Simple folding vehicle with stable structure

Abstract

The utility model discloses a simple and easy folding bicycle of stable structure, including first side frame, second side frame, and chassis, first side frame lower part is equipped with first connecting piece, second side frame lower part is equipped with second connecting piece, and the both ends of first lower link and first upper link of chassis are respectively hinged with first connecting piece and intermediate connecting piece, and form first parallelogram deformation structure with first connecting piece and intermediate connecting piece, and the both ends of second lower link and second upper link are respectively hinged with second connecting piece and intermediate connecting piece, and form second parallelogram deformation structure with second connecting piece and intermediate connecting piece, when unfolding state, the both ends of locking piece can be supported on first parallelogram deformation structure and / or second parallelogram deformation structure respectively to prevent first parallelogram deformation structure and second parallelogram deformation structure from deforming. The simple and easy folding bicycle can be locked in the unfolding state, and the stability in the unfolding state is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of folding carts, and more particularly to a simple folding cart with stable structure. Background Technology

[0002] Folding trolleys are mainly used for carrying outdoor equipment such as folding chairs and tents during outdoor activities, making it easy for people to move items. Some folding trolleys on the market, such as the flat-folding trolley with announcement number CN222728021U, have a base frame with two support frames that are hinged together by support rods on both sides of the two support frames. The support rods are connected to the side frames by a crossbar assembly. When the trolley is unfolded, it is supported between the support rods and the side frames by the crossbar assembly to maintain the unfolded state. However, because the crossbar assembly is movable, the base frame is easily folded due to accidental contact, causing the entire trolley to fold and deform. This is especially true when the trolley is empty, as it is prone to folding and deforming, making it inconvenient to move or carry items smoothly. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a simple folding vehicle with a stable structure that can be locked in the unfolded state, greatly improving its stability when unfolded.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A structurally stable simple folding vehicle has an unfolded state and a folded state, including a first side frame, a second side frame, and a base frame. The first side frame has a first connecting member at its lower part, and the second side frame has a second connecting member at its lower part. The base frame includes a first lower rod, a first upper rod, a second lower rod, a second upper rod, an intermediate connecting member, and at least one locking member. The first lower rod and the first upper rod are hinged at both ends to the first connecting member and the intermediate connecting member, respectively, and together with the first connecting member and the intermediate connecting member, form a first parallelogram deformable structure. The second lower rod and the second upper rod are hinged at both ends to the second connecting member and the intermediate connecting member, respectively, and together with the second connecting member and the intermediate connecting member, form a second parallelogram deformable structure. In the unfolded state, the locking member can be supported at both ends on the first parallelogram deformable structure and / or the second parallelogram deformable structure, respectively, to prevent the first parallelogram deformable structure and the second parallelogram deformable structure from deforming.

[0006] Preferably, one of the first lower rod, the first upper rod, the first connecting member, and the intermediate connecting member is provided with a first positioning member, and the other of the first lower rod, the first upper rod, the first connecting member, and the intermediate connecting member is provided with a second positioning member. The first positioning member and the second positioning member are arranged along a first straight line, and the first straight line is arranged at an angle to each side of the first parallelogram deformed structure. In the unfolded state, one end of the locking member is positioned and connected to the first positioning member, and the other end is positioned and connected to the second positioning member.

[0007] Preferably, one of the second lower rod, the second upper rod, the second connecting member, and the intermediate connecting member is provided with a first positioning member, and the other of the second lower rod, the second upper rod, the second connecting member, and the intermediate connecting member is provided with a second positioning member. The first positioning member and the second positioning member are arranged along a second straight line, and the second straight line is arranged at an angle to each side of the second parallelogram deformed structure. In the unfolded state, one end of the locking member is positioned and connected to the first positioning member, and the other end is positioned and connected to the second positioning member.

