Highly reliable rolling suitcase having separate force-bearing structure

Abstract

A highly reliable rolling suitcase having a separate force-bearing structure, comprising a support frame (1) and a suitcase body (2) embedded and installed within the support frame (1). Pull rod, handle, and caster components which are mainly used for force bearing and the suitcase body (2) which is mainly used for carrying items are divided into two relatively independent structures, so that force-bearing transmission between the pull rod, handle, and caster components does not need to be achieved through the suitcase body (2), thereby greatly reducing extreme stress on the suitcase body (2) of the rolling suitcase and effectively prolonging the service life of the rolling suitcase. This configuration also avoids occupying the internal space of the suitcase body (2), helping to increase the internal storage utilization of the suitcase body (2).

Description

A high-reliability trolley case with a split load-bearing structure Technical Field

[0001] The present invention relates to the technical field of travel tools, suitcases and trolley cases, and in particular to a high-reliability trolley case with a split load-bearing structure. Background Art

[0002] Boxes are traditional household items. Originally wooden, then leather, and now made from Oxford cloth, injection-molded plastic, or stamped from sheet metal or aluminum. About 50 years ago, boxes were fitted with wheels and pulled with belts. In 1991, Adèle Fendi added a trolley to a box, creating the common trolley case structure of today.

[0003] The main load-bearing functional components of trolley cases produced by existing technology, such as the draw rod, handle, and caster, are usually manually installed and fixed on the corresponding parts of the case. The draw rod, handle, and caster are independent and not connected to each other. They need to be fixed on the case and rely on the case to transmit the force to achieve control of the case. The mainstream case materials today are injection-molded cases such as ABS and PC, and stamped cases made of thinner metal materials. The case is very thin and brittle and cannot withstand high-frequency and high-intensity stretching. It also violates the basic principles of structural mechanics and is easily deformed and broken, resulting in a short service life of the trolley case.

[0004] On the other hand, the existing draw rod structure is made of metal pipes. In order to ensure that the shape of the draw rod box is complete and there are no obvious protrusions on the surface, the two draw rods of the draw rod box and the upper support, lower support, and inner cover of the fixed draw rod are all arranged inside the box, occupying a large space inside the box, especially causing a large protrusion on the internal plane of the box, affecting the flatness of the interior of the box, and resulting in restrictions on the placement of items in the box.

[0005] Summary of the Invention

[0006] To address the deficiencies of the prior art, the present invention proposes a highly reliable trolley case with a split load-bearing structure, utilizing modern structural mechanics specifications to control the entire process of trolley case design and production. This trolley case is composed of a load-bearing frame and a case body, and is produced using an intelligent, automated production line. The three brackets, namely the drawbar, handle, and caster, are integrated into a single unit to form a simple and sturdy load-bearing frame. The case body is then embedded into the load-bearing frame and simply fixed to complete the production of the trolley case. This eliminates the need for load-bearing transmission between the drawbar, handle, and caster components through the case body, eliminating extreme stress conditions on the case body and effectively extending the service life of the trolley case. This also avoids encroaching on the internal space of the case body, helping to improve the utilization rate of the storage space within the case body.

[0007] To achieve the above objectives, the technical solutions adopted by the present invention include:

[0008] A high-reliability trolley case with a split load-bearing structure, characterized by comprising a load-bearing frame and a case body embedded in the load-bearing frame;

[0009] The supporting frame at least comprises a tie rod support and a top support and a bottom support respectively fixedly connected to both ends of the tie rod support, wherein the top support, the tie rod support and the bottom support are combined to form a mounting position corresponding to the outer dimensions of the box;

[0010] The box body is embedded in the installation position and fixedly connected to the supporting frame, and the box body includes a box cover that can be freely opened / closed relative to the supporting frame;

[0011] The pull rod bracket is fixedly mounted with a telescopic pull rod;

[0012] The top bracket is fixedly mounted with a top handle;

[0013] Casters are fixedly mounted on the four corners of the bottom bracket.

