Pull rod trolley

Abstract

The utility model discloses a draw bar car, including telescopic draw bar, cork base, trundles, bearing, fixed cap and fixed screw, telescopic draw bar and cork base detachable connection, the lateral part of cork base is equipped with the mounting plate, the outer side of mounting plate is equipped with annular bulge, the central position of trundles is equipped with the mounting hole, the bearing is accommodated in the mounting hole, and the fixed cap is equipped with the fixed screw. The annular protrusion is sleeved with an inner ring of the bearing, an outer ring of the bearing abuts against the inner wall of the mounting hole, the first end of the fixing cap is inserted into the annular protrusion, the second end of the fixing cap abuts against the end face of the inner ring of the bearing, and the tail end of the fixing screw penetrates through the mounting plate from the inner side of the mounting plate and then is screwed to the first end of the fixing cap. According to the pull rod trolley, the telescopic pull rod is detachably connected with the bottom support, the trundles are also detachably connected with the bottom support, in the transportation process, the telescopic pull rod and the trundles can be detached, the occupied space of a product is reduced, and when the pull rod trolley is not used, the telescopic pull rod and the trundles can be detached for storage, and the occupied space is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a draw-bar trolley. BACKGROUND

[0002] The common schoolbag draw-bar trolley in the market is usually composed of a draw-bar, a bottom support and a caster, the bottom support can be used for placing a schoolbag, the draw-bar is fixedly connected with the bottom support, and the bottom support is fixedly connected with the caster, such a schoolbag draw-bar trolley cannot be directly disassembled and stored, and occupies a large space during transportation, and when the schoolbag draw-bar trolley is not used, it also occupies a large room space, which brings great inconvenience to storage and causes unnecessary space waste to a small room family. SUMMARY

[0003] The utility model aims at providing a draw-bar trolley.

[0004] According to one aspect of the utility model, a draw-bar trolley is provided, which comprises:

[0005] A telescopic draw-bar;

[0006] A bottom support, the bottom of the telescopic draw-bar is arranged on the bottom support and detachably connected with the bottom support, the side of the bottom support is provided with a mounting plate, the outer side of the mounting plate is provided with an annular protrusion;

[0007] A caster, the center position of the caster is provided with a mounting hole;

[0008] A bearing, the bearing is accommodated in the mounting hole, the inner ring of the bearing is sleeved on the annular protrusion, and the outer ring of the bearing abuts against the inner wall of the mounting hole;

[0009] A fixing cap, the first end of the fixing cap is inserted in the annular protrusion, and the second end of the fixing cap abuts against the end face of the inner ring of the bearing; and

[0010] A fixing screw, the distal end of the fixing screw is threaded through the mounting plate from the inner side of the mounting plate and is screwed on the first end of the fixing cap.

[0011] The utility model discloses a trolley, telescopic pull rod and bottom support detachable connection, the trolley wheel is also detachable connection with bottom support, when needing to disassemble trolley wheel, unscrew the fixing screw, pull out the fixing cap from the annular protrusion on the mounting plate, at this moment can pull down the bearing on the trolley wheel from the annular protrusion, thereby complete the disassembly of trolley wheel, can disassemble telescopic pull rod and trolley wheel in the transportation process, reduce the occupation space of product, when consumer uses, can install telescopic pull rod on bottom support again, the inner ring of bearing on trolley wheel is covered on the annular protrusion on the mounting plate, then the first end of fixing cap is inserted in the annular protrusion, and the end of fixing screw is locked on the first end of fixing cap after passing through the mounting plate, thereby re-installing trolley wheel on bottom support, then can place the luggage on bottom support, use through pulling telescopic pull rod, when not using trolley, can disassemble telescopic pull rod and trolley wheel and store, reduce the occupation space, the installation and removal of telescopic pull rod, trolley wheel are very simple, and when telescopic pull rod, trolley wheel have quality problem, also convenient individually replace telescopic pull rod, trolley wheel.

