Power assisting device for top rod of stair-climbing trolley

Abstract

The utility model provides a power assisting device for a top rod of a stair-climbing trolley, which relates to the technical field of stair-climbing trolleys and comprises a frame, one end of the frame is a resistance end, the other end of the frame is a force application end, the frame is provided with a loading end, a stair-climbing wheel set, a fulcrum rotating shaft and a handle, the loading end and the stair-climbing wheel set are arranged at the resistance end, the handle is arranged at the force application end, and the fulcrum rotating shaft is arranged at the force application end. The supporting point rotating shaft is arranged at the force application end, the supporting point rotating shaft is arranged between the resistance end and the force application end, and an ejector rod used for abutting against stair steps is hinged to the supporting point rotating shaft. Compared with an existing stair-climbing vehicle which needs to overcome all the gravity of the vehicle frame and the cargos to drag and climb stairs, the stair-climbing vehicle is more labor-saving, and a user only needs to overcome part of the gravity of the vehicle frame and the cargos to achieve stair-climbing transportation.

Description

Technical Field

[0001] This utility model relates to the field of stair climbing vehicle technology, and in particular to a stair climbing trolley top rod assist device. Background Technology

[0002] When moving goods up and down stairs, users often use stair-climbing carts. Existing stair-climbing carts use a set of triangular combination wheels mounted on the frame. These carts can only be pulled by a person standing on the upper stairs, using the triangular combination wheels to climb. This upward-pulling method of transporting goods up stairs requires the user to overcome the full weight of the cart and the goods, resulting in high physical exertion and slow transport speed, especially for heavy objects. Due to the narrow treads, it is difficult to keep the bottom of the cart stable, requiring the user to continuously exert force to maintain balance. This makes it impossible to rest midway, which can easily lead to fatigue or loss of control, posing certain safety hazards.

[0003] Therefore, a stair-climbing trolley top rod assist device is needed to solve the above problems. Utility Model Content

[0004] This utility model proposes a stair-climbing trolley top rod assist device, which forms a lever structure through the frame, fulcrum pivot and top rod. The lever structure cooperates with the stair-climbing wheel set, so that the user only needs to overcome part of the weight of the frame and the goods to achieve stair-climbing transportation. Compared with the existing stair-climbing vehicles that need to overcome the entire weight of the frame and the goods to drag up the stairs, this device is more labor-saving.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A stair-climbing trolley with a top rod assist device includes a frame, one end of which is a resistance end and the other end of which is a force-applying end. The frame is provided with a load-bearing end, a stair-climbing wheel set, a fulcrum pivot, and a handle. The load-bearing end and the stair-climbing wheel set are both located at the resistance end, the handle is located at the force-applying end, and the fulcrum pivot is located between the resistance end and the force-applying end. A top rod for abutting against the stair steps is hinged to the fulcrum pivot.

[0007] As a preferred technical solution, the distance between the fulcrum shaft and the resistance end is less than the distance between the fulcrum shaft and the force-applying end.

[0008] As a preferred technical solution, the pivot shaft is fixedly mounted on the vehicle frame.

[0009] As a preferred technical solution, a sliding seat is slidably mounted on the frame, and a sliding seat locking assembly is provided between the sliding seat and the frame. The pivot shaft is fixedly mounted on the sliding seat.

[0010] As a preferred technical solution, a backstop plate is hinged to the vehicle frame.

[0011] As a preferred technical solution, the free end of the top rod is hinged to a limiting member that acts on the external corner of the stair step, and a reset element is provided between the top rod and the limiting member.

[0012] As a preferred technical solution, two sliding rods are arranged in parallel on the frame, the sliding seat includes two sliding sleeves, each of the sliding sleeves is slidably mounted on one of the sliding rods, the fulcrum shaft is fixedly installed between the two sliding sleeves, and the sliding seat locking assembly is a locking bolt.

