Folding cart
The folding stroller design with symmetrical foldable components and a locking mechanism simplifies the conversion process and prevents detachment, addressing the operational complexity and maintenance issues of existing models.
Patent Information
- Application Number
- CN202422257218.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-13
AI Technical Summary
Due to the lack of linkage between the various components, existing folding carts need to be operated one by one when using them. The steps are cumbersome, time-consuming, and easy to loosen, and require frequent maintenance.
A folding cart is designed, and the foldable bottom frame is connected by the first and second fixed frames, and the linkage of the folding components is achieved through the limit connection device and the locking device, simplifying the operation process.
It realizes simple operation and quick change of folding state, reduces the risk of loose parts, improves the convenience of use and maintenance.
Smart Images
Figure CN223100757U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of machinery, in particular to a folding trolley. Background Art
[0002] A folding trolley refers to a trolley that reduces its own volume by folding. The folding trolley is convenient for people to transport items. At the same time, because it can be folded, it also has the advantages of being convenient to carry and store. However, in the existing folding trolley, there is no linkage relationship between its components. When in use, it is necessary to change each component from the folded state to the use state one by one, which has many steps, is cumbersome to operate, takes a long time, and the components are also prone to looseness and need to be maintained frequently. Content of the Utility Model
[0003] In order to solve the above problems, the utility model provides a folding trolley, which includes:
[0004] A frame main body, which includes a first fixed frame and a second fixed frame. The first fixed frame and the second fixed frame are arranged opposite to each other, and rollers are provided at the bottoms of the first fixed frame and the second fixed frame.
[0005] A collapsible chassis, which includes a first folding component and a second folding component. The first folding component is pivotally connected to the first fixed frame, and the second folding component is pivotally connected to the second fixed frame. The first folding component and the second folding component are hinged to each other through a limit connection device and locked by a locking device. The first folding component and the second folding component are symmetrically arranged relative to the limit connection device.
[0006] Preferably, the first folding component includes a first rectangular frame body and a first support member. At least two first support members are provided and are all located below the first rectangular frame body. The two first support members are parallel to the two side frames of the first rectangular frame body. One side of the first rectangular frame body is pivotally connected to the first fixed frame, and one end of the first support member is also pivotally connected to the first fixed frame. The side of the first rectangular frame body far from the first fixed frame is hinged to the limit connection device, and the end of the first support member far from the first fixed frame is also hinged to the limit connection device.
[0007] Preferably, the second folding component includes a second rectangular frame body and a second support member. At least two second support members are provided and are all located below the second rectangular frame body. The two second support members are parallel to the two side frames of the second rectangular frame body. One side of the second rectangular frame body is pivotally connected to the second fixed frame, and one end of the second support member is also pivotally connected to the second fixed frame. The side of the second rectangular frame body far from the second fixed frame is hinged to the limit connection device, and the end of the second support member far from the second fixed frame is also hinged to the limit connection device.
[0008] Preferably, the limit connection device includes a first limit connecting member and a second limit connecting member. The first limit connecting member and the second limit connecting member have the same structure and are arranged oppositely. Both the first limit connecting member and the second limit connecting member include two side plates and a top plate. The two side plates and the top plate are integrally formed into a U-shaped structure. The opposite ends of the first folding assembly and the second folding assembly are both arranged between the two side plates and are hinged to the two side plates.
[0009] Preferably, the opposite ends of the first folding assembly and the second folding assembly are hinged to the two side plates through anti-loosening bolts. Pin holes are provided on the opposite ends of the first folding assembly and the second folding assembly and on the side plates. The anti-loosening bolts pass through the pin holes to achieve the hinge connection. The anti-loosening bolt includes a bolt head, a bolt rod, and a reinforcing column that are integrally formed. The bolt rod portion includes a threaded section one and a threaded section two that are connected to each other. The threaded section one is fixed to the bolt head. The reinforcing column is fixed at the tail of the threaded section two. The thread pitch in the threaded section one is the same as the thread pitch in the threaded section two. The thread height of the threaded section two gradually decreases from the head to the tail. The length of the threaded section one is 2 to 4 times the thread pitch. The length of the threaded section two is 6 to 10 times the thread pitch. An internal tapping groove for machining an internal thread in the mounting hole is formed between the threaded section two and the reinforcing column. The diameter of the internal tapping groove is smaller than the diameter of the reinforcing column.
