Patent Application
20250185772
The present invention relates to the technical field of pull-rod luggage case, and more particularly relates to a frame for a pull-rod luggage case.
In the prior art, a pull-rod luggage case is usually equipped with a pair of telescopic metal pull rods which are usually positioned at a back side of the pull-rod luggage case with lower ends thereof positioned inside a shell of the pull-rod luggage case and fixed with pull rod fixtures provided inside the shell of the pull-rod luggage case. Portions of the pull rods positioned inside the shell of the pull-rod luggage case as well as the pull rod fixtures are usually concealed by using a piece of cloth.
The problem of the above mentioned prior art is that the pull rods are fixed with the shell of the pull-rod luggage case merely through the corresponding pull rod fixtures, meaning that a considerable strength of connection is only provided at the lower ends of the pull rods. When a longitudinal pulling force is applied to the pull rods (for example, when the user grab a handle connecting the pull rods and then lift the luggage case vertically), connection between the pull rods and the corresponding pull rod fixtures may be easily damaged; further, if more and heavier objects are placed inside the luggage case, the pull rods may be easily compressed and deformed, and the telescopic function of the luggage case can therefore be affected.
It is an object of the present invention to provide a frame for a pull-rod luggage case to reinforce the overall structural strength of the pull-rod luggage case.
To attain the above object, the present invention provides the following technical solutions:
A frame for a pull-rod luggage case, comprising a pair of pull rods parallel to each other, a pair of castor seats, an upper beam, a lower beam, and a handle;
The frame also comprise the shell; each of the pair of castor seats comprises an outer seat and an inner seat; each outer seat defines outer surfaces of the shell at a corner of the shell between a back surface, a bottom surface and a corresponding side surface of the shell; the inner seat is positioned inside the shell and being fixedly connected with a corresponding outer seat; the lower beam is positioned inside the shell, and each of the two ends of the lower beam is fixedly connected with one side of a corresponding inner seat; the upper beam comprises an outer beam and an inner beam; the outer beam is positioned at an edge between the back surface and a top surface of the shell; each of the two ends of the outer beam sleeves the upper circumferential surface of a corresponding outer rod; the inner beam is positioned inside the shell, and is also fixedly connected with the outer beam.
Preferably, the top surface of the shell is provided with a first recess, and the bottom surface of the shell is provided with two second recesses; the first recess accommodates the outer beam; each of the two second recesses accommodates a corresponding outer seat.
All outer rods and inner rods are made by carbon fibers.
Preferably, outer surfaces of the outer rods and the inner rods are each coated with nano UV coating.
Each of the pair of pull rods has an L-shape cross section. Alternatively, the outer rods and the inner rods are elliptical cylinders.
According to the technical solutions provided above, the present invention has the following technical effects:
1) The present invention simplifies and optimizes the structures of the pull-rod luggage case, wherein the pull rods, the upper beam and the lower beam are integrated as a skeleton which can be fixed and mounted to peripheries of the shell of the pull-rod luggage case so as to reinforce the structural strength of the shell and the pull rods, and thus the overall structural strength of the pull-rod luggage case. The skeleton can also be fitted at the peripheries including the corners of the shell, thereby preventing excessive occupation of the internal space of the shell and hence increasing the utility of the storage space inside the pull-rod luggage case.
2) Also, the present invention uses less components compared with conventional pull-rod luggage cases, thereby allowing lower costs and easier assembly.
3) Further, the upper beam, the lower beam and the handle are three transverse beams across the width of the pull-rod luggage case, wherein the upper beam and the lower beam limit a width between the outer rods, and the handle limits a width between the inner rods; accordingly, the pair of pull rods are ensured to be parallel to each other, thereby ensuring the structural strength and stability of the pull rods.
In order to further explain the technical solutions of the present invention, the present invention will be described in detail below with reference to some embodiments.
