Mold closing nail and luggage trundle using same

Abstract

The utility model relates to the field of hardware, in particular to a die assembly nail which comprises a positioning end, a limiting disc, a vertical shaft and a riveting flange, the positioning end, the limiting disc, the vertical shaft and the riveting flange are fixedly connected in sequence and are all integrally formed, and the positioning end is arranged in a regular hexagon shape. Compared with an approximately-circular mounting end of a traditional mold closing nail, the mold closing nail with the orthohexagonal positioning end has a larger abutting area, and the situation that the mold closing nail is stressed to rotate in a connected workpiece and even slides and loosens is reduced.

Description

Technical Field

[0001] This application relates to the field of hardware products, and in particular to a mold-fitting nail and a bag caster using the mold-fitting nail. Background Technology

[0002] Mold fittings, as a traditional hardware component, are typically used for the casters of luggage and similar bags.

[0003] In related technologies, the mold-fitting nail includes a nearly circular mounting end and a nail body. It mainly achieves a stable connection between the wheel body and the housing by rigidly connecting the mounting end inside the mounting groove of the wheel frame.

[0004] The existing mold-fitting nails have the following problems: after installation, the nearly round head of the mold-fitting nail is prone to rotating in the wheel frame of luggage or similar bags and can easily fall off under stress. Summary of the Invention

[0005] In order to reduce the occurrence of slippage and loosening of the mold clamping pin in the connected workpieces, this application provides a mold clamping pin and a bag caster using the mold clamping pin.

[0006] The technical solution provided in this application for a mold-fitting nail and a bag caster using the mold-fitting nail is as follows:

[0007] A mold clamping pin includes: a positioning end, a limiting plate, a vertical shaft, and a riveting flange. The positioning end, the limiting plate, the vertical shaft, and the riveting flange are sequentially fixedly connected. The positioning end has a polygonal structure. After the mold clamping pin is locked, the positioning end is built into the mounting groove of the wheel frame, and each side wall of the positioning end abuts against the inner wall of the mounting groove.

[0008] By adopting the above solution, after the mold clamping nail is locked, the positioning end is built into the mounting groove of the wheel frame. The multi-sided sidewalls of the positioning end abut against the inner wall of the mounting groove. By increasing the contact area between the positioning end and the mounting groove, the occurrence of mold clamping nail rotating under force or even sliding and loosening is reduced.

[0009] Preferably, the positioning end is located at the top of the vertical shaft, and the upper surface of the positioning end is provided with a cross groove, the walls of which are all rounded.

[0010] By adopting the above scheme, the positioning end forms a mechanical interlocking structure, which increases the matching degree between the positioning end and the inner wall of the mounting groove, further enhancing the anti-slip performance of the positioning end. The cross groove can also play a role in dispersing stress during the installation process.

[0011] Preferably, the limiting disk is disposed in the area of ​​the vertical axis in the middle, close to the positioning end, and the limiting disk is in the shape of a perfect circle, the diameter of the limiting disk being larger than the diameter of the positioning end.

[0012] By adopting the above solution, the limiting plate limits the pressing depth of the mold clamping pin by making hard contact with the edge of the mounting groove of the wheel frame, thereby reducing the occurrence of excessive embedding of the mold clamping pin and resulting in a decrease in connection strength.

[0013] Preferably, the riveting flange is located at the bottom of the vertical shaft, and the riveting flange is shaped like a frustum.

[0014] By adopting the above scheme, the pressure in the vertical direction is decomposed, and most of the force is applied to the riveting flange, while a small amount of force produces axial deformation, thus reducing the occurrence of excessive stress and deformation of the mold clamping nail.

[0015] Preferably, the connection points of the positioning end, the limiting plate, the riveting flange, and the vertical shaft are all provided with arc-shaped transition surfaces.

[0016] By adopting the above scheme, the arc-shaped transition surface transmits the lateral impact force to the vertical axis along the tangential direction, reducing the sudden change in stress at the connection point, which could lead to the mold clamping nail breaking and falling off the wheel frame. The multiple arc surfaces work together to bear the force, improving the overall stiffness and elastic recovery ability of the mold clamping nail.

[0017] Preferably, a bag caster includes the aforementioned mold-fitting nail, characterized in that it further includes a first wheel frame, a second wheel frame, and a roller, wherein the first wheel frame is provided with a mounting groove, the positioning end is built into the mounting groove, one end of the vertical shaft is fixedly connected to the mounting groove, the second wheel frame is provided with a connecting hole, and the other end of the vertical shaft is interference-fitted with the connecting hole.

[0018] By adopting the above solution, the first wheel frame and the second wheel frame are tightly connected by mold-fitting nails, which improves the mechanical strength and structural stability of the luggage casters.

[0019] Preferably, the opening edge of the connecting hole is provided with a guide surface.

[0020] By adopting the above scheme, the guide surface and the other end of the vertical axis form a progressive contact. In the initial stage of installation and fitting, the coaxiality deviation is automatically corrected by the curved surface sliding, so that the mold closing nail can achieve axial positioning.

