Telescopic wheel mechanism and box body

Abstract

The invention relates to the technical field of wheel body telescopic devices, and provides a telescopic wheel mechanism and a box body. Wherein the telescopic wheel mechanism is provided with a connecting groove extending in the first direction, the pull rod is provided with a connecting column, the connecting column is slidably arranged in the connecting groove, and the pull rod can rotate around the connecting column relative to the mounting base; the wheel body assembly is rotationally arranged on the mounting seat and has an extending position and a retracting position for extending out of and retracting the mounting seat; the limiting rod piece is connected between the pull rod and the wheel body assembly, a positioning groove is formed in the mounting base, the limiting rod piece is in sliding fit with the positioning groove, and the limiting rod piece has a locking position and an unlocking position in the positioning groove; the pull rod rotates around the connecting column relative to the mounting base so as to drive the limiting rod piece to be switched between the locking position and the unlocking position, and when the limiting rod piece is located at the unlocking position, the pull rod slides in the first direction relative to the mounting base so as to drive the wheel body assembly to be switched between the stretching-out position and the retracting position, so that the pull rod conveniently controls stretching out, drawing back and locking of the wheel body assembly.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wheel telescopic devices, and in particular to a telescopic wheel mechanism and a box. Background Art

[0002] The popularity of vehicles has led to more and more derivative scenarios for using vehicles. Items such as pet boxes, storage boxes, travel bags and large storage boxes used by people often need to meet different needs such as vehicle-mounted and daily use. In daily life or transportation, such items usually need to be moved with the help of a pulley mechanism at the bottom. If the pulley is directly fixed to the box, it is difficult to fix it when it is in the vehicle, the contact surface between the box and the vehicle is small, and the sliding friction is also small. If it is easily moved by a large impact force, it will endanger the life safety of the passengers in the car.

[0003] In order to fix the box, the existing pulley structure arranged at the bottom of the box is mostly a simple disassembly or folding structure. When the user puts the box with the pulley into the trunk of the vehicle, the user is often required to directly disassemble or fold the pulley to fold the pulley to ensure the stability of the position of the box and the vehicle. However, the storage operation of the pulley at the bottom of the box is laborious and uncomfortable, which affects the user experience. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a telescopic wheel mechanism and a box.

[0005] The present disclosure provides a telescopic wheel mechanism, comprising a mounting seat, a wheel body assembly, a pull rod and a limiting rod;

[0006] The mounting seat is provided with a connecting groove extending along a first direction, the pull rod is provided with a connecting column, the connecting column is slidably arranged in the connecting groove, and the pull rod can rotate relative to the mounting seat around the connecting column;

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

[0008] The limiting rod is connected between the pull rod and the wheel assembly, a positioning groove is provided on the mounting seat, the limiting rod is slidably matched with the positioning groove, and the limiting rod has a locking position and an unlocking position in the positioning groove;

[0009] The pull rod rotates around the connecting column relative to the mounting seat to drive the limiting rod to switch between the locking position and the unlocking position, and when the limiting rod is in the unlocking position, the pull rod slides along the first direction relative to the mounting seat to drive the wheel assembly to switch between the extended position and the retracted position.

[0010] Optionally, the positioning groove comprises a sliding groove section and a limiting groove section which are connected to each other, the sliding groove section and the limiting groove section are arranged at an angle, and the sliding groove section is parallel to the extension direction of the connecting groove;

[0011] When the limiting rod is in the limiting groove section, it is in limiting cooperation with the limiting groove section to limit the pull rod from sliding relative to the mounting seat along the first direction.

[0012] Optionally, the connecting groove is arranged on the side of the mounting seat, the connecting column is located in the middle area of ​​the pull rod along the first direction, a hand-holding portion is formed at one end of the pull rod along the first direction, 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 cross bar and an oblique rod connected to each other, one end of the cross bar is slidably connected to the positioning groove, and the other end is rotatably connected to the wheel assembly, one end of the oblique rod is connected to the pull rod, and the other end is movably connected to the middle area of ​​the cross bar.

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

[0015] Optionally, the connecting rod includes a first rod portion and a second rod portion connected to each other, the first rod portion is rotationally connected to the pull rod, the second rod portion is rotationally connected to the wheel assembly, and the first rod portion and the second rod portion are arranged at an angle.

[0016] Optionally, the number of the wheel body assemblies and the limiting rods are both two, the pull rod has two connecting ends, and the two connecting ends of the pull rod are respectively movably connected to the two opposite sides of the mounting seat, and the mounting seat is respectively provided with a wheel body assembly and a limiting rod on the two opposite sides, and the two limiting rods are respectively rotatably connected to the two connecting ends of the pull rod.

[0017] Optionally, the wheel body assembly includes two roller members, the two roller members are spaced apart along the first direction, each of the roller members is rotatably connected to the side of the mounting seat, the limiting rod is rotatably connected to one of the roller members, a transmission rod is provided between the two roller members, and both ends of the transmission rod are rotatably connected to the two roller members respectively.

[0018] Optionally, the roller member 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 surface of the mounting seat, and the limiting rod is rotatably connected to the rotating rod.

[0019] Optionally, an elastic member is provided between the wheel body assembly and the mounting seat, and two ends of the elastic member are respectively connected to the wheel body assembly and the mounting seat, and when the wheel body assembly is in the extended position, the elastic member is in an elongated state, and when the wheel body assembly is in the retracted position, the elastic member is in a non-extended free state.

[0020] The present disclosure also provides a box body, comprising an outer shell and the retractable wheel mechanism as described in any one of the above items, wherein an installation space is provided at the bottom of the outer shell, the retractable wheel mechanism is arranged in the installation space, and the wheel body assembly extends out of the installation space when in an extended position, and retracts into the installation space when in a retracted position.

