot tube 43 is provided with a sliding groove 431 through which the drive member 49 passes to connect the sliding assembly 45, and a lifting member 451 connecting the two sliding assemblies 45.

[0036] In this embodiment, the drive component 49 is connected to the locking pin 44 via a pull cable 48. This design allows the user to control the movement of the locking pin 44 via the pull cable 48 when operating the sliding assembly 45, reducing the contact area between the locking pin and the inner wall of the connecting pivot tube, thereby reducing friction. The sliding groove 431 is provided on the connecting pivot tube 43, providing clearance for the connection between the drive component 49 and the sliding assembly 45. The lifting component 451 connects the two sliding assemblies 45, allowing the user to simultaneously drive the locking pins 44 on both sides to unlock with a simple lifting action, greatly simplifying the operation process.

[0037] When the user needs to fold or close the trolley, pulling upwards on the lifting element 451 causes the two sliding components 45 to move closer together under pressure. This action is transmitted to the locking pin 44 via the drive element 49 and the pull cable 48, overcoming the elastic force of the elastic element 47 and pulling the locking pin 44 out of the locking hole 46, thereby releasing the lock on the opposite side frame 3. Because the lifting element 451 acts on both sliding components 45 simultaneously, the locking pins 44 on both sides can move synchronously, ensuring the consistency and stability of the unlocking process. This design not only avoids the inconvenience of the user having to operate the locking pins on both sides separately, but also reduces the risk of trolley instability or accidental unfolding due to asynchronous operation.

[0038] Furthermore, as a preferred embodiment of this solution and not a limitation, when the lifting member 451 is pulled upward, the two sliding components 45 move closer to each other under the action of force, driving the two driving members 49 in the connecting pivot tube 43 to pull the locking pins 44 on the corresponding sides out of the locking holes 46 to release the restriction on the folding of the side frame 3. At the same time, the folding of the side frame 3 causes the front frame 1 and the rear frame 2 to move closer to each other to complete the folding of the trolley.

[0039] Furthermore, as a preferred embodiment of this solution and not a limitation, the pivoting mechanism 37 is pivotally connected to the front push rod 31 via a front push pivot seat 371, the front side of the front push pivot seat 371 being pivotally connected to the rear end of the front push rod 31 and the rear side being pivotally connected to the pivoting mechanism 37; the pivoting mechanism 37 is pivotally connected to the rear push rod 33 via a rear push pivot seat 372, the rear side of the rear push pivot seat 372 being pivotally connected to the front end of the rear push rod 33 and the front side being pivotally connected to the pivoting mechanism 37.

[0040] In this embodiment, the front push rod 31 is ensured to rotate around the pivot mechanism 37, thereby enabling the trolley to unfold and fold. The rear side of the rear top pivot 372 is pivotally connected to the front end of the rear push rod 33, and the front side is pivotally connected to the pivot mechanism 37, allowing the rear push rod 33 to also rotate around the pivot mechanism 37. This not only allows the front push rod 31 and the rear push rod 33 to move in coordination, but also provides the necessary flexibility for the folding of the side frame 3. When the trolley needs to unfold, the front push rod 31 and the rear push rod 33 rotate forward and backward respectively under the guidance of the pivot mechanism 37, causing the side frame 3 to unfold and support the entire trolley. When the trolley needs to fold, the front push rod 31 and the rear push rod 33 rotate in opposite directions, causing the side frame 3 to fold together. Due to the presence of the front top pivot 371 and the rear top pivot 372, this rotational movement can be carried out in a stable and controllable manner, without excessive rotation or jamming.

[0041] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a locking mechanism 5 for keeping the folding trolley in a folded state when it is in a folded state. The locking mechanism 5 includes a folding buckle 51 and a folding hook 52 fastened to the folding buckle 51. The folding buckle 51 is provided on the front diagonal bar 35 and the folding hook 52 is provided on the rear diagonal bar 36; or the folding buckle 51 is provided on the rear diagonal bar 36 and the folding hook 52 is provided on the front diagonal bar 35.

