Lifting dragging base

Abstract

The utility model discloses a lifting dragging base. The base comprises an outer groove plate, an inner groove plate, a plurality of moving assemblies and a wrench assembly, wherein the inner groove plate is nested in the outer groove plate in a sliding manner; the moving assembly comprises a connecting plate hinged to the outer groove plate and a moving wheel at the tail end, slope surfaces are arranged on the two sides of the inner groove plate, and matching surfaces which form surface contact transmission with the slope surfaces are arranged on the corresponding sides of the connecting plate; a torsion spring is arranged on the hinge shaft, two ends of the torsion spring respectively act on the connecting plate and the outer trough plate to force the connecting plate to cling to the inner trough plate in an initial state, so that the connecting plate is movably accommodated in a vacant area of the outer trough plate to ensure that the bottom surface of the outer trough plate clings to the ground; and when the wrench assembly is rotated, the inner groove plate slides to drive the matching surface to lift the moving wheel to a working state along the slope surface. The floor mopping prevention device is compact in structure, stable storage and floor mopping prevention of the moving wheels are achieved through surface contact transmission and torsional spring pre-tightening design, operation is convenient and fast, and reliability is high.

Description

Technical Field

[0001] This utility model relates to the field of mobile devices for household appliances, and in particular to a lifting and dragging base. Background Technology

[0002] Currently, household appliances (such as washing machines, refrigerators, and freezers) are large and heavy, often requiring bottom casters or temporary moving tools to move. A common solution in existing technology is to install fixed casters on the bottom of the appliance, but this design has significant drawbacks: firstly, the casters are easily damaged by external impacts due to prolonged exposure, and they cannot be stored away, affecting the stability of the appliance; secondly, some mobile stands use height-adjustable casters, but these often rely on complex linkage mechanisms or spring assemblies, resulting in a bulky structure, cumbersome installation, and the risk of spring fatigue and failure, posing a risk of the casters accidentally touching the ground.

[0003] In addition, some patents (such as CN217995582U) propose to drive the roller lifting by using a sliding groove plate in conjunction with a ramp surface. Although this simplifies the structure, the following problems still exist: the contact between the ramp surface and the transmission components is mostly line contact or point contact, which is prone to wear due to stress concentration, and the transmission accuracy decreases after long-term use; the roller lacks effective limit when it is stored, and is easily affected by vibration and makes slight contact with the ground, causing the base to wobble; at the same time, the sliding stroke control of the groove plate is not precise, which may lead to insufficient or excessive lifting height of the roller, affecting the stability of movement.

[0004] Therefore, there is an urgent need for a lifting and dragging base that is compact in structure, reliable in transmission, and can completely avoid the rollers dragging on the ground, while ensuring convenient movement and improving the stability and durability of the base in the storage state. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a lifting and dragging base.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a lifting and dragging base, comprising an outer groove plate for connecting household appliances, an inner groove plate slidably disposed within the outer groove plate, a plurality of movable components spaced apart on the two groove plates, and a wrench assembly for driving the inner groove plate to slide; the movable components include a connecting plate hinged to the outer groove plate and a movable wheel disposed at the end of the connecting plate, the inner groove plate having an inclined slope extending on at least one side along the sliding direction; the connecting plate having a mating surface on one side corresponding to the slope surface, which can form a surface contact transmission with it; the connecting plate is hinged to the outer groove plate via a hinge shaft, the hinge shaft having a torsion spring, the two free ends of the torsion spring acting on the connecting plate and the inner groove plate respectively, forcing the connecting plate to adhere to the inner groove plate in the initial state, so that the movable wheel is in a retracted state and the far end of the mating surface is located at the low point of the slope surface; when the wrench assembly is rotated, the inner groove plate slides relative to the outer groove plate, the mating surface moves from the low point to the high point along the slope surface, driving the connecting plate to rotate around the hinge shaft until the movable wheel is lifted.

