Simple bi-fold folding utility cart
By designing the four corner pillars and hinged bases of the folding bike, and combining the support surfaces of the parallelogram and the central support, the problem of insufficient support strength in existing folding bikes has been solved, achieving high-strength support and independent caster settings, thus improving load-bearing capacity and functional versatility.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- YUAN KAIJING
- Filing Date
- 2026-01-07
- Publication Date
- 2026-07-16
AI Technical Summary
Existing folding bikes have insufficient support strength, and the caster assembly layout is limited and cannot be set up independently, affecting load-bearing capacity and usability.
Design a simple bi-folding bicycle with a support scheme consisting of four corner pillars and hinged seats. The parallelogram and the central support provide multiple points of support, and the support surface between the links prevents swaying, achieving high-strength support without the need for connection with the caster assembly.
It improves the support strength of folding bikes, reduces the requirements for material thickness, lowers weight, and maintains the portability and versatility of folding bikes.
Smart Images
Figure CN2026071128_16072026_PF_FP_ABST
Abstract
Description
A simple folding bicycle Technical Field
[0001] This invention relates to the field of folding bicycle technology, specifically a simple bi-folding folding bicycle. Background Technology
[0002] For example, in outdoor recreational activities, small trailers used for carrying goods are very important tools. For ease of use, they are usually designed to be foldable, which makes their structure relatively complex.
[0003] In the prior art, someone has proposed a large-load-bearing folding trolley with application publication number CN 118124649 A. The technical problem that this large-load-bearing folding trolley aims to solve is "overcoming the defects of existing folding trolleys in terms of small load-bearing capacity, small capacity, and single function," rather than for the purpose of simplifying the structure. Therefore, this large-load-bearing folding trolley eliminates the side frame and instead sets two parallel first support beams in the base frame. The first support beam includes a first parallelogram rod group, a second parallelogram rod group, and a connecting seat located between the first parallelogram rod group and the second parallelogram rod group. One end of the first parallelogram rod group is hinged to the corresponding caster assembly, and the other end is hinged to one side of the connecting seat. One end of the second parallelogram rod group is hinged to its corresponding caster assembly, and the other end is hinged to the other side of the connecting seat. Thus, it claims to have the following advantages: 1) The first support beam, through the first parallelogram rod group, The second parallelogram rod assembly and connecting seat work together. When unfolded, the upper support rod stacks and rests against the lower support rod to form a double-rod structure, which can effectively increase the strength of the support beam and thus increase the load-bearing capacity of the trolley. It is also equipped with a reinforcing component, which can further increase the load-bearing capacity of the trolley, and the structure is stable and reliable. It can not only increase the strength of the support beam, but also does not affect the folding function of the base frame assembly, making it very convenient to use. 2) Due to the increased strength of the support beam, this trolley does not need to be equipped with the traditional side frame folding components on both sides. Moreover, both the side frame assembly and the handle assembly can be opened to the outside, adopting a fully open trolley. On the one hand, the size of the loaded items is less restricted, the overall loading capacity is larger, and it is also convenient to load. On the other hand, the trolley can be used as a chair or bed, which is also convenient for pets to get on and off, greatly improving its functionality and making it more functional. 3) The overall size is small after folding, which is convenient for storage.
[0004] As can be seen from the above, in order to increase the support strength when unfolded, the upper support rods are stacked and abut against the lower support rods to form a double-rod structure. Therefore, the side height is only the height of the first support beam. In addition, in order to increase the load-bearing capacity of the trolley, one end of the first parallelogram rod group is hinged to the corresponding caster assembly, and the other end is hinged to one side of the connecting seat; one end of the second parallelogram rod group is hinged to its corresponding caster assembly, and the other end is hinged to the other side of the connecting seat. That is, the two ends of the two first support beams are respectively hinged to and supported by the four caster assemblies, which means that the caster assemblies cannot be arranged independently and must be set in association with the first support beams.
[0005] This application proposes a simple bi-folding folding bicycle that not only has a certain side height and does not require connection with four caster assemblies, but also designs a new support scheme to achieve higher support strength. Summary of the Invention
[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a simple folding bicycle that not only has a certain side height and does not need to be associated with four caster assemblies, but also has a new support scheme designed to obtain higher support strength.
[0007] To solve the above-mentioned technical problems, the present invention proposes a simple bi-folding folding bicycle, including four corner posts located at the four corners of the folding bicycle. The four corner posts are sequentially arranged as a first corner post, a second corner post, a third corner post, and a fourth corner post along the circumference of the base frame. The first and second corner posts located on the front side of the folding bicycle serve as two side rods of the front frame, and the third and fourth corner posts located on the rear side of the folding bicycle serve as two side rods of the rear frame. The lower end of each of the four corner posts is provided with a hinge seat. Between the two hinge seats on the left side of the folding bicycle and between the two hinge seats on the right side of the folding bicycle, there are two side frames composed of two parallelograms distributed front and back. The two adjacent inner ends of the two parallelograms are hinged through a central support, and the outer ends of the two parallelograms are respectively hinged to the corresponding hinge seats.