[0012] In some embodiments, the inner wall of the annular protrusion can be provided with a groove arranged in parallel with the axis of the annular protrusion, the fixing cap comprises an integrated plug-in shaft and a cap body, the outer diameter of the cap body is larger than that of the plug-in shaft, the outer wall of the plug-in shaft is provided with a protruding portion matched with the groove, the plug-in shaft is inserted into the annular protrusion with the protruding portion accommodated in the groove, the cap body is pressed against the end face of the inner ring of the bearing, and the end of the fixing screw is screwed onto the end of the plug-in shaft.

[0013] Therefore, through the cooperation of the protruding portion and the groove, after the plug-in shaft of the fixing cap is inserted into the annular protrusion, the fixing cap cannot rotate relative to the annular protrusion, which can prevent the fixing screw from loosening due to the synchronous rolling of the fixing cap and the trolley wheel when the trolley wheel rolls.

[0014] In some embodiments, a fixing plate can also be included, the fixing plate is provided with a through hole, the fixing plate is arranged at the end of the mounting hole close to the mounting plate, the inner wall of the end of the mounting hole away from the mounting plate is provided with a limiting step, and the annular protrusion is inserted and fixed into the inner ring of the bearing after passing through the through hole.

[0015] Therefore, the fixing plate and the limiting step can jointly ensure that the bearing installed in the mounting hole cannot fall out of the mounting hole, so that the bearing and the trolley wheel form an integral whole, and the bearing cannot fall out during the installation and removal of the trolley wheel.

[0016] In some embodiments, a cover body can also be included, the periphery of the cover body is provided with a plurality of buckles, the trolley wheel is provided with a plurality of clamping grooves matched with the buckles, and the cover body covers the trolley wheel to cover the mounting hole and the fixing cap.

[0017] Therefore, the cover body can cover and protect the fixing cap and the mounting hole, and improve the aesthetic appearance of the trolley wheel.

[0018] In some embodiments, the periphery of the root of the annular protrusion can be provided with an annular step, the height of the annular step being less than the height of the annular protrusion, and the annular step being inserted into the through hole.

[0019] In this way, the annular step can improve the strength of the annular protrusion, and the insertion of the annular step into the through hole can also improve the stability of the rotation of the caster.

[0020] In some embodiments, the number of mounting plates, casters, bearings, fixing caps and fixing screws is two, and the two mounting plates are respectively located on both sides of the bottom support, and the two casters are respectively arranged on the two mounting plates.

[0021] In this way, two casters are symmetrically mounted on both sides of the bottom support, so that the trolley can move stably.

[0022] In some embodiments, the telescopic handle can be provided with a cross beam, the cross beam is provided with a detachable clasp, the clasp is provided with a slot for fixing the schoolbag, and the side of the slot is provided with a notch.

[0023] In this way, when the schoolbag is placed on the bottom support, the handle strap on the schoolbag can be fixed in the slot through the notch on the clasp, so that the schoolbag will not easily fall off the bottom support during the movement of the trolley. Since the clasp is detachably connected to the cross beam, the user can also detach the clasp from the cross beam according to the need, then align the notch on the clasp with the handle strap on the schoolbag, fix the handle strap in the slot through the notch on the clasp, and then reinstall the clasp on the cross beam. The use mode varies from person to person.

[0024] In some embodiments, the telescopic handle can be provided with a fixing portion, and the fixing portion is provided with a fixing hole.

[0025] In this way, when the schoolbag is placed on the bottom support, the shoulder strap of the schoolbag can be hung on the fixing hole, further ensuring that the schoolbag will not easily fall off the bottom support during the movement of the trolley.

[0026] In some embodiments, a clamping protrusion, a base and a spring can also be included, the bottom support is provided with a mounting seat, the mounting seat is provided with an insertion cavity, the side wall of the insertion cavity is provided with a through hole, the telescopic handle is provided with a through hole near the bottom of the telescopic handle, the base is provided with a containing cavity, one end of the spring is abutted against the inner bottom of the containing cavity, one end of the clamping protrusion is abutted against the other end of the spring, the base is arranged in the telescopic handle, the other end of the clamping protrusion passes through the through hole and extends out of the surface of the telescopic handle, and the bottom of the telescopic handle is inserted into the insertion cavity and the end of the clamping protrusion passes through the through hole and extends out of the surface of the mounting seat.