[0007] As a preferred embodiment of this utility model, the connecting plate includes mating connecting rods symmetrically distributed on both sides of the moving wheel, and the mating surface is formed on the side wall of the mating connecting rod near the slope surface.

[0008] As a preferred embodiment of this utility model, the mating surface and the slope surface are of equal width to form full-width contact.

[0009] As a preferred technical solution of this utility model, the inner groove plate has movable grooves extending along the sliding direction on both sides of its sidewalls, and the outer groove plate is fixed with a limiting rod that passes through the two movable grooves. The limiting rod and the movable groove are fitted together to constrain the sliding stroke of the inner groove plate.

[0010] As a preferred technical solution of this utility model, the two side walls of the outer groove plate are provided with a gap area at the lower position of the slope, and the depth of the gap area is adapted to the diameter of the moving wheel; in the initial state, when the moving wheel is located at the lower position of the slope, the connecting plate is placed in the gap area under the action of the torsion spring preload.

[0011] As a preferred embodiment of this utility model, the wrench assembly includes an operating rod hinged to an outer groove plate, a guide pin is provided on one side of the adjacent hinge end of the operating rod, and an elongated hole is provided in the inner groove plate to cooperate with the guide pin; when the operating rod rotates, the guide pin moves along the trajectory of the elongated hole and pushes the inner groove plate to slide.

[0012] As a preferred technical solution of this utility model, the movable wheel is rotatably connected to the connecting plate through a pivot shaft, and the outer groove plate is provided with clearance grooves on both sides corresponding to the pivot shaft. When the movable wheel is in the storage state, the pivot shaft abuts against the clearance groove.

[0013] In summary, the beneficial effects of this utility model are as follows: the surface contact transmission design between the inclined surface of the inner groove plate and the mating surface of the connecting plate increases the contact area, effectively disperses stress, avoids the local wear problems caused by traditional line contact or point contact, and significantly extends the service life of the device; the torsion spring set on the hinge shaft forces the connecting plate to fit tightly against the inner groove plate through pre-tightening force, ensuring that the moving wheel is embedded in the empty area of ​​the outer groove plate in the stored state, completely avoiding accidental contact between the moving wheel and the ground, and ensuring the stability of the base when placed. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the lifting and dragging base of this utility model in use;

[0015] Figure 2 yes Figure 1 A magnified view of part A;

[0016] Figure 3 A schematic diagram of the structure of the mobile component in this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the inner groove plate and the moving component of this utility model;

[0018] Figure 5 yes Figure 4 A magnified view of part B.

[0019] Reference numerals: 1. Outer groove plate; 2. Inner groove plate; 3. Moving assembly; 4. Wrench assembly; 5. Connecting plate; 6. Moving wheel; 7. Sloping surface; 8. Mating surface; 9. Hinge shaft; 10. Torsion spring; 11. Mating connecting rod; 12. Movable groove; 13. Limiting rod; 14. Opening area; 15. Operating lever; 16. Guide pin; 17. Oblong hole; 18. Pivot shaft; 19. Clearance groove. Detailed Implementation