[0013] As a preferred technical solution, a retraction linkage is provided between the top rod and the anti-retraction plate.

[0014] As a preferred technical solution, a support shaft is provided at the bottom of the lower end of the frame, and the stair climbing wheel set includes two sets of combined wheels. The two sets of combined wheels are respectively installed at both ends of the support shaft. Each combined wheel includes a wheel frame rotatably installed on the support shaft, and three wheels are rotatably installed on each wheel frame.

[0015] As a preferred technical solution, the top rod is provided with a hook, and the frame is provided with a transverse support rod adapted to the hook.

[0016] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0017] Because the stair-climbing trolley's top rod assist device includes a top rod, during the use of this device, the goods are placed on the carrying end, and the lower end of the top rod abuts against the stair step, forming a lever structure with the fulcrum as the fulcrum, the force-applying end as the force point, and the resistance end as the resistance point. The user holds the handle and applies downward pressure to the force-applying end, causing the trolley frame to rotate around the fulcrum as the fulcrum, thereby raising the carrying end. After the carrying end is raised, the user pushes the trolley frame towards the upper step, thus achieving stair-climbing transportation in conjunction with the stair wheel assembly.

[0018] In a lever structure, the vertical distance from the point of force application to the fulcrum is the effort arm, and the vertical distance from the point of resistance to the fulcrum is the resistance arm. According to the lever's equilibrium condition, the product of the effort and the effort arm equals the product of the resistance and the resistance arm. In this invention, the effort is the force applied by the user to the force application end, and the resistance is the weight of the frame and cargo at the resistance end. Since the distance between the fulcrum pivot and the resistance end is less than the distance between the fulcrum pivot and the force application end, the resistance arm is less than the effort arm. Consequently, the effort required by the user is less than the resistance. Compared to existing stair-climbing vehicles where the user needs to overcome the entire weight of the vehicle and cargo, this invention only requires the user to overcome a portion of the weight of the frame and cargo to achieve stair-climbing transportation. Thus, this invention achieves more labor-saving stair-climbing transportation.

[0019] When using existing stair-climbing vehicles, due to the limited area of ​​the steps, it is impossible to keep the lower end of the vehicle stably on the stair steps during the transport of goods. Users need to use a lot of force to keep the frame stable, which makes it impossible for users to stop and rest during the transport of goods. However, when using this device, the top rod abuts against the lower step, which can prevent the frame from tipping backward when climbing, improve the stability of the stair-climbing operation, and allow users to stop and rest during the transport of goods.

[0020] Because the stair-climbing trolley's top rod assist device includes a backstop plate, which is hinged to the frame, during the stair-climbing transport process, the free end of the backstop plate abuts against the stair steps, further preventing the frame from moving backward during stair-climbing transport and further ensuring the user's safety. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure for mounting the pushrod and anti-reverse plate onto the vehicle frame;

[0023] Figure 2 for Figure 1 The left view;

[0024] Figure 3 This is a schematic diagram of the top rod structure;

[0025] Figure 4 for Figure 3 The left view;

[0026] Figure 5 A reference point for the state before climbing the stairs;

[0027] Figure 6 Used as a reference point when climbing stairs;

[0028] Figure 7 This serves as a reference point for the state after the ascent.