[0042] In this embodiment, the folding buckle 51 and the folding hook 52 are respectively disposed on the front diagonal bar 35 and the rear diagonal bar 36, or respectively disposed on the rear diagonal bar 36 and the front diagonal bar 35. When the trolley is folded up, the folding hook 52 can accurately engage with the folding buckle 51, forming a stable locked state. This design not only prevents the trolley from accidentally unfolding during carrying or storage, but also provides excellent fit and mechanical strength for the folding buckle 51 and the folding hook 52. Once engaged, they provide reliable locking force to prevent the trolley from accidentally unfolding. When the trolley needs to be used again, the user only needs to simply unfasten the folding hook 52 from the folding buckle 51 to easily unfold the trolley.

[0043] Furthermore, as a preferred embodiment of this solution and not a limitation, the locking pin 44 is provided with a ramp surface 441 near the locking hole 46.

[0044] In this embodiment, the ramp surface 441 improves operational smoothness. This smooth transition not only reduces wear and jamming between mechanical parts but also enhances the operational stability and durability of the entire unlocking mechanism 4. Especially in cases of frequent trolley use, this design significantly extends the service life of the locking pin 44 and the lock hole 46, reducing the frequency of maintenance and replacement.

[0045] Furthermore, as a preferred embodiment of this solution and not a limitation, the connecting pivot 43 is prismatic in shape, and the driving member 49 and the locking pin 44 are correspondingly prismatic in shape.

[0046] In this embodiment, the prismatic design provides a stable and precise motion guide for the drive member 49 and the locking pin 44. The prismatic arrangement of the drive member 49 and the locking pin 44 allows them to fit tightly with the connecting pivot tube 43 and move along a predetermined trajectory. This prevents rotational deviation of the drive member 49 and the locking pin 44 during movement and ensures that they can accurately transmit force and motion, thereby achieving precise control over the retracted state of the side frame 3.

[0047] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the front top pivot 371 is provided with a front support rod 38 extending downward to pivotally connect with the front bottom rod 32; the rear top pivot 372 is provided with a rear support rod 39 extending downward to pivotally connect with the rear bottom rod 34.

[0048] In this embodiment, an additional support frame is formed, working in conjunction with the original side frame 3 structure. This design, when the cart is unfolded, effectively distributes the load, reducing frame deformation or swaying caused by single-point stress, thereby improving the overall stability of the cart. Especially when carrying heavy items or used on uneven surfaces, this additional support significantly enhances the cart's load-bearing capacity and resistance to bumps.

[0049] The working principle of this embodiment is as follows:

[0050] This application discloses a folding trolley. When an external force is applied to trigger the release mechanism to release the folding restriction, continuing to apply an external force in the same direction can directly drive the side frame to begin folding. The user only needs to apply a force in one direction to complete both the unlocking and folding tasks sequentially, without needing to apply additional forces in other directions to drive the trolley to fold.

[0051] The above are implementation methods provided in conjunction with specific content, and it is not intended that the specific implementation of this application is limited to these descriptions. Any methods or structures that are similar to those of this application, or any technical deductions or substitutions made based on the concept of this application, should be considered within the scope of protection of this application.

Claims

1. A folding stroller, characterized in that, The utility model provides a folding trolley, comprising a front frame (1), a rear frame (2), a side frame (3) arranged between the front frame (1) and the rear frame (2) and used for unfolding and folding, and a release lock mechanism (4) used for limiting or releasing the folding of the side frame (3), the force direction for triggering the release of the release lock mechanism (4) is the same as the force direction for folding the side frame (3), and the release lock mechanism (4) drives the side frame (3) to fold after releasing the folding of the side frame (3).

