Handcart folding and unfolding structure

Abstract

The utility model discloses a folding and unfolding structure of a handcart, which is characterized in that a handle tube, a supporting tube and a linkage rod are arranged on a handcart frame, a track is arranged on the inner side of the supporting tube, a sliding part and an elastic part are arranged on the linkage rod, and a first limiting part and a second limiting part are arranged between the linkage rod and the supporting tube. The first limiting part is separated from the second limiting part, then the handle pipe, the linkage rod and the sliding part can fall down due to gravity to enable the handle pipe to be close to the supporting pipe to achieve the automatic folding function, and in the process, due to the existence of the sliding part, the handle pipe can fall to the bearing position of the supporting pipe more smoothly; in a similar way, when the frame is unfolded, on the basis of the sliding component, the elastic component on the linkage rod drives the sliding component on the linkage rod to slide on the track through springback, so that the handle pipe is driven to rotate until the first locking part and the second locking part are locked and the handle pipe returns to the initial position, and the automatic unfolding effect is achieved.

Description

Technical Field

[0001] The utility model relates to the field of trolleys, and in particular to a foldable and unfoldable structure of a trolley. Background Art

[0002] Folding strollers are mainly designed as a carrying and moving tool for infants and children, which is convenient for adults to take infants and children out for daily play. At the same time, they can also appropriately hold some light small items when shopping. Folding strollers are popular in daily life because they are convenient for daily activities and can be carried easily. During use, the folding function of folding strollers becomes the main reference point for consumers to choose. In the existing technology, folding strollers often use the rotation of the lever arm and the joint seat as a folding means, and the rotation process of this folding method is often not smooth. Whether it is folding or unfolding, it is relatively laborious to use. That is, the strollers in the existing technology have a technical defect of insufficient folding smoothness because it is relatively laborious during the folding and unfolding activities, which needs to be solved. Utility Model Content

[0003] The main purpose of the utility model is to provide a folding and unfolding structure of a trolley, aiming to solve the technical problem of the trolleys in the prior art that the folding and unfolding processes are relatively laborious and the folding smoothness is insufficient.

[0004] To achieve the above-mentioned purpose, the utility model proposes a folding and unfolding structure of a trolley, including a handle tube and a support tube arranged on the frame, the handle tube is movably connected to the support tube through a first joint seat, a track is provided on the inner side of the support tube, and a sliding component that can move within its channel range is installed on the track, a connecting rod is provided between the handle tube and the support tube, one end of the connecting rod is hinged to the handle tube, and the other end is movably connected to the track of the support tube through the sliding component.

[0005] Furthermore, the sliding component is provided with a sliding portion, and the sliding portion abuts against the rail.

[0006] Furthermore, the sliding component is provided with at least one roller on one side of the track for enhancing the smoothness of the movement of the track.

[0007] Furthermore, at least a portion of the roller's profile extends from the sliding component, and the portion of the roller's profile that extends out abuts against the track.

[0008] Furthermore, a first locking portion is provided on the track, and a second locking portion is provided on the sliding component at a position corresponding to the first locking portion on one side of the track for limiting the sliding component from sliding in the track. In a non-sliding state, the first locking portion abuts against the second locking portion.

[0009] Furthermore, the first locking portion is a telescopic protrusion, the second locking portion is a groove formed on the sliding component corresponding to the protrusion, and the protrusions are connected by a lead provided in the frame.

[0010] Furthermore, a second joint seat is provided between the connecting rod and the sliding component, the second joint seat includes a first mounting portion for connecting to the sliding component, and the sliding component is provided with a second mounting portion for connecting to the first mounting portion on one side of the handle tube.

[0011] Furthermore, an elastic component is provided around the second joint seat for enhancing the smoothness when the connecting rod and the sliding component move. The first end of the elastic component is provided on the connecting rod, and the second end is provided on the sliding component.

[0012] Furthermore, the connecting rod is provided with a first embedding groove, the sliding component is provided with a second embedding groove, the first end of the elastic component is embedded in the first embedding groove, and the second end is embedded in the second embedding groove.

[0013] Furthermore, a traction rod is connected between the second joint seats on both sides of the frame to achieve parallel movement of the sliding components on both sides.

