Height-adjustable trolley

Abstract

The utility model provides a height-adjustable handcart which comprises a loading frame, a bottom-supporting frame, moving wheels and a mounting plate, the moving wheels are fixedly mounted below the loading frame and the bottom-supporting frame, the bottom-supporting frame is located below the loading frame, the mounting plate is rotatably connected with the bottom-supporting frame, and the bottom-supporting frame is fixedly connected with the loading frame. The mounting plate is positioned on one side of the lower part of the loading frame and one side of the upper part of the underpinning frame; the carrying efficiency and safety are improved through a unique height adjusting mechanism, and manual carrying is reduced. The stacking type design optimizes space utilization and is suitable for the storage environment. Operation is simple and complex training is not needed. The stability and safety are guaranteed through self-locking transmission and the double-rack bull wheel design, the adaptability is high, and various carrying requirements are flexibly met.

Description

Technical Field

[0001] The utility model belongs to the technical field of trolleys, and in particular relates to a height-adjustable trolley. Background Art

[0002] In logistics, warehousing, and industrial production, trolleys are indispensable tools that significantly improve the efficiency of cargo loading, unloading, and transportation. To further optimize this process, modern trolleys often incorporate the innovative design of height adjustment. This design cleverly addresses the challenge of transferring cargo between different heights. Whether easily lifting from the ground to the height of a shelf or a carriage on alternate transport equipment, or safely lowering from a height to the ground, it effectively reduces the operator's physical burden, improving both efficiency and comfort.

[0003] However, even with the convenience of height adjustment, the traditional operation mode still inevitably requires direct and multiple human participation in the process of loading and unloading goods, which to a certain extent still limits the maximization of efficiency and may cause unnecessary physical stress on workers.

[0004] Therefore, it is very necessary to invent a height-adjustable handcart. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a height-adjustable trolley, including a loading frame, a bottom supporting frame, movable wheels and a mounting plate, wherein movable wheels are fixedly installed under the loading frame and the bottom supporting frame, the bottom supporting frame is located under the loading frame, the mounting plate is rotatably connected to the bottom supporting frame, and the mounting plate is located on the lower side of the loading frame and the upper side of the bottom supporting frame.

[0006] Preferably, a push rod and a lifting mechanism are installed on the cargo carrier frame, and the lifting mechanism is arranged around the push rod, and the two do not interfere with each other.

[0007] Preferably, the lifting mechanism includes a chassis, a transmission shaft, a climbing gear and a rack. The chassis is fixed to the cargo carrier frame. Climbing gears are fixedly installed at both ends of the transmission shaft rotatably installed inside the chassis. The climbing gear is engaged with the rack. The rack passes through the chassis and the cargo carrier frame and is slidably connected to the two.

[0008] Preferably, the lifting mechanism also includes a worm, a driving part and a worm wheel. The worm is rotatably installed in the chassis, and either end of the worm rotates out of the chassis and is fixed to the driving part arranged externally. The worm is engaged with the worm wheel below, and the worm wheel is fixedly installed in the middle position of the transmission shaft.

[0009] Preferably, two racks are provided, which are parallel to each other and perpendicular to the ground, and the roots of the racks are fixed to the mounting plate.

[0010] Preferably, the movable wheels are respectively fixedly mounted on the angled area below the cargo carrier frame and the bottom supporting frame, and the movable wheels mounted on the cargo carrier frame are located outside the movable wheels mounted on the bottom supporting frame, and the two do not interfere with each other's movable wheels.

[0011] Preferably, the distance between the lower surface of the cargo carrying frame and the ground, that is, the chassis space of the cargo carrying frame allows the bottom supporting frame and the moving wheels installed on the bottom supporting frame to be accommodated.

[0012] Preferably, the size of the moving wheels installed on the cargo carrier frame is larger than the size of the moving wheels installed on the bottom supporting frame, and at least one of the moving wheels installed on both frames is in contact with the ground or the bottom surface of the area where the goods need to be placed.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This utility model significantly improves handling efficiency and safety through its unique height adjustment mechanism. Without the need for frequent manual handling, the loaded trolley can be pushed directly to the target location, and the lifting mechanism can be used to achieve smooth lifting and precise positioning of the goods, greatly reducing the risks and physical exertion of manual operation. At the same time, its stacking design effectively enhances space utilization, and the compact layout saves storage space and improves transportation efficiency, making it particularly suitable for space-constrained environments such as logistics warehousing. In terms of ease of operation, the push rod and lifting mechanism are reasonably arranged, and the external drive unit is simple and easy to use, allowing quick use without complex training. In addition, the self-locking function of the worm gear transmission system and the design of double racks and large-diameter moving wheels ensure the stability and safety of the goods, and can operate smoothly even on uneven ground. Finally, the trolley's adjustable height and the different sizes of the moving wheels demonstrate its strong adaptability and flexibility, which can easily cope with various handling needs and is an ideal choice in the field of logistics handling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a partial cross-sectional structural schematic diagram of the utility model.