[0008] Furthermore, there is a gap between the upper and lower connecting rods of the parallelogram.
[0009] Furthermore, each hinge seat has a first upper support surface and a first lower support surface at the outer ends of the upper and lower connecting rods of the parallelogram. When the parallelogram is unfolded into a flat state, the first upper support surface abuts against the lower side of the upper connecting rod located inside the first hinge axis. The first upper support surface is used to prevent the upper connecting rod from continuing to swing downward when the parallelogram is unfolded, thus providing unfolding support. And / or, the first lower support surface abuts against the upper side of the upper connecting rod located outside the first hinge axis. The first lower support surface is used to prevent the tail of the upper connecting rod from continuing to swing downward when the parallelogram is unfolded. The upper link swings upward, thereby preventing the upper link from swinging downward to provide deployment support, and / or, the first upper support surface abuts against the lower side of the lower link located inside the second hinge axis, the first upper support surface being used to prevent the lower link from swinging downward to provide deployment support when the parallelogram is deployed, and / or, the first lower support surface abuts against the upper side of the lower link located outside the second hinge axis, the first lower support surface being used to prevent the tail of the lower link from swinging upward when the parallelogram is deployed, thereby preventing the lower link from swinging downward to provide deployment support.
[0010] Furthermore, each central support is provided with a second upper support surface and a second lower support surface on the inner ends of the upper and lower connecting rods of the parallelogram on both the front and rear sides. When the parallelogram is unfolded into a flat state, the second upper support surface abuts against the lower side of the upper connecting rod located inside the third hinge axis. The second upper support surface is used to prevent the inner end of the upper connecting rod from continuing to swing downward when the parallelogram is unfolded, thus providing unfolding support. And / or, the second lower support surface abuts against the upper side of the upper connecting rod located outside the third hinge axis. The second lower support surface is used to prevent the portion of the upper connecting rod located outside the third hinge axis from being positioned relative to the second lower support surface when the parallelogram is unfolded. The upper support surface continues to swing upward, thereby preventing the upper link from swinging downward to provide deployment support. Alternatively, the second upper support surface abuts against the lower side of the lower link located inside the fourth hinge axis. The second upper support surface is used to prevent the inner end of the lower link from swinging downward during parallelogram deployment, thus providing deployment support. And / or, the second lower support surface abuts against the upper side of the lower link located outside the fourth hinge axis. The second lower support surface is used to prevent the portion of the lower link located outside the fourth hinge axis from swinging upward relative to the second lower support surface during parallelogram deployment, thereby preventing the lower link from swinging downward to provide deployment support.
[0011] As an improvement, the hinged seat has a first support part between the upper and lower outer ends of the two connecting rods of the parallelogram. The upper end of the first support part provides a first upper support surface, and the lower end of the first support part provides a first lower support surface.
[0012] Furthermore, the central support is provided with a second support portion on both the front and rear sides, located between the inner ends of the upper and lower connecting rods of the parallelogram. The upper end of the second support portion provides a second upper support surface, and the lower end of the second support portion provides a second lower support surface.
[0013] As an improvement, the first support part is arranged as a first vertical block, which is distributed between the front and rear of the first hinge shaft and the second hinge shaft;
[0014] Furthermore, the second support is arranged as a second vertical block, which is distributed between the front and rear of the third hinge axis and the fourth hinge axis.
[0015] As an improvement, the first vertical block is fixedly connected to the hinge seat or integrated into the hinge seat;
[0016] Furthermore, the second vertical block is fixedly connected to or integrated with the central support.
[0017] As an improvement, the central support is provided with a stop portion on the upper side of the front end and / or the rear end, and the lower end of the stop portion provides a second lower support surface.
[0018] As an improvement, a synchronizing gear is provided between any two adjacent inner ends of the two parallelograms in the central support, and the two parallelograms are synchronously expanded / contracted through the synchronizing gear.
[0019] As an improvement, the first bottom support includes one or more first cross braces, one end of which is connected to the lower link on the left side of the front frame, and the other end of which is connected to the lower link on the right side of the front frame; the second bottom support includes one or more second cross braces, one end of which is connected to the lower link on the left side of the front frame, and the other end of which is connected to the lower link on the right side of the front frame.
[0020] As an improvement, one or more first longitudinal struts are provided between two adjacent first horizontal struts; one or more second longitudinal struts are provided between two adjacent second horizontal struts.
[0021] As an improvement, a front bottom horizontal brace is provided between the first corner column and the second corner column, and the front bottom horizontal brace is equipped with a front ground wheel, and / or a rear bottom horizontal brace is provided between the third corner column and the fourth corner column, and the rear bottom horizontal brace is equipped with a rear ground wheel.
[0022] As an improvement, a front top horizontal brace is provided between the first corner column and the second corner column. The front top horizontal brace, the first corner column, the second corner column, and the front bottom horizontal brace form the front frame of the square frame. A rear top horizontal brace is provided between the third corner column and the fourth corner column. The rear top horizontal brace, the first corner column, the second corner column, and the front bottom horizontal brace form the rear frame of the square frame.