[0014] The technical solution of the utility model is provided with a handlebar tube, a support tube and a connecting rod on the bicycle frame, a track is provided on the inner side of the support tube, a sliding component and an elastic component are installed on the connecting rod, and a first limiting part and a second limiting part are further provided between the connecting rod and the support tube. When the bicycle frame is folded, the first limiting part and the second limiting part are disengaged, and then the handlebar tube, the connecting rod and the sliding component will fall due to gravity and move the handlebar tube toward the support tube to realize the automatic folding function. In this process, due to the existence of the sliding component, the handlebar tube can fall more smoothly to the bearing position of the support tube; similarly, when the bicycle frame is folded, the first limiting part and the second limiting part are disengaged. When the frame is unfolded, on the basis of the sliding component, the elastic component on the connecting rod drives the sliding component on the connecting rod to slide on the track through rebound, thereby driving the handlebar tube to rotate until the first locking part and the second locking part are locked, and the handlebar tube returns to the initial position, thereby realizing the automatic unfolding effect. The sliding component and the elastic component both produce an automation effect during the folding process, which can improve the smoothness of the folding process of the frame. Due to its automation performance, the utility model has the beneficial technical effect of improving the folding smoothness regardless of whether it is during the folding or unfolding activities. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model located on a trolley;

[0016] Figure 2 Decomposition of the local structure of the utility model Figure 1 ;

[0017] Figure 3 Decomposition of the local structure of the utility model Figure 2 ;

[0018] Figure 4 Schematic diagram of the planar structure of the connecting rod and the sliding component;

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the sliding component.

[0020] The above drawings include the following reference numerals:

[0021] 1. Frame; 11. Handlebar tube; 12. Support tube; 121. Track; 1211. First locking portion; 13. First joint seat; 14. Second joint seat; 141. First mounting portion; 142. Elastic component; 15. Connecting rod; 151. First embedding groove; 16. Drawbar; 17. Sliding component; 171. Sliding portion; 172. Roller; 173. Second locking portion; 174. Second mounting portion; 175. Second embedding groove; 2. Wheel assembly. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0024] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] The utility model provides a foldable and unfoldable structure of a trolley.

[0026] In the embodiment of the present utility model, Figures 1 to 5 As shown, the folding and unfolding structure of the trolley includes a handlebar tube 11 and a support tube 12 provided on the frame 1, the frame 1 is supported by the wheel set 2, the handlebar tube 11 is movably connected to the support tube 12 through the first joint seat 13, and a track 121 is provided on the inner side of the support tube 12. It can be understood that the track 121 can be installed on the support tube 12 or can be integrally formed with the support tube 12. A sliding component 17 that can move within the track range is installed on the track 121, and a connecting rod 15 is further provided between the handlebar tube 11 and the support tube 12. One end of the connecting rod 15 is hinged to the handlebar tube 11, and the other end is movably connected to the track 121 through the sliding component 17. The connecting rod 15 is fixedly connected to the sliding component 17. When the frame 1 is folded, the handlebar 11 The handle tube 11, the connecting rod 15 and the sliding component 17 will fall due to gravity, and the handle tube 11 will move closer to the support tube 12 to realize automatic folding. During this process, the sliding component 17 sliding on the track 121 drives the handle tube 11 and the connecting rod 15 to move to improve the falling efficiency; similarly, when the frame 1 is unfolded, the handle tube 11 is lifted up, and the sliding component 17 sliding on the track 121 further drives the movement of the handle tube 11 and the connecting rod 15 to realize the unfolding action. During this process, the elastic component 142 can rebound to further improve the unfolding efficiency. Please refer to the subsequent description of the elastic component 142. In addition, for the limitation of the handle tube 11, please refer to the subsequent description of the first locking part 1211 and the second locking part 173.

[0027] In the embodiment of the present invention, in order to make the sliding member 17 slide more smoothly, the sliding member 17 is provided with a sliding portion 171, and the sliding portion 171 abuts against the track 121. When the sliding member 17 slides to fold the handle tube 11, the sliding portion 171 slides along the direction of the track 121. Figure 2 As shown, the sliding portion 171 is a groove body that can abut against the rail 121. In some other embodiments of the present invention, an equivalent replacement can also be made, that is, the rail 121 is a groove body, and the sliding portion 171 is a protruding structure clamped by the rail 121.

