Connecting structure and trolley

Abstract

The utility model provides a connecting structure and a handcart, which comprises an outer pipe and an inner pipe, and the outer pipe is sleeved on the inner pipe; each sliding assembly comprises a rolling wheel, the rolling wheels are rotatably arranged relative to the inner pipe, the rolling wheels are located in the inner pipe, and the two rolling wheels are oppositely arranged; the inner pipe is provided with at least two through grooves penetrating through the pipe wall of the inner pipe, the through grooves are used for the rollers to pass through in a rolling mode, the rollers abut against the outer pipe through the through grooves, and the through grooves correspond to the rollers. And the inner pipe is pushed and pulled to drive the roller to move on the inner wall of the outer pipe through the through groove, so that the inner pipe is telescopically arranged relative to the outer pipe. According to the connecting structure and the trolley, the technical problem that a telescopic sleeve rod type connecting structure in the prior art is prone to shaking in the transportation process is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of transportation tools, in particular to a connecting structure and a trolley. Background Art

[0002] A handcart is a means of transport used to move objects by pushing or pulling. Due to its low cost, ease of use, and portability, it is widely used in production and daily life. Compared to the load-bearing capacity of motor vehicles, handcarts are often used to transport light items over short distances in areas where motor vehicles are inconvenient to access or use. Since handcarts are not frequently used as a means of transport, most are folded up when not in use.

[0003] To minimize storage space after folding, the rod-shaped connecting structure is often configured to be retractable. Retractable rods are often designed to be larger than a smaller rod. For example, retractable rods are installed on either side of the support plate to increase the length or width of the load-bearing surface during use. Alternatively, a small rod can be pulled out of the connecting sleeve between the two wheels to increase the distance between the two wheels, shifting the cart's center of gravity and preventing it from tilting.

[0004] While telescopic rods are simple and efficient, a gap must be left between the smaller rod and the larger rod to facilitate extraction. This gap can cause the trolley to wobble during use, easily spilling items and affecting transport stability.

[0005] Therefore, the prior art needs to be further developed. Utility Model Content

[0006] The purpose of the present invention is to overcome the above technical deficiencies and provide a connection structure and a trolley to solve the technical problem in the related art that the retractable sleeve rod type connection structure is prone to shaking during transportation.

[0007] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: a connection structure is provided, including: an outer tube and an inner tube, the outer tube is sleeved on the inner tube; at least two sliding components, each sliding component includes a roller, the roller is rotatably arranged relative to the inner tube, the roller is located in the inner tube, and the two rollers are arranged opposite to each other; at least two through grooves are provided on the inner tube that penetrate the tube wall of the inner tube, the through grooves are used for the rollers to roll through, and the rollers are abutted against the outer tube through the through grooves, and each through groove is corresponding to each roller; the inner tube is pushed and pulled to drive the roller to move on the inner wall of the outer tube through the through grooves, so that the inner tube can be telescopically arranged relative to the outer tube.

[0008] Furthermore, the sliding assembly also includes a fixed shaft, the roller passes through the fixed shaft, the roller is rotatably arranged relative to the fixed shaft, and both ends of the fixed shaft are respectively fixed on the tube wall of the inner tube.

[0009] Furthermore, the outer tube and the inner tube are both square tubes, and the inner tube includes a first tube wall, a second tube wall, a third tube wall and a fourth tube wall. The first tube wall, the second tube wall, the third tube wall and the fourth tube wall are connected in sequence so that the first tube wall and the third tube wall are arranged opposite to each other, and the second tube wall and the fourth tube wall are arranged opposite to each other.

[0010] Furthermore, there are four sliding components and four through slots, which are respectively arranged on the first tube wall, the second tube wall, the third tube wall and the fourth tube wall. The four rollers are respectively in contact with the outer tube through the four through slots to support the inner tube from different directions.

[0011] Furthermore, the roller and the fixed shaft are detachably connected.

