Telescopic wheel mechanism and box

Abstract

This disclosure relates to the field of wheel telescopic device technology, providing a telescopic wheel mechanism and housing. The telescopic wheel mechanism includes a connecting groove extending along a first direction, a connecting post on a pull rod, the connecting post being slidably disposed within the connecting groove, and the pull rod capable of rotating relative to a mounting base around the connecting post. A wheel assembly is rotatably disposed on the mounting base, having extended and retracted positions. A limiting rod connects the pull rod and the wheel assembly, and a positioning groove is provided on the mounting base. The limiting rod slides into the positioning groove, having a locked position and an unlocked position within the positioning groove. The pull rod rotates relative to the mounting base around the connecting post to switch the limiting rod between the locked and unlocked positions. When the limiting rod is in the unlocked position, the pull rod slides relative to the mounting base along the first direction to switch the wheel assembly between the extended and retracted positions, allowing the pull rod to conveniently control the extension, retraction, and locking of the wheel assembly.

Description

Technical Field

[0001] This disclosure relates to the field of wheel telescopic device technology, and in particular to a telescopic wheel mechanism and housing. Background Technology

[0002] The widespread use of vehicles has led to an increasing number of scenarios where vehicles are used. Items such as pet carriers, storage boxes, travel bags, and large storage boxes often need to meet different needs for both in-vehicle transport and daily use. In daily life or during transport, these items typically require the use of casters at the bottom for easier movement. If the casters are directly fixed to the container, it is difficult to secure it in a vehicle, resulting in less contact area between the container and the car and less sliding friction. This makes it susceptible to movement under strong impact, potentially endangering the lives of passengers inside the vehicle.

[0003] To secure the box, existing pulley structures at the bottom of the box are mostly simple disassembly or folding structures. When users put the box with pulleys into the trunk of their vehicle, they often need to directly remove or fold the pulleys to retract them and ensure the stability of the box and the vehicle. However, this operation of retracting the pulleys at the bottom of the box is laborious and uncomfortable, affecting the user experience. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this disclosure provides a telescopic wheel mechanism and a housing.

[0005] This disclosure provides a telescopic wheel mechanism, including a mounting base, a wheel assembly, a pull rod, and a limiting rod;

[0006] The mounting base is provided with a connecting groove extending in a first direction, and the pull rod is provided with a connecting post. The connecting post is slidably disposed in the connecting groove, and the pull rod can rotate relative to the mounting base around the connecting post.

[0007] The wheel assembly is rotatably mounted on the mounting base, and the wheel assembly has an extended position extending out of the mounting base and a retracted position retracting into the mounting base;

[0008] The limiting rod is connected between the pull rod and the wheel assembly. The mounting base is provided with a positioning groove. The limiting rod slides in the positioning groove. The limiting rod has a locked position and an unlocked position in the positioning groove.

[0009] The pull rod rotates relative to the mounting base around the connecting column to drive the limiting rod to switch between the locked position and the unlocked position. When the limiting rod is in the unlocked position, the pull rod slides relative to the mounting base in the first direction to drive the wheel assembly to switch between the extended position and the retracted position.

[0010] Optionally, the positioning groove includes a sliding groove segment and a limiting groove segment that are interconnected, the sliding groove segment and the limiting groove segment are arranged at an angle, and the sliding groove segment is parallel to the extending direction of the connecting groove;

[0011] When the limiting rod is in the limiting groove section, it engages with the limiting groove section to limit the sliding of the pull rod relative to the mounting base in the first direction.

[0012] Optionally, the connecting groove is disposed on the side of the mounting base, the connecting post is located in the middle region of the pull rod along the first direction, one end of the pull rod along the first direction is formed with a handle, and the other end of the pull rod along the first direction is connected to the limiting rod.

[0013] Optionally, the limiting rod includes a horizontal bar and a diagonal bar connected to each other. One end of the horizontal bar is slidably connected to the positioning groove, and the other end is rotatably connected to the wheel assembly. One end of the diagonal bar is connected to the pull rod, and the other end is movably connected to the middle area of ​​the horizontal bar.

[0014] Optionally, a connecting rod is further provided between the pull rod and the wheel assembly, with one end of the connecting rod rotatably connected to the pull rod and the other end rotatably connected to the wheel assembly.

[0015] Optionally, the connecting rod includes a first rod portion and a second rod portion connected to each other, the first rod portion being rotatably connected to the pull rod, the second rod portion being rotatably connected to the wheel assembly, and the first rod portion and the second rod portion being set at an angle.

[0016] Optionally, there are two wheel assemblies and two limiting rods. The pull rod has two connecting ends, which are movably connected to the opposite sides of the mounting base. Each of the opposite sides of the mounting base is provided with a wheel assembly and a limiting rod, and the two limiting rods are rotatably connected to the two connecting ends of the pull rod.

[0017] Optionally, the wheel assembly includes two rollers, which are spaced apart along the first direction. Each roller is rotatably connected to the side of the mounting base. The limiting rod is rotatably connected to one of the rollers. A transmission rod is provided between the two rollers, and both ends of the transmission rod are rotatably connected to the two rollers respectively.

[0018] Optionally, the roller component includes a roller and a rotating rod, the roller is mounted on one end of the rotating rod, the other end of the rotating rod is rotatably connected to the side of the mounting base, and the limiting rod is rotatably connected to the rotating rod.

[0019] Optionally, an elastic element is provided between the wheel assembly and the mounting base. The two ends of the elastic element are respectively connected to the wheel assembly and the mounting base. When the wheel assembly is in the extended position, the elastic element is in an extended state, and when the wheel assembly is in the retracted position, the elastic element is in a free state without extension or retraction.

[0020] This disclosure also provides a housing, including an outer shell and a telescopic wheel mechanism as described in any of the preceding claims, wherein the bottom of the outer shell is provided with an installation space, the telescopic wheel mechanism is disposed in the installation space, the wheel assembly extends out of the installation space when it is in the extended position, and retracts into the installation space when it is in the retracted position.

