Traveling case caster

Abstract

A traveling case caster, comprising a fixed seat (1) fixed to the bottom of a traveling case, a wheel seat (2) arranged below the fixed seat (1), a wheel (3) rotationally connected to the wheel seat (2), and a vertical shaft (4) axially connected to the fixed seat (1) and the wheel seat (2), wherein a lower mounting portion (11) extends downwards from the bottom of the fixed seat (1); an upper mounting portion (21) extends upwards from the top of the wheel seat (2); the upper mounting portion (21) and the lower mounting portion (11) are inserted and positioned one inside the other, and a cylindrical first mounting accommodating cavity (5) is formed by inner areas of the upper mounting portion and the lower mounting portion; and a limiting table (41) extends outwards from the middle portion of the vertical shaft (4), the limiting table (41) is located in the first mounting accommodating cavity (5), a plane bearing (7) is provided below the limiting table (41), and a top surface and a bottom surface of the plane bearing (7) tightly fit against a bottom surface of the limiting table (41) and a top surface of the wheel seat (2), respectively, to ensure that the wheel seat (2) freely rotates by 360 degrees relative to the vertical shaft (4) by means of the plane bearing (7). The traveling case caster has a good structural strength, can bear a larger pressure, has good rotation effects and good damping effects, and is not prone to damage.

Description

Suitcase caster Technical Field

[0001] The present application relates to a suitcase assembly, and in particular to a suitcase caster. Background Art

[0002] Luggage is an essential tool for transporting belongings on long journeys, especially suitcases equipped with casters, which allow passengers to easily transport their luggage to various destinations by simply pulling the handle. While casters are a key factor in making luggage so convenient to carry, they are also the most vulnerable part of a suitcase, as they bear the entire weight of the suitcase and may roll over uneven and bumpy surfaces.

[0003] Conventional casters for luggage include a roller, a wheel base for rotatably mounting the roller, and a mounting base for connecting the wheel base and securing the luggage. The mounting base of the caster is secured to the luggage by threading a number of screws from the interior of the luggage to the mounting base outside the luggage, securing the luggage to the mounting base. The connection between the wheel base and the mounting base generally includes fixed and rotating connections. Rotating connections typically utilize a simple hinged connection to achieve free rotation. This can cause the roller to become stuck and unable to rotate freely on uneven roads during use, and the high pressure on the connection makes it susceptible to damage.

[0004] Summary of the Invention

[0005] In response to the above problems, the present application aims to provide a suitcase caster with good structural strength, capable of withstanding greater pressure, having good rotation effect, good shock absorption effect, and not easy to be damaged.

[0006] The technical solution of the present application is a suitcase caster, comprising a fixed base fixed to the bottom of the suitcase, a wheel seat arranged below the fixed base, a roller rotatably connected to the wheel seat, and a vertical shaft axially connecting the fixed base and the wheel seat, a lower mounting portion extending downward from the bottom of the fixed base, an upper mounting portion extending upward from the top of the wheel seat, the upper mounting portion and the lower mounting portion being inserted into and positioned with each other and forming a cylindrical first mounting cavity in the internal area of ​​the two, a limit platform extending outward from the middle of the vertical shaft, the limit platform being located in the first mounting cavity, a plane bearing being arranged below the limit platform, the top and bottom surfaces of the plane bearing being respectively in contact with the bottom surface of the limit platform and the top surface of the wheel seat, to ensure that the wheel seat can rotate 360° freely relative to the vertical shaft under the transmission of the plane bearing.

[0007] Optionally, a shock-absorbing spring is provided above the limit platform, and the upper and lower ends of the shock-absorbing spring respectively press and contact the fixed seat and the limit platform. Under the elastic force of the shock-absorbing spring, the bottom surface of the limit platform is attached to and pressed against the top surface of the plane bearing.

[0008] Optionally, the top of the vertical shaft passes through the fixing seat and is then turned outward and riveted to the top surface of the fixing seat or welded to the top surface of the fixing seat or connected to the top surface of the fixing seat through a connecting piece.

[0009] Optionally, an annular groove is provided on the bottom surface of the vertical shaft, and a positioning pin is laterally provided in the wheel seat. After passing through the annular groove, the positioning pin is fixed in the wheel seat and limits the axial position of the vertical shaft.

[0010] Optionally, the plane bearing is a plane needle roller bearing or a plane ball bearing.

[0011] Optionally, rollers are hinged on the left and right sides of the wheel seat.

[0012] Optionally, a second mounting cavity is provided on the roller, and a normal bearing is installed in the second mounting cavity, so that the roller can roll smoothly when the suitcase is loaded.