[0008] Preferably, the first positioning member includes a first positioning shaft, the second positioning member includes a second positioning shaft, and the locking member includes a connecting portion disposed at one end and a hook portion disposed at the other end. The connecting portion is rotatably connected to the first positioning shaft, and the locking member can rotate around the axis of the first positioning shaft between a locked position and an unlocked position. In the locked position, the hook portion is hooked and connected to the second positioning shaft, and in the unlocked position, the hook portion is separated from the second positioning shaft.

[0009] Preferably, the first positioning shaft protrudes outward from the outer side of the base frame, and the first positioning member further includes a first limiting head connected to the outer end of the first positioning shaft. The first limiting head protrudes outward from the outer periphery of the first positioning shaft, and the connecting part is provided with a positioning hole. The locking member is sleeved on the outside of the first positioning shaft through the positioning hole and rotatably connected to the first positioning shaft. After connection, the connecting part is axially limited between the outer side of the base frame and the first limiting head.

[0010] Preferably, the second positioning shaft protrudes outward from the outer side of the base frame, and the second positioning member further includes a second limiting head connected to the outer end of the second positioning shaft. The second limiting head protrudes outward from the outer periphery of the second positioning shaft, and the hook portion has a notch arranged on its side. The locking member extends into the notch through the second positioning shaft and hooks and connects with the second positioning shaft. After connection, the hook portion is axially limited between the outer side of the base frame and the second limiting head.

[0011] Preferably, the locking member further includes an operating part protruding from the outside of the connecting part and / or the hook part, the operating part being used by an operator to rotate the locking member around the first positioning axis.

[0012] Preferably, it further includes a third positioning member disposed on the second lower rod or the second upper rod, the third positioning member including a third positioning shaft; wherein at least one of the connecting parts of the locking member is rotatably connected to the first positioning shaft disposed on the first lower rod or the first upper rod, and in the unfolded state, the hook part can be hooked and connected to the second positioning shaft, and in the folded state, the hook part can be hooked and connected to the third positioning shaft to prevent the first parallelogram deformable structure and the second parallelogram deformable structure from deforming.

[0013] Preferably, the two ends of the first lower rod and the first upper rod are respectively hinged to the first connecting member and the intermediate connecting member via hinge shafts, and the two ends of the second lower rod and the second upper rod are respectively hinged to the second connecting member and the intermediate connecting member via hinge shafts. The first positioning shaft is configured as a partial structure of the hinge shaft, and / or the second positioning shaft is configured as a partial structure of the hinge shaft.

[0014] Preferably, the first lower rod, the first upper rod, the second lower rod, the second upper rod, the intermediate connecting member, and at least one locking member are provided in two sets. The base frame also includes a support rod group, which is connected between the two sets of first upper rods and / or between the two sets of second upper rods and / or between the first lower rods and / or between the two sets of second lower rods.

[0015] The beneficial effects achieved by this utility model are as follows:

[0016] The simplified folding cart provided by this utility model eliminates the need for an additional crossbar assembly between the first and second side frames. When the folding cart is in the unfolded state, it is supported between the first and second side frames by a first parallelogram deformation structure and a second parallelogram deformation structure, thus maintaining the unfolded state. This greatly simplifies the overall structure of the folding cart, reduces its overall weight, and facilitates movement or transport. Furthermore, the deformation of the first and second parallelogram deformation structures allows the folding cart to switch between folded and unfolded states. When the folding cart is in the unfolded state, the locking components at both ends support the first and / or second parallelogram deformation structures respectively, preventing deformation of these structures and thus preventing the base frame supported between the first and second side frames from deforming towards the folded state. This effectively locks the folding cart in the unfolded state, significantly improving its stability and preventing deformation due to accidental contact with the base frame.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the simple folding vehicle according to the first embodiment of this utility model.

[0020] Figure 2 This is a partial structural schematic diagram of the simple folding vehicle according to the first embodiment of this utility model.

[0021] Figure 3 This is a partial exploded view of the structure of the simple folding vehicle according to the first embodiment of this utility model.

