Retractable and expandable wheel leg structure

Abstract

The utility model discloses a wheel leg structure capable of being folded and unfolded, which relates to the field of wheel carrier structures, and adopts the technical scheme that the wheel leg structure comprises a main body, a guide rail, a sliding block, a wheel rod and a roller, the guide rail is vertically arranged on the main body, the sliding block is in sliding fit with the guide rail, a clamping mechanism is arranged between the guide rail and the sliding block, and the clamping mechanism enables the sliding block to be fixed to the upper section or the lower section of the guide rail; the upper ends of the two wheel rods are located on the two sides of the guide rail respectively, the lower ends of the two wheel rods are obliquely arranged in the opposite directions, the wheel rods are in sliding fit relative to the main body, the upper ends of the wheel rods are connected with the sliding blocks through connecting rods, and rolling wheels are arranged at the lower ends of the wheel rods. The retraction or extension of the wheel rod relative to the main body can be well realized, the state of the wheel rod can be locked and unlocked, and the wheel rod is kept in the retraction or extension state. A user can select to use according to actual needs.

Description

Technical Field

[0001] This utility model relates to the field of wheel frame structures, and in particular to a retractable and deployable wheel leg structure. Background Technology

[0002] Currently, the wheel spacing of transport tools such as suitcases and trolleys is usually fixed. A shorter wheel spacing takes up less space, but the center of gravity is higher, making it easier to tip over during transport. If the wheel spacing is too long, the center of gravity is lower, making movement more stable, but it takes up too much space. If the wheel spacing is fixed, there is no way to make efficient use of space. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a retractable and extendable wheel leg structure, which can effectively realize the retraction or extension of the wheel rod relative to the main body, and can lock and unlock it, keeping the wheel rod in the retracted or extended state.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a retractable and deployable wheel leg structure, including a main body, a guide rail, a slider, a wheel rod, and a roller;

[0005] The main body is vertically provided with the guide rail, the slider is slidably engaged with the guide rail, and a locking mechanism is provided between the guide rail and the slider, the locking mechanism fixing the slider to the upper or lower section of the guide rail;

[0006] The upper ends of the two wheel rods are respectively located on both sides of the guide rail, and the lower ends of the two wheel rods are inclined in opposite directions. The wheel rods slide relative to the main body. The upper ends of the wheel rods are connected to the slider through a connecting rod, and the lower ends of the wheel rods are provided with rollers.

[0007] Since the upper end of the wheel rod is connected to the slider via a connecting rod, the wheel rod will retract when the slider is at the upper part of the guide rail and extend when the slider is at the lower part of the guide rail. Furthermore, since the two wheel rods are inclined in opposite directions, when the wheel rod extends, the bottom of the wheel rod will be further away, so as to lower the overall center of gravity and better play the role of moving and bearing. When retracted, the distance is closer, which can occupy less space.

[0008] Preferably, the main body is provided with a plurality of guide wheels adapted to the side of the wheel rod. Using guide wheels can reduce the friction between the wheel rod and the main body.

[0009] Preferably, the lower ends of the two wheel rods are distributed crosswise towards the other side of the guide rail. This results in a smaller footprint when retracted and a sufficiently large distance between them when extended.

[0010] Preferably, the locking mechanism includes a sliding rod, a first locking block, and a second locking block;

[0011] The sliding rod is axially slidably fitted inside the guide rail, and a reset elastic element is provided between the sliding rod and the guide rail. The reset elastic element slides the sliding rod toward the first end of the guide rail.

[0012] The guide rail has a control window on its side wall, and the sliding rod has a driving ramp on its side wall; the control window is slidably fitted with a ramp top rod, and the front end of the ramp top rod is positioned corresponding to the driving ramp.

[0013] The first locking block and the second locking block are respectively installed on the upper and lower sections of the guide rail.

[0014] The first locking block is provided with a first control ramp and a first pin; the side wall of the sliding rod is provided with a first locking ramp adapted to the first control ramp, the upper side wall of the guide rail is provided with a first locking hole adapted to the first pin, and the first locking block is provided with a first locking elastic element that pushes toward the first locking hole.