[0021] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0022] The telescopic wheel mechanism and box body provided by the present invention include a mounting seat, a wheel body assembly, a pull rod and a limit rod; the mounting seat is provided with a connecting groove extending along a first direction, the pull rod is provided with a connecting column, the connecting column is slidably arranged in the connecting groove, and the pull rod can rotate relative to the mounting seat around the connecting column; the wheel body assembly is rotatably arranged on the mounting seat, the wheel body assembly has an extended position extending from the mounting seat and a retracted position retracted from the mounting seat; the limit rod is connected between the pull rod and the wheel body assembly, the mounting seat is provided with a positioning groove, the limit rod is slidably matched with the positioning groove, and the limit rod has a locked position and an unlocked position in the positioning groove; the pull rod rotates relative to the mounting seat around the connecting column, The cam is in a locked position and is in a locked position so that the wheel assembly is restricted from rotating. The cam is in an unlocked position so that the wheel assembly remains in an extended state from the mounting seat and serves as a pulley of the mounting seat. When the cam is in an unlocked position, the pull rod slides relative to the mounting seat in a first direction so as to drive the wheel assembly to switch between an extended position and a retracted position. The user can control the extension and retraction of the wheel assembly on the mounting seat by sliding and rotating the pull rod, while controlling the locking and unlocking of the wheel assembly by the cam, thereby improving the convenience of the user in controlling the extension and retraction of the wheel assembly and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

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

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

[0027] Figure 3 It is a structural schematic diagram of the wheel assembly of the telescopic wheel mechanism according to an embodiment of the present disclosure in a retracted position;

[0028] Figure 4 It is a schematic structural diagram of the roller member according to an embodiment of the present disclosure;

[0029] Figure 5 It is a schematic diagram of the structure of the roller according to the embodiment of the present disclosure;

[0030] Figure 6 It is a schematic diagram of the structure of the box body described in the embodiment of the present disclosure.

[0031] Among them, 1. mounting seat; 11. positioning groove; 111. sliding groove section; 112. limiting groove section; 12. connecting groove; 2. wheel body assembly; 21. rotating rod; 22. roller; 23. transmission rod; 24. elastic member; 3. pull rod; 31. connecting column; 4. limiting rod; 41. cross rod; 42. oblique rod; 5. connecting rod; 51. first rod portion; 52. second rod portion; 6. outer shell. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

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

[0035] The mounting seat 1 is provided with a connecting groove 12 extending along the first direction, and the pull rod 3 is provided with a connecting column 31, the connecting column 31 is slidably arranged in the connecting groove 12, and the pull rod 3 can rotate relative to the mounting seat 1 around the connecting column 31;

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

[0037] The limiting rod 4 is connected between the pull rod 3 and the wheel assembly 2. The mounting seat 1 is provided with a positioning groove 11. The limiting rod 4 is slidably matched with the positioning groove 11. The limiting rod 4 has a locking position and an unlocking position in the positioning groove 11.

[0038] The pull rod 3 rotates around the connecting column 31 relative to the mounting seat 1 to drive the limiting rod 4 to switch between the locked position and the unlocked position, and when the limiting rod 4 is in the unlocked position, the pull rod 3 slides along the first direction relative to the mounting seat 1 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 to be two parallel rectangular panels, and of course, it can also be selected to be a rectangular shell. The mounting base 1 is mainly used to support the structure of the wheel body 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 is installed on the box. When the wheel body assembly 2 is placed on the ground, the first direction is the length direction of the mounting base 1 parallel to the ground, the direction of the mounting base 1 perpendicular to the ground 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 body assembly 2 can be selected to be spaced apart 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 above-mentioned pull rod 3 can be selected as 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 seat 1, and the other end extends along the first direction toward the direction away from the mounting seat 1; the side of the mounting seat 1 can be selected to be provided with a through hole extending along the first direction as the connecting groove 12, and the connecting column 31 can be selected to be a cylindrical structure, and the connecting column 31 is arranged in the middle position of the pull rod 3, so that the connecting column 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 column 31 and the inner wall of the connecting groove 12, so that the connecting column 31 can rotate around the axis of the connecting column 31 in the connecting groove 12, so that the pull rod 3 can rotate around the axis of the connecting column 31 relative to the mounting seat 1; of course, it is also possible to select a groove extending along the first direction as the connecting groove 12 on the side of the mounting seat 1, and the connecting column 31 is inserted into the groove, and the connecting column 31 and the connecting groove 1 2, there is a gap between the inner walls of the connecting column 31, so that the connecting column 31 can slide along the groove and rotate around the connecting column 31; of course, it is also possible to select a groove extending along the first direction on the side of the mounting seat 1 as the connecting groove 12, and the connecting column 31 is inserted into the groove, and it is selected that there is a gap between the connecting column 31 and the inner wall of the connecting groove 12, so that the connecting column 31 can slide along the groove and rotate around the connecting column 31; of course, it is also possible to select the connecting column 31 as a column with a rectangular cross-section, and a rotating shaft is provided on the connecting column 31, and the axis of the rotating shaft is the axis of the connecting column 31, and the rotating shaft is rotatably connected to the pull rod 3, and the connecting column 31 is slidably connected to the connecting groove 12, so that the connecting column 31 can slide in the connecting groove 12, and the pull rod 3 rotates through the rotating shaft of the connecting column 31, so that the pull rod 3 can slide relative to the mounting seat 1 along the first direction and can rotate relative to the mounting seat 1.

[0041] It is understandable that along the height direction of the mounting base 1, the pull rod 3 can be selectively set below the positioning slot 11, of course, it can also be selected to be set above the positioning slot 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 above-mentioned limiting rod 4 can be selected to have one end movably connected to the wheel body assembly 2 and the other end slidably connected to the positioning groove 11, and the pull rod 3 is connected to the limiting rod 4 through the rod, and the two ends of the rod are respectively rotatably connected to the pull rod 3 and the limiting rod 4, so that when the pull rod 3 rotates, the pull rod 3 can apply a driving force to the limiting rod 4, so that the pull rod 3 drives the limiting rod 4 to move between the locking position and the unlocking position of the positioning groove 11; when the connecting column 31 is set in the middle of the pull rod 3, the end of the pull rod 3 away from the wheel body assembly 2 moves downward, and the end of the pull rod 3 close to the wheel body assembly 2 will move upward, and the end of the pull rod 3 away from the wheel body assembly 2 moves upward, and the pull rod 3 close to the wheel body assembly 2 One end of the pull rod 3 close to the wheel body assembly 2 will move downward, and the end of the pull rod 3 close to the wheel body assembly 2 will be rotatably connected to the limit rod 4. The pull rod 3 can apply a driving force to the limit rod 4 by rotating around the connecting column 31, so that the limit rod 4 moves between the locked position and the unlocked position; of course, when the connecting column 31 is set at one end of the pull rod 3 close to the wheel body assembly 2, the limit rod 4 can be selected to be connected to the middle part of the pull rod 3. When the pull rod 3 rotates around the connecting column 31, the position where the limit rod 4 is connected to the pull rod 3 in the height direction of the mounting seat 1 will be changed, so that the pull rod 3 can drive the limit rod 4 to move between the locked position and the unlocked position by applying a driving force to the limit rod 4.