[0017] Figure 3 This utility model Figure 2 Schematic diagram of the local enlarged structure at point A.

[0018] Figure 4 It is a structural schematic diagram of the mounting plate and the bottom supporting frame of the utility model.

[0019] In the picture:

[0020] The cargo carrier frame 1 , the bottom supporting frame 2 , the moving wheel 3 , the mounting plate 4 , the push rod 5 , the lifting mechanism 6 , the chassis 61 , the worm 62 , the transmission shaft 63 , the driving part 64 , the worm gear 65 , the climbing gear 66 , and the rack 67 . DETAILED DESCRIPTION

[0021] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0022] In the description of the embodiments, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0023] As attached Figure 1 To the attached Figure 4 As shown: The utility model provides a height-adjustable trolley, including a loading frame 1, a bottom supporting frame 2, movable wheels 3 and a mounting plate 4. The loading frame 1 and the bottom supporting frame 2 are fixedly installed with movable wheels 3. The bottom supporting frame 2 is located below the loading frame 1. The mounting plate 4 is rotatably connected to the bottom supporting frame 2. The mounting plate 4 is located on the lower side of the loading frame 1 and the upper side of the bottom supporting frame 2.

[0024] Furthermore, the carrier frame 1 cleverly integrates a push rod 5 and a lifting mechanism 6, which do not interfere with each other in terms of spatial layout. The push rod 5 allows the user to manually push the entire carrier, while the lifting mechanism 6 surrounds the push rod 5, ensuring operational flexibility and maximizing space utilization.

[0025] Furthermore, the design of the lifting mechanism 6 is complex and sophisticated, primarily comprising a chassis 61, a drive shaft 63, a worm 62, a worm gear 65, a climbing gear 66, and a rack 67. The chassis 61 is securely fixed to the carriage frame 1, providing a solid foundation for the entire lifting system. The drive shaft 63 is rotatably mounted within the chassis 61, with climbing gears 66 mounted at each end. These gears mesh tightly with a rack 67 that passes through the chassis 61 and the carriage frame 1, enabling the lifting function.

[0026] Furthermore, to drive the rotation of transmission shaft 63 and climbing gear 66, lifting mechanism 6 incorporates a transmission system consisting of a worm 62 and a worm gear 65. Worm 62 is rotatably mounted within chassis 61, with one end extending out of the chassis and connected to an external drive unit 64. Power input from drive unit 64 rotates worm 62, driving worm gear 65 below. Worm gear 65 is fixedly mounted in the middle of transmission shaft 63, thus achieving efficient power transmission and conversion.

[0027] Furthermore, rack 67 is a key component of the lifting mechanism. This design utilizes two racks 67, parallel to each other and perpendicular to the ground. This design not only enhances the stability of the lifting process but also improves the load-bearing capacity. The base of rack 67 is tightly connected to mounting plate 4, ensuring stability and reliability during the lifting process.

[0028] Furthermore, to enhance the mobility of the loading device, the moving wheels 3 are mounted in the lower angled area between the loading frame 1 and the base frame 2. It is worth noting that the moving wheels on the loading frame 1 are located outside the moving wheels on the base frame 2. This layout avoids mutual interference between the two and ensures smooth movement.

[0029] Furthermore, a certain distance is left between the lower surface of the cargo carrier frame 1 and the ground. This design cleverly utilizes the chassis space, allowing the bottom frame 2 and the movable wheels 3 mounted thereon to be completely stored therein. This design not only reduces the overall size of the device, but also improves the convenience of transportation and storage.

[0030] Furthermore, the moving wheels 3 mounted on the cargo carrier frame 1 and the supporting frame 2 are of different sizes, with the larger wheels on the cargo carrier frame 1. This design ensures that in different usage scenarios, at least one set of moving wheels 3 can maintain contact with the ground or the bottom surface where the cargo needs to be placed, thereby ensuring the stability and flexibility of the device.

[0031] Working Principle: First, the cargo is securely placed on the cargo carrier 1. Then, by operating the push rod 5, the entire device is easily pushed to a precise location near the transportation equipment. At this point, the operator activates the lifting mechanism using the drive unit 64 (either a convenient handle or an efficient motor). As the worm 62 rotates, it drives the transmission shaft 63 through a precise worm gear transmission, slowly rotating it. This in turn drives the climbing gear 66 downward along the path of the rack 67. This process is not only smooth, but also ensures that the supporting frame 2 gradually approaches the ground until its moving wheels 3 firmly touch the ground.

