Universal wheel of draw-bar box

Abstract

The utility model relates to the technical field of universal wheels, and discloses a draw-bar box universal wheel which comprises a wheel body assembly and a telescopic rod structure, the wheel body assembly is in threaded connection with the bottom of the telescopic rod structure, the telescopic rod structure comprises a movable hollow rod, a guide hole is formed in the surface of the movable hollow rod, and a limiting protruding block is connected in the guide hole in a sliding mode. The bottom of the limiting protruding block is fixedly connected with two elastic pieces, a spring is installed between the tail portions of the elastic pieces, and the elastic pieces are movably connected into limiting holes formed in the middle of the limiting block. Through the arrangement of the limiting convex blocks, the elastic pieces, the springs and the limiting blocks, the height of the box body can be vertically adjusted through the universal wheels according to specific conditions, and the situation that in the rainstorm weather, when too much water is accumulated on the ground, the box body is soaked by rainwater, and articles contained in the box are damaged is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of casters, in particular to a universal caster for a trolley case. Background Art

[0002] A trolley case refers to a luggage case with a pull rod and wheels. Because of its convenience, it is widely used for traveling and going out to carry clothes, etc. An important component of a trolley case is the wheel, and the quality of the wheel directly affects people's mood during travel. Wheels of unqualified quality not only waste the user's physical strength but also bring many inconveniences to life. A universal caster is a so-called swivel caster, and its structure allows 360-degree horizontal rotation. Casters are a general term, including swivel casters and fixed casters. Fixed casters do not have a rotating structure and cannot rotate horizontally but can only rotate vertically. These two types of casters are generally used in combination. For example, the structure of a handcart is two fixed wheels at the front and two swivel universal casters near the pushing armrest at the back. A universal caster refers to a caster whose wheel bracket can rotate 360 degrees horizontally under dynamic or static loads. Nowadays, fundamental problems often occur with the universal casters of trolley cases, such as dust entering the wheel body, inconvenient rolling, and inability to rotate synchronously in a timely manner during rotation. In addition, the wheels produce loud noise, affecting the normal life of others, and these aspects need to be continuously improved.

[0003] Application No. 201520817700.X discloses a silent universal caster for a trolley case, including an arc-shaped roller protection shell, a box body connecting plate, a universal rotating shaft, and a rotating center shaft. Bearing end caps are installed at both ends of the rotating center shaft. A hub is installed on one side of the bearing end cap. A plastic wheel sleeve is installed on the outside of the hub. The arc-shaped roller protection shell is installed above the roller. The box body connecting plate is installed above the arc-shaped roller protection shell. Locking screws are installed inside the box body connecting plate. A set screw is installed between the arc-shaped roller protection shell and the box body connecting plate with a gap. The universal rotating shaft is installed inside the arc-shaped roller protection shell. A universal rotating disc is installed at the upper end of the universal rotating shaft. The core equipment of the wheel, the rotating center shaft and the bearing, has good lubrication effect, no noise, and excellent silent effect; when problems occur, the structural design is reasonable, it is convenient to replace parts, the price is fair, and it is conducive to popularization and use.

[0004] The universal caster for a trolley case disclosed in the above document has the following defects: when encountering heavy rain and serious water accumulation on the road surface, this universal caster cannot avoid the box body being soaked by water by raising the box body, which affects the items contained in the box.

[0005] It can be seen that the existing universal casters for trolley cases do not have a telescopic function, and it is necessary to improve the existing deficiencies and provide a telescopic function. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a universal wheel for a trolley case, so as to solve the problems raised in the above background technology.

[0007] To solve the above technical problems, the present utility model is realized through the following technical solutions:

[0008] The present utility model is a universal wheel for a trolley case, including a wheel body assembly and a telescopic rod structure. The wheel body assembly is threadedly connected to the bottom of the telescopic rod structure. The telescopic rod structure includes a movable hollow rod. Guide holes are provided on the surface of the movable hollow rod. A limit convex block is slidably connected in the guide holes. Two elastic pieces are fixedly connected to the bottom of the limit convex block. A spring is installed between the tails of the elastic pieces. The elastic pieces are movably connected in the limit holes provided in the middle of the limit block.

[0009] Furthermore, the movable hollow rod is sleeved inside a fixed hollow rod. The fixed hollow rod is threadedly connected to the top of a second mounting plate.

[0010] Furthermore, limit grooves are provided on the surfaces of the fixed hollow rod and the movable hollow rod.

[0011] Furthermore, the second mounting plate is threadedly connected to the top of a first mounting plate. An installation block is fixedly installed at the bottom of the first mounting plate.

