Tandem lift gate trailer
The design of the main frame, subframe, self-balancing components, pulley components, and self-lubricating components solves the problems of inconvenient disassembly and assembly and unstable gliding of the gantry trailer, achieving convenient installation and smooth gliding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN NANHAI YIMAI HARDWARE PROD CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-21
AI Technical Summary
The existing gantry trailers with lifting linkages suffer from inconvenient disassembly and assembly, as well as poor pulley lubrication, leading to unstable sliding.
The design incorporates a main frame, subframe, self-balancing components, pulley components, self-lubricating components, and lifting components to facilitate easy assembly and disassembly of the trailer and provide self-lubrication. Sponge pads are used to lubricate the pulleys, ensuring smooth gliding.
It enables convenient installation and smooth gliding of the gantry trailer, improving the user experience.
Smart Images

Figure CN224532500U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of suspended sliding doors, specifically to suspended sliding door trailers. Background Technology
[0002] Aluminum alloy sliding doors are a type of door made of titanium-magnesium-aluminum alloy. They are trackless at the bottom and open and close by sliding through a top rail and rollers. Their structure relies on the upper rail suspension system to move left and right, and they are quiet, threshold-free, and aesthetically pleasing. Because the material incorporates titanium and magnesium elements, it has advantages such as low density, high strength, and corrosion resistance. It is mainly suitable for indoor partitioning scenarios, such as living rooms, kitchens, and bathrooms.
[0003] The suspended linkage door trailer is a structural component that connects the linkage door to the top hanging rail. It has been found that the existing suspended linkage door trailer has problems with inconvenience in disassembly and assembly, and it is also unable to perform automatic lubrication of the pulleys, resulting in trailer swaying and instability. Further improvements are needed.
[0004] Therefore, it is necessary to invent a crane-operated gantry trailer. Utility Model Content
[0005] Therefore, this utility model provides a gantry-mounted trolley with a lifting mechanism to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a suspended linkage door trailer for connecting a suspension rail and a linkage door frame, comprising a main frame and two sub-frames. The two sub-frames are detachably fixed to the main frame. Each of the two sub-frames is equipped with a pulley assembly via a self-balancing component. A self-lubricating component for lubricating the pulley assembly is also detachably installed on the self-balancing component. A lifting assembly is detachably installed at the bottom of the main frame. The main frame rolls within the suspension rail via the pulley assembly. The lifting assembly is fixed to the top of the linkage door frame.
[0007] Preferably, the upper and lower ends of the two subframes are fixed with connecting hooks, and the upper and lower ends of the two subframes are interlocked by the connecting hooks. The main frame has symmetrical screw holes on both sides of its bottom, and screws are threaded into the walls of the screw holes. The two subframes are fixed to the main frame by screws.
[0008] Preferably, the self-balancing assembly includes two balance plates, which are respectively located on one side of two subframes. Each balance plate has a connecting hole in its center, and each of the two subframes has a through hole in its center. The balance plates are rotatably mounted on the subframes by rivets, which pass through the connecting hole and the through hole.
[0009] Preferably, the pulley assembly includes four pulleys, which are rotatably mounted on both ends of the balance plate via pins, and roll inside the suspension rail.
[0010] Preferably, the self-lubricating component includes two oil boxes, each with a connecting buckle fixed to its inner side at the top and bottom, and the two oil boxes are respectively fastened to the outer side of the middle of the two balance plates through the connecting buckles.
[0011] Preferably, each oil box contains a sponge sheet, both ends of which extend out of the oil box and abut against the surfaces of two pulleys. Each oil box has an oil filling hole at the center of its top.
[0012] Preferably, the lifting assembly includes a screw hole, which is located at the bottom center of the main frame. A connecting screw is threaded to the wall of the screw hole, and a lifting block is threaded to the bottom end of the connecting screw. The lifting block is fixed to the inner side of the top of the linkage door frame.