[0021] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0022] The telescopic wheel mechanism and housing disclosed herein include a mounting base, a wheel assembly, a pull rod, and a limiting rod. The mounting base has a connecting groove extending in a first direction, and the pull rod has a connecting post slidably disposed within the connecting groove. The pull rod is rotatable relative to the mounting base around the connecting post. The wheel assembly is rotatably disposed on the mounting base and has an extended position extending from the mounting base and a retracted position retracting from the mounting base. The limiting rod connects the pull rod and the wheel assembly. The mounting base has a positioning groove, and the limiting rod slidably engages with the positioning groove, having a locked position and an unlocked position within the positioning groove. The pull rod rotates relative to the mounting base around the connecting post. The limit lever switches between a locked position and an unlocked position. When the limit lever is in the locked position, it restricts the rotation of the wheel assembly, thus keeping the wheel assembly extended from the mounting base and acting as a pulley for the mounting base. When the limit lever is in the unlocked position, the lever slides relative to the mounting base in a first direction, thereby switching the wheel assembly between an extended position and a retracted position. This allows the user to control the extension and retraction of the wheel assembly on the mounting base by sliding and rotating the lever, while simultaneously controlling the locking and unlocking of the wheel assembly by the limit lever. This improves the convenience of controlling the extension and retraction of the wheel assembly and enhances the user experience. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0024] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1This is one of the structural schematic diagrams of the telescopic wheel mechanism in the extended position according to an embodiment of the present disclosure;

[0026] Figure 2 This is a second schematic diagram of the telescopic wheel mechanism in the extended position according to an embodiment of the present disclosure;

[0027] Figure 3 This is a schematic diagram of the retractable wheel mechanism in the retracted position according to an embodiment of the present disclosure;

[0028] Figure 4 This is a schematic diagram of the structure of the roller component described in the embodiments of this disclosure;

[0029] Figure 5 This is a schematic diagram of the structure of the roller described in an embodiment of this disclosure;

[0030] Figure 6 This is a schematic diagram of the structure of the box described in an embodiment of this disclosure.

[0031] The components include: 1. Mounting base; 11. Positioning groove; 111. Sliding groove section; 112. Limiting groove section; 12. Connecting groove; 2. Wheel assembly; 21. Rotating rod; 22. Roller; 23. Transmission rod; 24. Elastic element; 3. Pull rod; 31. Connecting column; 4. Limiting rod; 41. Horizontal bar; 42. Diagonal bar; 5. Connecting rod; 51. First rod section; 52. Second rod section; 6. Outer shell. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0033] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0034] Reference Figures 1 to 6 As shown, this embodiment of the present disclosure provides a telescopic wheel mechanism, including a mounting base 1, a wheel assembly 2, a pull rod 3, and a limiting rod 4;

[0035] The mounting base 1 is provided with a connecting groove 12 extending in the first direction, and the pull rod 3 is provided with a connecting post 31. The connecting post 31 is slidably disposed in the connecting groove 12, and the pull rod 3 can rotate relative to the mounting base 1 around the connecting post 31.

[0036] The wheel assembly 2 is rotatably mounted on the mounting base 1, and the wheel assembly 2 has an extended position extending out of the mounting base 1 and a retracted position retracting from the mounting base 1;

[0037] The limiting rod 4 is connected between the pull rod 3 and the wheel assembly 2. The mounting base 1 is provided with a positioning groove 11. The limiting rod 4 slides in the positioning groove 11. The limiting rod 4 has a locked position and an unlocked position in the positioning groove 11.

[0038] The pull rod 3 rotates relative to the mounting base 1 around the connecting column 31 to drive the limiting rod 4 to switch between the locked position and the unlocked position. When the limiting rod 4 is in the unlocked position, the pull rod 3 slides relative to the mounting base 1 in the first direction to drive the wheel assembly 2 to switch between the extended position and the retracted position.

[0039] Specifically, the mounting base 1 can be selected as two parallel rectangular panels, or it can be a rectangular shell. The mounting base 1 is mainly used to support the structure of the wheel assembly 2, the pull rod 3, and the limiting rod 4. The mounting base 1 can be connected to other boxes by bolts or welding, so that the telescopic wheel mechanism can be installed on the box. When the wheel assembly 2 is placed on the ground, the first direction is the length direction of the mounting base 1 parallel to the ground, the vertical direction of the mounting base 1 is the height direction, and the width direction of the mounting base 1 is perpendicular to the first direction and the height direction of the mounting base 1. The pull rod 3 and the wheel assembly 2 can be arranged at intervals along the first direction on the mounting base 1, and the pull rod 3 is set at the edge of the mounting base 1 along the first direction to facilitate the user to pull the pull rod 3.

[0040] The aforementioned pull rod 3 can be a rectangular rod body. One end of the pull rod 3 is movably connected to the connecting groove 12 on the side of the mounting base 1, and the other end extends away from the mounting base 1 along the first direction. The side of the mounting base 1 can be provided with a through hole extending along the first direction as the connecting groove 12. The connecting post 31 can be a cylindrical structure, and the connecting post 31 is located at the middle position of the pull rod 3, so that the connecting post 31 of the pull rod 3 is inserted into the through hole and connected to the connecting groove 12. There is a gap between the connecting post 31 and the inner wall of the connecting groove 12, so that the connecting post 31 can rotate around the axis of the connecting post 31 in the connecting groove 12, thereby allowing the pull rod 3 to rotate relative to the mounting base 1 around the axis of the connecting post 31. Alternatively, the side of the mounting base 1 can be provided with a groove extending along the first direction as the connecting groove 12, and the connecting post 31 is inserted into the groove. The connection post 31 and the connecting groove 12 can be connected in a circular fashion. The inner walls of the mounting base 1 and the connecting rod 2 have a gap, allowing the connecting rod 31 to slide along the groove and rotate around it. Alternatively, the mounting base 1 can have a groove extending in the first direction as the connecting groove 12, into which the connecting rod 31 is inserted. The inner walls of the connecting rod 31 and the connecting groove 12 can have a gap, allowing the connecting rod 31 to slide along the groove and rotate around it. Alternatively, the connecting rod 31 can be a rectangular column with a rotating shaft. The axis of the rotating shaft is the axis of the connecting rod 31. The rotating shaft is rotatably connected to the pull rod 3, and the connecting rod 31 is slidably connected to the connecting groove 12, allowing the connecting rod 31 to slide in the connecting groove 12. The pull rod 3 rotates through the rotating shaft of the connecting rod 31, thus enabling the pull rod 3 to slide relative to the mounting base 1 in the first direction and rotate relative to the mounting base 1.

[0041] Understandably, along the height direction of the mounting base 1, the pull rod 3 can be set below the positioning groove 11 or above the positioning groove 11, as long as the pull rod 3 can drive the end of the limiting rod 4 to switch between the locked position and the unlocked position when it rotates.