[0043] The above-mentioned positioning groove 11 can be selected to extend along the first direction on the side of the mounting seat 1, and the end of the positioning groove 11 is provided with a limiting notch perpendicular to the first direction, and the end of the limiting rod 4 can be engaged with the limiting notch, so that the end of the positioning groove 11 with the limiting notch is in a locked position, and the rotating end of the pull rod 3 that can rotate relative to the mounting seat 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 limits the movement of the limiting rod 4 in the first direction, so that when the wheel body assembly 2 is subjected to a force along the first direction, The cooperation between the limiting rod 4 and the limiting notch prevents the wheel body assembly 2 from rotating from the extended position to the retracted position, thereby achieving locking. The pull rod 3 rotates relative to the mounting seat 1, and the rotating end applies a driving force perpendicular to the first direction to the rod through the connecting rod, so that the limiting rod 4 disengages from the limiting notch. At this time, the end of the limiting rod 4 can slide in the limiting groove, and the pull rod 3 moves along the first direction to drive the limiting rod 4 to slide in the limiting groove. The movement of the limiting rod 4 drives the wheel body assembly 2 to rotate at the same time; when the limiting rod 4 can slide in the positioning groove 11 so that the wheel body assembly 2 can rotate relative to the mounting seat 1, it is the unlocking position.

[0044] The above-mentioned extended position is the position where the wheel part of the wheel body assembly 2 can contact the ground and roll when the mounting seat 1 is placed on the ground, and the limiting rod 4 is in the locked position at this time, so that the wheel body assembly 2 will not rotate toward the mounting seat 1 when rolling on the ground, that is, the wheel body assembly 2 is in a locked state; the retracted position is the position where the wheel body assembly 2 rotates relative to the mounting seat 1 and is close to the mounting seat 1, so that when the mounting seat 1 is placed on the ground, the wheel part of the wheel body assembly 2 cannot contact the ground and roll, and the limiting rod 4 is in the unlocked position at this time, and the wheel body assembly 2 is in an unlocked state, so that the wheel body assembly 2 can rotate relative to the mounting seat 1 under the control of the pull rod 3 to control the wheel body assembly 2 to move and switch between the extended position and the retracted position.

[0045] When in use, the mounting seat 1 is in a static state, the wheel body assembly 2 is in a retracted position, and the limiting rod 4 is in an unlocked position. When the wheel body assembly 2 needs to be transformed into an extended position for rolling, the pull rod 3 is pushed toward the wheel body assembly 2 along the first direction, so that the wheel body assembly 2 is pushed by the pull rod 3 and rotates relative to the mounting seat 1. At this time, the limiting rod 4 slides along the positioning groove 11. When the wheel part of the wheel body assembly 2 rotates in a direction away from the mounting seat 1 until the wheel body assembly 2 extends out of the mounting seat 1 to reach the extended position, the pull rod 3 is rotated so that the end of the pull rod 3 connected to the limiting rod 4 drives the limiting rod 4 to enter the locking position of the positioning groove 11. At this time, the wheel body 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 body assembly 2 will not rotate relative to the mounting seat 1 due to the force in the first direction, so that the wheel body assembly 2 can support the mounting seat 1, and at the same time, the wheel part of the wheel body assembly 2 can roll on the ground to facilitate the movement of the mounting seat 1 on the ground.

[0046] The telescopic wheel mechanism provided by the embodiment of the present disclosure includes a mounting seat 1, a wheel body assembly 2, a pull rod 3 and a limiting rod 4; the mounting seat 1 is provided with a connecting groove 12 extending along a first direction, the pull rod 3 is provided with a connecting column 31, the connecting column 31 is slidably arranged in the connecting groove 12, and the pull rod 3 can rotate relative to the mounting seat 1 around the connecting column 31; the wheel body assembly 2 is rotatably arranged on the mounting seat 1, and the wheel body assembly 2 has an extended position extending from the mounting seat 1 and a retracted position retracting from the mounting seat 1; the limiting rod 4 is connected between the pull rod 3 and the wheel body assembly 2, the mounting seat 1 is provided with a positioning groove 11, the limiting rod 4 is slidably matched with the positioning groove 11, and the limiting rod 4 has a locked position and an unlocked position in the positioning groove 11; the pull rod 3 is relatively fixed around the connecting column 31 The mounting seat 1 is rotated to drive the limiting rod 4 to switch between the locked position and the unlocked position, so that when the limiting rod 4 is in the locked position, the rotation of the wheel body assembly 2 relative to the mounting seat 1 is restricted, so that the wheel body assembly 2 remains in an extended state from the mounting seat 1 and serves as a pulley of the mounting seat 1. When the limiting rod 4 is in the unlocked position, the pull rod 3 slides along the first direction relative to the mounting seat 1 to drive the wheel body assembly 2 to switch between the extended position and the retracted position, so that the user can control the extension and retraction of the wheel body assembly 2 on the mounting seat 1 by sliding and rotating the pull rod 3, and control the locking and unlocking of the wheel body assembly 2 by the limiting rod 4, thereby improving the convenience of the user in controlling the extension and retraction of the wheel body assembly 2 and improving the user's usage 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 extending 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 limitedly matched with the limiting groove section 112 to limit the pull rod 3 from sliding relative to the mounting seat 1 .