[0028] Furthermore, the sliding component 17 is provided with at least one roller 172 on one side of the track 121 for enhancing the smoothness of the movement of the track 121. Figures 2 to 5 As shown, the sliding component 17 can reduce resistance during sliding through the rollers 172 and is more stable during operation. In addition, when there are more than two rollers 172, the rollers 172 are equally weighted on the sliding component 17. For example, when a roller 172 is symmetrically arranged at both ends of the sliding component 17, the sliding component 17 can have better balance when sliding.

[0029] Specifically, if Figure 5 As shown, the outline of the roller 172 at least partially extends from the sliding component 17, and the extended outline portion of the roller 172 abuts against the track 121. The portion of the roller 172 that docks with the track 121, that is, the upper and lower ends of the sliding component 17 require the roller 172 to partially extend, so as to more effectively reduce the resistance during the sliding process.

[0030] In an embodiment of the present utility model, in order to limit the handle tube 11, a first locking portion 1211 is provided on the track 121, and the sliding component 17 is located on one side of the track 121 and is provided with a second locking portion 173 corresponding to the position of the first locking portion 1211 for limiting the sliding of the sliding component 17 in the track 121. In the non-sliding state, the first locking portion 1211 abuts against the second locking portion 173. This locking structure is part of the existing technology and will not be described in detail here.

[0031] Specifically, the first locking portion 1211 is a telescopic protrusion, and the second locking portion 173 is a groove body formed on the sliding component 17 corresponding to the protrusion. The protrusion is connected by a lead wire (not shown) provided in the frame 1. When the frame 1 needs to be folded, the first locking portion 1211 is pulled by the lead wire inside the frame 1 to disengage it from the second locking portion 173. At this time, the handlebar tube 11, the connecting rod 15 and the sliding component 17 fall downward due to gravity, and eventually the handlebar tube 11 moves closer to the support tube 12 to achieve folding. When the frame 1 needs to be unfolded again, the handlebar tube 11 is lifted, the position of the sliding component 17 is restored, and the first locking portion 1211 and the second locking portion 173 are re-abutted. The handlebar tube 11 is locked in the initial unfolded state due to the abutment of the first locking portion 1211 and the second locking portion 173. This unlocking method is also a prior art and will not be further described here.

[0032] In some preferred embodiments of the present invention, a second joint seat 14 is provided between the connecting rod 15 and the sliding component 17. The second joint seat 14 includes a first mounting portion 141 for connecting the sliding component 17. The sliding component 17 is provided with a second mounting portion 174 for connecting the first mounting portion 141 on one side of the handlebar tube 11. The second joint seat 14 can facilitate the assembly of the sliding component 17 with the connecting rod 15 and other components. In some other embodiments, the sliding component 17 can be directly fixedly connected to the connecting rod 15.

[0033] Specifically, in order to further enhance the folding smoothness, an elastic component 142 is wound around the second joint seat 14 for enhancing the smoothness when the connecting rod 15 and the sliding component 17 move. The first end of the elastic component 142 is arranged on the connecting rod 15, and the second end is arranged on the sliding component 17. The elastic component 142 is preferably a torsion spring. In some other embodiments, it can be replaced by conventional elastic components such as springs, rubbers, and elastic fibers. The replacement of the elastic component 142 is part of the existing technology and will not be further elaborated here.

[0034] More specifically, in order to enable the elastic component 142 to better drive the movement of the connecting rod 15 and the sliding component 17, the connecting rod 15 is provided with a first embedding groove 151, and the sliding component 17 is provided with a second embedding groove 175. The first end of the elastic component 142 is embedded in the first embedding groove 151, and the second end is embedded in the second embedding groove 175. When the frame 1 is unfolded, the first and second ends of the elastic component 142 are restricted to the corresponding positions of the connecting rod 15 and the sliding component 17. Therefore, after the connecting rod 15 and the sliding component 17 are compressed due to falling due to gravity, when the frame 1 is unfolded, the elastic potential energy released by their own rebound drives the movement of the connecting rod 15 and the sliding component 17, thereby achieving a smoother rotation process of the handlebar tube 11.