[0022] Figure 4 This is a structural diagram of the folded state of the simple folding vehicle according to the first embodiment of this utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the simple folding vehicle according to the second embodiment of the present invention.

[0024] Figure 6 This is a structural schematic diagram of a simple folding vehicle according to the third embodiment of this utility model.

[0025] Figure 7 This is a structural schematic diagram of a simple folding vehicle according to the fourth embodiment of the present invention.

[0026] Figure 8 This is a structural schematic diagram of a simple folding vehicle according to the fifth embodiment of this utility model.

[0027] Figure 9 This is a structural schematic diagram of a simple folding vehicle according to the sixth embodiment of this utility model.

[0028] Figure 10 This is a structural schematic diagram of a simple folding vehicle according to the seventh embodiment of this utility model.

[0029] Reference numerals: First side frame 1, Second side frame 2, Base frame 3, Support rod assembly 30, First lower rod 31, First upper rod 32, Second lower rod 33, Second upper rod 34, Intermediate connector 35, Locking component 36, Connecting part 361, Positioning hole 3611, Hook part 362, Notch 3621, Operating part 363, First positioning component 37, First positioning shaft 371, First limiting head 372, Second positioning component 38, Second positioning shaft 381, Second limiting head 382, ​​Third positioning component 39, Third positioning shaft 391, Third limiting head 392, First connecting component 4, Second connecting component 5. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "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 utility model 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, they should not be construed as limitations on this utility model.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0035] like Figures 1-4 As shown, in the first embodiment of this utility model, a structurally stable simple folding vehicle is provided, which has an unfolded state and a folded state. It includes a first side frame 1, a second side frame 2, and a base frame 3. The first side frame 3 has a first connecting member 4 at its lower part, and the second side frame 2 has a second connecting member 5 at its lower part. The base frame 3 includes a first lower rod 31, a first upper rod 32, a second lower rod 33, a second upper rod 34, an intermediate connecting member 35, and a locking member 36. The first lower rod 31 and the first upper rod 32 are hinged at both ends to the first connecting member 4 and the intermediate connecting member 35, respectively, and together with the first connecting member 4 and the intermediate connecting member 35, form a first parallelogram deformable structure. The second lower rod 33 and the second upper rod 34 are hinged at both ends to the second connecting member 4 and the intermediate connecting member 35, respectively, and together with the second connecting member 4 and the intermediate connecting member 35, form a second parallelogram deformable structure. In the unfolded state, the locking member 36 is supported at both ends on the first parallelogram deformable structure to prevent deformation of the first and second parallelogram deformable structures. The simplified folding cart of this embodiment does not require an additional crossbar assembly between the first side frame 1 and the second side frame 2. When the folding cart is in the unfolded state, it is supported between the first side frame 1 and the second side frame 2 by the first parallelogram deformation structure and the second parallelogram deformation structure, thus maintaining the unfolded state. This greatly simplifies the overall structure of the folding cart, reduces its overall weight, and facilitates movement or transport. The deformation of the first and second parallelogram deformation structures allows the folding cart to switch between the folded and unfolded states. When the folding cart is in the unfolded state, the locking member 36 is supported at both ends on the first parallelogram deformation structure to prevent deformation of the first and second parallelogram deformation structures. This prevents the base frame 3 supported between the first side frame 1 and the second side frame 2 from deforming towards the folded state, thereby locking the folding cart in the unfolded state. This greatly improves the stability of the unfolded state and avoids the folding cart from deforming towards the folded state due to accidental contact with the base frame 3. In this embodiment, only one locking member 36 is provided and supported on the first parallelogram deformable structure. In other embodiments, the locking member 36 may also be supported on the second parallelogram deformable structure, or one end may be supported on the first parallelogram deformable structure and the other end may be supported on the second parallelogram deformable structure. Alternatively, multiple locking members 36 may be provided, all of which can lock the folding vehicle in the unfolded state.