[0042] The aforementioned limiting rod 4 can be movably connected at one end to the wheel assembly 2 and slidably connected at the other end to the positioning groove 11. The pull rod 3 is connected to the limiting rod 4 via a rod member, with both ends of the rod member rotatably connected to the pull rod 3 and the limiting rod 4 respectively. This allows the pull rod 3 to apply a driving force to the limiting rod 4 when it rotates, causing the pull rod 3 to move the limiting rod 4 between the locked and unlocked positions of the positioning groove 11. When the connecting post 31 is located in the middle of the pull rod 3, the end of the pull rod 3 away from the wheel assembly 2 moves downwards, while the end of the pull rod 3 near the wheel assembly 2 moves upwards. When one end of the wheel assembly 2 moves downward, the end of the pull rod 3 near the wheel assembly 2 is rotatably connected to the limiting rod 4. The pull rod 3 can apply a driving force to the limiting rod 4 by rotating around the connecting post 31, so that the limiting rod 4 moves between the locked position and the unlocked position. Of course, when the connecting post 31 is set at the end of the pull rod 3 near the wheel assembly 2, the limiting rod 4 can be connected to the middle of the pull rod 3. When the pull rod 3 rotates around the connecting post 31, it will change the position of the connection between the limiting rod 4 and the pull rod 3 in the height direction of the mounting base 1, so that the pull rod 3 can drive the limiting rod 4 to move between the locked position and the unlocked position by applying a driving force to the limiting rod 4.

[0043] The aforementioned positioning groove 11 can be extended along the first direction on the side of the mounting base 1, and the end of the positioning groove 11 is provided with a limiting notch perpendicular to the first direction. The end of the limiting rod 4 can engage with the limiting notch, so that the end of the positioning groove 11 with the limiting notch is in a locked position. The rotating end of the pull rod 3, which can rotate relative to the mounting base 1, is connected to the limiting rod 4 through a connecting rod. When the limiting rod 4 is in the locked position, the end of the limiting rod 4 is in the limiting notch of the locking position of the positioning groove 11, so that the limiting notch restricts the movement of the limiting rod 4 in the first direction, thereby causing the wheel assembly 2 to be subjected to a force along the first direction. The engagement of the limiting rod 4 and the limiting notch prevents the wheel assembly 2 from rotating from the extended position to the retracted position, thus achieving locking. The pull rod 3 rotates relative to the mounting base 1, and the rotating end applies a driving force perpendicular to the first direction to the rod through the connecting rod, causing the limiting rod 4 to disengage from the limiting notch. At this time, the end of the limiting rod 4 can slide in the limiting groove. The pull rod 3 moves along the first direction, causing the limiting rod 4 to slide in the limiting groove. While the limiting rod 4 moves, it also causes the wheel assembly 2 to rotate. The unlocking position is when the limiting rod 4 can slide in the positioning groove 11 so that the wheel assembly 2 can rotate relative to the mounting base 1.

[0044] The extended position is the position where the wheel assembly 2 can contact the ground and roll when the mounting base 1 is placed on the ground. At this time, the limiting rod 4 is in the locked position, so that the wheel assembly 2 will not rotate towards the mounting base 1 when rolling on the ground. The retracted position is the position where the wheel assembly 2 rotates relative to the mounting base 1 and is close to the mounting base 1, so that when the mounting base 1 is placed on the ground, the wheel assembly 2 cannot contact the ground and roll. At this time, the limiting rod 4 is in the unlocked position, and the wheel assembly 2 is in the unlocked state. The wheel assembly 2 can rotate relative to the mounting base 1 under the control of the pull rod 3 to control the movement and switching of the wheel assembly 2 between the extended and retracted positions.

[0045] In practical use, the mounting base 1 is in a stationary state, the wheel assembly 2 is in the retracted position, and the limiting rod 4 is in the unlocked position. When the wheel assembly 2 needs to be rolled out, the pull rod 3 is pushed towards the wheel assembly 2 in the first direction, causing the wheel assembly 2 to rotate relative to the mounting base 1 under the push of the pull rod 3. At this time, the limiting rod 4 slides along the positioning groove 11. When the wheel part of the wheel assembly 2 rotates away from the mounting base 1 until the wheel assembly 2 extends out of the mounting base 1 and reaches the extended position, the pull rod 3 is rotated, causing the end of the pull rod 3 connected to the limiting rod 4 to drive the limiting rod 4 into the locking position of the positioning groove 11. At this time, the wheel assembly 2 remains stable due to the cooperation of the locking position of the limiting rod 4 and the positioning groove 11, so that the wheel assembly 2 will not rotate relative to the mounting base 1 due to the force in the first direction, so that the wheel assembly 2 can support the mounting base 1. At the same time, the wheel part of the wheel assembly 2 can roll on the ground to facilitate the movement of the mounting base 1 on the ground.

[0046] The telescopic wheel mechanism provided in this embodiment includes a mounting base 1, a wheel assembly 2, a pull rod 3, and a limiting rod 4. The mounting base 1 has a connecting groove 12 extending in a first direction. The pull rod 3 has a connecting post 31, which is slidably disposed within the connecting groove 12, and the pull rod 3 is rotatable relative to the mounting base 1 around the connecting post 31. The wheel assembly 2 is rotatably disposed on the mounting base 1, and has an extended position extending out of the mounting base 1 and a retracted position retracting from the mounting base 1. The limiting rod 4 connects the pull rod 3 and the wheel assembly 2. The mounting base 1 has a positioning groove 11, and the limiting rod 4 slides within the positioning groove 11, having a locked position and an unlocked position within the positioning groove 11. The pull rod 3 rotates around the connecting post 31... Rotating the mounting base 1 causes the limiting rod 4 to switch between a locked position and an unlocked position. When the limiting rod 4 is in the locked position, it restricts the rotation of the wheel assembly 2 relative to the mounting base 1, thus keeping the wheel assembly 2 extended from the mounting base 1 and acting as a pulley for the mounting base 1. When the limiting rod 4 is in the unlocked position, the pull rod 3 slides relative to the mounting base 1 in a first direction, causing the wheel assembly 2 to switch between an extended position and a retracted position. This allows the user to control the extension and retraction of the wheel assembly 2 on the mounting base 1 by sliding and rotating the pull rod 3, while simultaneously controlling the locking and unlocking of the wheel assembly 2 by the limiting rod 4. This improves the convenience of controlling the extension and retraction of the wheel assembly 2 and enhances the user experience.

[0047] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the positioning groove 11 includes a sliding groove section 111 and a limiting groove section 112 that are connected to each other. The sliding groove section 111 and the limiting groove section 112 are arranged at an angle, and the sliding groove section 111 is parallel to the sliding direction of the pull rod 3, that is, the sliding groove section 111 is parallel to the extension direction of the connecting groove 12.