[0015] The second locking block is provided with a second control ramp and a second pin; the side wall of the sliding rod is provided with a second locking ramp adapted to the second control ramp, the lower side wall of the guide rail is provided with a second locking hole adapted to the second pin, and the second locking block is provided with a second locking elastic element that pushes toward the second locking hole;

[0016] Only one set of the first locking ramp and the first control ramp, and the second locking ramp and the second control ramp are aligned at any given time;

[0017] When the inclined push rod slides away from the end of the driving inclined surface;

[0018] Under the push of the reset elastic element, the sliding rod slides downward; the first locking slope pushes the first control slope, the first locking slope and the first control slope are misaligned, the first locking block slides away from the first locking hole, and the first pin retracts into the first locking hole; the second locking slope and the second control slope are aligned, the second locking elastic element pushes the second locking block to slide into the second locking hole, and the second pin extends from the second locking hole to the outside;

[0019] When the inclined push rod slides towards one end closer to the driving inclined surface;

[0020] Under the push of the inclined rod against the driving inclined surface, the sliding rod slides upward; the second locking inclined surface pushes the second control inclined surface to align, the second locking inclined surface pushes the second control inclined surface to disalign, the second locking block slides away from the second locking hole, and the second pin retracts into the second locking hole; the first locking inclined surface aligns with the first control inclined surface, the first locking elastic element pushes the first locking block to slide towards the first locking hole, and the first pin extends from the first locking hole to the outside;

[0021] The slider is provided with an outer hole that is adapted to the first pin portion or the second pin portion.

[0022] In the initial state, the slider is located in the first upper section, and the first pin extending to the outside is engaged with the outer hole and the first locking hole at the upper end of the guide rail side wall. The slider is locked in the upper section of the guide rail. At this time, the wheel rod retracts into the main body and is locked.

[0023] When the wheel rod needs to be extended, the inclined top rod slides away from the end of the driving inclined surface; the first pin retracts into the first locking hole, the slider is unlocked in the upper section, and under the action of the wheel rod's own gravity, the slider slides down to the lower section. The second pin extends from the second locking hole to the outside, and the second pin engages with the outer hole and the second locking hole in the lower section of the guide rail sidewall, thereby locking the slider in the lower section of the guide rail.

[0024] When the wheel needs to be retracted, the inclined top rod slides towards the end closer to the driving inclined surface under the drive of external force. The second pin retracts into the second locking hole, and the slider is unlocked in the lower section. Under the action of the main body's own gravity, the slider slides upward to the upper section. The first pin extends from the first locking hole to the outside and engages with the outer hole of the slider and the first locking hole of the upper section of the guide rail, thereby locking the slider in the upper section of the guide rail.

[0025] The above methods enable the slider to be locked and unlocked at the upper and lower ends, thereby allowing the wheels to be extended and retracted.

[0026] Preferably, the side wall of the sliding rod is provided with a first control groove, and a first locking slope is provided on one side of the bottom of the first control groove. This can improve space utilization.

[0027] Preferably, the side wall of the sliding rod is provided with a second control groove, and a second locking slope is provided on one side of the bottom of the second control groove. This can improve space utilization.

[0028] Preferably, the sliding rod is provided with a third control slot corresponding to the control window, and the driving slope is provided on one side of the bottom of the third control slot. This can improve space utilization.

[0029] Preferably, the slider has oblique guide openings at both ends corresponding to the first pin portion and the second pin portion. This facilitates the slider's adaptation to the outer hole by inwardly pressing its outer end when it slides close to the first or second pin portion.

[0030] Preferably, the slider has a through hole, and the guide rail slides through the through hole. This improves the stability of the slider-guide rail connection.

[0031] The beneficial effects of this utility model are:

[0032] The above solution effectively allows the wheel rod to retract or extend relative to the main body, and it can be locked and unlocked. The wheel rod remains in either the retracted or extended state. When extended, the roller travels a greater distance and the center of gravity is lower, but it occupies more space. When retracted, the roller travels a shorter distance, allowing for more stable pushing, with a higher center of gravity and less space occupied. Users can choose to use the solution according to their actual needs. Attached Figure Description

[0033] 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 will be briefly introduced below. Obviously, the drawings described below are only eleven of the present utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram showing the extended wheel rod in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram showing the state of the retractable lever according to an embodiment of the present utility model;

[0036] Figure 3 This is a schematic diagram of the slider and connecting rod according to an embodiment of the present utility model;

[0037] Figure 4 This is one of the exploded views of the guide rail, sliding rod, first locking block, and second locking block according to an embodiment of the present utility model;

[0038] Figure 5 This is a second exploded view of a portion of the guide rail, sliding rod, first locking block, and second locking block according to an embodiment of the present utility model.