[0023] Compared with the prior art, the present invention has the following advantages when adopting the above structure: Through structural design, the lower ends of the four corner columns are provided with hinge seats. Between the two hinge seats on the left side of the folding cart and between the two hinge seats on the right side of the folding cart, a side frame composed of two parallelograms distributed front and back is provided. The two adjacent inner ends of the two parallelograms are hinged through a central support, and the outer ends of the two parallelograms are respectively hinged to the corresponding hinge seats. Furthermore, each hinge seat has a first upper support surface and a first lower support surface at the outer ends of the upper and lower connecting rods of the parallelogram. Each central support has upper and lower support surfaces located on the front and rear sides of the parallelogram. The inner end of the connecting rod has a second upper support surface and a second lower support surface. Therefore, when the parallelogram unfolds into a flat state, it will obtain multiple supports from four hinge seats and two middle supports. Because of the support provided by the four hinge seats, the force on the two middle supports can be further distributed to the four hinge seats. In this way, the four hinge seats and the two middle supports form multiple supports that are organically connected around the circumference of the folding vehicle's chassis. For example, there are 16 supports along the circumference of the folding vehicle's chassis. Therefore, on the one hand, it is beneficial to obtain higher support strength, and on the other hand, it is beneficial to reduce the material thickness requirements of each member in the parallelogram, thereby reducing weight without affecting the support performance.
[0024] Meanwhile, since there are hinged seats at the bottom of the four corner columns, there is no need to associate them with the four caster assemblies. Furthermore, since the new support scheme does not require the upper support rod to be stacked and pressed against the lower support rod to form a double rod structure, and there is a gap between the upper and lower connecting rods of the parallelogram, it can have a certain lateral height. Attached Figure Description
[0025] Figure 1 is a three-dimensional schematic diagram of a simple bi-fold model of the present disclosure in the unfolded state of a vehicle.
[0026] Figure 2 is a top view of a simple folding bicycle disclosed in this invention in its unfolded state.
[0027] Figure 3 is a cross-sectional view along the AA direction.
[0028] Figure 4 is a three-dimensional schematic diagram of a simple bi-folding folding bike in the folded state.
[0029] Figure 5 is a three-dimensional schematic diagram of a simple bi-fold model of this disclosure when it is folded in the unfolded state of a car and equipped with a cloth bag, viewed from the top side.
[0030] Figure 6 is a three-dimensional schematic diagram of a simple bi-fold model of this disclosure when it is unfolded in a car and equipped with a cloth bag, viewed from the bottom side.
[0031] Figure 7 is a right view of a simplified bi-fold model of this disclosure when folded in the unfolded state of a vehicle and equipped with ground wheels.
[0032] Figure 8 is a front view of a simplified bi-fold model of this disclosure when folded in the unfolded state and equipped with ground wheels.
[0033] Figure 9 is a cross-sectional view of a simple folding version of the present disclosure in the unfolded state of the vehicle, with three supports at the hinge seat (the cross-sectional position is consistent with the AA direction).
[0034] As shown in the figure, 1. Hinge seat, 2. First hinge shaft, 3. Second hinge shaft, 4. Middle support, 5. Third hinge shaft, 6. Fourth hinge shaft, 7. First upper support surface, 8. First lower support surface, 9. Second upper support surface, 10. Second lower support surface, 11. Strap, 12. Stopping part, 13. Synchronizing gear, 14. Upper connecting rod, 15. Lower connecting rod, 16. First cross brace, 17. Second cross brace. 18. First longitudinal support rod; 19. Second longitudinal support rod; 20. Front bottom horizontal support rod; 21. Rear bottom horizontal support rod; 22. Front top horizontal support rod; 23. Rear top horizontal support rod; 24. First corner post; 25. Second corner post; 26. Third corner post; 27. Fourth corner post; 28. Cloth bag; 29. Front ground wheel; 30. Rear ground wheel; 31. First vertical block; 32. Second vertical block; 33. Handle. Detailed Implementation
[0035] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The embodiments described below are merely examples, and other obvious variations will arise for those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.
[0036] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.
[0037] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.
[0038] Figures 1 to 7 show a simple bi-folding folding bicycle disclosed in this invention, which includes four corner posts located at the four corners of the folding bicycle. The four corner posts are arranged in sequence along the circumference of the base frame as a first corner post 24, a second corner post 25, a third corner post 26, and a fourth corner post 27. The first corner post 24 and the second corner post 25 located on the front side of the folding bicycle serve as two side posts of the front frame, and the third corner post 26 and the fourth corner post 27 located on the rear side of the folding bicycle serve as two side posts of the rear frame.
[0039] In this example, the front frame is set as a U-shaped structure. Specifically, a front top horizontal brace 22 is provided between the first corner column 24 and the second corner column 25. The front top horizontal brace 22, the first corner column 24, the second corner column 25, and the front bottom horizontal brace 20 form the U-shaped frame front frame. A rear top horizontal brace 23 is provided between the third corner column 26 and the fourth corner column 27. The rear top horizontal brace 23, the first corner column 24, the second corner column 25, and the front bottom horizontal brace 20 form the U-shaped frame rear frame.