[0014] Furthermore, the bottom bracket is also equipped with a support member and a first limit member and a second limit member that match the support member; if the box is slightly tilted, when the toe steps on the support member, the support member will move to the first working position of the first limit member and become a brake button; if the box is slightly tilted, when the toe hooks the support member, the support member will move to the second working position of the second limit member and become a handle.

[0015] When the support member stops at the first working position, the support member is perpendicular to the bottom bracket and is higher than the casters and contacts the ground, so that the two casters relatively close to the support member are lifted off the ground and suspended in the air;

[0016] When the vehicle stops at the second working position, the support member is parallel to the bottom bracket and is lower than the casters, so that all four casters are in contact with the ground.

[0017] Furthermore, when the support member reaches the second working position of the second limiting member, it becomes a bottom handle of the box body, and the bottom handle slightly protrudes from the box body and the supporting frame.

[0018] Furthermore, the surface of the support member in contact with the ground is covered with an anti-slip layer.

[0019] Furthermore, the first limiting member and the second limiting member include ball buckles or magnetic buckles.

[0020] Furthermore, the reinforcement bracket is also fixedly provided with a side handle.

[0021] Furthermore, the supporting frame is made of aluminum alloy rectangular tubes. The height of the rectangular tubes is determined by the size of the box, and the width is uniformly 15 mm. A 15 mm deep groove is cut outward in the bottom of the box according to the specifications of the tie rod bracket. During assembly, the groove is inset into the 15 mm wide tie rod bracket, aligning the bottom of the box with the tie rod bracket, forming the bottom pad of the trolley case. This ensures a smooth, sturdy, beautiful, and elegant appearance inside and out.

[0022] Furthermore, the existing situation where the handle length is 15 cm and the width of the suitcase is abandoned, and the handle length is configured in a ratio of 0.618 of the suitcase width. This makes the handle's control over the suitcase stronger and more uniform, eliminating the phenomenon of the suitcase flipping while walking.

[0023] Furthermore, the telescopic rod is fixed in the rod bracket and will not be twisted or deformed when used. The telescopic rod can be equipped with a 5 mm diameter lock hole at a distance of 30 mm on the inside of the rod bracket, so that the telescopic rod can be started, raised, lowered, locked, and stopped at any position, which greatly facilitates travel life.

[0024] The beneficial effects of the present invention are:

[0025] The high-reliability trolley case with a split load-bearing structure described in the present invention has a load-bearing frame formed by a top bracket, a pull rod bracket and a bottom bracket, which provides an installation position corresponding to the box body and protects the box body and strengthens its structure. The pull rod, handle and caster components mainly used for bearing load and the box body mainly used for carrying items are divided into two relatively independent structures, so that the load-bearing transmission connection between the pull rod, handle and caster components does not need to be realized through the box body, which greatly reduces the extreme stress conditions of the trolley case body, can effectively extend the service life of the trolley case, and eliminates the need for additional reinforcement components of the trolley case, thereby reducing the weight of the trolley case.

[0026] The bottom bracket is also equipped with a support member and a first limit member and a second limit member that match the support member. If the box is slightly tilted and the toe steps on the support member, the support member will move to the first working position of the first limit member and become a brake button; if the box is slightly tilted and the toe hooks the support member, the support member will move to the second working position of the second limit member and become a bottom handle.

[0027] Create a 15mm-deep groove on the bottom of the case, according to the specifications of the tie rod bracket. During assembly, fit the groove into the 15mm-wide tie rod bracket, aligning the bottom of the case with the tie rod bracket, creating a flat bottom plate for the suitcase. This creates a smooth, sturdy, beautiful, and elegant interior and exterior. It also avoids encroaching on the interior space, helping to maximize storage space.

[0028] The length of the trolley handle is configured according to the golden ratio of 0.618 of the box width, so that the trolley handle has a greater and more uniform control over the box, eliminating the phenomenon of the trolley case flipping over while walking.

[0029] The telescopic rod is fixed in the rod bracket and is not prone to twisting and deformation. The telescopic rod with a diameter of 5 mm can be set at a distance of 30 mm on the inside of the rod bracket. The available lock hole gears can be set to achieve a telescopic rod with no gears and sections. It can be started, raised, lowered, locked, and stopped at any position, which greatly facilitates travel life.