[0039] Figure 6 A schematic diagram of an embodiment of this utility model showing the slider in the lower section and the second pin extending to the outer hole;

[0040] Figure 7 A schematic diagram of the present invention showing the slider in the lower section and the second pin retracting from the outer hole;

[0041] Figure 8 A schematic diagram of the slider in the upper section and the first pin about to extend into the outer hole in this embodiment of the present invention;

[0042] Figure 9 A schematic diagram of an embodiment of this utility model showing the slider in the upper section and the first pin extending to the outer hole;

[0043] Figure 10 This utility model embodiment shows a schematic diagram of the rotating plate without the pressing inclined top rod.

[0044] Figure 11 A schematic diagram of the state of the rotating plate pressing the inclined top rod according to an embodiment of this utility model;

[0045] The components are as follows: 1. Guide rail; 2. Slider; 3. Outer hole; 4. Angled guide opening; 5. Wheel rod; 6. Connecting rod; 7. Roller; 8. Guide wheel; 9. Sliding rod; 10. First locking inclined surface; 11. Second locking inclined surface; 12. First locking block; 13. First control inclined surface; 14. First pin rod part; 15. Second locking block; 16. Second control inclined surface; 17. Second pin rod part; 18. Reset elastic element; 19. Control window; 20. Inclined top rod; 21. Driving inclined surface; 22. First locking hole; 23. First locking elastic element; 24. Second locking hole; 25. Second locking elastic element; 26. First control groove; 27. Second control groove; 28. Third control groove; 29. ​​Toggle inclined surface; 30. Rotating plate; 31. Square tube; 32. Positioning rod. Detailed Implementation

[0046] To enhance understanding of this utility model, it will be described in further detail below with reference to the accompanying drawings and embodiments. These embodiments are only used to explain this utility model and do not limit the scope of protection of this utility model.

[0047] Example

[0048] like Figure 1 and Figure 2 As shown, the retractable and deployable wheel leg structure includes a main body, a guide rail 1, a slider 2, a wheel rod 5, and a roller 7;

[0049] The main body is vertically provided with the guide rail 1, and the slider 2 is slidably engaged with the guide rail 1. A locking mechanism is provided between the guide rail 1 and the slider 2, which fixes the slider 2 to the upper or lower section of the guide rail 1; combined with Figure 4 As shown, in this embodiment, the guide rail 1 includes an outer square tube 31 and an inner positioning rod 32. The positioning rod 32 is fixed inside the square tube 31 and is used to set the irregular structure inside the square tube 31.

[0050] The upper ends of the two wheel rods 5 are respectively located on both sides of the guide rail 1, and the lower ends of the two wheel rods 5 are inclined in opposite directions. The wheel rods 5 slide relative to the main body, and are engaged. Figure 3 As shown, the upper end of the wheel rod 5 is connected to the slider 2 via a connecting rod 6, and the lower end of the wheel rod 5 is provided with a roller 7.

[0051] Since the upper end of the wheel rod 5 is connected to the slider 2 via the connecting rod 6, the wheel rod 5 will retract when the slider 2 is located above the guide rail 1, and will extend when the slider 2 is located below the guide rail 1. Because the two wheel rods 5 are inclined relative to each other, when the wheel rod 5 extends, its lower part will be further away, thus lowering the overall center of gravity and better fulfilling its function of moving and bearing weight. When retracted, the distance is shorter, occupying less space. When extended, the roller 7 is further away, resulting in a lower center of gravity, but occupies more space; when retracted, the distance is shorter, the center of gravity is higher, and it occupies less space.

[0052] The main body is provided with several guide wheels 8 that are adapted to the side of the wheel rod 5. The use of guide wheels 8 can reduce the friction between the wheel rod 5 and the main body.