[0012] Furthermore, a movable block is movably connected inside the installation block. Two fixing plates are fixedly connected to the bottom of the movable block.

[0013] Furthermore, a wheel body is threadedly connected between the two fixing plates.

[0014] The present utility model has the following beneficial effects:

[0015] (1) Through the settings of the limit convex block, elastic pieces, spring and limit block in the present utility model, when it is necessary to raise the height of the box body, this operation can be achieved by pressing the limit convex block. During this process, the limit convex block contracts inward under the action of force, driving the connected elastic pieces to move deeper. The ends of the two elastic pieces away from the limit convex block slide along the inner wall of the movable hollow rod. The distance between the two elastic pieces becomes larger and larger. Therefore, the spring is continuously stretched under the drive of the two elastic pieces and is in a taut state. At this time, pulling the fixed hollow rod drives the movable hollow rod to slide outward along the inner wall of the fixed hollow rod until the limit convex block reaches the hole provided on the surface of the fixed hollow rod. Then the spring starts to contract, causing the two elastic pieces to slide inward, forcing the limit convex block to protrude from the hole on the surface of the fixed hollow rod and fixing the height of the box body. The limit block ensures that the elastic pieces will not be misaligned during this process.

[0016] When it is necessary to reduce the height of the box body, the limit bump can be pressed first, and then the fixed hollow rod is pushed so that the movable hollow rod slides inward along the inner wall. Then, the telescopic structure inside the movable hollow rod will undergo the same process as when the height of the box body is increased above. Finally, it reaches another hole on the fixed hollow rod for fixation.

[0017] Of course, it is not necessary for any product implementing the present utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 Structural schematic diagram of the present utility model;

[0020] Figure 2 Structural schematic diagram of the wheel body structure of the present utility model;

[0021] Figure 3 Structural schematic diagram of the telescopic rod structure of the present utility model;

[0022] Figure 4 Structural schematic diagram of the telescopic structure of the present utility model;

[0023] Figure 5 Cross-sectional structural schematic diagram of the telescopic rod of the present utility model;

[0024] In the drawings, the list of components represented by each reference numeral is as follows:

[0025] In the figure: 1. Wheel body assembly; 101. Wheel body; 102. Fixed plate; 103. Movable block; 104. Mounting block; 105. First mounting plate; 2. Telescopic rod structure; 201. Second mounting plate; 202. Fixed hollow rod; 203. Movable hollow rod; 204. Limit groove; 205. Limit bump; 206. Elastic sheet; 207. Spring; 208. Limit block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0027] Please refer to Figure 1 - Figure 5 As shown, the utility model relates to a universal wheel for a trolley case, which comprises a wheel body assembly 1 and a telescopic rod structure 2. The wheel body assembly 1 is threadedly connected to the bottom of the telescopic rod structure 2. The telescopic rod structure 2 includes a movable hollow rod 203. A guide hole is formed on the surface of the movable hollow rod 203. A limit convex block 205 is slidably connected in the guide hole. Two elastic pieces 206 are fixedly connected to the bottom of the limit convex block 205. A spring 207 is installed between the tails of the elastic pieces 206. The elastic pieces 206 are movably connected in a limit hole formed in the middle of a limit block 208. The purpose of such a setting is that when it is necessary to raise the height of the box body, this operation can be achieved by pressing the limit convex block 205. During this process, the limit convex block 205 contracts inward under the action of force, driving the connected elastic pieces 206 to move deeper. One ends of the two elastic pieces 206 away from the limit convex block 205 slide along the inner wall of the movable hollow rod 203, and the distance between the two elastic pieces 206 becomes larger and larger. Therefore, the spring 207 is continuously stretched under the drive of the two elastic pieces 206 and is in a taut state. At this time, pulling the fixed hollow rod 202 drives the movable hollow rod 203 to slide out along the inner wall of the fixed hollow rod 202 until the limit convex block 205 reaches a hole formed on the surface of the fixed hollow rod 202, the spring 207 starts to contract, causing the two elastic pieces 206 to slide inward, forcing the limit convex block 205 to protrude from the hole on the surface of the fixed hollow rod 202 to fix the height of the box body. The limit block 208 ensures that the elastic pieces 206 will not be misaligned during this process; when it is necessary to lower the height of the box body, the limit convex block 205 can be pressed first, and then the fixed hollow rod 202 is pushed to make the movable hollow rod 203 slide inward along the inner wall. Then, the telescopic structure inside the movable hollow rod 203 will undergo the same process as when raising the height of the box body above, and finally reach another hole on the fixed hollow rod 202 for fixation.