[0012] Furthermore, a limiting groove is provided on the outer tube, and the connection structure also includes a fastener. The limiting groove is provided along the length direction of the outer tube, and the fastener passes through the limiting groove and is connected to the inner tube. When the inner tube is expanded or contracted relative to the outer tube, the fastener moves accordingly in the limiting groove, thereby limiting the expansion and contraction range of the inner tube.

[0013] Furthermore, a through hole is provided on the inner tube, and a fastener passes through the limiting groove and the through hole in sequence to connect the outer tube and the inner tube, and the fastener is detachably provided.

[0014] Furthermore, the connection structure also includes a buffer sleeve, which is buckled on the end of the inner tube away from the outer tube. When the inner tube is contracted into the outer tube, the buffer sleeve is used to buffer the interaction force between the end of the inner tube and the end of the outer tube.

[0015] Furthermore, an exhaust hole is provided on the outer tube, and the exhaust hole and the buffer sleeve are provided correspondingly. When the inner tube contracts, the buffer sleeve is squeezed so that the gas in the buffer sleeve is discharged from the exhaust hole.

[0016] A trolley includes a first wheel and a second wheel, and also includes the connection structure as described above, wherein the first wheel is connected to an outer tube, and the second wheel is connected to an inner tube, and the distance between the second wheel and the first wheel is adjusted by extending and retracting the inner tube relative to the outer tube.

[0017] Beneficial effects:

[0018] 1. The connection structure of the utility model is provided with rollers on the four sides of the inner tube so that the rollers can abut against the outer tube from four directions. The rollers on the inner tube support the outer tube on all four sides to avoid shaking caused by gaps between the inner and outer tubes, thereby improving the stability of the connection structure.

[0019] 2. A trolley equipped with this connection structure can flexibly adapt to different usage scenarios and terrain conditions by adjusting the wheel spacing through the telescopic movement of the inner and outer tubes. Whether in narrow passages, on stairs, or on uneven outdoor surfaces, users can adjust the wheel spacing according to actual needs to improve the trolley's maneuverability and stability.

[0020] 3. With the connection structure and trolley of the present invention, when not in use, the user can shrink the inner tube to reduce the overall size of the trolley, thereby saving storage space.

[0021] 4. The connection structure and trolley of the present invention can adjust the wheel spacing by telescoping the inner tube and the outer tube when loading heavy objects, thereby reducing the risk of rollover. The wider wheel spacing can provide better support and balance, thereby ensuring the safety of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a connection structure adopted in an embodiment of the present utility model from one perspective;

[0023] Figure 2 This is a structural diagram of the connection structure adopted in the embodiment of the present utility model from another perspective;

[0024] Figure 3 This is a structural diagram of the inner tube of the connection structure adopted in the embodiment of the present utility model;

[0025] Figure 4 This is a schematic structural diagram of a trolley used in an embodiment of the present utility model;

[0026] Figure 5 It is a cross-sectional view of a trolley adopted in an embodiment of the present utility model.

[0027] The above drawings include the following reference numerals:

[0028] 1. Outer tube; 11. Limiting groove; 12. Exhaust hole; 2. Inner tube; 21. Through groove; 22. First tube wall; 23. Second tube wall; 24. Third tube wall; 25. Fourth tube wall; 26. Perforation; 3. Sliding assembly; 31. Roller; 32. Fixed shaft; 4. Fastener; 5. Buffer sleeve; 6. First wheel; 7. Second wheel. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0030] According to an embodiment of the present invention, a connection structure is provided. Figures 1 to 3 The invention comprises an outer tube 1 and an inner tube 2, wherein the outer tube 1 is sleeved on the inner tube 2; at least two sliding assemblies 3, each of which includes a roller 31, which is rotatably arranged relative to the inner tube 2. The roller 31 is located in the inner tube 2, and the two rollers 31 are arranged opposite each other; the inner tube 2 is provided with at least two through-slots 21 that penetrate the wall of the inner tube 2, and the through-slots 21 are used for the rollers 31 to roll through. The rollers 31 abut against the outer tube 1 through the through-slots 21, and each through-slot 21 is corresponding to each roller 31; pushing and pulling the inner tube 2 drives the rollers 31 to move on the inner wall of the outer tube 1 through the through-slots 21, so that the inner tube 2 is arranged telescopically relative to the outer tube 1. By pushing and pulling the inner tube 2, the rollers 31 roll in the through-slots 21, thereby achieving relative movement between the inner tube 2 and the outer tube 1. This design makes the inner tube 2 telescopic and can be adjusted in length as needed. The rollers 31 are rotatably mounted relative to the inner tube 2 and contact the inner wall of the outer tube 1 during rolling. Compared to sliding friction, rolling friction significantly reduces resistance during movement, making the inner tube 2's extension and retraction within the outer tube 1 smoother. The reduced resistance of the rollers 31 means less force is required when pushing and pulling the inner tube 2, thereby improving operational efficiency and convenience. The corresponding slots 21 and rollers 31 ensure stability and accuracy during rolling, preventing the rollers 31 from shifting or getting stuck during movement. Furthermore, the rollers 31's contact with the outer tube 1 through the slots 21 improves load-bearing capacity. The two rollers 31 are positioned relative to each other, ensuring they support the outer tube 1 in opposing directions, such as up and down or left and right, preventing the inner tube 2 from rocking within the outer tube 1 and ensuring the stability of the connection structure. This connection structure addresses the technical issue of telescopic sleeve-type connections in the related art, which are prone to rocking during transportation.

[0031] In this embodiment, the roller 31 is made of rubber material and can also achieve a shock-absorbing effect.

[0032] See Figure 1 and Figure 3In this embodiment of the connection structure, the sliding assembly 3 further includes a fixed shaft 32, through which a roller 31 passes. The roller 31 is rotatably mounted relative to the fixed shaft 32, and the ends of the fixed shaft 32 are fixed to the wall of the inner tube 2. By connecting the ends of the fixed shaft 32 to the wall of the inner tube 2, when external forces act on the inner tube 2, such as vehicle loads, these forces are more effectively distributed to the wall of the inner tube 2 via the roller 31 and fixed shaft 32. This load distribution improves the overall load-bearing capacity of the connection structure.

[0033] See Figure 1 、 Figure 2 and Figure 3 In this embodiment, the connection structure comprises a square tube structure, in which both the outer tube 1 and the inner tube 2 are square tubes. The inner tube 2 comprises a first tube wall 22, a second tube wall 23, a third tube wall 24, and a fourth tube wall 25. The first tube wall 22, the second tube wall 23, the third tube wall 24, and the fourth tube wall 25 are sequentially connected around each other, so that the first tube wall 22 and the third tube wall 24 are opposite each other, and the second tube wall 23 and the fourth tube wall 25 are opposite each other. The square tube structure is more stable when subjected to bending or torsional forces. As a common type of tube material, square tubes are simple to produce and have low manufacturing costs.

[0034] See Figure 1 、 Figure 2 and Figure 3 In the connection structure of this embodiment, there are four sliding components 3 and four through slots 21. The four through slots 21 are respectively arranged on the first tube wall 22, the second tube wall 23, the third tube wall 24 and the fourth tube wall 25. The four rollers 31 respectively abut against the outer tube 1 through the four through slots 21, supporting the inner tube 2 from different directions. This design allows the inner tube 2 to receive a more uniform and stable support force during the extension and retraction process, reducing the risk of deformation or damage caused by uneven force. The multi-directional support not only enhances the stability of the inner tube 2 during the extension and retraction process, but also improves the overall stability of the entire connection structure when subjected to external loads. The four rollers 31 roll simultaneously, which can more effectively disperse the frictional resistance between the inner tube 2 and the outer tube 1. This dispersion effect makes the rolling process smoother and reduces the problems of jamming or wear caused by excessive frictional resistance.

[0035] In the connection structure of this embodiment, the roller 31 and the fixed shaft 32 are detachably connected to facilitate maintenance and replacement.