[0053] The lower ends of the two wheel rods 5 are distributed crosswise on the other side of the guide rail 1. This design allows for smaller space occupancy when retracted and a sufficiently large distance between them when extended.

[0054] Combination Figure 5 As shown, the locking mechanism includes a sliding rod 9, a first locking block 12, and a second locking block 15;

[0055] The sliding rod 9 is axially slidably fitted inside the guide rail 1. A reset elastic element 18 is provided between the sliding rod 9 and the guide rail 1. The reset elastic element 18 slides the sliding rod 9 toward the first end of the guide rail 1.

[0056] The guide rail 1 has a control window 19 on its side wall, which is located at the top of the guide rail 1 in this embodiment. The sliding rod 9 has a driving slope 21 on its side wall; the control window 19 is slidably fitted with a sloped top rod 20, the front end of which is positioned corresponding to the driving slope 21; wherein the front slope of the sloped top rod 20 is close to the upper end of the guide rail 1, and the driving slope 21 is adapted to the front slope of the sloped top rod 20.

[0057] Combination Figure 10 and Figure 11As shown, the rear end of the inclined rod 20 is provided with a sliding inclined surface 29, which is located on the outside of the main body. A rotating plate 30 is provided on the side of the main body corresponding to the sliding inclined surface 29. The rotating plate 30 rotates in conjunction with the main body. During the rotation of the rotating plate 30, the edge of the rotating plate 30 contacts the sliding inclined surface 29 and squeezes and pushes the inclined rod 20 to achieve the effect of pushing the inclined rod 20 more easily. The rotating plate 30 can be set to work synchronously with other rotating structures of the main body.

[0058] The first locking block 12 and the second locking block 15 are respectively provided on the upper and lower sections of the guide rail 1.

[0059] The first locking block 12 is provided with a first control slope 13 and a first pin portion 14; the side wall of the sliding rod 9 is provided with a first locking slope 10 adapted to the first control slope 13; the upper side wall of the guide rail 1 is provided with a first locking hole 22 adapted to the first pin portion 14; the first locking block 12 is provided with a first locking elastic element 23 that pushes toward the first locking hole 22; wherein the first control slope 13, the first locking slope 10 and the driving slope 21 have the same inclination direction.

[0060] The second locking block 15 is provided with a second control ramp 16 and a second pin portion 17; the side wall of the sliding rod 9 is provided with a second locking ramp 11 adapted to the second control ramp 16; the lower side wall of the guide rail 1 is provided with a second locking hole 24 adapted to the second pin portion 17; and the second locking block 15 is provided with a second locking elastic member 25 that pushes toward the second locking hole 24.

[0061] In this embodiment, the first locking hole 22 includes two parts: a square tube 31 and a positioning rod 32, and the second locking hole 22 is similar.

[0062] The first locking ramp 10 and the first control ramp 13, and the second locking ramp 11 and the second control ramp 16 are aligned in only one set at a time;

[0063] When the inclined push rod 20 slides away from the end of the driving inclined surface 21;

[0064] Under the push of the reset elastic member 18, the sliding rod 9 slides downward; the first locking slope 10 pushes the first control slope 13, the first locking slope 10 and the first control slope 13 are misaligned, the first locking block 12 slides away from the first locking hole 22, and the first pin portion 14 retracts into the first locking hole 22; the second locking slope 11 and the second control slope 16 are aligned, the second locking elastic member 25 pushes the second locking block 15 to slide into the second locking hole 24, and the second pin portion 17 extends from the second locking hole 24 to the outside; wherein the second control slope 16, the second locking slope 11 and the driving slope 21 are in the opposite direction of inclination.

[0065] When the inclined push rod 20 slides toward one end closer to the driving inclined surface 21;

[0066] Under the push of the inclined rod 20 against the driving inclined surface 21, the sliding rod 9 slides upward; the second locking inclined surface 11 pushes the second control inclined surface 16 to contact and align, the second locking inclined surface 11 pushes the second control inclined surface 16 to contact and disengage, the second locking block 15 slides away from the second locking hole 24, and the second pin portion 17 retracts into the second locking hole 24; the first locking inclined surface 10 contacts and aligns with the first control inclined surface 13, the first locking elastic element 23 pushes the first locking block 12 to slide towards the first locking hole 22, and the first pin portion 14 extends from the first locking hole 22 to the outside;

[0067] The slider 2 is provided with an outer hole 3 that is adapted to the first pin portion 14 or the second pin portion 17.