[0032] At this transition point, the device's support structure undergoes a clever shift: instead of driving rack 67 downward, climbing gear 66 instead ascends along rack 67, gracefully propelling the carriage 1 upward. When the carriage 1 reaches the desired height, the drive unit 64 deactivates, and the entire device is then pushed toward the entrance of the transport vehicle's carriage. This ensures that the carriage 1's wheels 3 are fully inside the carriage, while its rear end remains suspended for subsequent operation.

[0033] Next, the drive unit 64 is activated in the reverse direction, and the worm 62 rotates in the opposite direction, driving the cargo carriage 1 to slowly descend until its moving wheels 3 are in close contact with the bottom of the carriage, laying a solid foundation for the next movement. Afterwards, the bottom support frame 2 is fine-tuned to ensure that it will not collide with the edge of the carriage during its ascent.

[0034] The reverse rotation of the driving unit 64 is started again. At this time, since the cargo frame 1 is firmly supported on the bottom of the carriage, the role of the climbing gears 66 is reversed again. They no longer rise, but instead drive the rack 67 and the mounting plate 4 connected to it and the bottom support frame 2 to rise together. As the bottom support frame 2 reaches the appropriate height, the device is pushed further into the carriage until it is fully in place.

[0035] By repeating these steps, each trolley's support frame 2 cleverly fits underneath the previous trolley's cargo frame 1, maximizing space utilization until the trolley is fully loaded. This process not only demonstrates the ingenuity and efficiency of the design, but also ensures safe and smooth cargo handling.

[0036] Utilizing the technical solution described in the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.

Claims

1. A height-adjustable trolley, characterized in that: The utility model comprises a loading frame (1), a bottom supporting frame (2), a movable wheel (3) and a mounting plate (4), wherein the movable wheel (3) is fixedly mounted below the loading frame (1) and the bottom supporting frame (2), the bottom supporting frame (2) is located below the loading frame (1), the mounting plate (4) is rotatably connected to the bottom supporting frame (2), and the mounting plate (4) is located on the lower side of the loading frame (1) and the upper side of the bottom supporting frame (2).

2. The height-adjustable trolley according to claim 1, characterized in that: A push rod (5) and a lifting mechanism (6) are installed on the cargo carrier frame (1). The lifting mechanism (6) is arranged at positions around the push rod (5) so that the two do not interfere with each other.

3. The height-adjustable trolley according to claim 2, characterized in that: The lifting mechanism (6) includes a chassis (61), a transmission shaft (63), a climbing gear (66) and a rack (67). The chassis (61) is fixed to the vehicle frame (1). The transmission shaft (63) rotatably installed inside the chassis (61) is fixedly mounted with climbing gears (66) at both ends. The climbing gear (66) is meshed with the rack (67). The rack (67) passes through the chassis (61) and the vehicle frame (1) and is slidably connected to the two.

4. The height-adjustable trolley according to claim 3, characterized in that: The lifting mechanism (6) further comprises a worm (62), a driving portion (64) and a worm wheel (65). The worm (62) is rotatably mounted in the chassis (61), and one end of the worm (62) is rotated out of the chassis (61) and fixed to the driving portion (64) provided externally. The worm (62) is meshed with the worm wheel (65) below, and the worm wheel (65) is fixedly mounted in the middle position of the transmission shaft (63).

5. The height-adjustable trolley according to claim 3, characterized in that: Two racks (67) are provided, which are parallel to each other and perpendicular to the ground, and the roots of the racks (67) are fixed to the mounting plate (4).

6. The height-adjustable trolley according to claim 1, characterized in that: The movable wheels (3) are respectively fixedly mounted on the angled areas below the cargo-carrying frame (1) and the bottom supporting frame (2); the movable wheels (3) mounted on the cargo-carrying frame (1) are located outside the movable wheels (3) mounted on the bottom supporting frame (2), and the movable wheels (3) mounted on the bottom supporting frame (2) do not interfere with each other's movable wheels (3).

7. The height-adjustable trolley according to claim 6, characterized in that: The distance between the lower surface of the cargo-carrying frame (1) and the ground, that is, the chassis space of the cargo-carrying frame (1), allows the bottom supporting frame (2) and the moving wheels (3) installed on the bottom supporting frame (2) to be accommodated.

8. The height-adjustable trolley according to claim 7, characterized in that: The size of the moving wheels (3) installed on the cargo carrier frame (1) is larger than the size of the moving wheels (3) installed on the bottom support frame (2), and at least one of the moving wheels (3) installed on both of them is in contact with the ground, or is in contact with the bottom surface of the area where the cargo needs to be placed.

Images