[0048] The limiting rod 4 is slidably connected to the positioning groove 11, and when the limiting rod 4 is in the limiting groove section 112, it is limited and engaged with the limiting groove section 112 to restrict the sliding of the pull rod 3 relative to the mounting base 1.

[0049] Specifically, the sliding groove segment 111 and the limiting groove segment 112 can be straight grooves. The sliding groove segment 111 can extend along the first direction, and the limiting groove segment 112 can be located at the end of the sliding groove segment 111. Alternatively, the limiting groove segment 112 can be located at the end of the sliding groove segment 111 near the wheel assembly 2 along the first direction, and the extension direction of the limiting groove segment 112 is perpendicular to the extension direction of the sliding groove segment 111, so that the positioning groove 11 forms an L-shaped groove. This causes the pull rod 3 to rotate, driving the end of the limiting rod 4 away from the wheel assembly 2 to move from the limiting groove segment 112 to the sliding groove segment 111. Then, the pull rod 3 moves along the first direction toward the end away from the wheel assembly 2, and the end of the limiting rod 4 away from the wheel assembly 2 moves along the sliding groove segment 111 toward the direction away from the wheel assembly 2, so that the wheel assembly 2 rotates to the retracted position as the limiting rod 4 moves.

[0050] The included angle between the aforementioned limiting groove 112 and sliding groove 111 can be 90° or 60°, as long as the movement of the limiting rod 4 in the limiting groove 112 along the first direction is restricted, thus preventing the wheel assembly 2 from rotating, thereby achieving the limiting engagement between the limiting groove 112 and the limiting rod 4. The limiting groove 112 can be perpendicular to the first direction, so that when the wheel assembly 2 is subjected to a force along the first direction, the end of the limiting rod 4 is restricted by the inner wall of the limiting groove 112 and cannot move, preventing the wheel assembly 2 from rotating. When the limiting rod 4 is located in the limiting groove 112, the limiting rod 4 is in the locked position, and the user can push the mounting base 1 to make the wheel in the wheel assembly 2 roll. The friction force generated by the wheel assembly 2 in the first direction during rolling is due to the limiting groove. The limiting action of segment 112 will not cause the wheel assembly 2 to rotate. When the pull rod 3 rotates, the pull rod 3 will apply a driving force perpendicular to the first direction to the limiting rod 4, so that the end of the limiting rod 4 moves along the limiting groove segment 112. By the different rotation directions of the pull rod 3, the limiting rod 4 can move up or down in the limiting groove segment 112. When the limiting rod 4 moves to the connection between the limiting groove segment 112 and the sliding groove segment 111, the limiting of the limiting rod 4 in the first direction disappears. The position from which the limiting rod 4 disappears in the first direction is the unlocking position of the positioning groove 11. When the limiting rod 4 is in the unlocking position, the limiting rod 4 moves in the first direction away from or towards the wheel assembly 2, so that the wheel assembly 2 can rotate relative to the mounting base 1 under the drive of the limiting rod 4.

[0051] The aforementioned limiting rod 4 can be composed of two straight rods. One end of one straight rod has a cylindrical protrusion that can be inserted into the positioning groove 11, allowing the cylindrical protrusion to slide in the positioning groove 11. The other end of the straight rod is rotatably connected to the wheel assembly 2. The two ends of the other straight rod are rotatably connected to the pull rod 3 and the straight rod with the cylindrical protrusion, respectively, serving as a connecting rod. The connecting rod is connected to the part of the pull rod 3 away from the rotation center relative to the mounting base 1. Thus, when the pull rod 3 rotates relative to the mounting base 1, the pull rod 3 can apply a force perpendicular to the first direction to the straight rod with the cylindrical protrusion through the connecting rod. Depending on the rotation direction of the pull rod 3, the cylindrical protrusion can be subjected to a force in the limiting groove section 112 towards the sliding groove section 111, or the cylindrical protrusion can be subjected to a force in the sliding groove section 111 towards the limiting groove section 112. Thus, when the pull rod 3 rotates, it can drive the end of the limiting rod 4 to move between the limiting groove section 112 and the sliding groove section 111.

[0052] The telescopic wheel mechanism includes a mounting base 1, a wheel assembly 2, a pull rod 3, and a limiting rod 4. The pull rod 3 is slidably disposed on the side of the mounting base 1 along a first direction and is rotatable relative to the mounting base 1. The wheel assembly 2 is rotatably disposed on the side of the mounting base 1. The mounting base 1 is provided with a positioning groove 11, which includes a sliding groove section 111 and a limiting groove section 112. One end of the limiting rod 4 is slidably connected to the positioning groove 11, and the other end is rotatably connected to the wheel assembly 2. The limiting groove section 112 restricts the limiting rod. The end of 4 moves along the first direction, so that the wheel assembly 2 will not rotate when it is subjected to frictional force along the first direction, thus maintaining the stability of the wheel assembly 2 when it rolls. The pull rod 3 rotates relative to the mounting base 1 to drive the end of the limiting rod 4 to move between the limiting groove section 112 and the sliding groove section 111, thereby controlling whether the wheel assembly 2 can rotate relative to the mounting base 1. The pull rod 3 slides along the first direction to drive the wheel assembly 2 to switch between the extended position away from the mounting base 1 and the retracted position close to the mounting base 1.

[0053] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the connecting groove 12 is provided on the side of the mounting base 1, the connecting post 31 is located in the middle region of the pull rod 3 along the first direction, one end of the pull rod 3 along the first direction is formed with a hand-held part, and the other end of the pull rod 3 along the first direction is connected to the limiting rod 4.

[0054] Specifically, the mounting base 1 can be provided with a through hole extending in the first direction as the connecting groove 12, and the connecting post 31 can be a cylindrical structure, so that the connecting post 31 of the pull rod 3 is inserted into the through hole and connected to the connecting groove 12, and there is a gap between the connecting post 31 and the inner wall of the connecting groove 12, so that the connecting post 31 can rotate around the axis of the connecting post 31 in the connecting groove 12, so that the pull rod 3 can rotate relative to the mounting base 1 around the axis of the connecting post 31; of course, the mounting base 1 can also be provided with a groove extending in the first direction as the connecting groove 12.