[0030] For the relatively mature box production process, only simple adjustments to the design of the present invention are needed to meet production needs, which is low-cost and more suitable for automated and assembly-line production methods, helping to reduce production costs and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a side view schematically showing a first preferred embodiment of a high-reliability trolley case with a split load-bearing structure according to the present invention.

[0032] FIG2 is a schematic rear view of the load-bearing frame according to the first preferred embodiment of the present invention.

[0033] FIG3 is a side view schematically showing a first working position of a second preferred embodiment of the present invention.

[0034] FIG4 is a side view schematically showing a second working position of a second preferred embodiment of the present invention.

[0035] FIG5 is a schematic rear view of a load-bearing frame according to a third preferred embodiment of the present invention.

[0036] Explanation of the accompanying figures: 1-load-bearing frame, 11-pull rod bracket, 111-telescopic pull rod, 12-top bracket, 121-top handle, 13-bottom bracket, 131-castor, 132-support member, 133-first limit member, 134-second limit member, 135-bottom handle, 136-anti-slip layer, 14-installation position, 15-reinforcement bracket, 151-side handle, 2-box body, 21-box cover. DETAILED DESCRIPTION

[0037] In order to more clearly understand the content of the present invention, it will be described in detail with reference to the accompanying drawings and embodiments.

[0038] As shown in Figure 1, there is a schematic structural diagram of the first preferred embodiment of a high-reliability trolley case with a split load-bearing structure according to the present invention, which includes a load-bearing frame 1 and a case body 2 that are independent of each other and assembled together to form the entire trolley case. The case body 2 can be injection-molded using ABS, PC, or stamped into a box using a metal sheet. However, unlike existing trolley cases that use the case body 2 itself as the main structure to resist forces (such as the impact force generated by carrying or dragging), the case body 2 of the preferred embodiment is mainly used to accommodate items, while the relatively independent load-bearing frame 1 is responsible for resisting most of the impact force.

[0039] As shown in Figure 2, it is a schematic diagram of the structure of the load-bearing frame 1 in the first preferred embodiment, which mainly includes a drawbar bracket 11, a top bracket 12 and a bottom bracket 13, which are fixedly connected to form a mounting position 14 corresponding to the box body 2, and protect the box body 2 and strengthen its structure. Specifically, the drawbar bracket 11 corresponds to the back side of the box body 2 (relative to the front side of the box cover 21 opening), and is provided with a telescopic drawbar 111 for realizing the dragging function of the drawbar case. The handle length of the telescopic drawbar 111 is set to a ratio of 0.618 to the width of the box body 2, thereby increasing and balancing the bearing capacity and control force of the telescopic drawbar 111 on the box body 2; the top bracket 12 corresponds to the top side of the box body 2, and is fixedly provided with a top handle 121 for realizing the carrying function of the drawbar case; the bottom bracket 13 corresponds to the bottom side of the box body 2, and casters 131 are respectively installed at the four corners for realizing the moving function of the drawbar case. That is, in the main force-bearing scenarios corresponding to the trolley case, the load-bearing frame 1 is mainly responsible for bearing most of the forces, and each specific load-bearing component (telescopic pull rod 111, top handle 121, caster 131) is not directly connected to the box body 2. The forces generated during use are first applied to the load-bearing frame 1, and then the gravity of the box body 2 is evenly borne through the larger contact area between the load-bearing frame 1 and the box body 2, which is of great help in improving the service life of the box body 2. Preferably, the load-bearing frame 1 is made of metal, and is particularly preferably made of metal rectangular tubes, such as steel or aluminum alloy profiles with good mechanical properties, so as to improve the impact resistance of the trolley case. The draw rod bracket in the load-bearing frame 1 is formed into a rectangular plane body, and according to the specifications of the draw rod bracket, a groove 15 mm deep is made outward at the bottom of the box body. During assembly, the groove at the bottom of the box body is embedded in the 15 mm wide draw rod bracket, so that the bottom of the box body and the draw rod bracket are in the same plane, forming a bottom pad of the trolley case. Preferably, the telescopic rod 111 is connected to the rod bracket of the supporting frame 1, so that the telescopic rod 111 is not easily twisted or deformed when used in the rod bracket. This increases the available lock hole positions of the telescopic rod 111, making the telescopic rod 111 seamless and able to be started, raised, lowered, locked, and stopped at any position. Compared to the existing technology (which usually has only two or three available fixed locking positions), this technology can provide a wider range of preset lengths for the telescopic rod 111, greatly facilitating travel life.