[0049] Specifically, the sliding groove section 111 and the limiting groove section 112 can be selected to be linear grooves, the sliding groove section 111 can be selected to extend along the first direction, the limiting groove section 112 can be set at the end of the sliding groove section 111, the limiting groove section 112 can be selected to be set at the end of the sliding groove section 111 close to the wheel body assembly 2 along the first direction, and the extension direction of the limiting groove section 112 is perpendicular to the extension direction of the sliding groove section 111, so that the positioning groove 11 forms an L-shaped groove body, so that the pull rod 3 rotates and drives the end of the limiting rod 4 away from the wheel body assembly 2 to move from the limiting groove section 112 to the sliding groove section 111, and then the pull rod 3 moves along the first direction toward the end away from the wheel body assembly 2, and the end of the limiting rod 4 away from the wheel body assembly 2 moves along the sliding groove section 111 toward the direction away from the wheel body assembly 2, so that the wheel body assembly 2 rotates to the retracted position as the limiting rod 4 moves.

[0050] The angle between the above-mentioned limiting groove section 112 and the sliding groove section 111 can be selected to be 90°, and of course it can also be selected to be 60°, as long as the movement of the limiting rod 4 in the limiting groove section 112 along the first direction is restricted, so that the wheel body assembly 2 cannot rotate, so as to achieve the limiting cooperation between the limiting groove section 112 and the limiting rod 4; the limiting groove section 112 can be selected to be perpendicular to the first direction, so that when the wheel body assembly 2 is subjected to the force along the first direction, the end of the limiting rod 4 is restricted by the inner wall of the limiting groove section 112 and cannot move, so that the wheel body assembly 2 cannot rotate; when the limiting rod 4 is located in the limiting groove section 112, the limiting rod 4 is located in the locking position, and the user can push the mounting seat 1 to make the wheel in the wheel body assembly 2 roll, and the friction force along the first direction generated by the wheel body assembly 2 when rolling is due to the limiting groove The limiting effect of the segment 112 will not cause the wheel body 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. Through the different rotation directions of the pull rod 3, the limiting rod 4 moves upward or downward 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, and the position where the limiting rod 4 in the first direction disappears is the unlocking position of the positioning groove 11; when the limiting rod 4 is in the unlocking position, the limiting rod 4 moves along the first direction toward the direction away from or close to the wheel body assembly 2, so that the wheel body assembly 2 can be rotated relative to the mounting seat 1 under the drive of the limiting rod 4.

[0051] The above-mentioned limiting rod 4 can be selected to be composed of two straight rods, one end of which is provided with a cylindrical protrusion, so that the cylindrical protrusion can be inserted into the positioning groove 11, so that the cylindrical protrusion is slidably connected to the positioning groove 11, and the other end of the straight rod is rotatably connected to the wheel body assembly 2, and the two ends of the other straight rod are respectively rotatably connected to the pull rod 3 and the straight rod provided with the cylindrical protrusion as a connecting rod, and the connecting rod is connected to the part of the pull rod 3 away from the rotation center relative to the mounting seat 1, so that when the pull rod 3 rotates relative to the mounting seat 1, the pull rod 3 can apply a force perpendicular to the first direction to the straight rod provided with the cylindrical protrusion through the connecting rod, and according to the rotation direction of the pull rod 3, the cylindrical protrusion can be subjected to a force toward the sliding groove section 111 in the limiting groove section 112 or the cylindrical protrusion can be subjected to a force toward the limiting groove section 112 in the sliding groove section 111, so that 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] By setting a telescopic wheel mechanism, the telescopic wheel mechanism includes a mounting seat 1, a wheel body assembly 2, a pull rod 3 and a limit rod 4; the pull rod 3 is slidably arranged on the side of the mounting seat 1 along a first direction, and can rotate relative to the mounting seat 1, the wheel body assembly 2 is rotatably arranged on the side of the mounting seat 1, and a positioning groove 11 is provided on the mounting seat 1, and the positioning groove 11 includes a sliding groove section 111 and a limit groove section 112, one end of the limit rod 4 is slidably connected to the positioning groove 11, and the other end is rotatably connected to the wheel body assembly 2, and the limit groove section 112 limits the limit rod The end of 4 moves along the first direction, so that the wheel body assembly 2 will not rotate when it is subjected to the friction force along the first direction when rolling, thereby maintaining the stability of the wheel body assembly 2 when rolling, and the pull rod 3 rotates relative to the mounting seat 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 body assembly 2 can rotate relative to the mounting seat 1, and the pull rod 3 slides along the first direction to drive the wheel body assembly 2 to switch between an extended position away from the mounting seat 1 and a retracted position close to the mounting seat 1.

[0053] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the connecting groove 12 is arranged on the side of the mounting seat 1, the connecting column 31 is located in the middle area of ​​the pull rod 3 along the first direction, a hand-holding portion 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.

[0054] Specifically, a through hole extending along the first direction can be selected as the connecting groove 12 provided on the side of the mounting seat 1, and the connecting column 31 can be selected as a cylindrical structure, so that the connecting column 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 column 31 and the inner wall of the connecting groove 12, so that the connecting column 31 can rotate around the axis of the connecting column 31 in the connecting groove 12, so that the pull rod 3 can rotate around the axis of the connecting column 31 relative to the mounting seat 1; of course, a groove extending along the first direction can also be selected as the connecting groove 12.

[0055] One end of the above-mentioned pull rod 3 can be selected to be rotatably connected to the limiting rod 4 as a connecting end. The pull rod 3 extends along the first direction toward the direction away from the wheel body assembly 2 and serves as a hand-held portion suitable for the user to grasp. The middle area is the area of ​​the pull rod 3 between the hand-held portion and the connecting end along the first direction. The pull rod 3 can be selected to be set at a position close to the connecting end in the middle area, so that the user can hold the hand-held portion and apply a driving force along the height direction of the mounting seat 1 to rotate the pull rod 3 around the axis of the connecting column 31, so that the rotation of the pull rod 3 drives the limiting rod 4 to move between the limiting groove section 112 and the sliding groove section 111. Of course, the connecting column 31 can also be selected to be set at the midpoint of the length of the pull rod 3 along the first direction.