[0036] See Figure 1In this embodiment, the connection structure is provided with a limiting groove 11 on the outer tube 1. The connection structure also includes a fastener 4. The limiting groove 11 is arranged along the length of the outer tube 1. The fastener 4 passes through the limiting groove 11 and connects to the inner tube 2. When the inner tube 2 expands or contracts relative to the outer tube 1, the fastener 4 moves within the limiting groove 11, thereby limiting the expansion and contraction range of the inner tube 2. The fastener 4 not only limits the expansion and contraction range of the inner tube 2, but also serves to secure the inner tube 2. Through the cooperation between the fastener and the limiting groove 11, the inner tube 2 can maintain a relatively stable position during expansion and contraction, reducing the possibility of shaking and deviation, and improving the stability of the entire connection structure.

[0037] See Figure 1 and Figure 2 In this embodiment, the connection structure is provided with a through-hole 26 on the inner tube 2. The fastener 4 sequentially passes through the retaining groove 11 and the through-hole 26 to connect the outer tube 1 and the inner tube 2. The fastener 4 is detachable. After passing through the retaining groove 11 and the through-hole 26, the fastener 4 securely connects the outer tube 1 and the inner tube 2. This connection reduces the risk of loosening or separation due to vibration or external forces. Since the fastener 4 is detachable, the various components of the connection structure can be easily disassembled and inspected during maintenance, extending the service life of the connection structure.

[0038] See Figure 1 and Figure 3 The connection structure of this embodiment also includes a buffer sleeve 5, which covers the end of the inner tube 2 away from the outer tube 1. When the inner tube 2 is retracted into the outer tube 1, the buffer sleeve 5 is used to buffer the interaction force between the ends of the inner tube 2 and the outer tube 1. If the inner tube 2 is pushed hard into the outer tube 1, a large impact force may be generated between the inner tube 2 and the outer tube 1. The buffer sleeve 5 can effectively absorb and disperse this impact force, thereby protecting the inner tube 2 and the outer tube 1 from damage.

[0039] See Figure 1 and Figure 2 In the connection structure of this embodiment, an exhaust hole 12 is further provided on the outer tube 1. The exhaust hole 12 and the buffer sleeve 5 are provided correspondingly. When the inner tube 2 contracts, the buffer sleeve 5 is squeezed so that the gas in the buffer sleeve 5 is discharged from the exhaust hole 12. When the inner tube 2 is about to be completely contracted into the outer tube 1, the inner tube 2 and the outer tube 1 will squeeze the buffer sleeve 5, causing the gas in the buffer sleeve 5 to be compressed. The exhaust hole 12 is provided to discharge these compressed gases smoothly, thereby maintaining the balance of internal and external pressures. After the gas is discharged, the resistance encountered by the inner tube 2 during the contraction process is reduced, making the contraction of the inner tube 2 smoother and more stable.

[0040] See Figure 4 and Figure 5The cart of this embodiment includes a first wheel 6 and a second wheel 7, as well as the connection structure described above. The first wheel 6 is connected to the outer tube 1, and the second wheel 7 is connected to the inner tube 2. The distance between the second wheel 7 and the first wheel 6 is adjusted by the inner tube 2 extending and retracting relative to the outer tube 1. Changing the distance between the second wheel 7 and the first wheel 6 allows the cart to better distribute the load and improve its carrying capacity. When moving a heavy load, the larger wheel spacing effectively prevents the risk of tipping over. When not in use, the wheel spacing can be reduced to reduce the overall size of the cart, saving storage space.