[0027] Therefore, when the telescopic rod needs to be disassembled, the engaging protrusion is pressed to make the engaging protrusion retreat from the insertion hole to the plug-in cavity on the mounting seat. At this time, the bottom of the telescopic rod can be pulled out from the plug-in cavity on the mounting seat to complete the disassembly of the telescopic rod. When the telescopic rod needs to be installed, the bottom of the telescopic rod is inserted into the plug-in cavity. Under the elastic force of the spring, when the end of the engaging protrusion extends from the surface of the mounting seat, the installation of the telescopic rod is completed. The installation and disassembly of the telescopic rod are very convenient.

[0028] In some embodiments, a square base may be provided at the bottom of the snap-fitting protrusion, a snap-fitting groove may be provided on the square base, the cross-section of the accommodating cavity is square, a protrusion adapted to the snap-fitting groove is provided on the side wall of the accommodating cavity, the square base is accommodated in the accommodating cavity and the protrusion is accommodated in the snap-fitting groove, and the square base can slide along the protrusion in the accommodating cavity.

[0029] Thus, through the cooperation between the protrusion and the snap-fit ​​groove, the square base can move smoothly in the accommodating cavity, ensuring that the snap-fit ​​protrusion can smoothly extend from the surface of the mounting seat or retract from the through hole into the insertion cavity on the mounting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of a drawbar vehicle according to one embodiment of the present invention;

[0031] Figure 2 for Figure 1 A schematic structural diagram of the pull-bar vehicle from another perspective is shown;

[0032] Figure 3 for Figure 1 The schematic diagram of the disassembled structure of the drawbar car shown;

[0033] Figure 4 for Figure 2 The enlarged structural diagram of the A position in the drawbar car shown;

[0034] Figure 5 for Figure 2 The schematic diagram of the disassembled structure of the drawbar car shown;

[0035] Figure 6 for Figure 5 Schematic diagram of the disassembled structure of the clamping protrusion, base and spring in the drawbar car shown;

[0036] Figure 7 for Figure 5 The schematic diagram of the disassembled structure of the engaging protrusion, base and spring in the drawbar vehicle shown is shown from another perspective. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings.

[0038] Figures 1 to 7 The structure of the trolley is shown schematically.

[0039] Reference Figures 1 to 7 , the trolley comprises a telescopic pull rod 1, a bottom support 2, a caster wheel 3, a bearing 4, a fixing cap 5 and a fixing screw 6. In addition, the trolley can further comprise a fixing plate 7, a cover 8, a clamping protrusion 9, a base 10 and a spring 110.