[0029] The components are as follows: 1. Frame; 2. Resistance end; 3. Force application end; 4. Cargo-carrying end; 5. Stair-climbing wheel set; 6. Pivot pivot; 7. Handle; 8. Stair step; 9. Top rod; 10. Anti-reverse plate; 11. Stair step corner; 12. Limiting component; 13. Reset element; 14. Hinge shaft; 15. Anti-slip groove; 16. Sliding rod; 17. Sliding sleeve; 18. Locking bolt; 19. Retraction and extension linkage chain; 20. Support shaft; 21. Wheel set frame; 22. Wheel; 23. Hook; 24. Lateral support rod; 25. First rubber pad; 26. Second rubber pad; 27. Third rubber pad; 28. Fourth rubber pad; 29. ​​Cargo. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1-7 As shown, the stair-climbing trolley top rod assist device includes a frame 1, one end of which is a resistance end 2, and the other end of which is a force-applying end 3. The frame 1 is provided with a load end 4, a stair-climbing wheel set 5, a fulcrum pivot 6, and a handle 7. The load end 4 and the stair-climbing wheel set 5 are both located at the resistance end 2, the handle 7 is located at the force-applying end 3, and the fulcrum pivot 6 is located at the force-applying end 3. The fulcrum pivot 6 is located between the resistance end 2 and the force-applying end 3. A top rod 9 for abutting against the stair steps 8 is hinged on the fulcrum pivot 6. When using this device, the goods 29 are placed on the load end 4.

[0032] Among them, the distance between the fulcrum shaft 6 and the resistance end 2 is less than the distance between the fulcrum shaft 6 and the force-applying end 3.

[0033] Additionally, the pivot shaft 6 is fixedly mounted on the frame 1.

[0034] like Figure 2 As shown, a sliding seat is slidably mounted on the frame 1, and a sliding seat locking assembly is provided between the sliding seat and the frame 1. The pivot shaft 6 is fixedly mounted on the sliding seat.

[0035] A backstop plate 10 is hinged to the frame 1.

[0036] The free end of the top rod 9 is hinged to a limiting member 12 that acts on the external corner 11 of the stair step, and a reset element 13 is provided between the top rod 9 and the limiting member 12.

[0037] In this utility model, the limiting member 12 is configured as a right-angled plate structure, and the limiting member 12 is hinged to the free end of the push rod 9 via the hinge shaft 14. The reset element 13 is a torsion spring sleeved on the hinge shaft 14, such as... Figure 7 As shown, after the frame 1 has climbed one step 8 of the stairs, the user needs to push the frame 1 forward and raise the force-applying end 3, so that the lower end of the push rod 9 moves towards the upper step 8 of the stairs, ultimately moving the frame 1 to the position shown. Figure 5 As shown, in this utility model, by setting a limiting member 12, the limiting member 12 cooperates with the external corner 11 of the stair step. That is, when the free end of the limiting member 12 abuts against the external corner 11 of the stair step, the free end of the top rod 9 abuts against the anti-slip groove 15 on the stair step 8, thus preventing the user from manually moving the top rod 9.

[0038] Two sliding rods 16 are arranged in parallel on the frame 1. The sliding seat includes two sliding sleeves 17. Each sliding sleeve 17 is slidably installed on a sliding rod 16. A pivot shaft 6 is fixedly installed between the two sliding sleeves 17. The sliding seat locking assembly is a locking bolt 18.

[0039] In this utility model, the positions of the fulcrum shaft 6 and the top rod 9 on the frame 1 are adjustable by the cooperation of the sliding sleeve 17 and the locking bolt 18, so that the installation position of the top rod 9 can be adjusted according to the height of the existing frame 1, and the free end of the top rod 9 can be adapted to the stair step 8.

[0040] A retraction linkage chain 19 is provided between the push rod 9 and the anti-reverse plate 10.

[0041] like Figure 1 and Figure 2 As shown, a support shaft 20 is provided at the bottom of the lower end of the frame 1. The stair climbing wheel set 5 includes two sets of combined wheels, which are respectively installed at both ends of the support shaft 20. Each combined wheel includes a wheel frame 21 rotatably installed on the support shaft 20, and three wheels 22 are rotatably installed on each wheel frame 21.

[0042] The top rod 9 is equipped with a hook 23, and the frame 1 is equipped with a transverse support rod 24 that is compatible with the hook 23.