[0055] One end of the aforementioned pull rod 3 can be selected as a connecting end for rotatable connection with the limiting rod 4. The pull rod 3 extends along the first direction away from the wheel assembly 2 as a handhold suitable for user gripping. The middle region is the area of ​​the pull rod 3 along the first direction between the handhold and the connecting end. The pull rod 3 can be positioned in the middle region near the connecting end, so that the user can apply driving force along the height direction of the mounting base 1 after holding the handhold to make the pull rod 3 rotate around the axis of the connecting post 31. This rotation of the pull rod 3 will drive the limiting rod 4 to move between the limiting groove section 112 and the sliding groove section 111. Alternatively, the connecting post 31 can be positioned at the midpoint of the length of the pull rod 3 along the first direction.

[0056] When the limiting groove section 112 is located below the sliding groove section 111, the hand-held part rotates downward along the height direction of the mounting base 1, and the connecting end moves upward, so that the pull rod 3 applies an upward driving force to the limiting rod 4, causing the limiting rod 4 to move from the limiting groove section 112 toward the sliding groove section 111. The hand-held part rotates upward along the height direction of the mounting base 1, and the connecting section moves downward, so that the pull rod 3 applies a downward driving force to the limiting rod 4, allowing the limiting rod 4 to move from the sliding groove section 111 into the limiting groove section 112.

[0057] By providing a connecting groove 12 on the side of the mounting base 1, and a connecting post 31 located in the middle region of the pull rod 3 along the first direction, a handle is formed at one end of the pull rod 3 along the first direction, and the other end of the pull rod 3 along the first direction is connected to the limiting rod 4. While the pull rod 3 is slidably connected to the connecting groove 12 through the connecting post 31, the pull rod 3 can also rotate around the axis of the connecting post 31, so that the pull rod 3 can rotate relative to the mounting base 1 at different positions along the first direction in the connecting groove 12. This allows the pull rod 3 to apply a driving force different from the first direction to the limiting rod 4 by rotating around the axis of the connecting post 31 at any position in the connecting groove 12, thereby moving the end of the limiting rod 4 between the locked position and the unlocked position, improving the convenience of the pull rod 3 applying driving force to the limiting rod 4.

[0058] In some embodiments, the sliding groove segment 111 is disposed along a first direction, the limiting groove segment 112 is disposed along the height direction of the mounting base 1, and the limiting groove segment 112 is located below the sliding groove segment 111.

[0059] Specifically, the sliding groove segment 111 can be extended on the side of the mounting base 1, and the limiting groove segment 112 can be extended on the side of the mounting base 1 along the height direction of the mounting base 1. The limiting groove segment 112 can be set at the end of the sliding groove segment 111 to form an L-shaped positioning groove 11. Alternatively, the limiting groove segment 112 can be set in the middle area of ​​the sliding groove segment 111 to form a T-shaped positioning groove 11. When the positioning groove 11 is an L-shaped groove, the positioning groove 11 can be located between the pull rod 3 and the wheel assembly 2 along the first direction, so that the limiting groove segment 112 is set at the end of the sliding groove segment 111 along the first direction near the wheel assembly 2. This allows the end of the limiting rod 4 to enter the sliding groove segment 111 from the limiting groove segment 112, and the end of the limiting rod 4 can only slide in the sliding groove segment 111 along the first direction away from the wheel assembly 2, which facilitates the limiting rod 4 to drive the wheel assembly 2 to rotate.

[0060] By setting the sliding groove section 111 along the first direction and the limiting groove section 112 along the height direction of the mounting base 1, and setting the limiting groove section 112 below the sliding groove section 111, when the end of the limiting rod 4 is located in the limiting groove section 112, it can be stably located inside the limiting groove section 112 under the action of gravity. When the wheel assembly 2 is subjected to a force along the first direction and has a tendency to rotate, the end of the limiting rod 4 will move downward due to the action of gravity. Therefore, the limiting rod 4 can be stably located in the limiting groove section 112, thereby limiting the rotation of the wheel assembly 2.

[0061] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the limiting rod 4 includes a horizontal rod 41 and a diagonal rod 42 connected to each other. One end of the horizontal rod 41 is slidably connected to the positioning groove 11, and the other end is rotatably connected to the wheel assembly 2. One end of the diagonal rod 42 is connected to the pull rod 3, and the other end is movably connected to the middle area of ​​the horizontal rod 41.

[0062] Specifically, both the crossbar 41 and the diagonal bar 42 can be straight rods. One end of the crossbar 41 has a slider or a cylindrical protrusion, which is inserted into the positioning groove 11, thereby allowing the crossbar 41 to slide in the positioning groove 11. The other end of the crossbar 41 can be rotatably connected to the wheel assembly 2 using bolts or rivets. Both ends of the diagonal bar 42 can have through holes, through which bolts, rivets, or screws are passed, allowing both ends of the diagonal bar 42 to be rotatably connected to the wheel assembly 2 and the pull rod 3, respectively. The diagonal bar 42 is connected to the end of the pull rod 3 closest to the wheel assembly 2, allowing the user to grip the end of the pull rod 3 furthest from the wheel assembly 2 around the axis of the connecting post 31. When the pull rod 3 is rotated, the end connected to the diagonal rod 42 will also rotate around the axis of the connecting column 31, thereby causing the pull rod 3 to apply a force to the diagonal rod 42 along the height direction of the mounting base 1, so that the diagonal rod 42 drives the end of the crossbar 41 to move between the limiting groove section 112 and the sliding groove section 111; the middle area of ​​the crossbar 41 can be selected as the area between the end of the crossbar 41 connected to the positioning groove 11 and the end connected to the wheel assembly 2; the connection between the middle area of ​​the diagonal rod 42 and the crossbar 41 is beneficial to the crossbar 41 moving more easily under the action of the force when the pull rod 3 rotates and applies a force to the crossbar 41 along the height direction of the mounting base 1, so that the crossbar 41 can move in the limiting groove section 112 even when the user rotates the pull rod 3 with a small force.

[0063] By setting a limiting rod 4 including a horizontal rod 41 and a diagonal rod 42, one end of the horizontal rod 41 is connected to the positioning groove 11, and the other end is rotatably connected to the wheel assembly 2, so that when the wheel assembly 2 rotates, it can drive the horizontal rod 41 to move in the positioning groove 11. One end of the diagonal rod 42 is connected to the pull rod 3, and the other end of the diagonal rod 42 is rotatably connected to the middle area of ​​the horizontal rod 41, so that when the diagonal rod 42 is driven by the pull rod 3 to move in the height direction of the mounting base 1, the diagonal rod 42 applies external force to the middle area of ​​the horizontal rod 41, which can more easily drive the horizontal rod 41 to move, thereby reducing the external force applied by the user to the pull rod 3, and making it convenient for the user to control the switching operation of the limiting rod 4 between the unlocked position and the locked position.