[0056] When the limiting groove section 112 is located at the lower side of 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, and the limiting rod 4 moves 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, and the limiting rod 4 can move from the sliding groove section 111 to the limiting groove section 112.

[0057] By setting the connecting groove 12 on the side of the mounting seat 1, the connecting column 31 is located in the middle area of ​​the pull rod 3 along the first direction, and a hand-holding portion 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 column 31, the pull rod 3 can also rotate around the axis of the connecting column 31, so that the pull rod 3 can rotate relative to the mounting seat 1 at different positions along the first direction in the connecting groove 12, so that the pull rod 3 can apply a driving force different from the first direction to the limiting rod 4 at any position of the connecting groove 12 by rotating around the axis of the connecting column 31, so that the end of the limiting rod 4 moves between the locked position and the unlocked position, thereby improving the convenience of the pull rod 3 applying the driving force to the limiting rod 4.

[0058] In some embodiments, the sliding slot section 111 is arranged along the first direction, the limiting slot section 112 is arranged along the height direction of the mounting seat 1 , and the limiting slot section 112 is located below the sliding slot section 111 .

[0059] Specifically, the sliding groove section 111 can be selected to extend on the side of the mounting seat 1, and the limiting groove section 112 can be selected to extend on the side of the mounting seat 1 along the height direction of the mounting seat 1. The limiting groove section 112 can be selected to set the end of the sliding groove section 111 to form an L-shaped positioning groove 11. Of course, the limiting groove section 112 can also be selected to be set in the middle area of ​​the sliding groove section 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 selected to be located between the pull rod 3 and the wheel body assembly 2 along the first direction, so that the limiting groove section 112 is set at one end of the sliding groove section 111 close to the wheel body assembly 2 along the first direction, so that after the end of the limiting rod 4 enters the sliding groove section 111 from the limiting groove section 112, the end of the limiting rod 4 can only slide in the sliding groove section 111 along the first direction toward the direction away from the wheel body assembly 2, so that the limiting rod 4 drives the wheel body assembly 2 to rotate.

[0060] By setting the sliding groove section 111 along the first direction, the limiting groove section 112 along the height direction of the mounting seat 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 body assembly 2 is subjected to the force along the first direction and has a tendency to rotate, since the end of the limiting rod 4 will move downward due to the action of gravity, the limiting rod 4 can be stably located in the limiting groove section 112, thereby limiting the rotation of the wheel body 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 cross rod 41 and a diagonal rod 42 that are connected to each other, one end of the cross rod 41 is slidably connected to the positioning groove 11, and the other end is rotatably connected to the wheel body 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 cross rod 41.

[0062] Specifically, the cross bar 41 and the diagonal bar 42 can be selected to be straight bars, and a slider or a cylindrical protrusion can be provided at one end of the cross bar 41. The slider or the cylindrical protrusion is plugged into the positioning groove 11, so that the cross bar 41 is slidably connected to the positioning groove 11, and the other end of the cross bar 41 can be rotatably connected to the wheel body assembly 2 using bolts, or of course, it can also be selected to be rotatably connected to the wheel body assembly 2 using rivets; through holes can be optionally provided at both ends of the diagonal bar 42, and bolts, rivets or screws can be used to pass through the through holes at the ends of the diagonal bar 42, so that the two ends of the diagonal bar 42 are respectively rotatably connected to the wheel body assembly 2 and the pull rod 3, and the diagonal bar 42 is connected to the end of the pull rod 3 close to the wheel body assembly 2, so that the user grasps the end of the pull rod 3 away from the wheel body assembly 2 around the axis of the connecting column 31. When rotated, the end of the pull rod 3 connected to the diagonal rod 42 will also rotate around the axial center line of the connecting column 31, so that the pull rod 3 applies a force along the height direction of the mounting seat 1 to the diagonal rod 42, so that the diagonal rod 42 drives the end of the cross bar 41 to move between the limiting groove section 112 and the sliding groove section 111; the middle area of ​​the cross bar 41 can be selected as the area between one end of the cross bar 41 connected to the positioning groove 11 and the other end connected to the wheel body assembly 2; the diagonal rod 42 is connected to the middle area of ​​the cross bar 41, which is beneficial for the diagonal rod 42 to apply a force along the height direction of the mounting seat 1 to the cross bar 41 when the pull rod 3 rotates, and the cross bar 41 is more likely to move under the action of the force, so that the cross bar 41 can be driven to move in the limiting groove section 112 even when the force used by the user to rotate the pull rod 3 is small.

[0063] By setting the limiting rod 4 to include a cross rod 41 and a diagonal rod 42, one end of the cross rod 41 is connected to the positioning groove 11, and the other end is rotatably connected to the wheel body assembly 2, so that when the wheel body assembly 2 rotates, it can drive the cross 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 cross 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 seat 1, the diagonal rod 42 applies an external force to the middle area of ​​the cross rod 41 to more easily drive the cross rod 41 to move, thereby reducing the external force applied by the user on the pull rod 3, and facilitating 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 further provided between the pull rod 3 and the wheel body assembly 2 , and 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 body assembly 2 .

[0065] Specifically, the connecting rod 5 can be selected as a straight rod, and of course the connecting rod 5 can also be selected as a bent rod, as long as the two ends of the connecting rod 5 are rotationally connected to the pull rod 3 and the wheel body assembly 2 respectively, so that when the pull rod 3 moves along the first direction, the driving force along the first direction can be applied to the wheel body assembly 2 through the connecting rod 5. Since the limiting rod 4 is rotationally connected with the pull rod 3, the positioning groove 11 and the wheel body assembly 2, when the pull rod 3 moves along the first direction to drive the wheel body assembly 2 to rotate relative to the mounting seat 1, the force of the pull rod 3 on the wheel body assembly 2 will be lost in the rotation of the limiting rod 4, and the limiting rod 4 abuts against the inner wall of the positioning groove 11 under the push of the pull rod 3, so that part of the driving force on the pull rod 3 is lost in friction. Therefore, the connecting rod 5 is used to directly connect the pull rod 3 and the wheel body assembly 2, and when the pull rod 3 moves along the first direction, it directly applies a driving force to the wheel body assembly 2 to rotate the wheel body assembly 2, thereby reducing the external force required to drive the wheel body assembly 2 to rotate.