[0040] Of course, the front and rear frames can also be other structures, such as X-shaped frame front frame, X-shaped frame rear frame, U-shaped frame front frame, U-shaped frame rear frame, and H-shaped frame front frame, H-shaped frame rear frame, etc.
[0041] As shown in Figures 1 and 3, each of the four corner columns has a hinge seat 1 at its lower end. Between the two hinge seats 1 on the left side of the folding vehicle and between the two hinge seats 1 on the right side of the folding vehicle, there is a side frame composed of two parallelograms distributed front and back. The two inner ends of the two parallelograms are hinged through the middle support 4, and the outer ends of the two parallelograms are respectively hinged to the corresponding hinge seat 1.
[0042] When the hinge seat 1 is hinged, each hinge seat 1 has a first upper support surface 7 and a first lower support surface 8 on the outer ends of the upper and lower connecting rods of the parallelogram. The situation on the right side is shown in Figure 3. Similarly, the left side can also be set in the same way as the right side, that is, the left and right sides are symmetrically set.
[0043] When hinged with the middle support 4, each middle support 4 is provided with a second upper support surface 9 and a second lower support surface 10 on the inner ends of the upper and lower connecting rods of the parallelogram on the front and rear sides. The case on the right side is shown in Figure 3. Similarly, the left side can also be symmetrically arranged with the right side, that is, the left and right sides are symmetrically arranged.
[0044] As shown in Figure 3, taking the hinge seat 1 on the right front side as an example, when the parallelogram unfolds into a flat state, the first upper support surface 7 abuts against the lower side of the upper connecting rod 14 located inside the first hinge axis 2. The first upper support surface 7 is used to prevent the upper connecting rod 14 from continuing to swing downward when the parallelogram unfolds, thus providing unfolding support. The first lower support surface 8 abuts against the upper side of the lower connecting rod 15 located outside the second hinge axis 3. The first lower support surface 8 is used to prevent the tail of the lower connecting rod 15 from continuing to swing upward when the parallelogram unfolds, thereby preventing the lower connecting rod 15 from continuing to swing downward, thus providing unfolding support. This constitutes two supports. Similarly, the hinge seat 1 on the left front side, the hinge seat 1 on the right rear side, and the hinge seat 1 on the left rear side also have two supports, thus constituting eight supports.
[0045] The support at the hinge seat 1 can also be other structures. For example, the first lower support surface 8 is used to prevent the tail of the upper connecting rod 14 from continuing to swing upward when the parallelogram unfolds, thereby preventing the upper connecting rod 14 from continuing to swing downward to provide unfolding support. The first upper support surface 7 abuts against the lower side of the lower connecting rod 15 located inside the second hinge shaft 3. The first upper support surface 7 is used to prevent the lower connecting rod 15 from continuing to swing downward when the parallelogram unfolds to provide unfolding support. In this way, there are 2 supports at one hinge seat 1, and a total of 8 supports can be achieved at the four hinge seats 1.
[0046] For example, as shown in Figure 9, the first upper support surface 7 abuts against the lower side of the upper connecting rod 14 located inside the first hinge shaft 2. The first upper support surface 7 is used to prevent the upper connecting rod 14 from continuing to swing downward when the parallelogram is unfolded, thus providing unfolding support. The first lower support surface 8 abuts against the upper side of the upper connecting rod 14 located outside the first hinge shaft 2. The first lower support surface 8 is used to prevent the tail of the upper connecting rod 14 from continuing to swing upward when the parallelogram is unfolded, thereby preventing the upper connecting rod 14 from continuing to swing downward, thus providing unfolding support. The first lower support surface 8 abuts against the upper side of the lower connecting rod 15 located outside the second hinge shaft 3. The first lower support surface 8 is used to prevent the tail of the lower connecting rod 15 from continuing to swing upward when the parallelogram is unfolded, thereby preventing the lower connecting rod 15 from continuing to swing downward, thus providing unfolding support. In this way, there can be as many as 3 supports at one hinge seat 1, and a total of 12 supports can be achieved at the four hinge seats 1.
[0047] For example, the first lower support surface 8 abuts against the upper side of the upper connecting rod 14 located outside the first hinge shaft 2. The first lower support surface 8 is used to prevent the tail of the upper connecting rod 14 from continuing to swing upward when the parallelogram is unfolded, thereby preventing the upper connecting rod 14 from continuing to swing downward to provide unfolding support. The first upper support surface 7 abuts against the lower side of the lower connecting rod 15 located inside the second hinge shaft 3. The first upper support surface 7 is used to prevent the lower connecting rod 15 from continuing to swing downward when the parallelogram is unfolded to provide unfolding support. The first lower support surface 8 abuts against the upper side of the lower connecting rod 15 located outside the second hinge shaft 3. The first lower support surface 8 is used to prevent the tail of the lower connecting rod 15 from continuing to swing upward when the parallelogram is unfolded, thereby preventing the lower connecting rod 15 from continuing to swing downward to provide unfolding support. In this way, there can be as many as 3 supports at one hinge seat 1, and a total of 12 supports can be achieved at the four hinge seats 1.