[0064] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, a connecting rod 5 is also provided between the pull rod 3 and the wheel assembly 2. One end of the connecting rod 5 is rotatably connected to the pull rod 3, and the other end is rotatably connected to the wheel assembly 2.

[0065] Specifically, the connecting rod 5 can be a straight rod or a bent rod, as long as both ends of the connecting rod 5 are rotatably connected to the pull rod 3 and the wheel assembly 2 respectively. When the pull rod 3 moves in the first direction, the connecting rod 5 can apply a driving force in the first direction to the wheel assembly 2. Since the limiting rod 4 is rotatably connected to the pull rod 3, the positioning groove 11 and the wheel assembly 2, when the pull rod 3 moves in the first direction and drives the wheel assembly 2 to rotate relative to the mounting seat 1, the force of the pull rod 3 on the wheel assembly 2 will be lost in the rotation of the limiting rod 4. In addition, the limiting rod 4 abuts against the inner wall of the positioning groove 11 under the push of the pull rod 3, causing some of the driving force on the pull rod 3 to be lost in friction. Therefore, the connecting rod 5 is used to directly connect the pull rod 3 and the wheel assembly 2. When the pull rod 3 moves in the first direction, it directly applies a driving force to the wheel assembly 2 to make the wheel assembly 2 rotate, reducing the external force required to drive the wheel assembly 2 to rotate.

[0066] By setting a connecting rod 5 between the pull rod 3 and the wheel assembly 2, the pull rod 3 can directly apply driving force to the wheel assembly 2 through the connecting rod 5. This avoids the reduction in the transmission efficiency of driving force due to the rotation of the limiting rod 4 when the pull rod 3 applies driving force to the wheel assembly 2 through the lower limiting rod 4. The connecting rod 5 connects the pull rod 3 and the wheel assembly 2, which can improve the stability of the wheel assembly 2 when it rotates.

[0067] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, in some embodiments, the connecting rod 5 includes a first rod portion 51 and a second rod portion 52 connected to each other. The first rod portion 51 is rotatably connected to the pull rod 3, and the second rod portion 52 is rotatably connected to the wheel assembly 2. The first rod portion 51 and the second rod portion 52 are arranged at an angle.

[0068] Specifically, both the first rod 51 and the second rod 52 can be straight rods. The included angle between the first rod 51 and the second rod 52 can be 90° or 120°. The opening of the included angle between the first rod 51 and the second rod 52 is set downward, that is, the first rod 51 is set upward relative to the first direction along the height direction of the mounting base 1, and the second rod 52 is set upward relative to the first direction along the height direction of the mounting base 1. This provides a certain clearance space below the first rod 51 and the second rod 52. When the wheel assembly 2 is in the second state, since the wheel assembly 2 is close to the mounting base 1, the clearance space in the downward direction of the first rod 51 and the second rod 52 can avoid the wheel part at the bottom of the wheel assembly 2, thus avoiding interference of the connecting rod 5 when the wheel assembly 2 rotates.

[0069] By setting the connecting rod 5 to include a first rod portion 51 and a second rod portion 52, and having a set angle between the first rod portion 51 and the second rod portion 52, the first rod portion 51 and the second rod portion 52 can avoid the wheel assembly 2 when the wheel assembly 2 rotates, thus preventing the connecting rod 5 from interfering with the wheel assembly 2 when the wheel assembly 2 rotates.

[0070] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, there are two positioning grooves 11, two wheel assemblies 2, and two limiting rods 4. The pull rod 3 has two connecting ends, and the two connecting ends of the pull rod 3 are movably connected to the opposite sides of the mounting base 1. The opposite sides of the mounting base 1 are respectively provided with positioning grooves 11, wheel assemblies 2, and limiting rods 4, and the two limiting rods 4 located on both sides of the mounting base 1 are rotatably connected to the two connecting ends of the pull rod 3.

[0071] Specifically, when the mounting base 1 is selected as two panels facing each other, the first direction is the length direction of the panel, the height direction of the panel is the height direction of the mounting base 1, and the width direction of the mounting base 1 is the direction from one panel to the other. The two positioning grooves 11, the wheel assembly 2, and the limiting rod 4 are respectively set on the opposite side of the two panels. Alternatively, the two positioning grooves 11, the wheel assembly 2, and the limiting rod 4 can be set on the opposite side of the two panels. The pull rod 3 can include a grab rod and two sliding connecting rods. The two sliding connecting rods are respectively set at both ends of the grab rod, and both sliding connecting rods are perpendicular to the grab rod. The two sliding connecting rods are parallel to each other and extend in the same direction, so that the two sliding connecting rods are movably connected to the opposite sides of the mounting base 1 along the width direction, and the two sliding connecting rods are respectively connected to the limiting rod 4 at the corresponding positions. Alternatively, the mounting base 1 can be a rectangular structure, with the first direction being the length direction of the mounting base 1. Specifically, the lever 3 can be a U-shaped structure, with the two ends of the U-shaped structure forming the two connecting ends of the lever 3, and the middle part of the U-shaped structure forming a handhold for the user to hold, so that the user can apply pulling force to the lever 3 by holding the handhold.

[0072] By setting two positioning slots 11, wheel assembly 2 and limiting rod 4 on opposite sides of mounting base 1 respectively, and movably connecting the two ends of pull rod 3 to opposite sides of mounting base 1 respectively, and rotatably connecting the limiting rod 4 in the two telescopic groups to the two ends of pull rod 3 respectively, one pull rod 3 can control the rotation of wheel assembly 2 in two telescopic groups, and the rotation of wheel assembly 2 in two telescopic groups can be achieved simultaneously under the drive of one pull rod 3, which facilitates synchronous control of all wheel assembly 2 on mounting base 1.

[0073] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, in some embodiments, the wheel assembly 2 includes two rollers, which are spaced apart along a first direction. Each roller is rotatably connected to the side of the mounting base 1. The limiting rod 4 is rotatably connected to one of the rollers. Specifically, the limiting rod 4 is rotatably connected to the roller that is close to the pull rod 3 along the first direction. A transmission rod 23 is provided between the two rollers, and the two ends of the transmission rod 23 are rotatably connected to the two rollers respectively.