[0066] By setting a connecting rod 5 between the pull rod 3 and the wheel body assembly 2, the pull rod 3 can directly apply a driving force to the wheel body assembly 2 through the connecting rod 5, thereby avoiding that when the pull rod 3 applies a driving force to the wheel body assembly 2 through the lower limit rod 4, the transmission efficiency of the driving force is reduced due to the rotation of the limit rod 4. The connecting rod 5 connects the pull rod 3 with the wheel body assembly 2, which can improve the stability of the wheel body assembly 2 during rotation.

[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 rotationally connected to the pull rod 3, the second rod portion 52 is rotationally connected to the wheel body assembly 2, and the first rod portion 51 and the second rod portion 52 are arranged at an angle.

[0068] Specifically, the first rod portion 51 and the second rod portion 52 can be selected to be straight rods, and the angle between the first rod portion 51 and the second rod portion 52 can be selected to be 90°, and of course the angle can also be selected to be 120°. The opening of the angle between the first rod portion 51 and the second rod portion 52 is set downward, that is, the first rod portion 51 is inclined upward relative to the first direction along the height direction of the mounting seat 1, and the second rod portion 52 is inclined upward relative to the first direction along the height direction of the mounting seat 1, so that there is a certain avoidance space below the first rod portion 51 and the second rod portion 52. When the wheel body assembly 2 is in the second state, since the wheel body assembly 2 is close to the mounting seat 1, the avoidance space below the first rod portion 51 and the second rod portion 52 can avoid the wheel part at the bottom end of the wheel body assembly 2, thereby avoiding interference of the connecting rod 5 when the wheel body assembly 2 rotates.

[0069] By setting the connecting rod 5 to include a first rod portion 51 and a second rod portion 52, and 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 body assembly 2 when the wheel body assembly 2 rotates, thereby preventing the connecting rod 5 from interfering with the wheel body assembly 2 when the wheel body assembly 2 rotates.

[0070] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the number of the positioning groove 11, the wheel body assembly 2 and the limiting rod 4 are all two, the pull rod 3 has two connecting ends, and the two connecting ends of the pull rod 3 are respectively movably connected to the two opposite sides of the mounting seat 1, and the positioning groove 11, the wheel body assembly 2 and the limiting rod 4 are respectively arranged on the opposite sides of the mounting seat 1, and the two limiting rods 4 located on both sides of the mounting seat 1 are respectively rotatably connected to the two connecting ends of the pull rod 3.

[0071] Specifically, when the mounting base 1 can be selected to be two panels arranged opposite to 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 of one panel toward the other panel. The two positioning grooves 11, the wheel body assembly 2 and the limiting rod 4 are respectively arranged on the side of the two panels facing away from each other. Of course, the two positioning grooves 11, the wheel body assembly 2 and the limiting rod 4 can be respectively arranged on the side surfaces opposite to each other of the two panels. The pull rod 3 can be selected to include a grab rod and two sliding links, the two sliding links are respectively arranged at both ends of the grab rod, and the two sliding links are perpendicular to the grab rod, the two sliding links are parallel to each other and extend in the same direction, so that the two sliding links are respectively movably connected to the two sides of the mounting base 1 opposite to each other along the width direction, and the two sliding links are respectively connected to the limiting rods 4 at the corresponding positions; of course, the mounting base 1 can also be selected to be a rectangular structure, and the first direction is the length direction of the mounting base 1. The pull rod 3 may specifically be a U-shaped structure, with both ends of the U-shaped structure forming two connecting ends of the pull rod 3 , and the middle portion of the U-shaped structure forming a hand-held portion for the user to hold, so that the user applies a pulling force to the pull rod 3 by holding the hand-held portion.

[0072] By respectively arranging the two positioning grooves 11, the wheel body assembly 2 and the limiting rod 4 on the opposite sides of the mounting seat 1, the two ends of the pull rod 3 are movably connected to the opposite sides of the mounting seat 1, and the limiting rod 4 in the two telescopic groups are rotatably connected to the two ends of the pull rod 3, so that one pull rod 3 can control the rotation of the wheel body assembly 2 in the two telescopic groups, and the rotation of the wheel body assembly 2 in the two telescopic groups can be achieved simultaneously under the drive of one pull rod 3, which is convenient for synchronous control of all the wheel body assemblies 2 on the mounting seat 1.

[0073] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, in some embodiments, the wheel body assembly 2 includes two roller members, the two roller members are spaced apart along the first direction, each roller member is rotatably connected to the side of the mounting seat 1, and the limiting rod 4 is rotatably connected to one of the roller members. Specifically, the limiting rod 4 is rotatably connected to the roller member close to the pull rod 3 along the first direction, and a transmission rod 23 is provided between the two roller members, and both ends of the transmission rod 23 are rotatably connected to the two roller members respectively.

[0074] Specifically, two roller members can be selected to be arranged at intervals along the first direction on the side of the mounting seat 1, and each roller member is rotatably connected to the side of the mounting seat 1, and the limiting rod 4 is rotatably connected to a roller member close to the pull rod 3 in the first direction, so that the pull rod 3 can control the movement of a roller member between the extended position and the retracted position through the limiting rod 4. At the same time, since the two ends of the transmission rod 23 are respectively rotatably connected to the two roller members, the rotation of one roller member can drive the rotation of the other roller member through the transmission rod 23, so that the pull rod 3 controls the rotation of the two roller members through the limiting rod 4; the transmission rod 23 can be rotatably connected to the two roller members using bolts. Of course, it is also possible to set a rotating column on both roller members, set through holes at both ends of the transmission rod 23, and rotatably connect the rotating columns on the two roller members to the through holes at both ends of the transmission rod 23, so that the two ends of the transmission rod 23 are respectively rotatably connected to the two roller members.