[0068] In this embodiment, the upper and lower sections of the sidewall of the square tube 31 are respectively provided with a first locking hole 33 and a second locking hole 34 corresponding to the first pin part 14 and the second pin part 17;

[0069] Combination Figure 8 and Figure 9 As shown, in the initial state, the slider 2 is located in the first upper section, and the first pin 14 extending to the outside is engaged with the first locking hole 33 and the outer hole 3. The slider 2 is locked in the upper section of the guide rail 1. At this time, the wheel rod 5 retracts into the main body and is locked.

[0070] Combination Figure 6 and Figure 7As shown, when the wheel rod 5 needs to be extended, the inclined top rod 20 slides away from the end of the driving inclined surface 21; the first pin part 14 retracts into the first locking hole 22, the slider 2 is unlocked in the upper section, and under the action of the wheel rod's own gravity, the slider 2 is driven to slide down to the lower section, the second pin part 17 extends from the second locking hole 24 to the outside, the second pin part 17 is engaged in the second locking hole 34 and the outer hole 3, thereby locking the slider 2 in the lower section of the guide rail 1.

[0071] When the wheel rod 5 needs to be retracted, the inclined top rod 20 slides towards the end close to the driving inclined surface 21 under the drive of external force. The second pin part 17 retracts into the second locking hole 24, and the slider 2 is unlocked in the lower section. Under the action of its own weight, the slider 2 slides upward to the upper section. The first pin part 14 extends from the second locking hole 24 to the outside. The first pin part 14 is engaged in the first locking hole and the outer hole 3, thereby locking the slider 2 in the upper section of the guide rail 1.

[0072] The above methods enable the slider 2 to be locked and unlocked at the upper and lower ends, thereby allowing the wheel legs to be extended and retracted.

[0073] The sliding rod 9 has a first control groove 26 on its side wall, and a first locking slope 10 is provided on one side of the bottom of the first control groove 26. This improves space utilization.

[0074] The sliding rod 9 has a second control groove 27 on its side wall, and a second locking slope 11 is provided on one side of the bottom of the second control groove 27. This improves space utilization.

[0075] The sliding rod 9 is provided with a third control slot 28 corresponding to the control window 19, and the driving inclined surface 21 is provided on one side of the bottom of the third control slot 28. This can improve space utilization.

[0076] The slider 2 has oblique guide openings 4 at both ends corresponding to the first pin portion 14 and the second pin portion 17, respectively. This allows the slider 2 to slide close to the first pin portion 14 or the second pin portion 17, and then squeeze its outer end inward to fit into the outer hole 3.

[0077] The slider 2 is provided with a through hole, and the guide rail 1 slides through the through hole. This improves the stability of the cooperation between the slider 2 and the guide rail 1.

[0078] The beneficial effects of this utility model are:

[0079] The above solution can effectively retract or extend the wheel lever 5 relative to the main body, and can lock and unlock it, keeping the wheel lever 5 in the retracted or extended state.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A retractable and deployable wheel-leg structure, characterized in that, It includes a main body, a guide rail (1), a slider (2), a wheel rod (5), and a roller (7); The main body is vertically provided with the guide rail (1), the slider (2) is slidably engaged with the guide rail (1), and a locking mechanism is provided between the guide rail (1) and the slider (2), the locking mechanism fixing the slider (2) to the upper or lower section of the guide rail (1); The upper ends of the two wheel rods (5) are respectively located on both sides of the guide rail (1), and the lower ends of the two wheel rods (5) are inclined in opposite directions. The wheel rods (5) slide relative to the main body. The upper end of the wheel rod (5) is connected to the slider (2) through the connecting rod (6), and the lower end of the wheel rod (5) is provided with the roller (7).

2. The retractable and deployable wheel leg structure according to claim 1, characterized in that: The main body is provided with a number of guide wheels (8) that are adapted to the side of the wheel rod (5).