[0040] The bottom of the telescopic pull rod 1 is mounted on the bottom support 2, and the telescopic pull rod 1 is detachably connected with the bottom support 2. Specifically, refer to Figures 1 to 3 、 Figure 5 The telescopic pull rod 1 is in a U shape, two longitudinal mounting seats 25 are formed on the bottom support 2, the two mounting seats 25 are respectively located at two corner positions of the bottom support 2, a plug-in cavity 251 is formed on the mounting seat 25, a plug-in hole 252 is formed on the side wall of the plug-in cavity 251, a through hole 14 is formed on the telescopic pull rod 1 near the bottom of the telescopic pull rod 1, the base 10 is mounted in the telescopic pull rod 1 and located at a position near the bottom of the telescopic pull rod 1, refer to Figure 6 and Figure 7 A containing cavity 101 is formed on the base 10, the bottom of the spring 110 is pressed against the inner bottom of the containing cavity 101, the bottom of the clamping protrusion 9 is pressed against the top of the spring 110, the top of the clamping protrusion 9 passes through the through hole 14 on the telescopic pull rod 1 and extends out of the surface of the telescopic pull rod 1, the bottom of the telescopic pull rod 1 is plugged into the two plug-in cavities 251 and the end of the clamping protrusion 9 passes through the plug-in hole 252 on the mounting seat 25 and extends out of the surface of the mounting seat 25, since the telescopic pull rod 1 is in a U shape, the number of the clamping protrusion 9, the base 10 and the spring 110 is two, the bottoms of the two rod bodies of the telescopic pull rod 1 are respectively mounted in the two mounting seats 25 through a set of clamping protrusion 9, base 10 and spring 110, when the telescopic pull rod 1 needs to be disassembled, the clamping protrusion 9 is pressed, so that the clamping protrusion 9 retreats from the plug-in hole 252 to the plug-in cavity 251 on the mounting seat 25, at this time, the bottoms of the two rod bodies of the telescopic pull rod 1 can be pulled out of the plug-in cavities 251 on the two mounting seats 25, the disassembly of the telescopic pull rod 1 is completed, when the telescopic pull rod 1 needs to be assembled, the bottoms of the two rod bodies of the telescopic pull rod 1 are respectively plugged into the plug-in cavities 251 on the two mounting seats 25, under the elastic force of the spring 110, when the end of the clamping protrusion 9 extends out of the surface of the mounting seat 25, the assembly of the telescopic pull rod 1 is completed, and the assembly and disassembly of the telescopic pull rod 1 are very convenient.

[0041] Refer to Figure 6 and Figure 7The bottom of the clamping protrusion 9 is formed with a square base 91, the side of the square base 91 is formed with a clamping groove 92, the cross section of the accommodating cavity 101 on the base 10 is square, the side wall of the accommodating cavity 101 is formed with a protrusion 1011 matched with the clamping groove 92, the square base 91 is accommodated in the accommodating cavity 101 and the protrusion 1011 is accommodated in the clamping groove 92, the square base 91 can slide along the protrusion 1011 in the accommodating cavity 101, so that the square base 91 can be smoothly moved in the accommodating cavity 101 through the cooperation of the protrusion 1011 and the clamping groove 92, ensuring that the clamping protrusion 9 can be smoothly extended from the surface of the mounting seat 25 or withdrawn into the insertion cavity 251 on the mounting seat 25 from the insertion hole 252.

[0042] Referring to Figures 1 to 3 , Figure 5 , the side of the bottom support 2 is formed with two mounting plates 21, the two mounting plates 21 are respectively located on the two sides of the bottom support 2, the two bottom supports 2 are the same in structure and style, the two casters 3 are respectively mounted on the two mounting plates 21, the two casters 3 are the same in structure, and the connection structure of the two casters 3 and the mounting plate 21 is the same, and the connection structure of one caster 3 and the mounting plate 21 is described in detail; referring to Figure 3 and Figure 5 , the outer side of the mounting plate 21 is formed with an annular protrusion 22, the central position of the caster 3 is formed with a mounting hole 31, the inner wall of the end of the mounting hole 31 away from the mounting plate 21 is formed with a limiting step 32, the bearing 4 is accommodated in the mounting hole 31, the outer ring of the bearing 4 has a radius greater than the inner diameter of the limiting step 32, the fixing plate 7 is mounted on the end of the mounting hole 31 close to the mounting plate 21, the fixing plate 7 can be fixed on the caster 3 by screws, the fixing plate 7 is formed with a through hole 71, the inner diameter of the through hole 71 is smaller than the radius of the outer ring of the bearing 4, the annular protrusion 22 is inserted and fixed in the inner ring of the bearing 4 after passing through the through hole 71 of the fixing plate 7, the inner ring of the bearing 4 is sleeved on the annular protrusion 22, and the outer ring of the bearing 4 abuts against the inner wall of the mounting hole 31, so that the fixing plate 7 and the limiting step 32 can jointly ensure that the bearing 4 mounted in the mounting hole 21 cannot be detached from the mounting hole 21, so that the bearing 4 and the caster 3 form an integral whole, and the bearing 4 cannot fall out during the mounting and dismounting process of the caster 3, and the caster 3 and the bearing 4 can rotate on the annular protrusion 22 on the mounting plate 21 as an integral whole to realize the movement of the trolley.