[0036] like Figure 2As shown, in some specific embodiments, a first positioning member 37 is provided on the first lower rod 31, and a second positioning member 38 is provided on the intermediate connecting member 35. The first positioning member 37 and the second positioning member 38 are arranged along a first straight line, and the first straight line is arranged at an angle to each side of the first parallelogram deformable structure. In the unfolded state, one end of the locking member 36 is positioned and connected to the first positioning member 37, and the other end is positioned and connected to the second positioning member 38, so that the locking member 36 can support the first parallelogram deformable structure along the first straight line. Compared with setting the first straight line to be arranged parallel to any two parallel sides of the first parallelogram deformable structure, it can prevent the locking member 36 from moving with the deformation of the first parallelogram deformable structure, thereby improving the stability of the locking member 36 in preventing the first parallelogram deformable structure from deforming.

[0037] like Figure 3 As shown, in some specific embodiments, the first positioning member 37 includes a first positioning shaft 371, and the second positioning member 38 includes a second positioning shaft 381. The locking member 36 includes a connecting portion 361 disposed at one end and a hook portion 362 disposed at the other end. The connecting portion 361 is rotatably connected to the first positioning shaft 371, and the locking member 36 can rotate around the axis of the first positioning shaft 371 between the locked position and the unlocked position. In the locked position, the hook portion 362 is hooked and connected to the second positioning shaft 381, so that the two ends of the locking member 36 are supported between the first lower rod 31 and the intermediate connecting member 35, thereby preventing the first parallelogram deformable structure from deforming and locking the folding vehicle in the unfolded state. In the unlocked position, the hook portion 362 is separated from the second positioning shaft 381, thereby allowing the first parallelogram deformable structure to deform and enabling the folding vehicle to switch between the unfolded state and the folded state. In this embodiment, the operator can switch between the locked and unlocked positions by rotating the locking member 36 around the axis of the first positioning shaft 371, making the operation very simple and convenient. In other embodiments, the two ends of the locking member are respectively configured to be detachably connected to the first positioning shaft and the second positioning shaft. Thus, in the unfolded state, the operator can position the two ends of the locking member between the first lower rod 31 and the intermediate connecting member 35 by positioning them with the first and second positioning shafts respectively. In the folded state, the operator can separate the two ends of the locking member from the first and second positioning shafts respectively, allowing the first parallelogram deformable structure to deform.

[0038] In some specific embodiments, the first positioning shaft 371 protrudes from the outer side of the base frame 3, and the first positioning member 37 further includes a first limiting head 372 connected to the outer end of the first positioning shaft 371. The first limiting head 372 protrudes from the outer periphery of the first positioning shaft 371. The connecting part 361 is provided with a positioning hole 3611, and the locking member 36 is sleeved on the outside of the first positioning shaft 371 through the positioning hole 3611 and rotatably connected to the first positioning shaft 371. After connection, the connecting part 361 is axially limited between the outer side of the base frame 3 and the first limiting head 372 to prevent the locking member 36 from disengaging from the first lower rod 31. In this embodiment, the first positioning member 37 is set as a rivet, which has a simple structure and stable connection. In other embodiments, the first positioning member 37 can also be set as a bolt or other connection structure that can realize the rotatable connection between the first lower rod 31 and the connecting part 361.

[0039] In some specific embodiments, the second positioning shaft 381 protrudes from the outer side of the base frame 3. The second positioning member 38 further includes a second limiting head 382 connected to the outer end of the second positioning shaft 381. The second limiting head 382 protrudes from the outer periphery of the second positioning shaft 381. The hook portion 362 has a notch 3621 arranged on its side. The locking member 36 extends into the notch 3621 through the second positioning shaft 381 and hooks with the second positioning shaft 381. After connection, the hook portion 362 is axially limited between the outer side of the base frame 3 and the second limiting head 382, ​​preventing the locking member 36 from disengaging from the intermediate connecting member 35. In this embodiment, the second positioning member 38 is set as a rivet, which has a simple structure and stable connection. In other embodiments, the second positioning member 38 can also be set as a bolt or other connection structure that can realize the hook connection between the intermediate connecting member 35 and the hook portion 362.