[0010] Preferably, a first groove is provided in the middle position of the upper half of the first limit connecting member, and a second groove is provided in the middle position of the upper half of the second limit connecting member. The locking device includes a first locking member and a second locking member. The first locking member is arranged on the first groove and is fixedly connected to the first limit connecting member. The second locking member is arranged on the second groove and is fixedly connected to the second limit connecting member.
[0011] Preferably, the upper half of the first limit connecting member is hinged to a first rectangular frame body and a second rectangular frame body on both sides of the first locking member respectively. The two sides of the lower half of the first limit connecting member are hinged to a first support member and a second support member respectively. The upper half of the second limit connecting member is hinged to the first rectangular frame body and the second rectangular frame body on both sides of the second locking member respectively. The two sides of the lower half of the second limit connecting member are hinged to the first support member and the second support member respectively.
[0012] Preferably, the first fixed frame includes two first vertical pipes and two first horizontal pipes. The two first vertical pipes are respectively fixed at both ends of the two first horizontal pipes. Rollers are fixedly connected to the bottoms of the two first vertical pipes. The second fixed frame includes two second vertical pipes and two second horizontal pipes. The two second vertical pipes are respectively fixed at both ends of the two second horizontal pipes. Rollers are fixedly connected to the bottoms of the two second vertical pipes.
[0013] Preferably, the first locking member and the second locking member have the same structure. The first locking member includes a first rotatable handle and a first fixing plate. The first fixing plate is fixed on the first limiting connecting member. The first rotatable handle passes through the first fixing plate and locks in the first groove. The second locking member includes a second rotatable handle and a second fixing plate. The second fixing plate is fixed on the second limiting connecting member. The second rotatable handle passes through the first fixing plate and locks in the second groove.
[0014] The beneficial effects are as follows: When using the existing folding cart, it is necessary to change the components from the folded state to the use state one by one, which has many steps, is cumbersome to operate, and takes a long time. However, the design structure of this product is simple. Only by opening the locking device, other components can be changed from the folded state to the use state. The operation is convenient and it is not easy to become loose. Specifically, when in use, by pressing, the first folding component and the second folding component move downward and cross the dead point where the first limiting connecting member and the second limiting connecting member are arranged in a straight line, the locking device maintains the open locking state. When the first folding component and the second folding component move upward and cross the dead point, the locking device is unlocked and maintains the open locking state, and the folding cart can be folded up for storage and transportation. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:
[0016] Figure 1 It is a schematic structural diagram of the present utility model in the open state;
[0017] Figure 2 It is a schematic structural diagram of the present utility model in the folded state;
[0018] 1. Frame body;
[0019] 11. First fixed frame; 111. First vertical pipe; 112. First horizontal pipe;
[0020] 12. Second fixed frame; 121. Second vertical pipe; 122. Second horizontal pipe;
[0021] 13. Foldable bottom frame; 131. First folding component; 1311. First rectangular frame; 1312. First support member; 132. Second folding component; 1321. Second rectangular frame; 1322. Second support member;
[0022] 14. Limiting connection device; 141. First limiting connecting member; 142. Second limiting connecting member;
[0023] 15. Locking device; 151. First locking member; 152. Second locking member;
[0024] 2. Roller Specific Embodiment
[0025] The following will disclose multiple embodiments of the present utility model with diagrams. For the sake of clear illustration, many practical details will be described together in the following narrative. However, it should be understood that these practical details are not used to limit the present utility model. That is to say, in some embodiments of the present utility model, these practical details are not necessary. In addition, for the purpose of simplifying the diagrams, some conventional structures and components will be shown in a simple schematic manner in the diagrams.
[0026] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture as shown in the drawings. If this specific posture changes, then the directional indications will also change accordingly.
[0027] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes, not specifically referring to the order or sequence, nor used to limit the present utility model. It is only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0028] Embodiment
[0029] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of the present utility model in the open state, Figure 2 is a schematic structural diagram of the present utility model in the folded state. This embodiment provides a folding cart including a frame body 1 and at least 4 rollers 2. The 4 rollers 2 are fixed at the bottom of the frame body 1 to facilitate the movement of the folding cart. The rollers 2 are preferably universal wheels, which are beneficial for the folding cart to turn flexibly.