[0043] Referring to Figure 3 , the periphery of the root of the annular protrusion 22 is formed with a ring-shaped step 24, the height of the ring-shaped step 24 is smaller than the height of the annular protrusion 22, the ring-shaped step 24 is inserted into the through hole 71, the outer diameter of the ring-shaped step 24 is slightly smaller than the inner diameter of the through hole 71, and the ring-shaped step 24 can improve the strength of the annular protrusion 22, and the insertion of the ring-shaped step 24 into the through hole 71 can also improve the stability of the rotation of the caster 3.

[0044] See Figure 3 and Figure 5 A groove 23 is formed on the inner wall of the annular protrusion 22. The groove 23 is arranged parallel to the axis of the annular protrusion 22. The first end of the fixing cap 5 ( Figure 3 The left end of the fixing cap 5) is inserted into the annular protrusion 22, and the second end of the fixing cap 5 ( Figure 3 The right end of the fixing cap 5 in the middle is pressed against the end face of the inner ring of the bearing 4. The end of the fixing screw 6 passes through the mounting plate 21 from the inner side of the mounting plate 21 and is screwed onto the first end of the fixing cap 5. Specifically, the fixing cap 5 includes an integrally connected plug-in shaft 51 and a cap body 52. ​​The outer diameter of the cap body 52 is larger than the outer diameter of the plug-in shaft 51. A protrusion 511 adapted to the groove 23 is formed on the outer wall of the plug-in shaft 51. The plug-in shaft 51 is inserted into the annular protrusion 22 and the protrusion 511 is accommodated in the groove 23. The cap body 52 is pressed against the inner ring of the bearing 4. On the end face of the inner ring, the end of the fixing screw 6 passes through the mounting plate 21 from the inner side of the mounting plate 21 and is screwed onto the end of the plug-in shaft 51 of the fixing cap 5. The fixing screw 6 can lock the fixing cap 5, the caster 3, and the fixing plate 7 on the mounting plate 21. Through the cooperation between the protrusion 511 and the groove 23, after the plug-in shaft 51 of the fixing cap 5 is inserted into the annular protrusion 22, the fixing cap 5 will not rotate relative to the annular protrusion 22, which can prevent the fixing cap 5 from rolling synchronously with the caster 3 when the caster 3 rolls, causing the fixing screw 6 to loosen.

[0045] See Figure 3 and Figure 5 A plurality of buckles 81 are formed around the periphery of the cover body 8, and a plurality of slots 33 adapted to the buckles 81 are formed at corresponding positions on the caster 3. The cover body 8 is covered on the caster 3 to cover the mounting hole 31 and the fixing cap 5. The buckles 81 on the cover body 8 are snapped into the slots 33 on the caster 3. The cover body 8 can not only cover and protect the fixing cap 5 and the mounting hole 31 but also improve the aesthetics of the caster 3.

[0046] The number of mounting plates 21, casters 3, bearings 4, fixing caps 5, fixing screws 6, fixing plates 7 and cover bodies 8 are all two. One caster 3, one bearing 4, one fixing cap 5, one fixing screw 6, one fixing plate 7, and one cover body 8 are installed on one mounting plate 21 as a group of components, and another caster 3, another bearing 4, another fixing cap 5, another fixing screw 6, another fixing plate 7, and another cover body 8 are installed on another mounting plate 21 as another group of components.