[0075] The wheel body assembly 2 includes two roller members, which are spaced apart along a first direction and are connected to each other via a transmission rod 23, so that the two roller members can rotate synchronously. The limiting rod 4 is rotationally connected to the roller member close to the pull rod 3 along the first direction, so that the pull rod 3 can control a roller member close to the pull rod 3 in the first direction to switch between an extended position and a retracted position through the limiting rod 4, thereby allowing the pull rod 3 to simultaneously control the two roller members 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 member includes a roller 22 and a rotating rod 21, the roller 22 is installed at one end of the rotating rod 21, the other end of the rotating rod 21 is rotatably connected to the side of the mounting seat 1, and the limiting rod 4 is rotatably connected to the rotating rod 21.

[0077] Specifically, the rotating rod 21 can be selected as a straight rod, and a roller 22 is installed at one end of the rotating rod 21. The roller 22 can be selected as a universal wheel. Of course, it can also be selected as a wheel body that rolls along the first direction. The end of the rotating rod 21 away from the roller 22 can be selected to be rotatably connected to the side of the mounting seat 1. The side of the mounting seat 1 can be provided with a rotating hole, and a rotating column is 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 side of the rotating rod 21 mounting seat 1. Of course, it can also be selected to provide a through hole at the end of the rotating rod 21 away from the roller 22, and a cylindrical protrusion is provided on the side of the mounting seat 1. The cylindrical protrusion is movably plugged into the through hole of the rotating rod 21 so that the rotating rod 21 rotates around the cylindrical protrusion; a protrusion can be selected to be provided on the rotating rod 21, and a through hole can be provided at the end of the limiting rod 4, and the protrusion and the through hole can be movably plugged, so that the limiting rod 4 is rotatably connected to the rotating rod 21.

[0078] The above-mentioned rotating rod 21 can be selectively rotatably connected to the end of the cross rod 41 in the limiting rod 4. When a connecting rod 5 is provided on the pull rod 3, the second rod portion 52 of the connecting rod 5 is rotatably connected to the rotating rod 21, and the connection point between the cross rod 41 and the rotating rod 21 and the connection point between the second rod portion 52 and the rotating rod 21 are arranged at intervals along the length direction of the rotating rod 21.

[0079] By setting a roller member 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 seat 1. The limiting rod 4 is rotatably connected to the rotating rod 21, so that the rotating rod 21 is rotated along the first direction to change the position of the roller 22 in the height direction of the mounting seat 1. The rotation path of the rotating rod 21 is stable, and the roller 22 can be conveniently moved 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 member 24 is provided between the wheel body assembly 2 and the mounting seat 1, and the two ends of the elastic member 24 are respectively connected to the wheel body assembly 2 and the mounting seat 1. When the wheel body assembly 2 is in the extended position, the elastic member 24 is in an elongated state; when the wheel body assembly 2 is in the retracted position, the elastic member 24 is in a free state that is not extended.

[0081] Specifically, the elastic member 24 can be selected as a spring, one end of the spring is connected to the side of the mounting seat 1, and the other end is connected to the rotating rod 21 of the wheel body assembly 2. When the wheel body assembly 2 is in the extended position, the spring is in an elongated state, that is, the spring applies an elastic force to the wheel body assembly 2 in the direction close to the mounting seat 1, thereby assisting the wheel body assembly 2 to move from the extended position to the retracted position; it is also possible to select that when the wheel body assembly 2 is in the retracted position, the elastic member 24 is also in an elongated state, so that when the wheel body assembly 2 is in the retracted position, the elastic force applied by the elastic member 24 to the wheel body assembly 2 keeps the wheel body assembly 2 stable in the retracted position.

[0082] By providing an elastic member 24 between the wheel body assembly 2 and the side of the mounting seat 1, the two ends of the elastic member 24 are respectively connected to the side of the wheel body assembly 2 and the mounting seat 1. When the wheel body assembly 2 is in the extended position, the elastic member 24 is in an elongated state, so that when the wheel body assembly 2 is in the extended position, the elastic member 24 applies an elastic force to the wheel body assembly 2 in the direction of the mounting seat 1, so that the elastic force assists the wheel body assembly 2 to rotate from the extended position to the retracted position.

[0083] The telescopic wheel mechanism provided by the embodiment of the present disclosure is specifically used when the mounting seat 1 is in a stationary state, the wheel assembly 2 is in a retracted position, and the end of the cross bar 41 is located in the sliding groove section 111 and is in an unlocked position. When the wheel assembly 2 needs to be transformed into an extended position, the pull rod 3 is pushed toward the wheel assembly 2 along the first direction, so that the end of the cross bar 41 slides in the sliding groove section 111, and the cross bar 41 applies a driving force along the first direction toward the rotation rod 21 of the wheel assembly 2 in a direction away from the pull rod 3, so that the rotation rod 21 carries the roller 22 to start moving toward the extended position. When the end of the cross bar 41 moves to the connection between the sliding slot section 111 and the limiting slot section 112, the pull rod 3 is rotated clockwise to rotate the pull rod 3 and apply a driving force having a force component perpendicular to the first direction to the cross bar 41 through the inclined rod 42. The driving force is directed toward the limiting slot section 112, so that the end of the cross bar 41 moves from the sliding slot section 111 to the limiting slot section 112, and the pull rod 3 is continuously rotated clockwise to make the end of the cross bar 41 reach the farthest end of the limiting slot section 112 away from the sliding slot section 111. At this time, the limiting rod 4 is in the locked position, and the wheel assembly 2 The wheel assembly 2 is in the extended position, and due to the limiting effect of the limiting groove section 112, the friction force along the first direction received 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 in the extended position to the retracted position, the pull rod 3 is rotated counterclockwise so that the pull rod 3 exerts a driving force perpendicular to the first direction component on the cross bar 41 through the inclined rod 42, and the driving force is directed toward the sliding groove section 111, so that the end of the cross bar 41 moves from the limiting groove section 112 to the sliding groove section 111, and moves away from the wheel assembly 2 in the first direction. Pull the pull rod 3 in the direction away from the wheel body assembly 2, so that the end of the cross bar 41 slides along the sliding groove section 111, and the cross bar 41 drives the rotating rod 21 of the wheel body assembly 2 to rotate toward the direction close to the mounting seat 1, and the elastic force of the elastic member 24 assists the rotating rod 21 to rotate toward the direction close to the mounting seat 1, and the end of the cross bar 41 moves to the farthest end of the sliding groove section 111 away from the limiting groove section 112. At this time, the wheel body 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 body assembly 2 cannot roll, and the mounting seat 1 is suitable for being placed on a plane.