[0030] The frame body 1 includes a first fixed frame 11, a second fixed frame 12 and a foldable chassis 13. The first fixed frame 11 and the second fixed frame 12 are oppositely arranged at both ends of the foldable chassis 13. Two rollers 2 are arranged at the bottom of the first fixed frame 11, and two rollers 2 are arranged at the bottom of the second fixed frame 12. Specifically, the first fixed frame 11 includes two first vertical tubes 111 and two first horizontal tubes 112. The two first vertical tubes 111 are respectively fixed at both ends of the two first horizontal tubes 112. Two rollers are respectively fixed at the bottoms of the two first vertical tubes 111. The second fixed frame 12 includes two second vertical tubes 121 and two second horizontal tubes 122. The two second vertical tubes 121 are respectively fixed at both ends of the two second horizontal tubes 122. Two rollers 2 are respectively fixed at the bottoms of the two second vertical tubes 121. The foldable chassis 13 includes a first folding assembly 131 and a second folding assembly 132. The first folding assembly 131 is pivotally connected to the first fixed frame 11, and the second folding assembly 132 is pivotally connected to the second fixed frame 12. The first folding assembly 131 and the second folding assembly 132 are hinged to each other by a limit connection device 14 and locked by a locking device 15. The first folding assembly 131 and the second folding assembly 132 are symmetrically arranged with respect to the limit connection device 14.
[0031] The above-mentioned frame body 1 has a simple structure. Only by opening the locking device 15 can other components be changed from the folded state to the use state, which is convenient to operate. Specifically, when in use, by pressing, the first folding assembly 131 and the second folding assembly 132 move downward and cross the dead point where the limit connection device 14 is arranged in a straight line, the locking device 15 maintains the open locking state. When the first folding assembly 131 and the second folding assembly 132 move upward and cross the dead point, the locking device 15 is released to maintain the open locking state, and the folding cart can be folded up for storage and transportation.
[0032] Refer back to Figure 1, the first folding component 131 includes a first rectangular frame 1311 and a first support member 1312. There are at least two first support members 1312, and they are all located below the first rectangular frame 1311. The two first support members 1312 are parallel to the two side frames of the first rectangular frame 1311. One side of the first rectangular frame 1311 is pivotally connected to the first fixed frame 11, and one end of the first support member 1312 is also pivotally connected to the first fixed frame 11. The side of the first rectangular frame 1311 away from the first fixed frame 11 is hinged to the limit connection device 14, and one end of the first support member 1312 away from the first fixed frame 11 is also hinged to the limit connection device 14. The second folding component 132 includes a second rectangular frame 1321 and a second support member 1322. There are at least two second support members 1322, and they are all located below the second rectangular frame 1321. The two second support members 1322 are parallel to the two side frames of the second rectangular frame 1321. One side of the second rectangular frame 1321 is pivotally connected to the second fixed frame 12, and one end of the second support member 1322 is also pivotally connected to the second fixed frame 12. The side of the second rectangular frame 1321 away from the second fixed frame 12 is hinged to the limit connection device 14, and one end of the second support member 1322 away from the second fixed frame 12 is also hinged to the limit connection device 14. The first support member 1312 and the second support member 1322 are both made of pipes with a square cross-section.
[0033] The limit connection device 14 includes a first limit connection member 141 and a second limit connection member 142. The first limit connection member 141 and the second limit connection member 142 have the same structure and are arranged oppositely. There is a first groove in the middle of the upper half of the first limit connection member 141, and there is a second groove in the middle of the upper half of the second limit connection member 142. The locking device 15 includes a first locking member 151 and a second locking member 152. The first locking member 151 and the second locking member 152 have the same structure. The first locking member 151 is arranged in the first groove and is fixedly connected to the first limit connection member 141, and the second locking member 152 is arranged in the second groove and is fixedly connected to the second limit connection member 142. Specifically, the upper half of the first limit connection member 141 is hinged to the first rectangular frame 1311 and the second rectangular frame 1321 respectively on both sides of the first locking member 151, and the lower half of the first limit connection member 141 is hinged to the first support member 1312 and the second support member 1322 respectively on both sides. The upper half of the second limit connection member 142 is hinged to the first rectangular frame 1311 and the second rectangular frame 1321 respectively on both sides of the second locking member 152, and the lower half of the second limit connection member 142 is hinged to the first support member 1312 and the second support member 1322 respectively on both sides.
[0034] Among them, the first locking member 151 includes a first rotatable handle and a first fixing plate. The first fixing plate is fixed on the first limiting connecting member 141. The first rotatable handle passes through the first fixing plate and is locked in the first groove. The second locking member 152 includes a second rotatable handle and a second fixing plate. The second fixing plate is fixed on the second limiting connecting member 142. The second rotatable handle passes through the first fixing plate and is locked in the second groove.