[0048] For example, the first upper support surface 7 abuts against the lower side of the upper connecting rod 14 located inside the first hinge shaft 2. The first upper support surface 7 is used to prevent the upper connecting rod 14 from continuing to swing downward when the parallelogram unfolds, thus providing unfolding support. The first lower support surface 8 abuts against the upper side of the upper connecting rod 14 located outside the first hinge shaft 2. The first lower support surface 8 is used to prevent the tail of the upper connecting rod 14 from continuing to swing upward when the parallelogram unfolds, thereby preventing the upper connecting rod 14 from continuing to swing downward, thus providing unfolding support. The first upper support surface 7 abuts against the lower connecting rod 15 located at the second hinge shaft 2. The lower inner side of shaft 3 abuts against each other. The first upper support surface 7 is used to prevent the lower connecting rod 15 from continuing to swing downward when the parallelogram unfolds, so as to play a role in unfolding support. The first lower support surface 8 abuts against the upper side of the lower connecting rod 15 located outside the second hinge shaft 3. The first lower support surface 8 is used to prevent the tail of the lower connecting rod 15 from continuing to swing upward when the parallelogram unfolds, thereby preventing the lower connecting rod 15 from continuing to swing downward to play a role in unfolding support. In this way, there can be as many as 4 supports at one hinge seat 1, so the four hinge seats 1 can have a total of 16 supports.
[0049] As shown in Figure 3, taking the right-side middle support 4 as an example, when the parallelogram unfolds into a flat state, the second upper support surface 9 abuts against the lower side of the upper connecting rod 14 located inside the third hinge axis 5. The second upper support surface 9 is used to prevent the inner end of the upper connecting rod 14 from continuing to swing downward when the parallelogram unfolds, thus providing unfolding support. The second lower support surface 10 abuts against the upper side of the lower connecting rod 15 located outside the fourth hinge axis 6. The second lower support surface 10 is used to prevent the part of the lower connecting rod 15 located outside the fourth hinge axis 6 from continuing to swing upward relative to the second lower support surface 10 when the parallelogram unfolds, thereby preventing the lower connecting rod 15 from continuing to swing downward, thus providing unfolding support. In this way, since the middle support 4 is designed with two parallelograms distributed front and back, four supports are formed at one middle support 4, and a total of eight supports can be achieved at two middle supports 4.
[0050] The support at the middle support 4 can also be other structures. For example, the second lower support surface 10 abuts against the upper side of the upper connecting rod 14 located outside the third hinge axis 5. The second lower support surface 10 is used to prevent the part of the upper connecting rod 14 located outside the third hinge axis 5 from continuing to swing upward relative to the second lower support surface 10 when the parallelogram unfolds, thereby preventing the upper connecting rod 14 from continuing to swing downward to play an unfolding support role. The second upper support surface 9 abuts against the lower side of the lower connecting rod 15 located inside the fourth hinge axis 6. The second upper support surface 9 is used to prevent the inner end of the lower connecting rod 15 from continuing to swing downward to play an unfolding support role when the parallelogram unfolds. In this way, four supports are formed at one middle support 4, and a total of eight supports can be achieved for two middle supports 4.
[0051] For example, the second upper support surface 9 abuts against the lower side of the upper connecting rod 14 located inside the third hinge axis 5. The second upper support surface 9 is used to prevent the inner end of the upper connecting rod 14 from continuing to swing downward when the parallelogram unfolds, thus providing unfolding support. The second lower support surface 10 abuts against the upper side of the upper connecting rod 14 located outside the third hinge axis 5. The second lower support surface 10 is used to prevent the portion of the upper connecting rod 14 located outside the third hinge axis 5 from continuing to swing upward relative to the second lower support surface 10 when the parallelogram unfolds, thereby preventing... The upper link 14 continues to swing downward to provide expansion support. The second lower support surface 10 abuts against the upper side of the lower link 15 located outside the fourth hinge axis 6. The second lower support surface 10 is used to prevent the part of the lower link 15 located outside the fourth hinge axis 6 from continuing to swing upward relative to the second lower support surface 10 when the parallelogram is expanded, thereby preventing the lower link 15 from continuing to swing downward to provide expansion support. In this way, 6 supports are formed at one middle support 4, and a total of 12 supports can be achieved by the two middle supports 4.
[0052] For example, the second upper support surface 9 abuts against the lower side of the upper connecting rod 14 located inside the third hinge axis 5. The second upper support surface 9 is used to prevent the inner end of the upper connecting rod 14 from continuing to swing downward when the parallelogram is unfolded, so as to play a role in unfolding support. The second upper support surface 9 abuts against the lower side of the lower connecting rod 15 located inside the fourth hinge axis 6. The second upper support surface 9 is used to prevent the inner end of the lower connecting rod 15 from continuing to swing downward when the parallelogram is unfolded, so as to play a role in unfolding support. The second lower support surface 10 abuts against the upper side of the lower connecting rod 15 located outside the fourth hinge axis 6. The second lower support surface 10 is used to prevent the part of the lower connecting rod 15 located outside the fourth hinge axis 6 from continuing to swing upward relative to the second lower support surface 10 when the parallelogram is unfolded, so as to prevent the lower connecting rod 15 from continuing to swing downward, so as to play a role in unfolding support. In this way, 6 supports are also formed at one middle support 4, so the two middle supports 4 can achieve a total of 12 supports.