[0020] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0022] like Figures 1 to 5The illustrated lifting and towing base includes an outer groove plate 1 for connecting household appliances, an inner groove plate 2 slidably disposed within the outer groove plate 1, multiple moving components 3 spaced apart on the two groove plates, and a wrench assembly 4 for driving the inner groove plate 2 to slide. Each moving component 3 includes a connecting plate 5 that passes through the inner groove plate 2 and is hinged to the outer groove plate 1, and a moving wheel 6 located at the end of the connecting plate 5. The inner groove plate 2 has an inclined ramp surface 7 extending on at least one side along the sliding direction. The connecting plate 5 has a mating surface 8 on one side corresponding to the ramp surface 7, which can form surface contact transmission with the ramp surface 7. The connecting plate 5 is hinged to the outer groove plate 2 via a hinge shaft 9 (the hinge shaft 9 passes through a mounting hole in the side wall of the outer groove plate 1 and can be fixed by means of a snap ring, etc.; the connecting plate 5 is sleeved on the middle of the hinge shaft 9). A torsion spring 10 is provided on the hinge shaft 9. The two free ends of the torsion spring 10 act on the connecting plate 5 and the inner groove plate 2 respectively, forcing the connecting plate 5 to adhere to the inner groove plate 2 in the initial state, so that the moving wheel 6 is in the retracted state and the far end of the mating surface 8 is located at the low point of the slope surface 7. When the wrench assembly 4 is rotated, the inner groove plate 2 slides relative to the outer groove plate 1, and the mating surface 8 moves from the low point to the high point along the slope surface 7, driving the connecting plate 5 to rotate around the hinge shaft 9 until the moving wheel 6 is raised. In this embodiment, the slot structure of the outer groove plate 1 is adapted to the foot size of different household appliances. There is no need to disassemble the original parts. It is easy to install and can be reused. It is suitable for a variety of heavy appliances such as washing machines and freezers. It should be noted that the outer groove plate 1 can be detachably installed on the bottom of the household appliance.

[0023] The surface contact transmission design of the inner groove plate 2 slope surface 7 and the connecting plate 5 mating surface 8 increases the contact area, effectively disperses stress, avoids the local wear problem caused by traditional line contact or point contact, and significantly extends the service life of the device; the torsion spring 10 set on the hinge shaft 9 forces the connecting plate 5 to fit tightly against the inner groove plate 2 through pre-tightening force, ensuring that the moving wheel 6 is embedded in the empty area 14 of the outer groove plate 1 in the storage state, completely avoiding accidental contact between the moving wheel 6 and the ground, and ensuring the stability of the base when it is placed.

[0024] The connecting plate 5 includes mating connecting rods 11 symmetrically distributed on both sides of the moving wheel 6. The mating surface 8 is formed on the side wall of the mating connecting rod 11 near the slope surface 7. The mating surface 8 is the same width as the slope surface 7 to form full-width contact.

[0025] The inner groove plate 2 has movable grooves 12 extending along the sliding direction on both sides of its sidewalls. The outer groove plate 1 is fixed with a limiting rod 13 that passes through the two movable grooves 12. The limiting rod 13 and the movable groove 12 are fitted with a clearance to constrain the sliding stroke of the inner groove plate 2.

[0026] The outer groove plate 1 has open areas 14 on both sides corresponding to the lower part of the slope surface 7. The depth of the open areas 14 is adapted to the diameter of the moving wheel 6. In the initial state, when the moving wheel 6 is located at the lower part of the slope surface 7, the connecting plate 5 is placed in the open areas 14 (which can be a groove or notch, etc.) under the pre-tightening force of the torsion spring 10. The depth of the open areas 14 on both sides of the outer groove plate 1 is precisely adapted to the diameter of the moving wheel 6, so that the moving wheel 6 and the connecting plate 5 are placed in the open areas 14 in the stored state. The overall height is not increased, the space occupied is small, and the appearance is neat.

[0027] The wrench assembly 4 includes an operating rod 15 hinged to the outer groove plate 1. A guide pin 16 is provided on one side of the operating rod 15 adjacent to the hinge end. The inner groove plate 2 is provided with an elongated hole 17 (or an arc-shaped hole, depending on the specific structure) that mates with the guide pin 16. When the operating rod 15 rotates, the guide pin 16 moves along the trajectory of the elongated hole 17 and pushes the inner groove plate 2 to slide. A locking pin is added at the hinge of the operating rod 15 so that it can fit against the side of the outer groove plate 1 when stored, folding at 90°. In this embodiment, the wrench assembly 4, through the linkage design of the guide pin 16 and the elongated hole 17, transforms the user's single rotation operation (such as a 90° turn) into a linear sliding of the inner groove plate 2. Combined with the transmission of the inclined surface 7, it can quickly drive the moving wheel 6 to lift or store, saving time and effort.