[0021] Preferably, 2 / 5 of the vertical shaft is connected to the first wheel frame, and 3 / 5 of the vertical shaft is connected to the second wheel frame.

[0022] By adopting the above solution and adjusting the length required for different mating methods at each end of the mold clamping nail, the impact resistance and durability of the mold clamping nail can be balanced simultaneously.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. It reduces the occurrence of mold clamping pins rotating under stress or even sliding and loosening in the connected workpieces;

[0025] 2. Improved the load-bearing capacity and durability of the mold clamping nails;

[0026] 3. Improved the connection strength and stability of luggage casters. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a mold-closing nail in Embodiment 1 of this application.

[0028] Figure 2 This is a schematic diagram of the overall structure of a luggage caster in Embodiment 2 of this application.

[0029] Figure 3 This is a cross-sectional view of a bag caster according to Embodiment 2 of this application.

[0030] Figure 4 yes Figure 2 A cross-sectional view of the first wheel frame.

[0031] Figure 5 This is an exploded view of a luggage caster according to Embodiment 2 of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Positioning end; 11. Cross groove; 2. Limiting plate; 3. Vertical shaft; 4. Arc transition surface; 5. Riveted flange; 6. Roller; 7. First wheel frame; 71. Mounting groove; 8. Second wheel frame; 81. Connecting hole; 811. Guide surface; 82. Transverse fastener. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0034] In this embodiment, the mold-fitting nail is normally used on the casters of luggage such as suitcases. The top of the mold-fitting nail is connected and fixed to the first wheel frame 7 of the suitcase, and the bottom of the mold-fitting nail is fixedly connected to the second wheel frame 8 of the suitcase.

[0035] Example 1

[0036] This application discloses a mold-closing nail. (Refer to...) Figure 1A mold clamping nail includes a positioning end 1, a limiting plate 2, a vertical shaft 3, and a riveting flange 5. The positioning end 1 is integrally formed at one end of the vertical shaft 3, and the riveting flange 5 is integrally formed at the other end of the vertical shaft 3. The limiting plate 2 is integrally formed on the vertical outer wall and is located between the positioning end 1 and the riveting flange 5. In this embodiment, the positioning end 1 is arranged in the form of a regular hexahedron. After the mold clamping nail is locked, the positioning end 1 is built into the mounting groove 71 of the wheel frame of a suitcase or similar bag. Compared with the near-circular mounting end of the traditional mold clamping nail, because the circle has no fixed force point, the contact surface of the workpiece is prone to tangential sliding. However, the six side walls of the positioning end 1 all abut against the inner wall of the mounting groove 71. Each side acts as an independent force unit, forming multi-directional support when the mold clamping nail vibrates, making the stress distribution more uniform and reducing the occurrence of the mold clamping nail rotating under force or even sliding and loosening.

[0037] Furthermore, a cross groove 11 is provided on the upper surface of the positioning end 1, and the groove walls of the cross groove 11 are all rounded. Therefore, the positioning end 1 and the inner wall of the mounting groove 71 form a multi-faceted interlock, which increases the geometric matching degree between the positioning end 1 and the mounting groove 71, and indirectly enhances the anti-slip performance and stress resistance of the mold clamping nail.

[0038] In addition, the outer side wall of the limiting plate 2 abuts against the inner side wall of the mounting groove 71, forming a mechanical interlock structure with the positioning end 1. By limiting the pressing depth of the mold clamping pin, the situation where the mold clamping pin is over-embedded and the connection strength decreases is reduced.

[0039] Furthermore, the limiting plate 2 is in the shape of a perfect circle, and the diameter of the limiting plate 2 is larger than the diameter of the positioning end 1. The part of the edge of the limiting plate 2 that extends beyond the installation end forms a buffer zone, which converts the axial tensile force into radial shear force, reducing the occurrence of stress concentration that could lead to cracks in the mold clamping pin. The limiting plate 2 also slows down the gradual loosening of the mold clamping pin during vibration by increasing the friction contact area.

[0040] In addition, the riveted flange 5 is set in a frustum shape, which provides expansion space for the mold closing nail. This can reduce the mechanical damage to the mold closing nail caused by thermal expansion and contraction, and also reduce the strength of the fit with the wheel frame, indirectly improving the flexible rotation of the roller 6.

[0041] Furthermore, the riveting flange 5 can decompose the pressure in the vertical direction into radial expansion force and axial constraint force, and apply most of the force to the riveting flange 5, while using a small amount of force to generate axial deformation, thereby reducing the occurrence of excessive stress on the mold clamping pin.

[0042] Furthermore, the riveting flange 5, in conjunction with the limiting plate 2, achieves axial restriction of the mold closing nail. Moreover, if a reasonable tolerance range is uniformly applied to the riveting flange 5, the height consistency of multiple sets of luggage casters after installation can be improved.

[0043] Meanwhile, the connection points of the positioning end 1, the limiting plate 2, the riveting flange 5, and the vertical shaft 3 are all provided with arc-shaped transition surfaces 4. The arc-shaped transition surfaces 4 form a continuous gradient channel in the integrally formed mold cavity, reducing the dead zone of material flow. The arc-shaped transition surfaces 4 also change the contact between the mold closing pin and the mold cavity from sliding friction to rolling friction, making the demolding process more convenient.