[0053] For example, the second upper support surface 9 abuts against the lower side of the upper connecting rod 14 located inside the third hinge axis 5. The second upper support surface 9 is used to prevent the inner end of the upper connecting rod 14 from continuing to swing downward when the parallelogram unfolds, thus providing unfolding support. The second lower support surface 10 abuts against the upper side of the upper connecting rod 14 located outside the third hinge axis 5. The second lower support surface 10 is used to prevent the portion of the upper connecting rod 14 located outside the third hinge axis 5 from continuing to swing upward relative to the second lower support surface 10 when the parallelogram unfolds, thereby preventing the upper connecting rod 14 from continuing to swing downward, thus providing unfolding support. The second upper support surface 9 abuts against the lower side of the lower connecting rod 15 located inside the fourth hinge axis 5. The lower inner side of the hinge shaft 6 abuts against each other. The second upper support surface 9 is used to prevent the inner end of the lower connecting rod 15 from continuing to swing downward when the parallelogram unfolds, so as to play a role in unfolding support. The second lower support surface 10 abuts against the upper side of the lower connecting rod 15 located outside the fourth hinge shaft 6. The second lower support surface 10 is used to prevent the part of the lower connecting rod 15 located outside the fourth hinge shaft 6 from continuing to swing upward relative to the second lower support surface 10 when the parallelogram unfolds, so as to prevent the lower connecting rod 15 from continuing to swing downward, so as to play a role in unfolding support. In this way, 8 supports are formed at one middle support 4, and the two middle supports 4 can reach a total of 16 supports.
[0054] As can be seen from the above, the proposed solution achieves multiple supports along the circumference of the folding vehicle's chassis through a new support scheme, consisting of four articulated seats and two central supports.
[0055] In this example, there is a gap between the upper and lower connecting rods of the parallelogram. The gap gives the upper connecting rod 14 a certain height, thus forming a certain side with the lower connecting rod 15. When the cloth bag 28 is installed, the cloth bag 28 and the upper connecting rod 14 together provide a certain side blocking effect.
[0056] In some embodiments, as shown in FIG3, the hinge seat 1 has a first support portion between the upper and lower outer ends of the two connecting rods of the parallelogram, the upper end of the first support portion provides a first upper support surface 7, and the lower end of the first support portion provides a first lower support surface 8; and the middle support 4 has a second support portion on both the front and rear sides, located between the upper and lower inner ends of the two connecting rods of the parallelogram, the upper end of the second support portion provides a second upper support surface 9, and the lower end of the second support portion provides a second lower support surface 10. This results in a more compact structure, which helps to reduce volume.
[0057] Furthermore, the first support portion is arranged as a first vertical block 31, which is distributed between the first hinge shaft 2 and the second hinge shaft 3; and the second support portion is arranged as a second vertical block 32, which is distributed between the third hinge shaft 5 and the fourth hinge shaft 6. This vertical block arrangement ensures that, under stress, the first upper support surface 7 and the first lower support surface 8 cancel each other out, avoiding unidirectional stress and providing better mechanical support. Additionally, it simplifies the structure and facilitates manufacturing.
[0058] Furthermore, the first vertical block 31 is fixedly connected to or integrally formed with the hinge seat 1; and the second vertical block 32 is fixedly connected to or integrally formed with the central support 4. Preferably, the first vertical block 31 and the hinge seat 1 are manufactured by injection molding, and the second vertical block 32 and the hinge seat 1 are manufactured by injection molding. This facilitates manufacturing, reduces costs, and lightens weight.
[0059] In some embodiments, the middle support 4 is provided with a stop portion 12 on the upper side of the front end and / or the rear end, and the lower end of the stop portion 12 provides a second lower support surface 10. As shown in FIG3, the stop portion 12 is formed by bending downward, i.e., bending portion, and the lower end surface of the bending portion provides a second lower support surface 10, which is an optional technical solution.
[0060] In some embodiments, a synchronizing gear 13 is provided between any two adjacent inner ends of the two parallelograms on the central support 4, and the two parallelograms are synchronously unfolded / folded through the synchronizing gear 13. The synchronously folded shape is shown in Figure 4.
[0061] In this example, as shown in Figure 3, a synchronizing gear is installed at each of the two adjacent inner ends of the two parallelogram-shaped lower connecting rods, and the two synchronizing gears mesh with each other. Of course, other structures are also possible, such as installing a synchronizing gear at each of the two adjacent inner ends of the two parallelogram-shaped upper connecting rods, and the two synchronizing gears meshing with each other.