[0035] The first limiting connecting member 141 and the second limiting connecting member 142 have the same structure, and both include two side plates and a top plate. The two side plates and the top plate are integrally formed into a U-shaped. The opposite ends of the first folding assembly 131 and the second folding assembly 132 are both arranged between the two side plates and are hinged to the two side plates. Pin holes are formed in the opposite ends of the first folding assembly 131 and the second folding assembly 132 and on the side plates. The anti-loosening bolts pass through the pin holes to achieve the hinge connection. Specifically, the opposite ends of the first rectangular frame body 1311 and the second rectangular frame body 1321 are hinged to the upper half of the two side plates through anti-loosening bolts, and the opposite ends of the first support member 1312 and the second support member 1322 are hinged to the lower half of the two side plates through anti-loosening bolts.
[0036] The anti-loosening bolt includes a bolt head, a bolt rod and a reinforcing column which are integrally formed. The bolt rod part includes a threaded section one and a threaded section two which are connected to each other. The threaded section one is fixed to the bolt head. The reinforcing column is fixed at the tail of the threaded section two. The reinforcing column can play a guiding role. The thread pitch in the threaded section one is the same as the thread pitch in the threaded section two. The thread height of the threaded section two gradually decreases from the head to the tail. The length of the threaded section one is 2 to 4 times the thread pitch, and the length of the threaded section two is 6 to 10 times the thread pitch. The lengths of the threaded section one and the threaded section two set within this range can not only prevent the frame body 1 from being too thick and wasting materials, but also prevent the frame body 1 from being too thin and resulting in too small bearing capacity and being easily broken. An internal tapping groove for machining an internal thread in the installation hole is formed between the threaded section two and the reinforcing column. The diameter of the internal tapping groove is smaller than the diameter of the reinforcing column, and the diameter of the reinforcing column is slightly smaller than the diameter of the installation hole. In this way, it is convenient for quick installation. When the bolt loosens during service and rotates outwards, the reinforcing column will contact the internal thread in the installation hole, making the bolt unable to rotate out smoothly, and firmly clamping the bolt in the installation hole to achieve the anti-loosening effect. The total length of the bolt rod can be determined according to the cross-sectional side length of the first support member 1312 and the second support member 1322. The frame body 1 can be made of metal materials such as copper, iron, aluminum, stainless steel, etc. Its surface can be coated with an anti-corrosion coating or wrapped with materials such as silica gel and sponge to extend the service life of the frame body 1.
[0037] In summary, the design of this product is simple. Only by opening the first locking member 151 and the second locking member 152 respectively can all other components be changed from the folded state to the use state. The operation is convenient and it is not easy to become loose. Specifically, when in use, by pressing, the first folding component 131 and the second folding component 132 move downward and cross the dead point where the first limiting connecting member 141 and the second limiting connecting member 142 are arranged in a straight line, the first locking member 151 and the second locking member 152 both maintain the open locking state. And when the first folding component 131 and the second folding component 132 move upward and cross the dead point, the open locking state maintained by the first locking member 151 and the second locking member 152 is released, and the folding cart can be folded up for storage and transportation.
[0038] The above are only the embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the scope of the claims of the present utility model.
Claims
1. A folding trolley, characterized in that, Comprising: A frame main body (1), which includes a first fixed frame (11) and a second fixed frame (12). The first fixed frame (11) and the second fixed frame (12) are arranged opposite to each other, and rollers (2) are provided at the bottoms of both the first fixed frame (11) and the second fixed frame (12). A collapsible chassis (13), which includes a first folding assembly (131) and a second folding assembly (132). The first folding assembly (131) is pivotally connected to the first fixed frame (11), and the second folding assembly (132) is pivotally connected to the second fixed frame (12). The first folding assembly (131) and the second folding assembly (132) are hinged to each other by a limit connection device (14) and locked by a locking device (15). The first folding assembly (131) and the second folding assembly (132) are symmetrically arranged with respect to the limit connection device (14).
2. The folding trolley according to claim 1, wherein The first folding assembly (131) includes a first rectangular frame body (1311) and a first support member (1312). At least two first support members (1312) are provided and are all located below the first rectangular frame body (1311). The two first support members (1312) are parallel to the two side frames of the first rectangular frame body (1311). One side of the first rectangular frame body (1311) is pivotally connected to the first fixed frame (11), and one end of the first support member (1312) is also pivotally connected to the first fixed frame (11). The side of the first rectangular frame body (1311) away from the first fixed frame (11) is hinged to the limit connection device (14), and one end of the first support member (1312) away from the first fixed frame (11) is also hinged to the limit connection device (14).