[0044] Furthermore, the arc-shaped transition surface 4 can guide the lateral impact force to be transmitted along the tangent direction of the vertical axis 3, reducing stress accumulation at the connection point and preventing the mold clamping nail from suddenly breaking and falling off the wheel frame. At the same time, the multiple arc surfaces work together to bear the force, which improves the structural strength of the mold clamping nail and extends its service life.

[0045] Example 2

[0046] On the other hand, this application discloses a bag caster, referring to... Figure 2-5 The system includes a mold-fitting nail as described in Embodiment 1, as well as a first wheel frame 7, a second wheel frame 8, and a roller 6. The first wheel frame 7 has an installation groove 71. In this embodiment, the end of the vertical shaft 3 with the positioning end 1 is fixedly installed in the installation groove 71 by injection molding. The second wheel frame 8 is provided with a connecting hole 81. The end of the vertical shaft 3 with the riveted flange 5 is riveted to the connecting hole 81 to achieve an interference fit. In addition, a transverse fastener 82 is added to the bottom of the connecting hole 81. The transverse fastener 82 limits the riveted flange 5 by passing through the bottom of the connecting hole 81. The mold-fitting nail thus tightly connects the first wheel frame 7 and the second wheel frame 8, improving the mechanical strength and structural stability of the luggage caster.

[0047] Specifically, 2 / 5 of the vertical shaft 3 is fixed in the mounting groove 71 by injection molding, and 3 / 5 of the vertical shaft 3 is riveted to the connecting hole 81 to achieve an interference fit, which at the same time improves the impact resistance and durability of the mold clamping pin.

[0048] Furthermore, the opening edge of the connecting hole 81 is provided with a guide surface 811, which plays an axial guiding role during the installation of the mold clamping nail and the connecting hole 81. When the roller 6 turns, the lateral force generated is converted into the torque of the vertical shaft 3 through the arc-shaped guide surface 811. The arc-shaped sliding compensates for the elastic deformation and maintains the stability of the connection structure.

[0049] The implementation principle of a mold-locking nail in this embodiment is as follows: the head and tail ends of the mold-locking nail are fixedly connected to the two wheel frames of the luggage caster, respectively. After the mold-locking nail is locked, the hexagonal positioning end 1 of the mold-locking nail in this embodiment has a larger contact area than the nearly circular installation end of the traditional mold-locking nail. By increasing the contact area between the mold-locking nail and the wheel frame mounting groove 71, the occurrence of mold-locking nail rotation under force or even slippage and loosening is effectively reduced.

[0050] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A clamp pin characterized by, Including positioning end head (1), limiting disc (2), vertical shaft (3) and riveting and pressing flange (5), positioning end head (1), limiting disc (2) and vertical shaft (3) and riveting and pressing flange (5) are sequentially fixedly connected, positioning end head (1) is a polygonal structure, when the mold nail is locked and fixed, positioning end head (1) is built-in the mounting groove (71) of wheel frame, and the inner wall of the mounting groove (71) is abutted with each side wall of the positioning end head (1).

2. A die pin according to claim 1, wherein The positioning end head (1) is arranged at the top of the vertical shaft (3), and a cross groove (11) is arranged on the upper surface of the positioning end head (1), and the groove walls of the cross groove (11) are all treated by chamfering.

3. A clamp pin according to claim 2, wherein The limiting disc (2) is arranged at the region close to the positioning end head (1) in the vertical direction of the middle part of the vertical shaft (3), and the limiting disc (2) is a regular circular ring, and the diameter of the limiting disc (2) is greater than the diameter of the positioning end head (1).

4. A die pin according to claim 1 wherein, The riveting and pressing flange (5) is arranged at the bottom of the vertical shaft (3), and the riveting and pressing flange (5) is arranged in a circular truncated cone shape.

5. A die pin according to claim 1 wherein, The connecting portions of the positioning end head (1), the limiting disc (2) and the riveting and pressing flange (5) and the vertical shaft (3) are all provided with arc transition surfaces (4).

6. A luggage caster comprising a mold joint as claimed in any one of claims 1-5, characterized in that, Further comprising a first wheel frame (7), a second wheel frame (8) and a roller (6), the first wheel frame (7) is provided with a mounting groove (71), the positioning end head (1) is built-in the mounting groove (71), one end of the vertical shaft (3) is fixedly connected with the mounting groove (71), the second wheel frame (8) is provided with a connecting hole (81), and the other end of the vertical shaft (3) is interference-fitted with the connecting hole (81).

7. The luggage caster wheel of claim 6, wherein, The opening edge of the connecting hole (81) is provided with a guide surface (811).

8. The luggage caster wheel according to claim 6, wherein, 2 / 5 shaft sections of the vertical shaft (3) are connected with the first wheel frame (7), and 3 / 5 shaft sections of the vertical shaft (3) are connected with the second wheel frame (8).

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