[0047] See Figures 1 to 5The telescopic pull rod 1 is provided with a cross beam 11, and a detachable buckle is arranged on the cross beam 11. Specifically, the two ends of the cross beam 11 are fixed on the two rod bodies of the telescopic pull rod 1, a transverse slot can be formed on the cross beam 11, a hole is formed on one side wall of the transverse slot, and an inclined protruding buckle is formed on the buckle 12. The buckle 12 is inserted into the transverse slot on the cross beam 11, and the protruding buckle on the buckle 12 is clamped in the hole on the side wall of the transverse slot. In addition, a slot 121 is formed on the buckle 12, and a notch 122 is formed on the side of the slot 121. When the backpack is placed on the bottom support 2, the handle strap on the backpack can be fixed in the slot 121 through the notch 122 on the buckle 12, so that the backpack will not easily fall off the bottom support 2 during the movement of the pull rod cart. Since the buckle 12 is detachably connected with the cross beam 11, the user can also detach the buckle 12 from the cross beam 11 according to the need, then align the notch 122 on the buckle 12 with the handle strap on the backpack, fix the handle strap in the slot 121 through the notch 122 on the buckle 12, and then reinstall the buckle 12 on the cross beam 11. The use mode is different for different people.

[0048] Referring to Figures 1 to 3 , Figure 5 The telescopic pull rod 1 is provided with a fixed portion 13, and a fixed hole 131 is formed on the fixed portion 13. When the backpack is placed on the bottom support 2, the shoulder strap of the backpack can be hung on the fixed hole 131, so as to further ensure that the backpack will not easily fall off the bottom support 2 during the movement of the pull rod cart.

[0049] Referring to Figures 1 to 5, the utility model discloses the trolley, need to disassemble telescopic pull rod 1, press the clamping protrusion 9, make the clamping protrusion 9 from the hole -in -hole 252 retreat to the insertion cavity 251 on the mounting seat 25, at this moment can the bottom of telescopic pull rod 1 from the insertion cavity 251 on the mounting seat 25 pull out, complete telescopic pull rod 1's disassembly, need to disassemble the trundle 3, unscrew the fixed screw 6, remove the cover 8, the fixed cap 5 is pulled out from the annular protrusion 22 on the mounting plate 21, at this moment can the bearing 4 on the trundle 3 be pulled down from the annular protrusion 22, thereby complete the trundle 3's disassembly, in the transportation, can remove telescopic pull rod 1 and two trundles 3, reduce the occupation space of product, when not using the trolley, telescopic pull rod 1 and two trundles 3 can also be removed and stored, reduce the occupation space, need to install telescopic pull rod 1, the bottom of telescopic pull rod 1 is inserted in the insertion cavity 251 on the mounting seat 25, under the elastic force of spring 110, when the end of clamping protrusion 9 extends from the surface of mounting seat 25, telescopic pull rod 1 is installed, and the installation and removal of telescopic pull rod 1 are very convenient, when consumer uses, can the inner ring of bearing 4 on the trundle 3 be covered on the annular protrusion 22 on the mounting plate 21, then the insertion shaft 51 of fixed cap 5 is inserted in the annular protrusion 22, and the tail end of fixed screw 6 is locked on the end of insertion shaft 51 of fixed cap 5 after passing through mounting plate 21, then cover 8 is installed on the trundle 3, thereby the trundle 3 is reinstalled on bottom support 2, the utility model discloses the trolley, can place luggage on bottom support 2, use by pulling telescopic pull rod 1, and telescopic pull rod 1 and bottom support 2 are detachably connected, and two trundles 3 and bottom support 2 are also detachably connected, in the transportation and when consumer does not use the trolley, telescopic pull rod 1 and two trundles 3 can be removed and stored, reduce the occupation space, and the installation and removal of telescopic pull rod 1 and trundle 3 are very simple, and when telescopic pull rod 1 and trundle 3 have quality problems, telescopic pull rod 1 and trundle 3 are also conveniently replaced.

[0050] The above only some embodiments of the utility model. For the ordinary skilled person in the art, under the premise of not departing from the utility model creative concept, still can make a number of deformation and improvement, these all belong to the protection scope of the utility model.