3. The retractable and deployable wheel leg structure according to claim 1, characterized in that: The lower ends of the two wheel rods (5) are distributed crosswise to the other side of the guide rail (1).

4. The retractable and deployable wheel leg structure according to claim 1, characterized in that: The locking mechanism includes a sliding rod (9), a first locking block (12), and a second locking block (15); The sliding rod (9) is axially slidably fitted inside the guide rail (1). A reset elastic element (18) is provided between the sliding rod (9) and the guide rail (1). The reset elastic element (18) slides the sliding rod (9) toward the first end of the guide rail (1). The guide rail (1) has a control window (19) on its side wall and a driving inclined surface (21) on its side wall; the control window (19) is slidably fitted with an inclined top rod (20), and the front end of the inclined top rod (20) is provided corresponding to the driving inclined surface (21); The first locking block (12) and the second locking block (15) are respectively set on the upper and lower sections of the guide rail (1). The first locking block (12) is provided with a first control ramp (13) and a first pin (14); the side wall of the sliding rod (9) is provided with a first locking ramp (10) adapted to the first control ramp (13); the upper side wall of the guide rail (1) is provided with a first locking hole (22) adapted to the first pin (14); and the first locking block (12) is provided with a first locking elastic element (23) that pushes into the first locking hole (22). The second locking block (15) is provided with a second control ramp (16) and a second pin (17); the side wall of the sliding rod (9) is provided with a second locking ramp (11) adapted to the second control ramp (16); the lower side wall of the guide rail (1) is provided with a second locking hole (24) adapted to the second pin (17); and the second locking block (15) is provided with a second locking elastic element (25) that pushes into the second locking hole (24). The first locking ramp (10) and the first control ramp (13), and the second locking ramp (11) and the second control ramp (16) are aligned in only one pair at a time; When the inclined push rod (20) slides away from the end of the driving inclined surface (21); Under the push of the reset elastic member (18), the sliding rod (9) slides downward; the first locking slope (10) pushes the first control slope (13), the first locking slope (10) and the first control slope (13) are misaligned, the first locking block (12) slides away from the first locking hole (22), and the first pin part (14) retracts into the first locking hole (22); the second locking slope (11) and the second control slope (16) are aligned, the second locking elastic member (25) pushes the second locking block (15) to slide into the second locking hole (24), and the second pin part (17) extends from the second locking hole (24) to the outside; When the inclined push rod (20) slides toward one end closer to the driving inclined surface (21); Under the push of the inclined rod (20) against the driving inclined surface (21), the sliding rod (9) slides upward; the second locking inclined surface (11) pushes the second control inclined surface (16) to contact and align, the second locking inclined surface (11) pushes the second control inclined surface (16) to contact and misalign, the second locking block (15) slides away from the second locking hole (24), and the second pin part (17) retracts into the second locking hole (24); the first locking inclined surface (10) contacts and aligns with the first control inclined surface (13), the first locking elastic element (23) pushes the first locking block (12) to slide towards the first locking hole (22), and the first pin part (14) extends from the first locking hole (22) to the outside; The slider (2) is provided with an outer hole (3) that is adapted to the first pin part (14) or the second pin part (17).

5. The retractable and deployable wheel leg structure according to claim 4, characterized in that: The sliding rod (9) has a first control groove (26) on its side wall, and a first locking slope (10) is provided on one side of the bottom of the first control groove (26).

6. The retractable and deployable wheel leg structure according to claim 4, characterized in that: The sliding rod (9) has a second control groove (27) on its side wall, and a second locking slope (11) is provided on one side of the bottom of the second control groove (27).

7. The retractable and deployable wheel leg structure according to claim 4, characterized in that: The sliding rod (9) is provided with a third control groove (28) corresponding to the control window (19), and the driving inclined surface (21) is provided on one side of the bottom of the third control groove (28).

8. The retractable and deployable wheel leg structure according to claim 4, characterized in that: The slider (2) has oblique guides (4) at both ends corresponding to the first pin part (14) and the second pin part (17).

9. The retractable and deployable wheel leg structure according to claim 1, characterized in that: The slider (2) is provided with a through hole, and the guide rail (1) slides through the through hole.

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