[0040] In the first preferred embodiment, mounting position 14 of the supporting frame 1 forms a semi-enclosed structure corresponding to the box body 2. The top bracket 12 is actually the upper load-bearing frame of the box body 2, and the bottom bracket 13 is actually the lower chassis of the box body 2. Once the box body 2 is inserted into the mounting position 14, it can be fixed to the supporting frame 1 at various locations using methods such as bolts and adhesives to form a complete suitcase. Typical usage conditions include the following:

[0041] A1. When the suitcase is placed upright after being filled with items, casters 131 contact the ground to support the suitcase. Gravity naturally exerts a downward force on the suitcase body 2 and its contents. This force is primarily applied to the bottom bracket 13 and transmitted through the bottom bracket 13 to the casters 131. In this state, compared to conventional suitcases, where the force is borne by the suitcase body 2 and transmitted to the casters 131 through the four corners, the force in the preferred embodiment is transmitted through the bottom bracket 13, significantly reducing the force borne by specific parts of the suitcase body 2.

[0042] A2. After the suitcase is filled with items, it is placed upright. The top handle 121 is used to pull the entire suitcase up, so that all casters 131 are off the ground. At this time, the case 2 and its contents naturally exert a vertical downward force under the action of gravity. At the same time, the top handle 121 exerts an upward force on the suitcase. This force is mainly applied to the top bracket 12, and is simultaneously transmitted through the rod bracket 11 to be shared by the bottom bracket 13, and ultimately acts on the top handle 121. In this state, the force is first applied to the supporting frame 1 through the top handle 121, and then more evenly distributed to the case 2 through the supporting frame 1. Compared with the conventional suitcase, in which the force is directly borne by the top surface of the case 2 connected to the top handle 121, the force in the preferred embodiment is transmitted through the supporting frame 1 as a whole, reducing the force exerted on specific parts of the case 2.

[0043] A3. After the suitcase is loaded with items, it is dragged by the telescopic rod 111. The two casters 131 on one side of the telescopic rod 111 contact the ground, while the two casters 131 on the opposite side break away from the ground. At this point, the suitcase 2 and its contents naturally exert a vertical downward force under the action of gravity. At the same time, the telescopic rod 111 exerts a combined upward and forward force on the suitcase. This force is primarily applied to the rod bracket 11, and is simultaneously transmitted through the rod bracket 11 to be shared by the top bracket 12 and the bottom bracket 13, and ultimately acts on the telescopic rod 111. In this state, the force is first applied to the rod bracket 11 by the telescopic rod 111, and then more evenly distributed to the suitcase 2 via the supporting frame 1. Compared to the conventional suitcase, which requires the back of the suitcase 2 to directly connect to the telescopic rod 111 to bear the force, the force in the preferred embodiment is transmitted through the supporting frame 1 as a whole, significantly reducing the force exerted on specific parts of the suitcase 2.