[0035] Specifically, a traction rod 16 is connected between the second joint seats 14 on both sides of the frame 1 for realizing parallel movement of the sliding components 17 on both sides. Through the setting of the traction rod 16, the sliding components 17 on both sides of the frame 1 can move synchronously, so that the handlebar tubes 11 on both sides can be folded synchronously to improve the folding efficiency.

[0036] The following content serves as an explanation of the working principle of this utility model:

[0037] The utility model mainly improves the smoothness of the movement of the handlebar tube 11 and the connecting rod 15 indirectly by sliding the sliding component 17 on the track 121. At the same time, the roller 172 and the elastic component 142 further improve the smoothness of folding. When the frame 1 needs to be folded, the first locking portion 1211 and the second locking portion 173 are disengaged, and then the handlebar tube 11, the connecting rod 15 and the sliding component 17 all fall due to gravity, and finally the handlebar tube 11 is close to the support tube 12 to realize the automatic folding of the frame 1. When it is to be unfolded, the handle tube 11 is lifted up. At this time, based on the sliding component 17, the elastic component 142 promotes the sliding movement of the sliding component 17 on the track 121 through its own rebound, so that the connecting rod 15 drives the handle tube 11 to achieve a smoother rotation action until the first locking part 1211 and the second locking part 173 are docked, and the handle tube 11 rotates to the initial position, thereby realizing automatic unfolding of the frame 1. The utility model has automatic performance in the process of folding and unfolding, thereby improving the smoothness of the folding of the stroller.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A foldable and unfoldable structure of a trolley, comprising a handle tube and a support tube provided on a trolley frame, wherein the handle tube is movably connected to the support tube via a first joint seat, and characterized in that: A track is provided on the inner side of the support tube, and a sliding component that can move within its channel is installed on the track. A connecting rod is provided between the handle tube and the support tube. One end of the connecting rod is hinged to the handle tube, and the other end is movably connected to the track of the support tube through the sliding component.

2. The foldable and unfoldable structure of the trolley according to claim 1, wherein: The sliding component is provided with a sliding portion, and the sliding portion abuts against the rail.

3. The foldable and unfoldable structure of the trolley according to claim 2, wherein: The sliding component is provided with at least one roller on one side of the track for enhancing the smoothness of the movement of the track.

4. The foldable and unfoldable structure of the trolley according to claim 3, wherein: The profile of the roller at least partially extends out of the sliding component, and the extended profile portion of the roller abuts against the track.

5. The foldable and unfoldable structure of the trolley according to claim 1, wherein: A first locking portion is provided on the track, and a second locking portion is provided on the sliding component at one side of the track and corresponding to the position of the first locking portion for limiting the sliding component from sliding in the track. In the non-sliding state, the first locking portion abuts against the second locking portion.

6. The foldable and unfoldable structure of the trolley according to claim 5, wherein: The first locking portion is a telescopic convex block, and the second locking portion is a groove body formed on the sliding component corresponding to the convex block. The convex blocks are connected by a lead wire arranged in the vehicle frame.

7. The foldable and unfoldable structure of the trolley according to claim 1, wherein: A second joint seat is provided between the connecting rod and the sliding component. The second joint seat includes a first mounting portion for connecting to the sliding component. The sliding component is provided with a second mounting portion for connecting to the first mounting portion on one side of the handlebar tube.

8. The foldable and unfoldable structure of the trolley according to claim 7, wherein: An elastic component for enhancing the smoothness of movement of the connecting rod and the sliding component is wound around the second joint seat. The first end of the elastic component is arranged on the connecting rod, and the second end is arranged on the sliding component.

9. The foldable and unfoldable structure of the trolley according to claim 8, wherein: The connecting rod is provided with a first embedding groove, the sliding component is provided with a second embedding groove, the first end of the elastic component is embedded in the first embedding groove, and the second end is embedded in the second embedding groove.

10. The foldable and unfoldable structure of the trolley according to claim 7, wherein: A traction rod for achieving parallel movement of sliding components on both sides is connected between the second joint seats on both sides of the frame.

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