[0013] The beneficial effects of this utility model are as follows: by using the main frame, sub-frame, self-balancing component, pulley component, self-lubricating component and lifting component together, it can not only slide the linkage door frame on the hanging rail, but also has the function of easy disassembly and assembly. In addition, the design of the self-balancing component and the matching oil box with sponge sheet to lubricate the pulley makes the trailer slide more smoothly, with better practicality and suitable for promotion. Attached Figure Description
[0014] Figure 1 This is a top-view perspective view of the structure of this utility model;
[0015] Figure 2 This is an exploded view of the structure from a top perspective provided by this utility model;
[0016] Figure 3 A three-dimensional view of the structure from a bottom angle provided for this utility model;
[0017] Figure 4 This is an exploded view of the structure from a bottom angle, provided for this utility model.
[0018] Figure 5 The diagram shows the effect of using this utility model.
[0019] In the diagram: 1. Hanging rail; 2. Linkage door frame; 3. Main frame; 4. Subframe; 5. Connecting hook; 6. Screw hole; 7. Screw; 8. Balance plate; 9. Connecting hole; 10. Through hole; 11. Rivet; 13. Pulley; 14. Pin; 15. Oil box; 16. Connecting buckle; 17. Sponge sheet; 18. Oil injection hole; 19. Screw hole; 20. Connecting screw; 21. Hanging block. Detailed Implementation
[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0021] Please refer to the appendix. Figures 1-5 The present invention provides a suspended linkage door trailer for connecting a hanging rail 1 and a linkage door frame 2. It includes a main frame 3 and two auxiliary frames 4. The two auxiliary frames 4 are detachably fixed on the main frame 3. Each of the two auxiliary frames 4 is equipped with a pulley assembly through a self-balancing component. A self-lubricating component for lubricating the pulley assembly can also be detachably installed on the self-balancing component. A lifting assembly is detachably installed at the bottom of the main frame 3. The main frame 3 rolls in the hanging rail 1 through the pulley assembly. The lifting assembly is fixed to the top of the linkage door frame 2.
[0022] The upper and lower ends of the two subframes 4 are fixed with connecting hooks 5, and the upper and lower ends of the two subframes 4 are connected to each other through the connecting hooks 5. The bottom sides of the main frame 3 are symmetrically provided with screw holes 6, and the walls of the screw holes 6 are threaded with screws 7. The two subframes 4 are fixed to the main frame 3 through screws 7. Specifically, the operator only needs to control the installation and removal of screws 7 to control the installation and removal between the main frame 3 and the subframes 4. That is, the trailer is designed as a split structure that is easy to assemble.
[0023] The self-balancing assembly includes two balance plates 8, which are located on one side of the two subframes 4 respectively. Each balance plate 8 has a connecting hole 9 in the middle, and each subframe 4 has a through hole 10 in the middle. The balance plates 8 are rotatably mounted on the subframes 4 by rivets 11, which pass through the connecting hole 9 and the through hole 10. Specifically, the balance plates 8 can swing, so that the trailer can achieve self-balancing function by automatically swinging and adjusting during the gliding process. It should also be noted that the bottom side of the subframe 4 is designed with a protruding structure, which can limit the position of the balance plates 8.
[0024] The pulley assembly includes four pulleys 13, which are rotatably mounted on both ends of the balance plate 8 via pins 14. The four pulleys 13 roll inside the overhead rail 1, allowing the trailer to slide easily inside the overhead rail 1 under the rolling action of the four pulleys 13.
[0025] The self-lubricating component includes two oil boxes 15. Each oil box 15 has a connecting buckle 16 fixed to its inner side. The two oil boxes 15 are respectively fastened to the outer side of the middle of the two balance plates 8 through the connecting buckle 16, so that the oil boxes 15 are easy to install and remove. Each oil box 15 has a sponge sheet 17 fixed inside. Both ends of the sponge sheet 17 extend out of the oil box 15 and abut against the surface of the two pulleys 13. Each oil box 15 has an oil filling hole 18 at the middle of its top. Specifically, the operator can install the oil box 15 on the trailer through the connecting buckle 16, and then add lubricating oil through the oil filling hole 18. The lubricating oil is absorbed and spread by the sponge sheet 17, and is applied to the surface of the corresponding pulleys 13 through both ends of the sponge sheet 17, thereby achieving the self-lubricating function and making the trailer slide more smoothly.