[0074] Specifically, two rollers can be spaced apart on the side of the mounting base 1 along the first direction, and each roller is rotatably connected to the side of the mounting base 1. The limiting rod 4 is rotatably connected to one of the rollers near the pull rod 3 in the first direction, so that the pull rod 3 can control the movement of one roller between the extended and retracted positions through the limiting rod 4. At the same time, since the two ends of the transmission rod 23 are rotatably connected to the two rollers respectively, the rotation of one roller can drive the other roller to rotate through the transmission rod 23, so that the pull rod 3 can control the rotation of the two rollers through the limiting rod 4. The transmission rod 23 can be rotatably connected to the two rollers by bolts, or it can be that both rollers are provided with rotating columns, and the two ends of the transmission rod 23 are provided with through holes. The rotating columns on the two rollers are rotatably connected to the through holes at the two ends of the transmission rod 23 respectively, so that the two ends of the transmission rod 23 are rotatably connected to the two rollers respectively.

[0075] By setting the wheel assembly 2 to include two rollers, the two rollers are spaced apart along the first direction and are connected to each other by a transmission rod 23, so that the two rollers can rotate synchronously. The limiting rod 4 is rotatably connected to the roller that is close to the pull rod 3 along the first direction, so that the pull rod 3 can control the roller that is close to the pull rod 3 in the first direction to switch between the extended position and the retracted position through the limiting rod 4, so that the pull rod 3 can simultaneously control the two rollers to switch between the extended position and the retracted position.

[0076] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, in some embodiments, the roller component includes a roller 22 and a rotating rod 21. The roller 22 is mounted on one end of the rotating rod 21, and the other end of the rotating rod 21 is rotatably connected to the side of the mounting base 1. The limiting rod 4 is rotatably connected to the rotating rod 21.

[0077] Specifically, the rotating rod 21 can be a straight rod, with a roller 22 installed at one end. The roller 22 can be a caster wheel or a wheel that rolls in the first direction. The end of the rotating rod 21 away from the roller 22 can be rotatably connected to the side of the mounting base 1. The side of the mounting base 1 can be provided with a rotating hole, and a rotating column can be provided at the end of the rotating rod 21 away from the roller 22. The rotating column is inserted into the rotating hole to rotatably connect the rotating rod 21 to the side of the mounting base 1. Alternatively, a through hole can be provided at the end of the rotating rod 21 away from the roller 22, and a cylindrical protrusion can be provided on the side of the mounting base 1. The cylindrical protrusion is movably inserted into the through hole of the rotating rod 21 to allow the rotating rod 21 to rotate around the cylindrical protrusion. Alternatively, a protrusion can be provided on the rotating rod 21, and a through hole can be provided at the end of the limiting rod 4. The protrusion and the through hole are movably inserted to rotatably connect the limiting rod 4 to the rotating rod 21.

[0078] The aforementioned rotating rod 21 can be rotatably connected to the end of the crossbar 41 in the limiting rod 4. When the pull rod 3 is provided with a connecting rod 5, the second rod part 52 of the connecting rod 5 is rotatably connected to the rotating rod 21. The connection point between the crossbar 41 and the rotating rod 21 and the connection point between the second rod part 52 and the rotating rod 21 are spaced apart along the length direction of the rotating rod 21.

[0079] By setting a roller component including a roller 22 and a rotating rod 21, the roller 22 is installed at one end of the rotating rod 21, and the other end of the rotating rod 21 is rotatably connected to the side of the mounting base 1. The limiting rod 4 is rotatably connected to the rotating rod 21, so that the position of the roller 22 in the height direction of the mounting base 1 can be changed by rotating the rotating rod 21 in the first direction. The rotation path of the rotating rod 21 is stable, which makes it convenient for the roller 22 to move between the extended position and the retracted position by rotating the rotating rod 21.

[0080] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, an elastic element 24 is provided between the wheel assembly 2 and the mounting base 1. The two ends of the elastic element 24 are connected to the wheel assembly 2 and the mounting base 1 respectively. When the wheel assembly 2 is in the extended position, the elastic element 24 is in a stretched state; when the wheel assembly 2 is in the retracted position, the elastic element 24 is in a free state without extension or retraction.

[0081] Specifically, the elastic element 24 can be a spring, with one end connected to the side of the mounting base 1 and the other end connected to the rotating rod 21 of the wheel assembly 2. When the wheel assembly 2 is in the extended position, the spring is in a stretched state, that is, the spring applies an elastic force to the wheel assembly 2 in the direction closer to the mounting base 1, thereby assisting the wheel assembly 2 to move from the extended position to the retracted position. Alternatively, when the wheel assembly 2 is in the retracted position, the elastic element 24 can also be in a stretched state, so that when the wheel assembly 2 is in the retracted position, the elastic force applied by the elastic element 24 to the wheel assembly 2 keeps the wheel assembly 2 stable in the retracted position.

[0082] An elastic element 24 is provided between the wheel assembly 2 and the side of the mounting base 1. The two ends of the elastic element 24 are respectively connected to the side of the wheel assembly 2 and the side of the mounting base 1. When the wheel assembly 2 is in the extended position, the elastic element 24 is in a stretched state, so that when the wheel assembly 2 is in the extended position, the elastic element 24 applies an elastic force to the wheel assembly 2 in the direction of the mounting base 1, so that the elastic force assists the wheel assembly 2 to rotate from the extended position to the retracted position.

[0083] In specific use, when the mounting base 1 is in a stationary state, the wheel assembly 2 is in the retracted position, and the end of the crossbar 41 is in the unlocked position within the sliding groove section 111. When the wheel assembly 2 needs to be moved to the extended position, the pull rod 3 is pushed toward the wheel assembly 2 along the first direction, causing the end of the crossbar 41 to slide within the sliding groove section 111. The crossbar 41 applies a driving force along the first direction toward the direction away from the pull rod 3 to the rotating rod 21 of the wheel assembly 2, causing the rotating rod 21 to carry the roller 22 toward the extended position. When the crossbar 41 is rotated and its end moves to the connection between the sliding groove section 111 and the limiting groove section 112, the pull rod 3 is rotated clockwise. This rotation of the pull rod 3 applies a driving force perpendicular to the first direction to the crossbar 41 through the diagonal rod 42. The driving force is directed towards the limiting groove section 112, thereby moving the end of the crossbar 41 from the sliding groove section 111 into the limiting groove section 112. Continuing to rotate the pull rod 3 clockwise, the end of the crossbar 41 reaches the farthest point of the limiting groove section 112 away from the sliding groove section 111. At this time, the limiting rod 4 is in the locked position, and the wheel assembly 2... Located in the extended position, and due to the limiting effect of the limiting groove 112, the frictional force along the first direction experienced by the roller 22 of the wheel assembly 2 when rolling on the ground will not cause the wheel assembly 2 to deviate from the extended position; when it is necessary to move the wheel assembly 2 from the extended position to the retracted position, the pull rod 3 is rotated counterclockwise, so that the pull rod 3 applies a driving force with a component perpendicular to the first direction to the crossbar 41 through the diagonal rod 42. The driving force is directed towards the sliding groove 111, thereby moving the end of the crossbar 41 from the limiting groove 112 into the sliding groove 111, moving it away from the first direction. Pulling the lever 3 away from the wheel assembly 2 causes the end of the crossbar 41 to slide along the sliding groove section 111. The crossbar 41 drives the rotating rod 21 of the wheel assembly 2 to rotate toward the mounting seat 1. The elastic force of the elastic element 24 assists the rotating rod 21 to rotate toward the mounting seat 1. The end of the crossbar 41 moves to the farthest end of the sliding groove section 111 away from the limiting groove section 112. At this time, the wheel assembly 2 is close to the mounting seat 1 and is in the retracted position. The mounting seat 1 is placed on the ground and the wheel assembly 2 cannot roll. The mounting seat 1 is suitable for being placed on a flat surface.