[0041] The trolley of this embodiment is similar to an outdoor leisure trolley. By adjusting the wheel spacing, the trolley can better adapt to different terrains and road conditions. For example, on uneven beaches, increasing the wheel spacing can improve the trolley's stability and maneuverability; in narrow aisles, decreasing the wheel spacing can make the trolley easier to pass.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0044] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0045] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0046] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A connection structure, characterized in that: include: An outer tube (1) and an inner tube (2), wherein the outer tube (1) is sleeved on the inner tube (2); at least two sliding assemblies (3), each of the sliding assemblies (3) comprising a roller (31), the roller (31) being rotatably arranged relative to the inner tube (2), the roller (31) being located in the inner tube (2), and the two rollers (31) being arranged opposite to each other; The inner tube (2) is provided with at least two through grooves (21) penetrating the tube wall of the inner tube (2), the through grooves (21) being used for the roller (31) to roll through, and the roller (31) abuts against the outer tube (1) through the through grooves (21), and each through groove (21) is correspondingly provided with each roller (31); the inner tube (2) is pushed and pulled, driving the roller (31) to move on the inner wall of the outer tube (1) through the through grooves (21), so that the inner tube (2) is telescopically provided relative to the outer tube (1).

2. The connection structure according to claim 1, characterized in that: The sliding assembly (3) further comprises a fixed shaft (32), the roller (31) passes through the fixed shaft (32), the roller (31) is rotatably arranged relative to the fixed shaft (32), and both ends of the fixed shaft (32) are respectively fixed to the tube wall of the inner tube (2).

3. The connection structure according to claim 2, characterized in that: The outer tube (1) and the inner tube (2) are both square tubes; the inner tube (2) comprises a first tube wall (22), a second tube wall (23), a third tube wall (24) and a fourth tube wall (25); the first tube wall (22), the second tube wall (23), the third tube wall (24) and the fourth tube wall (25) are sequentially connected around each other so that the first tube wall (22) and the third tube wall (24) are arranged opposite to each other, and the second tube wall (23) and the fourth tube wall (25) are arranged opposite to each other.

4. The connection structure according to claim 3, characterized in that: There are four sliding assemblies (3), four through grooves (21), and the four through grooves (21) are respectively arranged on the first tube wall (22), the second tube wall (23), the third tube wall (24), and the fourth tube wall (25). The four rollers (31) respectively contact the outer tube (1) through the four through grooves (21) to support the inner tube (2) from different directions.

5. The connection structure according to claim 2, characterized in that: The roller (31) and the fixed shaft (32) are detachably connected.

6. The connection structure according to claim 1, characterized in that: A limiting groove (11) is provided on the outer tube (1), and the connection structure further comprises a fastener (4). The limiting groove (11) is provided along the length direction of the outer tube (1), and the fastener (4) passes through the limiting groove (11) and is connected to the inner tube (2). When the inner tube (2) is extended or retracted relative to the outer tube (1), the fastener (4) moves in the limiting groove (11) accordingly, thereby limiting the extension and retraction range of the inner tube (2).

7. The connection structure according to claim 6, characterized in that: The inner tube (2) is provided with a through hole (26), and the fastener (4) passes through the limiting groove (11) and the through hole (26) in sequence to connect the outer tube (1) and the inner tube (2), and the fastener (4) is detachably provided.

8. The connection structure according to claim 1, characterized in that: The connection structure further comprises a buffer sleeve (5), which is buckled on the end of the inner tube (2) away from the outer tube (1). When the inner tube (2) is retracted into the outer tube (1), the buffer sleeve (5) is used to buffer the interaction force between the end of the inner tube (2) and the end of the outer tube (1).

9. The connection structure according to claim 8, characterized in that: The outer tube (1) is further provided with an exhaust hole (12), and the exhaust hole (12) and the buffer sleeve (5) are correspondingly arranged. When the inner tube (2) contracts, it squeezes the buffer sleeve (5) so that the gas in the buffer sleeve (5) is discharged from the exhaust hole (12).

10. A trolley comprising a first wheel (6) and a second wheel (7), characterized in that: It also includes a connection structure as described in any one of claims 1 to 9, wherein the first wheel (6) is connected to the outer tube (1), and the second wheel (7) is connected to the inner tube (2), and the distance between the second wheel (7) and the first wheel (6) is adjusted by extending and retracting the inner tube (2) relative to the outer tube (1).

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