[0040] like Figure 3 As shown, in some specific embodiments, the locking member 36 further includes an operating part 363 protruding from the outside of the hook portion 362. The operating part 363 is used by the operator to operate the locking member 36 to rotate around the first positioning axis 371, making it convenient for the operator to hold. The operating part 363 is arranged on the side of the hook portion 362 away from the notch 3621, resulting in a compact structure and cost savings. Furthermore, its location away from the positioning hole 3611, based on the lever principle, facilitates easy operation by the operator to rotate the locking member 36 around the axis of the first positioning axis 371. In other embodiments, the operating part 361 can also be connected to the connecting part 361, or simultaneously connected to both the hook portion 362 and the connecting part 361, all of which facilitate the operator's grip on the material locking member 36 to rotate around the first positioning axis 371.

[0041] like Figure 2As shown, in some specific embodiments, a third positioning member 39 is also provided on the second upper rod 34. The third positioning member 39 includes a third positioning shaft 391, and the connecting part 361 of the locking member 36 is rotatably connected to the first positioning shaft 371. When the folding cart is in the unfolded state, the hook part 362 can hook and connect with the second positioning shaft 381 to prevent the first parallelogram deformable structure and the second parallelogram deformable structure from deforming, thereby locking the folding cart in the unfolded state; and when the folding cart is in the folded state, the hook part 362 can hook and connect with the third positioning shaft 391 to prevent the first parallelogram deformable structure and the second parallelogram deformable structure from deforming, thereby locking the folding cart in the folded state, facilitating stable storage of the folding cart. In other embodiments, the third positioning member can also be provided on the second lower rod 33, or the first positioning member 37 can also be provided on the first upper rod 32, both of which can lock the folding cart in the folded state.

[0042] In some specific embodiments, the third positioning shaft 391 protrudes from the outer side of the base frame 3. The third positioning member 39 also includes a third limiting head 392 connected to the outer end of the third positioning shaft 391. The third limiting head 392 protrudes from the outer periphery of the third positioning shaft 391. The locking member 36 extends into the notch 3621 through the third positioning shaft 391 and hooks onto the third positioning shaft 391. After connection, the hook portion 362 is axially limited between the outer side of the base frame 3 and the third limiting head 392, preventing the locking member 36 from disengaging from the second upper rod 34. In this embodiment, the third positioning member 39 is set as a rivet, which has a simple structure and stable connection. In other embodiments, the third positioning member 39 can also be set as a bolt or other connection structure that can achieve hook connection between the second upper rod 34 and the hook portion 362.

[0043] like Figure 2 As shown, in some specific embodiments, the two ends of the first lower rod 31 and the first upper rod 32 are respectively hinged to the first connecting member 4 and the intermediate connecting member 35 via hinge shafts. The two ends of the second lower rod 33 and the second upper rod 34 are respectively hinged to the second connecting member 5 and the intermediate connecting member 35 via hinge shafts. Optionally, each hinge shaft is set as a rivet, resulting in a simple structure and a stable connection. The second positioning shaft 381 is set as a partial structure of the hinge shaft of a hinge shaft on the intermediate connecting member 35, simplifying the structure and allowing the second positioning member 38 and the hinge shaft on the intermediate connecting member 35 to be set as the same rivet, achieving a multi-purpose effect. In other embodiments, the second positioning shaft 381 can also be set as an independent structure relative to the hinge shaft, or the first positioning member 37 can be set as a partial structure of the hinge shaft of a hinge shaft on the intermediate connecting member 35, while the second positioning member 38 is set on the first lower rod 31.

[0044] like Figure 1As shown, in some specific embodiments, when the folding vehicle is in the unfolded state, the first lower rod 31 is limited to the upper side of the first connecting member 4, the first upper rod 32 is limited to the lower side of the intermediate connecting member 35, the second lower rod 33 is limited to the upper side of the second connecting member 5, and the second upper rod 32 is limited to the lower side of the intermediate connecting member 35, thereby keeping the first parallelogram deformable structure and the second parallelogram deformable structure in the unfolded state and locking them by the locking member 36.