[0026] The lifting assembly includes a screw hole 19, which is located at the bottom center of the main frame 3. A connecting screw 20 is threaded onto the wall of the screw hole 19, and a lifting block 21 is threaded onto the bottom end of the connecting screw 20. The lifting block 21 is fixed to the inner top of the linkage door frame 2. Specifically, under the action of the screw hole 19, the connecting screw 20, and the lifting block 21, the linkage door frame 2 can slide on the overhead rail 1 through the trailer, and is easy to install and remove.
[0027] The usage process of this utility model is as follows: First, install the two balance plates 8 onto the two subframes 4 using rivets 11. At this time, the pulleys 13 can swing up and down due to the action of the balance plates 8. Then, fasten the oil box 15 onto the balance plates 8 using connecting buckles 16. Next, add lubricating oil through the oil filling hole 18. The lubricating oil is absorbed and spread by the sponge 17, and then applied to the surface of the corresponding pulleys 13 through both ends of the sponge 17, thus achieving a self-lubricating function and making the trailer slide more smoothly. Then, the operator... Install the lifting block 21 in the profile groove at the top of the linkage door frame 2, and insert the two sub-frames 4 into different positions inside the hanging rail 1. Then slide the two sub-frames 4 together, so that the two sub-frames 4 form a hollow state in the middle. Then insert the main frame 3 into the inside of the hanging rail 1, and move one end of the main frame 3 into the middle of the two sub-frames 4 and tighten it with screws 7. Then connect the main frame 3 to the lifting block 21 through the Lina screw 20. After the product is installed, reverse the operation to quickly disassemble the trailer.
[0028] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art can modify this utility model or modify it into an equivalent technical solution using the technical solution described above. Therefore, any simple modifications or equivalent substitutions made based on the technical solution of this utility model are within the scope of protection claimed by this utility model.
Claims
1. A suspended linkage door trailer for connecting a suspension rail (1) and a linkage door frame (2), comprising a main frame (3) and two sub-frames (4), characterized in that: The two subframes (4) are detachably fixed to the main frame (3). Each of the two subframes (4) is equipped with a pulley assembly via a self-balancing component. The self-balancing component is also detachably equipped with a self-lubricating component for lubricating the pulley assembly. The bottom of the main frame (3) is detachably equipped with a lifting component. The main frame (3) rolls within the hanging rail (1) via the pulley assembly. The lifting component is fixed to the top of the linkage door frame (2).
2. The trolley with a lifting linkage door as described in claim 1, characterized in that: The upper and lower ends of the two subframes (4) are fixed with connecting hooks (5), and the upper and lower ends of the two subframes (4) are connected to each other by connecting hooks (5). The main frame (3) has symmetrical screw holes (6) on both sides of the bottom. The screw holes (6) are threaded with screws (7). The two subframes (4) are fixed to the main frame (3) by screws (7).
3. The trolley with a lifting linkage door as described in claim 1, characterized in that: The self-balancing assembly includes two balance plates (8), which are located on one side of the two subframes (4). Each balance plate (8) has a connecting hole (9) in the middle, and each of the two subframes (4) has a through hole (10) in the middle. The balance plate (8) is rotatably mounted on the subframe (4) by a rivet (11), which passes through the connecting hole (9) and the through hole (10).
4. The trolley with a lifting linkage door as described in claim 3, characterized in that: The pulley assembly includes four pulleys (13), which are rotatably mounted on both ends of the balance plate (8) via pins (14) and roll inside the hanging rail (1).
5. The trolley with a lifting linkage door as described in claim 4, characterized in that: The self-lubricating assembly includes two oil boxes (15), and each oil box (15) has a connecting buckle (16) fixed on its inner side. The two oil boxes (15) are respectively fastened to the outer side of the middle of the two balance plates (8) through the connecting buckle (16).
6. The trolley with a lifting linkage door as described in claim 5, characterized in that: Each oil box (15) is fixed with a sponge sheet (17), both ends of which extend out of the oil box (15). Both ends of the sponge sheet (17) abut against the surfaces of two pulleys (13). Each oil box (15) has an oil injection hole (18) at the top center.
7. The trolley with a lifting linkage door as described in claim 1, characterized in that: The lifting assembly includes a screw hole (19), which is located at the bottom center of the main frame (3). A connecting screw (20) is threaded onto the wall of the screw hole (19), and a lifting block (21) is threaded onto the bottom end of the connecting screw (20). The lifting block (21) is fixed to the inner top of the linkage door frame (2).