2. A folding stroller according to claim 1, wherein, The side frame (3) comprises a front top rod (31) and a front bottom rod (32) respectively pivotally connected to the upper side and the lower side of the front frame (1) at front ends, a rear top rod (33) and a rear bottom rod (34) respectively pivotally connected to the upper side and the lower side of the rear frame (2) at rear ends, a front inclined rod (35) pivotally connected to the lower side of the front frame (1) at a front end, a rear inclined rod (36) pivotally connected to the lower side of the rear frame (2) at a rear end, a pivot connection mechanism (37) connected to the rear end of the front top rod (31), the front end of the rear top rod (33), the rear end of the front inclined rod (35) and the front end of the rear inclined rod (36) and pivotally connected to the four, and the rear end of the front bottom rod (32) is pivotally connected to the front end of the rear bottom rod (34).

3. A folding stroller according to claim 2, wherein, The release lock mechanism (4) comprises a front bottom pivot (41) arranged at the rear end of the front bottom rod (32), a rear bottom pivot seat (42) arranged at the front end of the rear bottom rod (34) and pivotally connected to the middle part of the front bottom pivot (41), and a connecting pivot pipe (43) arranged between two adjacent front bottom pivots (41), wherein the connecting pivot pipe (43) is provided with a lock pin (44) arranged on each side of the connecting pivot pipe (43), the outer side of the connecting pivot pipe (43) is provided with a sliding sleeve (45) connected to the lock pin (44), the rear bottom rod (34) is provided with a lock hole (46) into which the lock pin (44) is inserted to limit the folding of the side frame (3), and an elastic element (47) is arranged between the two lock pins (44), when the folding trolley is in an unfolded state, the front bottom pivot (41) abuts against the rear bottom rod (34), and the elastic element (47) drives the lock pin (44) to be inserted into the lock hole (46).

4. A folding stroller according to claim 3, wherein, The release lock mechanism (4) further comprises a driving element (49) connected to the lock pin (44) through a pull wire (48), the connecting pivot pipe (43) is provided with a sliding groove (431) through which the driving element (49) passes to connect the sliding sleeve (45), and a pulling element (451) connects the two sliding sleeves (45).

5. A folding stroller according to claim 4, wherein, When the pulling element (451) is pulled upward, the two sliding sleeves (45) are driven to move close to each other under the action of force, the two driving elements (49) in the connecting pivot pipe (43) respectively drive the lock pins (44) arranged on the two sides to be separated from the lock holes (46) to release the folding of the side frame (3), and at the same time, the folding of the side frame (3) drives the front frame (1) and the rear frame (2) to move close to each other to complete the folding of the folding trolley.

6. A folding stroller according to claim 2, wherein, The pivot joint (37) is pivoted with the front top rod (31) through a front top pivot base (371), the front side of the front top pivot base (371) is pivoted with the rear end of the front top rod (31), the rear side is pivoted with the pivot joint (37); the pivot joint (37) is pivoted with the rear top rod (33) through a rear top pivot base (372), the rear side of the rear top pivot base (372) is pivoted with the front end of the rear top rod (33), the front side is pivoted with the pivot joint (37).

7. A folding stroller according to claim 2, wherein, Also included is a locking mechanism (5) for keeping the folding stroller in the collapsed state when the folding stroller is in the collapsed state, the locking mechanism (5) includes a collapsing buckle (51) and a collapsing hook (52) buckled on the collapsing buckle (51), the collapsing buckle (51) is arranged on the front diagonal rod (35), and the collapsing hook (52) is arranged on the rear diagonal rod (36); or the collapsing buckle (51) is arranged on the rear diagonal rod (36), and the collapsing hook (52) is arranged on the front diagonal rod (35).

8. A folding stroller according to claim 3, wherein, The lock pin (44) is provided with an inclined surface (441) near one end of the lock hole (46).

9. A folding stroller according to claim 4, wherein, The connecting pivot pipe (43) is a prism, and the driving member (49) and the lock pin (44) are correspondingly arranged in the prism shape.

10. The foldable stroller of claim 6, wherein, The front top pivot base (371) is provided with a front support rod (38) extending downward to be pivoted with the front bottom rod (32); the rear top pivot base (372) is provided with a rear support rod (39) extending downward to be pivoted with the rear bottom rod (34).

Images