[0043] Because the top rod 9 is equipped with a hook 23, and a retraction linkage chain 19 connects the top rod 9 and the anti-reverse plate 10, when the goods 29 are not being transported, the hook 23 can be hooked onto the horizontal support rod 24, thereby retracting the top rod 9. At the same time, under the connection of the retraction linkage chain 19, the anti-reverse plate 10 is moved away from the stair steps 8 or the ground, so that the frame 1 can move forward and backward normally.

[0044] A first rubber pad 25 is provided on the side wall adjacent to the step of the top rod 9, a second rubber pad 26 is provided on the end of the top rod 9 that abuts against the stair step 8, a third rubber pad 27 is provided on the limiting member 12, and a fourth rubber pad 28 is provided on the side of the anti-reverse plate 10 near the step.

[0045] In this utility model, the first rubber pad 25, the second rubber pad 26 and the third rubber pad 27 can buffer the collision between the top rod 9 and the step, reducing noise. The second rubber pad 26 can also play a role in preventing slippage. The fourth rubber pad 28 can buffer the collision between the anti-reverse plate 10 and the stair step 8, reducing noise.

[0046] In summary, this utility model forms a lever structure through the frame, fulcrum pivot, and top rod. The lever structure, in conjunction with the stair-climbing wheel set, allows the user to overcome only part of the weight of the frame and the cargo to achieve stair-climbing transportation. Compared with existing stair-climbing vehicles that require overcoming the full weight of the frame and cargo to drag up stairs, this device is more labor-saving.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stair-climbing trolley top rod assist device, characterized in that, The vehicle includes a frame, one end of which is a resistance end and the other end of which is a force-applying end. The frame is equipped with a load-bearing end, a stair-climbing wheel assembly, a fulcrum pivot, and a handle. The load-bearing end and the stair-climbing wheel assembly are both located at the resistance end, the handle is located at the force-applying end, and the fulcrum pivot is located at the force-applying end. The fulcrum pivot is positioned between the resistance end and the force-applying end, and a top rod for abutting against the stair steps is hinged to the fulcrum pivot.

2. The stair-climbing trolley top rod assist device according to claim 1, characterized in that, The distance between the fulcrum shaft and the resistance end is less than the distance between the fulcrum shaft and the force-applying end.

3. The stair-climbing trolley top rod assist device according to claim 2, characterized in that, The pivot shaft is fixedly mounted on the vehicle frame.

4. The stair-climbing trolley top rod assist device according to claim 2, characterized in that, A sliding seat is slidably mounted on the frame, and a sliding seat locking assembly is provided between the sliding seat and the frame. The pivot shaft is fixedly mounted on the sliding seat.

5. The stair-climbing trolley top rod assist device according to claim 3 or 4, characterized in that, A backstop plate is hinged to the frame.

6. The stair-climbing trolley top rod assist device according to claim 5, characterized in that, The free end of the top rod is hinged to a limiting member that acts on the external corner of the stair step, and a reset element is provided between the top rod and the limiting member.

7. The stair-climbing trolley top rod assist device according to claim 4, characterized in that, Two sliding rods are arranged in parallel on the frame. The sliding seat includes two sliding sleeves. Each sliding sleeve is slidably mounted on one of the sliding rods. The fulcrum shaft is fixedly installed between the two sliding sleeves. The locking assembly of the sliding seat is a locking bolt.

8. The stair-climbing trolley top rod assist device according to claim 5, characterized in that, A retraction and extension linkage is provided between the top rod and the anti-retraction plate.

9. The stair-climbing trolley top rod assist device according to claim 1, characterized in that, The frame has a support shaft at its lower bottom. The stair-climbing wheel set includes two sets of combined wheels, which are respectively installed at both ends of the support shaft. Each combined wheel includes a wheel frame rotatably mounted on the support shaft, and three wheels are rotatably mounted on each wheel frame.

10. The stair-climbing trolley top rod assist device according to claim 8, characterized in that, The top rod is equipped with a hook, and the frame is equipped with a transverse support rod that is compatible with the hook.

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