[0045] In some specific embodiments, two sets of the first lower rod 31, first upper rod 32, second lower rod 33, second upper rod 34, intermediate connector 35, and locking member 35 are correspondingly provided. The base frame 3 also includes a support rod assembly 30, which is connected between the two sets of first upper rods 32 and the two sets of second upper rods 34. It can synchronously unfold or fold the two sets of first lower rods 31, first upper rods 32, second lower rods 33, second upper rods 34, intermediate connector 35, and locking member 35, and is used to carry items inside the folding cart. In other embodiments, the support rod assembly 30 can also be connected between the two sets of first lower rods 31 and the two sets of second lower rods 33, or between two sets of structures, including any one or more combinations of the first lower rods 31, first upper rods 32, second lower rods 33, and second upper rods 34.

[0046] like Figure 1 As shown, in some specific embodiments, it also includes a wheel assembly connected to the first side frame 1 and the second side frame 2, and a handle assembly for the operator to push and pull the folding cart.

[0047] like Figure 5 As shown, as a second embodiment of this utility model, a structurally stable simple folding cart is also provided. The main difference between the second embodiment and the first embodiment is that the first positioning member 37 is disposed on the intermediate connecting member 35, and the second positioning member 38 is disposed on the first lower rod 31. This embodiment can also lock the folding cart in the unfolded state by supporting the two ends of the locking member 36 on the first parallelogram deformable structure to prevent the first parallelogram deformable structure from deforming.

[0048] like Figure 6 As shown, as a third embodiment of this utility model, a structurally stable simple folding cart is also provided. The main difference between the third embodiment and the first embodiment is that the first positioning member 37 is disposed on the first lower rod 31, and the second positioning member 38 is disposed on the first upper rod 32. This embodiment can also lock the folding cart in the unfolded state by supporting the two ends of the locking member 36 on the first parallelogram deformable structure to prevent the first parallelogram deformable structure from deforming.

[0049] like Figure 7As shown, as a fourth embodiment of this utility model, a structurally stable simple folding cart is also provided. The main difference between the fourth embodiment and the first embodiment is that the first positioning member 37 is disposed on the first lower rod 31, and the second positioning member 38 is disposed on the first connecting member 4. This embodiment can also lock the folding cart in the unfolded state by supporting the two ends of the locking member 36 on the first parallelogram deformable structure to prevent the first parallelogram deformable structure from deforming.

[0050] like Figure 8 As shown, as the fifth embodiment of this utility model, a structurally stable simple folding cart is also provided. The main difference between the fifth embodiment and the first embodiment is that the first positioning member 37 is disposed on the first connecting member 4, and the second positioning member 38 is disposed on the first upper rod 32. This embodiment can also lock the folding cart in the unfolded state by supporting the two ends of the locking member 36 on the first parallelogram deformable structure to prevent the first parallelogram deformable structure from deforming.

[0051] like Figure 9 As shown, as the sixth embodiment of this utility model, a structurally stable simple folding cart is also provided. The main difference between the sixth embodiment and the first embodiment is that multiple locking members 36 are provided. A first positioning member 37, which cooperates with one of the locking members 36, is located on the first lower rod 31, and a second positioning member 38 is located on the intermediate connecting member 35. A first positioning member 37, which cooperates with another locking member 36, is located on the first lower rod 31, and a second positioning member 38 is located on the first upper rod 32. A first positioning member 37, which cooperates with another locking member 36, is located on the first lower rod 31, and a second positioning member 38 is located on the first connecting member 4. A first positioning member 37, which cooperates with another locking member 36, is located on the second lower rod 33, and a second positioning member 38 is located on the second upper rod 34. A first positioning member 37, which cooperates with another locking member 36, is located on the second lower rod 33, and a second positioning member 38 is located on the second connecting member 5, thereby increasing the stability of the folding cart in the unfolded state. Figure 10As shown, in the seventh embodiment of this utility model, the first positioning member 37, which is connected to one of the locking members 36, can be placed on the intermediate connecting member 35 and the second positioning member 38 can be placed on the first lower rod 31. The first positioning member 37, which is connected to the other locking member 36, can be placed on the first connecting member 4 and the second positioning member 38 can be placed on the first upper rod 32. The first positioning member 37, which is connected to the other locking member 36, can be placed on the intermediate connecting member 35 and the second positioning member 38 can be placed on the second lower rod 33. Alternatively, the first positioning member 37, which is connected to the other locking member 36, can be placed on the second connecting member 5 and the second positioning member 38 can be placed on the second upper rod 34. This can also increase the stability of the folding vehicle locking in the unfolded state.