Claims

1. A trolley, characterized in that: include: Telescopic pull rod; A bottom bracket, the bottom of the telescopic pull rod is arranged on the bottom bracket and is detachably connected to the bottom bracket, a mounting plate is provided on the side of the bottom bracket, and an annular protrusion is provided on the outer side of the mounting plate; Casters, wherein a mounting hole is provided at the center of the casters; A bearing is accommodated in the mounting hole, the inner ring of the bearing is sleeved on the annular protrusion, and the outer ring of the bearing abuts against the inner wall of the mounting hole; a fixing cap, wherein a first end of the fixing cap is inserted into the annular protrusion, and a second end of the fixing cap is pressed against an end surface of an inner ring of the bearing; and A fixing screw, wherein the end of the fixing screw passes through the mounting plate from the inner side of the mounting plate and is screwed onto the first end of the fixing cap.

2. The trolley according to claim 1, characterized in that: The inner wall of the annular protrusion is provided with a groove arranged parallel to the axis of the annular protrusion. The fixing cap includes a plug-in shaft and a cap body that are integrally connected. The outer diameter of the cap body is larger than the outer diameter of the plug-in shaft. A protrusion that adapts to the groove is provided on the outer wall of the plug-in shaft. The plug-in shaft is inserted into the annular protrusion and the protrusion is accommodated in the groove. The cap body is pressed against the end face of the inner ring of the bearing, and the end of the fixing screw is screwed onto the end of the plug-in shaft.

3. The trolley according to claim 1, characterized in that: It also includes a fixing plate, which is provided with a through hole. The fixing plate is arranged on the port of the mounting hole close to the mounting plate. A circle of limiting steps is provided on the inner wall of the port of the mounting hole away from the mounting plate. The annular protrusion passes through the through hole and is inserted and fixed in the inner ring of the bearing.

4. The trolley according to claim 1, characterized in that: It also includes a cover body, a plurality of buckles are arranged on the periphery of the cover body, a plurality of slots adapted to the buckles are arranged on the caster, and the cover body is closed on the caster to cover the mounting hole and the fixing cap.

5. The trolley according to claim 3, characterized in that: A circle of annular steps is provided on the periphery of the root of the annular protrusion. The height of the annular steps is smaller than the height of the annular protrusion, and the annular steps are inserted into the through hole.

6. The trolley according to claim 1, characterized in that: The number of the mounting plates, casters, bearings, fixing caps and fixing screws is two, the two mounting plates are respectively located on both sides of the base, and the two casters are respectively arranged on the two mounting plates.

7. The trolley according to claim 1, characterized in that: The telescopic pull rod is provided with a crossbeam, the crossbeam is provided with a detachable buckle, the buckle is provided with a slot for fixing the schoolbag, and a notch is provided on the side of the slot.

8. The drawbar vehicle according to claim 1, characterized in that: The telescopic pull rod is provided with a fixing portion, and the fixing portion is provided with a fixing hole.

9. The drawbar vehicle according to any one of claims 1 to 8, characterized in that: It also includes a clamping protrusion, a base and a spring, a mounting seat is provided on the base, an inserting cavity is provided on the mounting seat, an insertion hole is provided on the side wall of the inserting cavity, a through hole is provided on the telescopic rod near the bottom of the telescopic rod, and an accommodating cavity is provided on the base, one end of the spring is pressed against the inner bottom of the accommodating cavity, one end of the clamping protrusion is pressed against the other end of the spring, the base is provided in the telescopic rod, the other end of the clamping protrusion passes through the through hole and extends from the surface of the telescopic rod, the bottom of the telescopic rod is inserted in the inserting cavity and the end of the clamping protrusion passes through the insertion hole and extends from the surface of the mounting seat.

10. The drawbar vehicle according to claim 9, characterized in that: A square base is provided at the bottom of the snap-fitting protrusion, a snap-fitting groove is provided on the square base, the cross-section of the accommodating cavity is square, and a protrusion adapted to the snap-fitting groove is provided on the side wall of the accommodating cavity. The square base is accommodated in the accommodating cavity and the protrusion is accommodated in the snap-fitting groove. The square base can slide along the protrusion in the accommodating cavity.

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