[0044] As shown in Figures 3 and 4, a second preferred embodiment of the present invention is shown. Different from the first preferred embodiment, the second preferred embodiment further preferably has an additional support member 132 and a first limit member 133 and a second limit member 134 for limiting the swing displacement position of the support member 132 on the bottom bracket 13. Among them, the support member 132 is swingably connected to the edge position of the bottom bracket 13 (for example, the edge position corresponding to the side of the connecting rod bracket 11) through a rotating shaft; when the support member 132 swings to contact the first limit member 133, it is restricted to stay in the first working position (as shown in Figure 3) by the first limit member 133. At this time, the support member 132 is perpendicular to the bottom bracket 13, and the support member 132 protrudes from the caster 131 to contact the ground, so that the two casters 131 relatively close to the support member 132 are suspended from the ground; when the support member 132 swings to contact the second limit member 134, it is restricted to stay in the second working position (as shown in Figure 4) by the second limit member 134. At this time, the support member 132 is parallel to the bottom bracket 13, and the support member 132 does not protrude from the caster 131, so that all four casters 131 are in contact with the ground. Preferably, the support member 132 can be configured as a hollow structure for hand-carrying operation, forming a bottom handle 135. When the suitcase needs to be lifted, the top handle 121 and the bottom handle 135 can be used simultaneously, while still maintaining the structure in which the force is transmitted by the supporting frame 1, and making it easier to operate. Preferably, the first limiting member 133 and the second limiting member 134 can be selected as functional components such as ball buckles or magnetic buckles that can be operated to release the limiting state. Preferably, the surface of the support member 132 in contact with the ground is covered with an anti-slip layer 136, such as an anti-slip rubber layer, to increase the friction between the support member 132 and the ground and prevent the suitcase from sliding accidentally.

[0045] The high-reliability trolley case of the present invention has a regular internal space of the box body 2 without any encroachment by the trolleys. At the same time, the box body 2 does not need to be specially reinforced at the corresponding force-bearing positions, thereby reducing the manufacturing cost of the box body 2. The supporting frame 1 has strong impact resistance and can effectively disperse the force, protecting the box body 2 from being impacted by excessive force. At the same time, the supporting frame 1 and the box body 2 are independently manufactured and then assembled into shape, which is conducive to automated industrial production, reduces manual production steps, and helps to improve production efficiency.

[0046] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A high-reliability trolley case with a split load-bearing structure, characterized in that: It includes a load-bearing frame and a box body embedded and installed in the load-bearing frame; The bearing frame at least comprises a tie rod support and a top support and a bottom support respectively fixedly connected to both ends of the tie rod support, wherein the top support, the tie rod support and the bottom support are combined to form a mounting position corresponding to the outer dimensions of the box body; The box body is embedded in the installation position and fixedly connected to the supporting frame, and the box body includes a box cover that can be freely opened / closed relative to the supporting frame; The pull rod bracket is fixedly mounted with a telescopic pull rod; The top bracket is fixedly mounted with a top handle; Casters are fixedly mounted on the four corners of the bottom bracket.

2. The high reliability suitcase as claimed in claim 1, characterized in that: The bottom bracket is also equipped with a support member and a first limiting member and a second limiting member matching the support member; The support member swings relative to the bottom bracket, contacts the first limit member and is limited to stay at the first working position by the first limit member, or contacts the second limit member and is limited to stay at the second working position by the second limit member; When the support member stops at the first working position, the support member is perpendicular to the bottom bracket, and the support member protrudes from the caster wheel and contacts the ground, so that the two casters relatively close to the support member are off the ground and suspended in the air; When stopped at the second working position, the support member is parallel to the bottom bracket, and the support member does not protrude from the casters, so that the four casters are all in contact with the ground.

3. The high reliability suitcase as claimed in claim 2, characterized in that: The support member also includes a bottom handle of a hollow structure; When the support member stops at the second working position, the bottom handle of the support member protrudes from the box body and the supporting frame.

4. The high reliability suitcase as claimed in claim 2, characterized in that: The surface of the support member in contact with the ground is covered with an anti-slip layer.

5. The high reliability suitcase as claimed in claim 2, characterized in that: The first limiting member and the second limiting member include ball buckles or magnetic buckles.

6. The high reliability suitcase as claimed in claim 1, characterized in that: The load-bearing frame further comprises one or more reinforcing brackets, wherein the reinforcing brackets are fixedly connected to the top bracket and the bottom bracket, and the reinforcing brackets are in contact with or not in contact with the box body.

7. The high reliability suitcase as claimed in claim 6, characterized in that: The reinforcement bracket is also fixedly provided with a side handle.

8. The high reliability suitcase as claimed in claim 1, characterized in that: The bearing frame is made of metal rectangular pipe.

9. The high reliability suitcase as claimed in claim 1, characterized in that: The ratio of the handle length of the telescopic pull rod to the width of the box body is 0.618.

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