[0084] Reference Figures 1 to 6 As shown, the embodiment of the present disclosure also provides a box body, including an outer shell 6 and a retractable wheel mechanism as described in any of the above items, an installation space is provided at the bottom of the outer shell 6, the retractable wheel mechanism is arranged in the installation space, the wheel body assembly 2 extends out of the installation space when it is in the extended position, and retracts into the installation space when the wheel body assembly 2 is in the retracted position.

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

[0086] By arranging the telescopic wheel mechanism on the box body, the wheel body assembly 2 is in the extended position to reduce the external force required to push the box body, thereby facilitating the rotation of the box body. When the wheel body assembly 2 is in the retracted position, the bottom surface of the box body is flat and can be stably placed on the panel of a car or trailer, thereby facilitating the use of other tools to carry the box body.

[0087] Specifically, the box can be a box structure such as a pet box, a storage box, a travel bag, and a large storage box, and the box structure can be used in a vehicle or in daily use. The present disclosure does not specifically limit the specific shape, size, type, use, etc. of the box.

[0088] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0089] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be 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 the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A telescopic wheel mechanism, characterized in that: It includes a mounting seat, a wheel assembly, a pull rod and a limiting rod; The mounting seat is provided with a connecting groove extending along a first direction, the pull rod is provided with a connecting column, the connecting column is slidably arranged in the connecting groove, and the pull rod can rotate relative to the mounting seat around the connecting column; The wheel assembly is rotatably disposed on the mounting seat, and the wheel assembly has an extended position extending out of the mounting seat and a retracted position retracting the mounting seat; The limiting rod is connected between the pull rod and the wheel assembly, a positioning groove is provided on the mounting seat, the limiting rod is slidably matched with the positioning groove, and the limiting rod has a locking position and an unlocking position in the positioning groove; The pull rod rotates around the connecting column relative to the mounting seat to drive the limiting rod to switch between the locking position and the unlocking position, and when the limiting rod is in the unlocking position, the pull rod slides along the first direction relative to the mounting seat to drive the wheel assembly to switch between the extended position and the retracted position.

2. The telescopic wheel mechanism according to claim 1, characterized in that: The positioning groove comprises a sliding groove section and a limiting groove section which are connected to each other, the sliding groove section and the limiting groove section are arranged at an angle, and the sliding groove section is parallel to the extending direction of the connecting groove; When the limiting rod is in the limiting groove section, it is in limiting cooperation with the limiting groove section to limit the pull rod from sliding relative to the mounting seat along the first direction.

3. The telescopic wheel mechanism according to claim 2, characterized in that: The connecting groove is arranged on the side of the mounting seat, the connecting column is located in the middle area of ​​the pull rod along the first direction, a hand-holding portion is formed at one end of the pull rod along the first direction, and the other end of the pull rod along the first direction is connected to the limiting rod.

4. The telescopic wheel mechanism according to claim 2, characterized in that: The limiting rod includes a cross bar and an oblique rod connected to each other, one end of the cross bar is slidably connected to the positioning groove, and the other end is rotationally connected to the wheel body assembly, one end of the oblique rod is connected to the pull rod, and the other end is movably connected to the middle area of ​​the cross bar.

5. The telescopic wheel mechanism according to claim 1, characterized in that: A connecting rod is further provided between the pull rod and the wheel body assembly, one end of the connecting rod is rotatably connected to the pull rod, and the other end of the connecting rod is rotatably connected to the wheel body assembly.

6. The telescopic wheel mechanism according to claim 5, characterized in that: The connecting rod includes a first rod portion and a second rod portion connected to each other, the first rod portion is rotationally connected to the pull rod, the second rod portion is rotationally connected to the wheel assembly, and the first rod portion and the second rod portion are arranged at an angle.

7. The telescopic wheel mechanism according to claim 1, characterized in that: There are two wheel body assemblies and two limiting rods, and the pull rod has two connecting ends. The two connecting ends of the pull rod are movably connected to the two opposite sides of the mounting seat respectively. A wheel body assembly and a limiting rod are respectively arranged on the two opposite sides of the mounting seat, and the two limiting rods are rotatably connected to the two connecting ends of the pull rod respectively.

8. The telescopic wheel mechanism according to claim 1, characterized in that: The wheel body assembly includes two roller members, the two roller members are arranged at intervals along the first direction, each of the roller members is rotatably connected to the side of the mounting seat, the limiting rod is rotatably connected to one of the roller members, a transmission rod is provided between the two roller members, and both ends of the transmission rod are rotatably connected to the two roller members respectively.

9. The telescopic wheel mechanism according to claim 8, characterized in that: The roller member comprises 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 surface of the mounting seat, and the limiting rod is rotatably connected to the rotating rod.

10. The telescopic wheel mechanism according to any one of claims 1 to 9, characterized in that: An elastic member is provided between the wheel body assembly and the mounting seat, and two ends of the elastic member are respectively connected to the wheel body assembly and the mounting seat. When the wheel body assembly is in the extended position, the elastic member is in an elongated state, and when the wheel body assembly is in the retracted position, the elastic member is in a free state without extension.

11. A box, characterized in that: It comprises a shell and a retractable wheel mechanism as claimed in any one of claims 1 to 10, wherein an installation space is provided at the bottom of the shell, the retractable wheel mechanism is arranged in the installation space, the wheel body assembly extends out of the installation space when in the extended position, and retracts into the installation space when in the retracted position.

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