[0084] Reference Figures 1 to 6 As shown, this embodiment of the present disclosure also provides a housing, including a shell 6 and a telescopic wheel mechanism as described above. The bottom of the shell 6 is provided with an installation space, and the telescopic wheel mechanism is disposed in the installation space. When the wheel assembly 2 is in the extended position, it extends out of the installation space, and when the wheel assembly 2 is in the retracted position, it retracts into the installation space.

[0085] Specifically, the outer shell can be rectangular or other shapes. The bottom of the shell has a cavity as an installation space, and the telescopic wheel mechanism is installed in the cavity. The mounting base 1 is fitted to the inner wall of the cavity. The mounting base 1 can be connected to the shell by welding or by bolts. The bottom surface of the installation space has an opening, allowing the wheel assembly 2 to extend or retract into the installation space through the opening.

[0086] By setting the telescopic wheel mechanism on the box, the external force required to push the box can be reduced when the wheel assembly 2 is in the extended position, making it easier to rotate the box. When the wheel assembly 2 is in the retracted position, the bottom surface of the box is flat, which can be placed stably on the panel of the carriage or trailer, thus making it convenient to use other tools to move the box.

[0087] Specifically, the enclosure can be a pet carrier, storage box, travel bag, or large storage box, and can be used in vehicles or for everyday purposes. This disclosure does not specify the exact shape, size, type, or purpose of the enclosure.

[0088] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0089] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A retractable wheel mechanism, characterized by, Includes mounting base, wheel assembly, tie rod, and limit rod; The mounting base is provided with a connecting groove extending in a first direction, and the pull rod is provided with a connecting post. The connecting post is slidably disposed in the connecting groove, and the pull rod can rotate relative to the mounting base around the connecting post. The wheel assembly is rotatably mounted on the mounting base, and the wheel assembly has an extended position extending out of the mounting base and a retracted position retracting into the mounting base; The limiting rod is connected between the pull rod and the wheel assembly. The mounting base is provided with a positioning groove. The limiting rod slides in the positioning groove. The limiting rod has a locked position and an unlocked position in the positioning groove. The pull rod rotates relative to the mounting base around the connecting column to drive the limiting rod to switch between the locked position and the unlocked position. When the limiting rod is in the unlocked position, the pull rod slides relative to the mounting base in the first direction to drive the wheel assembly to switch between the extended position and the retracted position. The positioning groove includes a sliding groove segment and a limiting groove segment that are interconnected. The sliding groove segment and the limiting groove segment are set at an angle to each other, and the sliding groove segment is parallel to the extension direction of the connecting groove. When the limiting rod is in the limiting groove section, it engages with the limiting groove section to limit the sliding of the pull rod relative to the mounting base in the first direction.

2. The retractable wheel mechanism of claim 1, wherein The connecting groove is disposed on the side of the mounting base, the connecting post is located in the middle region of the pull rod along the first direction, one end of the pull rod along the first direction is formed with a handle, and the other end of the pull rod along the first direction is connected to the limiting rod.

3. The retractable wheel mechanism of claim 1, wherein, The limiting rod includes a horizontal bar and a diagonal bar connected to each other. One end of the horizontal bar is slidably connected to the positioning groove, and the other end is rotatably connected to the wheel assembly. One end of the diagonal bar is connected to the pull rod, and the other end is movably connected to the middle area of ​​the horizontal bar.

4. The retractable wheel mechanism of claim 1, wherein, A connecting rod is also provided between the pull rod and the wheel assembly. One end of the connecting rod is rotatably connected to the pull rod, and the other end is rotatably connected to the wheel assembly.

5. The retractable wheel mechanism of claim 4, wherein, The connecting rod includes a first rod portion and a second rod portion that are connected to each other. The first rod portion is rotatably connected to the pull rod, and the second rod portion is rotatably connected to the wheel assembly. The first rod portion and the second rod portion are arranged at an angle.

6. The retractable wheel mechanism of claim 1, wherein, The wheel assembly and the limiting rod are both in pairs. The pull rod has two connecting ends, which are movably connected to the opposite sides of the mounting base. Each of the opposite sides of the mounting base is provided with a wheel assembly and a limiting rod, and the two limiting rods are rotatably connected to the two connecting ends of the pull rod.

7. The telescopic wheel mechanism according to claim 1, characterized in that, The wheel assembly includes two rollers, which are spaced apart along the first direction. Each roller is rotatably connected to the side of the mounting base. The limiting rod is rotatably connected to one of the rollers. A transmission rod is provided between the two rollers, and both ends of the transmission rod are rotatably connected to the two rollers respectively.

8. The retractable wheel mechanism of claim 7, wherein, The roller component includes a roller and a rotating rod. The roller is mounted on one end of the rotating rod, and the other end of the rotating rod is rotatably connected to the side of the mounting base. The limiting rod is rotatably connected to the rotating rod.

9. A retractable wheel arrangement according to any one of claims 1 to 8, wherein, An elastic element is provided between the wheel assembly and the mounting base. The two ends of the elastic element are connected to the wheel assembly and the mounting base, respectively. When the wheel assembly is in the extended position, the elastic element is in an elongated state. When the wheel assembly is in the retracted position, the elastic element is in a free state without extension or retraction.

10. A case characterized by comprising: The device includes a housing and a telescopic wheel mechanism as described in any one of claims 1 to 9, wherein the bottom of the housing is provided with an installation space, the telescopic wheel mechanism is disposed in the installation space, the wheel assembly extends out of the installation space when it is in the extended position, and retracts into the installation space when it is in the retracted position.

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