[0028] The movable wheel 6 is rotatably connected to the connecting plate 5 via a pivot shaft 18. The outer groove plate 1 has clearance grooves 19 on both sides corresponding to the pivot shaft 18. When the movable wheel 6 is in the retracted state, the end of the pivot shaft 18 abuts against the clearance groove 19. In this embodiment, the pivot shaft 18 can be inserted through the movable wheel 6, or the two can be a single piece, or the two can be connected by fasteners.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as defined by the appended claims and their equivalents.

Claims

1. A lifting and towing base, comprising an outer groove plate (1) for connecting household appliances, an inner groove plate (2) slidably disposed within the outer groove plate (1), a plurality of moving components (3) spaced apart on the two groove plates, and a wrench assembly (4) for driving the inner groove plate (2) to slide; wherein the moving component (3) comprises a connecting plate (5) hinged to the outer groove plate (1) and a moving wheel (6) disposed at the end of the connecting plate (5), characterized in that: The inner groove plate (2) has an inclined slope (7) extending on at least one side along the sliding direction; the connecting plate (5) has a mating surface (8) on one side corresponding to the slope (7) that can form a surface contact transmission with it; the connecting plate (5) is hinged to the outer groove plate (1) through a hinge shaft (9), and a torsion spring (10) is provided on the hinge shaft (9). The two free ends of the torsion spring (10) act on the connecting plate (5) and the inner groove plate (2) respectively, forcing the connecting plate (5) to adhere to the inner groove plate (2) in the initial state, so that the moving wheel (6) is in the retracted state and the far end of the mating surface (8) is located at the low position of the slope (7); when the wrench assembly (4) is rotated, the inner groove plate (2) slides relative to the outer groove plate (1), and the mating surface (8) moves from the low position to the high position along the slope (7), driving the connecting plate (5) to rotate around the hinge shaft (9) until the moving wheel (6) is in the raised state.

2. The lifting and towing base according to claim 1, characterized in that: The connecting plate (5) includes mating connecting rods (11) symmetrically distributed on both sides of the moving wheel (6), and the mating surface (8) is formed on the side wall of the mating connecting rod (11) near the slope surface (7).

3. The lifting and towing base according to claim 2, characterized in that: The mating surface (8) and the slope surface (7) are of equal width to form full-width contact.

4. The lifting and towing base according to claim 1, characterized in that: The inner groove plate (2) has movable grooves (12) extending along the sliding direction on both sides. The outer groove plate (1) is fixed with a limiting rod (13) that passes through the two movable grooves (12). The limiting rod (13) and the movable groove (12) are fitted with a clearance to constrain the sliding stroke of the inner groove plate (2).

5. The lifting and towing base according to claim 1, characterized in that: The outer groove plate (1) has a gap area (14) on both sides corresponding to the lower position of the slope surface (7). The depth of the gap area (14) is adapted to the diameter of the moving wheel (6). In the initial state, when the moving wheel (6) is located at the lower position of the slope surface (7), the connecting plate (5) is placed in the gap area (14) under the pre-tightening force of the torsion spring (10).

6. The lifting and towing base according to claim 1, characterized in that: The wrench assembly (4) includes an operating rod (15) hinged to the outer groove plate (1). The operating rod (15) has a guide pin (16) on one side adjacent to the hinge end. The inner groove plate (2) has an elongated hole (17) that cooperates with the guide pin (16). When the operating rod (15) rotates, the guide pin (16) moves along the trajectory of the elongated hole (17) and pushes the inner groove plate (2) to slide.

7. The lifting and towing base according to claim 1, characterized in that: The movable wheel (6) is rotatably connected to the connecting plate (5) via a pivot shaft (18). The outer groove plate (1) has clearance grooves (19) on both sides corresponding to the pivot shaft (18). When the movable wheel (6) is in the storage state, the pivot shaft (18) abuts against the clearance groove (19).

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