With reference to
By using the above technical solutions, the present invention simplifies and optimizes the structures of the pull-rod luggage case, wherein the pull rods 1, the upper beam 3 and the lower beam 4 are integrated as a skeleton A which can be fixed and mounted to peripheries of the shell 7 of the pull-rod luggage case so as to reinforce the structural strength of the shell 7 and the pull rods 1, and thus the overall structural strength of the pull-rod luggage case. The skeleton A can also be fitted at the peripheries including the corners of the shell 7, thereby preventing excessive occupation of the internal space of the shell 7 and hence increasing the utility of the storage space inside the pull-rod luggage case. Also, the present invention uses less components compared with conventional pull-rod luggage cases, thereby allowing lower costs and easier assembly. Further, the upper beam 3, the lower beam 4 and the handle 5 are three transverse beams across the width of the pull-rod luggage case, wherein the upper beam 3 and the lower beam 4 limit a width between the outer rods 11, and the handle 5 limits a width between the inner rods 12; accordingly, the pair of pull rods 1 are ensured to be parallel to each other, thereby ensuring the structural strength and stability of the pull rods 1.
With reference to
According to the first embodiment, each of the pair of pull rods 1 has an L-shape cross section; accordingly, each of the pull rods 1 extends to two different directions when being fixed to inner side walls and inner bottom wall of the shell 7, so that the pull rods 1 can be as close as possible to inner walls of the shell 7 and occupy as less as possible an internal storage space of the shell 7 in order to increase the utility of the internal storage space of the pull-rod luggage case.
Each of the pair of castor seats 2 comprises an outer seat 21 and an inner seat 22; each outer seat 21 defines outer surfaces at a corner of the shell 7 between a back surface, a bottom surface and a corresponding side surface of the shell 7; the inner seat 22 is positioned inside the shell 7 and being fixedly connected with a corresponding outer seat 21; the lower beam 4 is positioned inside the shell 7, and each of the two ends of the lower beam 4 is fixedly connected with one side of a corresponding inner seat 22; the upper beam 3 comprises an outer beam 31 and an inner beam 32; the outer beam 31 is positioned at an edge between the back surface and a top surface of the shell 7; each of the two ends of the outer beam 31 sleeves the upper circumferential surface of a corresponding outer rod 11; the inner beam 32 is positioned inside the shell 7, and is also fixedly connected with the outer beam 31. In this embodiment, the components mentioned above are connected through screws so as to achieve removable connection.
Further, the top surface of the shell 7 is provided with a first recess 71, and the bottom surface of the shell 7 is provided with two second recesses 72; the first recess 71 accommodates the outer beam 31; each of the two second recesses 72 accommodates a corresponding outer seat 21; accordingly, the upper beam 3 and the pair of castor seats 2 will flush with an outer contour of the shell 7 to obtain a more appealing outer appearance and avoid user from bumping against the upper beam 3 and/or the pair of castor seats 2.
All outer rods 11 and inner rods 12 are made by carbon fibers. Compared with metal alloys which are conventionally used, carbon fibers have lighter weights and higher strength.
Further, outer surfaces of the outer rods 11 and the inner rods 12 are each coated with high-hardness, highly wear-resistant nano UV coating 13. Under protection by the nano UV coating 13, outer surfaces of the rods of the pair of pull rods 1 are equipped with wear-resistant protection, effectively preventing surface damage or scratches, meeting the user's requirements, and solving the existing problems of poor wear resistance of conventional pull rod surfaces, which are susceptible to abrasion which may lead to surface damage or scratches due to repeated times of extension and retraction.
With reference to
The second embodiment is different from the first embodiment mainly in the cross sections of the pair of pull rods 1. According to the second embodiment, each of the pair of pull rods 1 has a narrow and elongated cross sectional shape, for example an elliptical shape or a leaf shape. In other words, the outer rods and the inner rods are elliptical cylinders which are thinner but wider. As such, when user holds the handle 5 to push or pull the pull-rod luggage case, the contact areas between the pair of pull rods 1 with the shell 7 are larger, and thus the luggage case is more reactive to force so that user can more easily move the pull-rod luggage case.
The embodiments and drawings are not intended to limit the form and types of the present invention. Any appropriate changes or modifications made by a person skilled in this field of art should be considered falling within the scope of patent of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202323353016.4 | Dec 2023 | CN | national |