[0013] Optionally, the shock-absorbing spring is a helical spring or a disc spring.

[0014] Optionally, there may be multiple disc springs that are stacked vertically.

[0015] Optionally, the roller is provided with a through hole communicating with the annular groove.

[0016] The present application sets a plane bearing between the wheel seat and the vertical shaft, and sets a shock-absorbing spring between the fixed seat and the vertical shaft, so that the caster with this structure can withstand greater pressure, has good structural strength, good rotation effect, and is not easy to be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic diagram of the three-dimensional structure of an embodiment of a suitcase caster of the present application;

[0018] FIG2 is a front view of an embodiment of a suitcase caster of the present application;

[0019] FIG3 is a cross-sectional view of a structure without a shock-absorbing spring along the AA direction of FIG2 ;

[0020] FIG4A is a cross-sectional view of a structure with a shock-absorbing spring along the AA direction in FIG2 ;

[0021] FIG4B is a cross-sectional view of another structure with a shock-absorbing spring along the AA direction in FIG2;

[0022] FIG5 is a schematic diagram of a connection structure of the roller, wheel seat, and vertical shaft of the present application;

[0023] FIG6A is an exploded view of an embodiment of a suitcase caster of the present application;

[0024] FIG6B is an exploded view of an embodiment of a suitcase caster of the present application;

[0025] Among them: 1—fixed seat; 11—lower mounting part; 2—wheel seat; 21—upper mounting part; 3—roller; 4—vertical shaft; 41—limiting platform; 42—annular groove; 5—first mounting cavity; 6—shock-absorbing spring; 7—plane bearing; 8—connecting piece; 9—second mounting cavity. DETAILED DESCRIPTION

[0026] The present application is further described in detail below with reference to the accompanying drawings.

[0027] As shown in Figures 1 to 5, the present application provides a suitcase caster, including a fixed base 1 fixed to the bottom of the suitcase, a wheel base 2 arranged below the fixed base 1, a roller 3 rotatably connected to the wheel base 2, and a vertical shaft 4 axially connecting the fixed base 1 and the wheel base 2. The bottom of the fixed base 1 extends downwardly from a lower mounting portion 11, and the top of the wheel base 2 extends upwardly from an upper mounting portion 21. The upper mounting portion 21 and the lower mounting portion 11 are inserted into each other and positioned to form a cylindrical first mounting cavity 5 in the internal area of ​​the two. A limit platform 41 extends outward from the middle of the vertical shaft 4. The limit platform 41 is located in the first mounting cavity 5. A plane bearing 7 is provided below the limit platform 41. The top and bottom surfaces of the plane bearing 7 are respectively tightly attached to the bottom surface of the limit platform 41 and the top surface of the wheel base 2, to ensure that the wheel base 2 can rotate 360° freely relative to the vertical shaft 4 under the transmission of the plane bearing 7.

[0028] On the basis of the above scheme, as shown in Figures 4A and 4B, a shock-absorbing spring 6 is provided above the limit platform 41. The upper and lower ends of the shock-absorbing spring 6 respectively squeeze and contact the fixed seat 1 and the limit platform 41. Under the elastic force of the shock-absorbing spring 6, the bottom surface of the limit platform 41 is in contact with and presses the top surface of the plane bearing 7.

[0029] Specifically, the top of the vertical shaft 4 passes through the fixing seat 1 and is then turned outward and riveted to the top surface of the fixing seat 1 or welded to the top surface of the fixing seat 1 or connected to the top surface of the fixing seat 1 through a connector 8.

[0030] In addition, an annular groove 42 is provided on the bottom surface of the vertical shaft 4 , and a positioning pin is transversely provided in the wheel seat 2 . The positioning pin passes through the annular groove 42 and is fixed in the wheel seat 2 to limit the axial position of the vertical shaft 4 .

[0031] Furthermore, the plane bearing 7 is a plane needle roller bearing or a plane ball bearing. A plane needle roller bearing is a roller bearing with cylindrical rollers that are thin and long relative to their diameter. These rollers are called needle rollers. Despite their small cross-section, the bearings still have a high load-bearing capacity. A plane ball bearing differs from a plane needle roller bearing in that the rollers are spherical.

[0032] Furthermore, rollers 3 are hinged on the left and right sides of the wheel seat 2.

[0033] Optionally, referring to Figures 6A and 6B, a second mounting cavity 9 is provided on the roller 3, and a normal bearing is installed in the second mounting cavity 9, so that the roller 3 can roll smoothly when the suitcase is loaded.