3. The folding cart according to claim 2, wherein, The second folding assembly (132) includes a second rectangular frame body (1321) and a second support member (1322). At least two second support members (1322) are provided and are all located below the second rectangular frame body (1321). The two second support members (1322) are parallel to the two side frames of the second rectangular frame body (1321). One side of the second rectangular frame body (1321) is pivotally connected to the second fixed frame (12), and one end of the second support member (1322) is also pivotally connected to the second fixed frame (12). The side of the second rectangular frame body (1321) away from the second fixed frame (12) is hinged to the limit connection device (14), and one end of the second support member (1322) away from the second fixed frame (12) is also hinged to the limit connection device (14).
4. The folding cart according to claim 3, wherein, The limiting connection device (14) includes a first limiting connecting member (141) and a second limiting connecting member (142). The first limiting connecting member (141) and the second limiting connecting member (142) have the same structure and are arranged oppositely. Both the first limiting connecting member (141) and the second limiting connecting member (142) include two side plates and a top plate. The two side plates and the top plate are integrally formed into a U-shaped structure. The opposite ends of the first folding assembly (131) and the second folding assembly (132) are arranged between the two side plates and are hinged to the two side plates.
5. The folding trolley according to claim 4, characterized in that, The opposite ends of the first folding assembly (131) and the second folding assembly (132) are hinged to the two side plates through anti-loosening bolts. Pin holes are formed in the opposite ends of the first folding assembly (131) and the second folding assembly (132) and on the side plates. The anti-loosening bolts pass through the pin holes to achieve the hinge connection. The anti-loosening bolt includes an integrally formed bolt head, a bolt rod, and a reinforcing column. The bolt rod portion includes a threaded section one and a threaded section two that are connected to each other. The threaded section one is fixed to the bolt head. The reinforcing column is fixed at the tail of the threaded section two. The thread pitch in the threaded section one is the same as the thread pitch in the threaded section two. The thread height of the threaded section two gradually decreases from the head to the tail. The length of the threaded section one is 2 to 4 times the thread pitch. The length of the threaded section two is 6 to 10 times the thread pitch. An internal tapping groove for machining an internal thread in the installation hole is formed between the threaded section two and the reinforcing column. The diameter of the internal tapping groove is smaller than the diameter of the reinforcing column.
6. The folding cart according to claim 5, characterized in that, A first groove is provided at the middle position of the upper half of the first limiting connecting member (141), and a second groove is provided at the middle position of the upper half of the second limiting connecting member (142). The locking device (15) includes a first locking member (151) and a second locking member (152). The first locking member (151) is arranged on the first groove and is fixedly connected to the first limiting connecting member (141). The second locking member (152) is arranged on the second groove and is fixedly connected to the second limiting connecting member (142).
7. The folding cart according to claim 6, wherein The upper half of the first limiting connecting member (141) is hinged to the first rectangular frame body (1311) and the second rectangular frame body (1321) on both sides of the first locking member (151) respectively. The lower half of the first limiting connecting member (141) is hinged to the first support member (1312) and the second support member (1322) on both sides respectively. The upper half of the second limiting connecting member (142) is hinged to the first rectangular frame body (1311) and the second rectangular frame body (1321) on both sides of the second locking member (152) respectively. The lower half of the second limiting connecting member (142) is hinged to the first support member (1312) and the second support member (1322) on both sides respectively.
8. The folding cart according to claim 7, wherein The first fixed frame (11) includes two first vertical pipes (111) and two first horizontal pipes (112). The two first vertical pipes (111) are respectively fixed at both ends of the two first horizontal pipes (112). The bottom of the two first vertical pipes (111) is fixedly connected with the rollers (2). The second fixed frame (12) includes two second vertical pipes (121) and two second horizontal pipes (122). The two second vertical pipes (121) are respectively fixed at both ends of the two second horizontal pipes (122). The bottom of the two second vertical pipes (121) is fixedly connected with the rollers (2).
9. The folding cart according to claim 8, wherein The first locking member (151) and the second locking member (152) have the same structure. The first locking member (151) includes a first rotatable handle and a first fixing plate. The first fixing plate is fixed on the first limiting connecting member (141). The first rotatable handle passes through the first fixing plate and is locked in the first groove. The second locking member (152) includes a second rotatable handle and a second fixing plate. The second fixing plate is fixed on the second limiting connecting member (142). The second rotatable handle passes through the first fixing plate and is locked in the second groove.