[0062] In some embodiments, as shown in Figures 1 and 2, the first bottom support rod includes one or more first horizontal support rods 16. One end of the first horizontal support rod 16 is connected to the lower connecting rod 15 on the left side of the front frame, and the other end of the first horizontal support rod 16 is connected to the lower connecting rod 15 on the right side of the front frame. The second bottom support rod includes one or more second horizontal support rods 17. One end of the second horizontal support rod 17 is connected to the lower connecting rod 15 on the left side of the front frame, and the other end of the second horizontal support rod 17 is connected to the lower connecting rod 15 on the right side of the front frame. In this way, the four lower connecting rods 15 and the corresponding first horizontal support rods 16 and second horizontal support rods 17 form a strong base frame, and the base frame provides a good range of support for the items.
[0063] Furthermore, one or more first longitudinal struts 18 are provided between two adjacent first horizontal struts 16; one or more second longitudinal struts 19 are provided between two adjacent second horizontal struts 17.
[0064] In some embodiments, as shown in Figures 5 and 6, the cloth bag 28 has a handle 33 at the inner bottom and a strap 11 at the outer bottom. The strap 11 connects the adjacent first horizontal support rod 16 and second horizontal support rod 17 located in the middle. By pulling the handle 33, the cloth bag 28 pulls the first horizontal support rod 16 and second horizontal support rod 17 upward through the strap 11, thereby indirectly driving the lower connecting rod 15 upward, so that the entire folding vehicle is folded up to achieve the purpose of folding. The reverse movement unfolds the vehicle.
[0065] In some embodiments, as shown in FIG7, a front bottom cross brace 20 is provided between the first corner column 24 and the second corner column 25, and a front ground wheel 29 is provided on the front bottom cross brace 20. A rear ground wheel 30 is provided at the lower end of the third corner column 26 and the fourth corner column 27 or at the hinge seat 1. It can be seen that in this disclosure, the arrangement of the ground wheel, or caster, is independent of the arrangement of the upper and lower connecting rods of the parallelogram.
[0066] Of course, other structures are also possible. For example, a front bottom cross brace 20 is provided between the first corner column 24 and the second corner column 25, and a front ground wheel 29 is provided on the front bottom cross brace 20. A rear bottom cross brace 21 is provided between the third corner column 26 and the fourth corner column 27, and a rear ground wheel 30 is provided on the rear bottom cross brace 21.
[0067] For example, the lower end of the first corner column 24 and the second corner column 25 or the hinge seat 1 is provided with a front ground wheel 29, and a rear bottom horizontal support rod 21 is provided between the third corner column 26 and the fourth corner column 27, and a rear ground wheel 30 is provided on the rear bottom horizontal support rod 21.
[0068] As shown in Figures 1 and 4, by adaptively matching the lengths of the four corner posts, the lower connecting rod 15, and the upper connecting rod 14, the upper and lower ends of the folding vehicle can be made to be at approximately the same height after folding, thus forming a final folded shape that is almost rectangular. This is of great benefit to packaging and logistics, and helps to significantly reduce packaging and logistics costs.
[0069] When understanding this invention, the above structure can be understood in conjunction with other embodiments / figures if necessary, and will not be elaborated here.
[0070] The above description is merely an optional specific embodiment of the present invention. All equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included within the scope of this patent application.
Claims
1. A simple bi-folding folding bicycle, comprising four corner posts disposed at the four corners of the folding bicycle, the four corner posts being sequentially arranged along the circumference of the base frame as a first corner post (24), a second corner post (25), a third corner post (26), and a fourth corner post (27), the first corner post (24) and the second corner post (25) located on the front side of the folding bicycle serving as two side posts of the front frame, and the third corner post (26) and the fourth corner post (27) located on the rear side of the folding bicycle serving as two side posts of the rear frame, characterized in that, The lower ends of the four corner columns are provided with hinge seats (1). Between the two hinge seats (1) on the left side of the folding car and between the two hinge seats (1) on the right side of the folding car, there are two side frames composed of two parallelograms distributed in front and behind. The two inner ends of the two parallelograms are hinged through the middle support (4), and the outer ends of the two parallelograms are respectively hinged to the corresponding hinge seats (1). Furthermore, there is a gap between the upper and lower connecting rods of the parallelogram; Furthermore, each hinge seat (1) has a first upper support surface (7) and a first lower support surface (8) on the outer ends of the upper and lower connecting rods of the parallelogram. When the parallelogram is unfolded into a flat state, the first upper support surface (7) abuts against the lower side of the upper connecting rod (14) located inside the first hinge axis (2). The first upper support surface (7) is used to prevent the upper connecting rod (14) from continuing to swing downward when the parallelogram is unfolded, so as to play an unfolding support role. And / or, the first lower support surface (8) abuts against the upper side of the upper connecting rod (14) located outside the first hinge axis (2). The first lower support surface (8) is used to prevent the tail of the upper connecting rod (14) from continuing to swing downward when the parallelogram is unfolded. The upper link (14) swings upward to prevent the upper link (14) from swinging downward to provide deployment support, and / or the first upper support surface (7) abuts against the lower side of the lower link (15) located inside the second hinge axis (3). The first upper support surface (7) is used to prevent the lower link (15) from swinging downward to provide deployment support when the parallelogram is deployed, and / or the first lower support surface (8) abuts against the upper side of the lower