[0034] Optionally, the above-mentioned ordinary bearing is a ball bearing.

[0035] Optionally, the shock-absorbing spring is a helical spring or a disc spring.

[0036] Optionally, referring to FIG4A , the shock absorbing spring 6 is a helical spring.

[0037] Optionally, referring to FIG4B , the shock absorbing spring 6 is a disc spring. The disc spring is conical and can be used alone or in series or in parallel.

[0038] Optionally, referring to FIG. 4B , a plurality of disc springs 6 are stacked.

[0039] Optionally, referring to FIG. 5 , the roller 3 is provided with a through hole communicating with the annular groove 42 .

[0040] In the present application, the fixed seat 1 and the wheel seat 2 are connected into an integrated structure through the vertical shaft 4. The upper part of the limit platform 41 in the middle of the vertical shaft 4 realizes the shock absorption of the entire structure through the shock-absorbing spring 6, and at the same time prompts the vertical shaft 4 to press the upper seat ring of the plane bearing 7 downward. At this time, the lower seat ring of the plane bearing is tightly attached to the wheel seat 2. The upper and lower seat rings can rotate freely relative to each other under the action of the middle retaining frame and rolling body, thereby realizing the free rotation of the wheel seat 2 relative to the vertical shaft 4 and the 360° free rotation of the roller 3 relative to the suitcase. At the same time, when the suitcase is pushed on a rugged road, the shock-absorbing spring 6 is forced to move up and down, which can effectively reduce shock.

[0041] The above is only a preferred implementation method of the present application and does not impose any form of limitation on the application. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principles of the present application still falls within the scope of the technical solution of the present application.

Claims

1. A suitcase caster, comprising a fixing seat (1) fixed to the bottom of the suitcase, a wheel seat (2) arranged below the fixing seat (1), a roller (3) rotatably connected to the wheel seat (2), and a vertical shaft (4) axially connecting the fixing seat (1) and the wheel seat (2), characterized in that: A lower mounting portion (11) extends downward from the bottom of the fixed seat (1), and an upper mounting portion (21) extends upward from the top of the wheel seat (2); the upper mounting portion (21) and the lower mounting portion (11) are inserted into each other for positioning and form a cylindrical first mounting cavity (5) in their inner regions; a limiting platform (41) extends outward from the middle of the vertical shaft (4); the limiting platform (41) is located in the first mounting cavity (5); a plane bearing (7) is arranged below the limiting platform (41); the top surface and bottom surface of the plane bearing (7) are respectively in close contact with the bottom surface of the limiting platform (41) and the top surface of the wheel seat (2), so as to ensure that the wheel seat (2) can freely rotate 360 ​​degrees relative to the vertical shaft (4) under the transmission of the plane bearing (7).

2. The suitcase caster according to claim 1, characterized in that: A shock absorbing spring (6) is arranged above the limit platform (41), and the upper and lower ends of the shock absorbing spring (6) respectively press and contact the fixed seat (1) and the limit platform (41), and under the elastic force of the shock absorbing spring (6), the bottom surface of the limit platform (41) is in contact with and pressed against the top surface of the plane bearing (7).

3. The suitcase caster according to claim 1, characterized in that: The top of the vertical shaft (4) passes through the fixing seat (1) and is then turned outward and riveted to the top surface of the fixing seat (1) or welded to the top surface of the fixing seat (1) or connected to the top surface of the fixing seat (1) via a connecting piece (8).

4. The suitcase caster according to claim 1, characterized in that: The bottom surface of the vertical shaft (4) is provided with an annular groove (42), and a positioning pin is transversely arranged in the wheel seat (2). After passing through the annular groove (42), the positioning pin is fixed in the wheel seat (2) and axially limits the vertical shaft (4).

5. The suitcase caster according to claim 1, characterized in that: The plane bearing (7) is a plane needle roller bearing or a plane ball bearing.

6. The suitcase caster according to claim 1, characterized in that: Rollers (3) are hingedly connected to the left and right sides of the wheel seat (2).

7. The suitcase caster according to claim 6, characterized in that: The roller (3) is provided with a second installation cavity (9), and a common bearing is installed in the second installation cavity (9), so that the roller (3) can roll smoothly when the suitcase is loaded.

8. The suitcase caster according to claim 2, characterized in that: The shock absorbing spring (6) is a spiral spring or a disc spring.

9. The suitcase caster according to claim 8, characterized in that: The disc springs can be multiple and vertically stacked.

10. The suitcase caster according to claim 4, characterized in that: The roller (3) is provided with a through hole communicating with the annular groove (42).

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