[0052] In other embodiments, the first positioning member 37 and the second positioning member 38, which cooperate with the locking member 36, can also be arranged at other positions on the first parallelogram deformable structure. The first positioning member 37 is disposed on one of the first lower rod 31, the first upper rod 32, the first connecting member 4, and the intermediate connecting member 35, and the second positioning member 38 is disposed on the other of the first lower rod 31, the first upper rod 32, the first connecting member 4, and the intermediate connecting member 35. The first positioning member 37 and the second positioning member 38 are arranged along a first straight line, and the first straight line is arranged at an angle to each side of the first parallelogram deformable structure. These embodiments enable the locking member 36 to support the first parallelogram deformable structure along the first straight line, thereby preventing the locking member 36 from moving with the deformation of the first parallelogram deformable structure, improving the stability of the locking member 36 in preventing the deformation of the first parallelogram deformable structure, and thus improving the stability of the folding vehicle lock in the unfolded state.

[0053] In other embodiments, the first positioning member 37 and the second positioning member 38, which cooperate with the locking member 36, can also be arranged at other positions on the second parallelogram deformable structure. The first positioning member 37 is disposed on one of the second lower rod 33, the second upper rod 34, the second connecting member 5, and the intermediate connecting member 35, and the second positioning member 38 is disposed on the other of the second lower rod 33, the second upper rod 34, the second connecting member 5, and the intermediate connecting member 35. The first positioning member 37 and the second positioning member 38 are arranged along a second straight line, and the second straight line is arranged at an angle to each side of the second parallelogram deformable structure. These embodiments enable the locking member 36 to support the second parallelogram deformable structure along the second straight line, thereby preventing the locking member 36 from moving with the deformation of the second parallelogram deformable structure, improving the stability of the locking member 36 in preventing the deformation of the second parallelogram deformable structure, and thus improving the stability of the folding vehicle lock in the unfolded state.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

[0055] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the patent of the present utility model.

Claims

1. A structurally stable simple folding vehicle, having an unfolded state and a folded state, characterized in that: It includes a first side frame, a second side frame, and a base frame. The lower part of the first side frame is provided with a first connecting member, and the lower part of the second side frame is provided with a second connecting member. The base frame includes a first lower rod, a first upper rod, a second lower rod, a second upper rod, an intermediate connector, and at least one locking member. The two ends of the first lower rod and the first upper rod are respectively hinged to the first connector and the intermediate connector, and together with the first connector and the intermediate connector, they form a first parallelogram deformable structure. The two ends of the second lower rod and the second upper rod are respectively hinged to the second connector and the intermediate connector, and together with the second connector and the intermediate connector, they form a second parallelogram deformable structure. In the unfolded state, the two ends of the locking member can be supported on the first parallelogram deformable structure and / or the second parallelogram deformable structure respectively, so as to prevent the first parallelogram deformable structure and the second parallelogram deformable structure from deforming.