link (15) located outside the second hinge axis (3). The first lower support surface (8) is used to prevent the tail of the lower link (15) from swinging upward when the parallelogram is deployed, thereby preventing the lower link (15) from swinging downward to provide deployment support. Furthermore, each of the middle supports (4) is provided with a second upper support surface (9) and a second lower support surface (10) on the inner ends of the upper and lower connecting rods of the parallelogram on both the front and rear sides. When the parallelogram is unfolded into a flat state, the second upper support surface (9) abuts against the lower side of the upper connecting rod (14) located inside the third hinge axis (5). The second upper support surface (9) is used to prevent the inner end of the upper connecting rod (14) from continuing to swing downward when the parallelogram is unfolded, so as to play a role in unfolding support. And / or, the second lower support surface (10) abuts against the upper side of the upper connecting rod (14) located outside the third hinge axis (5). The second lower support surface (10) is used to prevent the part of the upper connecting rod (14) located outside the third hinge axis (5) from being opposite to the second lower support surface (10) when the parallelogram is unfolded. 0) Continue to swing upward, thereby preventing the upper link (14) from swinging downward to provide deployment support, and / or, the second upper support surface (9) abuts against the lower side of the lower link (15) located inside the fourth hinge axis (6), the second upper support surface (9) is used to prevent the inner end of the lower link (15) from swinging downward to provide deployment support when the parallelogram is deployed, and / or, the second lower support surface (10) abuts against the upper side of the lower link (15) located outside the fourth hinge axis (6), the second lower support surface (10) is used to prevent the portion of the lower link (15) located outside the fourth hinge axis (6) from swinging upward relative to the second lower support surface (10) when the parallelogram is deployed, thereby preventing the lower link (15) from swinging downward to provide deployment support.
2. The simplified bi-folding folding bike according to claim 1, characterized in that, The hinge seat (1) has a first support part between the upper and lower outer ends of the two connecting rods of the parallelogram. The upper end of the first support part provides a first upper support surface (7), and the lower end of the first support part provides a first lower support surface (8). Furthermore, the middle support (4) is provided with a second support part between the inner ends of the upper and lower connecting rods of the parallelogram on the front and rear sides. The upper end of the second support part provides a second upper support surface (9), and the lower end of the second support part provides a second lower support surface (10).
3. The simplified bi-folding folding bike according to claim 2, characterized in that, The first support part is arranged as a first vertical block (31), which is distributed between the first hinge shaft (2) and the second hinge shaft (3). Furthermore, the second support is provided as a second vertical block (32), which is distributed between the third hinge shaft (5) and the fourth hinge shaft (6).
4. The simplified bi-folding folding bike according to claim 3, characterized in that, The first vertical block (31) is fixedly connected to the hinge seat (1) or integrated into the structure. Furthermore, the second vertical block (32) is fixedly connected to the central support (4) or integrated into the structure.
5. The simplified bi-folding folding bike according to claim 1, characterized in that, The middle support (4) has an abutment (12) on the upper side of the front end and / or the rear end, and the lower end of the abutment (12) provides a second lower support surface (10).
6. The simplified bi-folding folding bike according to claim 1, 2, 3, 4, or 5, characterized in that, In the middle support (4), a synchronous gear (13) is provided between any two adjacent inner ends of the two parallelograms, and the two parallelograms are synchronously unfolded / folded through the synchronous gear (13).
7. The simplified bi-folding folding bike according to claim 1, characterized in that, The underframe includes a first bottom support rod, which includes one or more first horizontal support rods (16). One end of the first horizontal support rod (16) is connected to the lower connecting rod (15) on the left side of the front frame, and the other end of the first horizontal support rod (16) is connected to the lower connecting rod (15) on the right side of the front frame. The underframe also includes a second bottom support rod, which includes one or more second horizontal support rods (17). One end of the second horizontal support rod (17) is connected to the lower connecting rod (15) on the left side of the front frame, and the other end of the second horizontal support rod (17) is connected to the lower connecting rod (15) on the right side of the front frame.
8. The simplified bi-folding folding bike according to claim 7, characterized in that, One or more first longitudinal struts (18) are provided between two adjacent first horizontal struts (16); one or more second longitudinal struts (19) are provided between two adjacent second horizontal struts (17).
9. The simplified bi-folding folding bike according to claim 1, characterized in that, A front bottom horizontal brace (20) is provided between the first corner column (24) and the second corner column (25), and a front ground wheel (29) is provided on the front bottom horizontal brace (20). A rear bottom horizontal brace (21) is provided between the third corner column (26) and the fourth corner column (27), and a rear ground wheel (30) is provided on the rear bottom horizontal brace (21).
10. The simplified bi-folding folding bike according to claim 9, characterized in that, A front top horizontal brace (22) is provided between the first corner column (24) and the second corner column (25). The front top horizontal brace (22), the first corner column (24), the second corner column (25), and the front bottom horizontal brace (20) form the front frame of the square frame. A rear top horizontal brace (23) is provided between the third corner column (26) and the fourth corner column (27). The rear top horizontal brace (23), the first corner column (24), the second corner column (25), and the front bottom horizontal brace (20) form the rear frame of the square frame.