[0028] The movable hollow rod 203 is sleeved inside the fixed hollow rod 202. The fixed hollow rod 202 is threadedly connected to the top of the second mounting plate 201.

[0029] Limit grooves 204 are provided on the surfaces of the fixed hollow rod 202 and the movable hollow rod 203. The purpose of such a setting is that limit grooves 204 are provided on the surfaces of the fixed hollow rod 202 and the movable hollow rod 203, which can effectively prevent relative sliding between the two.

[0030] The second mounting plate 201 is threadedly connected to the top of the first mounting plate 105. A mounting block 104 is fixedly installed at the bottom of the first mounting plate 105.

[0031] An active block 103 is movably connected inside the mounting block 104, and two fixing plates 102 are fixedly connected to the bottom of the active block 103. The purpose of this setting is that when steering is required, the active block 103 will rotate along the inner wall of the mounting block 104 under the drive of forces in different directions, so as to realize the rotation of the universal wheel mounted on the active block 103.

[0032] A wheel body 101 is threadedly connected between the two fixing plates 102.

[0033] During use, the purpose of this setting is that when steering is required, the active block 103 will rotate along the inner wall of the mounting block 104 under the drive of forces in different directions, so as to realize the rotation of the universal wheel mounted on the active block 103.

[0034] When it is necessary to raise the height of the box body, this operation can be achieved by pressing the limit convex block 205. During this process, the limit convex block 205 contracts inward under the action of force, driving the associated elastic sheet 206 to move deeper. One end of the two elastic sheets 206 away from the limit convex block 205 slides along the inner wall of the movable hollow rod 203, and the distance between the two elastic sheets 206 becomes larger and larger. Therefore, the spring 207 is continuously stretched under the drive of the two elastic sheets 206 and is in a taut state. At this time, pulling the fixed hollow rod 202 drives the movable hollow rod 203 to slide outward along the inner wall of the fixed hollow rod 202 until the limit convex block 205 reaches the hole opened on the surface of the fixed hollow rod 202. Then the spring 207 starts to contract, causing the two elastic sheets 206 to slide inward, forcing the limit convex block 205 to protrude from the hole on the surface of the fixed hollow rod 202 to fix the height of the box body. The limit block 208 ensures that the elastic sheet 206 will not be misaligned during this process.

[0035] When it is necessary to lower the height of the box body, the limit convex block 205 can be pressed first, and then the fixed hollow rod 202 is pushed to make the movable hollow rod 203 slide inward along the inner wall. Then the telescopic structure inside the movable hollow rod 203 will undergo the same process as when raising the height of the box body above, and finally reach another hole on the fixed hollow rod 202 for fixation.

[0036] Limit grooves 204 are provided on the surfaces of the fixed hollow rod 202 and the movable hollow rod 203, which can effectively prevent relative sliding between the two.

[0037] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present utility model, so that those skilled in the relevant art can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A universal wheel for a trolley case, comprising a wheel body assembly (1) and a telescopic rod structure (2), characterized in that: The wheel body assembly (1) is threadedly connected to the bottom of the telescopic rod structure (2); The telescopic rod structure (2) includes a movable hollow rod (203); A guide hole is provided on the surface of the movable hollow rod (203), and a limit bump (205) is slidably connected in the guide hole; Two elastic pieces (206) are fixedly connected to the bottom of the limit bump (205), and a spring (207) is installed between the tails of the elastic pieces (206); The elastic piece (206) is movably connected in a limit hole provided in the middle of the limit block (208).

2. The universal wheel of a trolley case according to claim 1, wherein: The movable hollow rod (203) is sleeved inside the fixed hollow rod (202), and the fixed hollow rod (202) is threadedly connected to the top of the second mounting plate (201).

3. The universal wheel for a trolley case according to claim 2, wherein: Limit grooves (204) are provided on the surfaces of the fixed hollow rod (202) and the movable hollow rod (203).

4. The universal wheel for a trolley case according to claim 2, characterized in that: The second mounting plate (201) is threadedly connected to the top of the first mounting plate (105), and a mounting block (104) is fixedly installed at the bottom of the first mounting plate (105).

5. The universal wheel for a trolley case according to claim 4, characterized in that: A movable block (103) is movably connected inside the mounting block (104), and two fixing plates (102) are fixedly connected to the bottom of the movable block (103).

6. The universal wheel of a trolley case according to claim 5, characterized in that: A wheel body (101) is threadedly connected between the two fixing plates (102).

Images