2. The simple folding vehicle according to claim 1, characterized in that: One of the first lower rod, the first upper rod, the first connecting member, and the intermediate connecting member is provided with a first positioning member, and the other of the first lower rod, the first upper rod, the first connecting member, and the intermediate connecting member is provided with a second positioning member. The first positioning member and the second positioning member are arranged along a first straight line, and the first straight line is arranged at an angle to each side of the first parallelogram deformed structure. In the unfolded state, one end of the locking member is positioned and connected to the first positioning member, and the other end is positioned and connected to the second positioning member.

3. The simple folding vehicle according to claim 1, characterized in that: One of the second lower rod, the second upper rod, the second connecting member, and the intermediate connecting member is provided with a first positioning member, and the other of the second lower rod, the second upper rod, the second connecting member, and the intermediate connecting member is provided with a second positioning member. The first positioning member and the second positioning member are arranged along a second straight line, and the second straight line is arranged at an angle to each side of the second parallelogram deformed structure. In the unfolded state, one end of the locking member is positioned and connected to the first positioning member, and the other end is positioned and connected to the second positioning member.

4. The simple folding vehicle according to claim 2 or 3, characterized in that: The first positioning member includes a first positioning shaft, the second positioning member includes a second positioning shaft, and the locking member includes a connecting part disposed at one end and a hook part disposed at the other end. The connecting part is rotatably connected to the first positioning shaft, and the locking member can rotate around the axis of the first positioning shaft between a locked position and an unlocked position. In the locked position, the hook part is hooked and connected to the second positioning shaft, and in the unlocked position, the hook part is separated from the second positioning shaft.

5. The simple folding vehicle according to claim 4, characterized in that: The first positioning shaft protrudes from the outside of the base frame. The first positioning component also includes a first limiting head connected to the outer end of the first positioning shaft. The first limiting head protrudes from the outer periphery of the first positioning shaft. The connecting part is provided with a positioning hole. The locking component is sleeved on the outside of the first positioning shaft through the positioning hole and rotatably connected to the first positioning shaft. After connection, the connecting part is axially limited between the outside of the base frame and the first limiting head.

6. The simple folding vehicle according to claim 5, characterized in that: The second positioning shaft protrudes from the outside of the base frame. The second positioning member also includes a second limiting head connected to the outer end of the second positioning shaft. The second limiting head protrudes from the outer periphery of the second positioning shaft. The hook portion has a notch arranged on its side. The locking member extends into the notch through the second positioning shaft and hooks and connects with the second positioning shaft. After connection, the hook portion is axially limited between the outside of the base frame and the second limiting head.

7. The simple folding vehicle according to claim 4, characterized in that: The locking member also includes an operating part protruding from the outside of the connecting part and / or the hook part, the operating part being used by the operator to rotate the locking member around the first positioning axis.

8. The simple folding vehicle according to claim 4, characterized in that: It also includes a third positioning component disposed on the second lower rod or the second upper rod, the third positioning component including a third positioning shaft; At least one of the locking members is rotatably connected to a first positioning shaft provided on a first lower rod or a first upper rod. In the unfolded state, the hook part can be hooked to a second positioning shaft, and in the folded state, the hook part can be hooked to a third positioning shaft to prevent the first parallelogram deformable structure and the second parallelogram deformable structure from deforming.

9. The simple folding vehicle according to claim 4, characterized in that: The two ends of the first lower rod and the first upper rod are respectively hinged to the first connecting member and the intermediate connecting member via hinge shafts. The two ends of the second lower rod and the second upper rod are respectively hinged to the second connecting member and the intermediate connecting member via hinge shafts. The first positioning shaft is set as a part of the hinge shaft structure, and / or the second positioning shaft is set as a part of the hinge shaft structure.

10. The simple folding vehicle according to any one of claims 1-3, characterized in that: The first lower rod, the first upper rod, the second lower rod, the second upper rod, the intermediate connecting piece, and at least one locking piece are provided in two sets. The base frame also includes a support rod group, which is connected between the two sets of first upper rods and / or between the two sets of second upper rods and / or between the first lower rods and / or between the two sets of second lower rods.

Images