Pull rod type schoolbag convenient for going upstairs and downstairs

Abstract

The utility model relates to a pull rod type schoolbag convenient for going upstairs and downstairs, which comprises a schoolbag body, the pull rod is connected to the schoolbag body in a manner of stretching and retracting relative to the schoolbag body; the schoolbag further comprises a track assembly arranged on the back of the schoolbag body, the track assembly comprises a track support, and the side, close to the bottom of the schoolbag body, of the track support is rotationally connected to the back of the schoolbag body with the axis extending left and right as the rotating axis. The first state is folded relative to the schoolbag body and used for going upstairs, and the second state is unfolded relative to the schoolbag body and used for going downstairs. The crawler belt support is arranged on the schoolbag body, the crawling crawler belt can be rotatably wound on the crawler belt support, and the elastic piece acts on the crawler belt support and enables the crawler belt support to have the trend of deflecting towards one side far away from the schoolbag body to be opened all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of pull-rod type schoolbags, in particular to a pull-rod type schoolbag which is convenient for going up and down stairs. Background Art

[0002] A trolley backpack is a backpack with a trolley, with rollers at the bottom and a retractable trolley at the back. Since this trolley backpack can be dragged, it is loved by the new generation of children and middle school students. For example, the Chinese utility model patent application with application number CN202121751746.8 (authorization announcement number: CN216135357U) discloses this trolley backpack structure.

[0003] However, the existing trolley-type backpacks still have certain shortcomings. When in use, the existing trolley-type backpacks are basically dragged on a flat ground. When the road surface is uneven, especially when going up and down stairs, the user needs to lift the backpack for carrying, and the carrying process is relatively laborious. In some cases, most of the target groups of the trolley-type backpacks are middle school students. Due to their limited carrying strength, the trolley-type backpacks often collide when going up and down stairs, which reduces the service life of the trolley-type backpacks.

[0004] Therefore, the existing drawbar type school bag also needs to be further improved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a trolley-type backpack which is convenient for going up and down stairs in view of the current status of the prior art. The trolley-type backpack can effectively adapt to the scenes of going up and down stairs, and is more convenient and labor-saving when going up and down stairs.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a pull-rod type schoolbag convenient for going up and down stairs, comprising:

[0007] The school bag body has rollers at the bottom;

[0008] A pull rod connected to the backpack body in a manner that it can be extended and retracted relative to the backpack body;

[0009] The backpack also includes a track assembly disposed on the back of the backpack body, the track assembly comprising:

[0010] A crawler bracket, adjacent to the bottom of the backpack body, is rotatably connected to the back of the backpack body with an axis extending left and right as a rotation axis, and has a first state of being folded relative to the backpack body for climbing stairs and a second state of being unfolded relative to the backpack body for descending stairs;

[0011] A crawler track is rotatably arranged on the crawler track bracket, and when the crawler track bracket is in a first state, the extension direction of the crawler track is parallel to the extension direction of the back side wall of the backpack body, and when the crawler track bracket is in a second state, the extension direction of the crawler track is arranged at an angle to the extension direction of the back side wall of the backpack body;

[0012] The elastic member acts on the track bracket and makes the track bracket always have a tendency to deflect and open toward a side away from the backpack body.

[0013] In order to install the crawler track on the track frame, the track frame includes a first support rod and a second support rod arranged in parallel and spaced apart, the first support rod is provided with a first track wheel that can rotate freely, and the second support rod is provided with a second track wheel that can rotate freely, and the crawler track is rotated around the first track wheel and the second track wheel.

[0014] In order to enable the crawling track to effectively contact the stairs and thus ensure the stability of the crawling track during rotation, the crawling track has two left-right intervals. Correspondingly, the first support rod is also provided with two first track wheels arranged left-right intervals, and the second support rod is also provided with two second track wheels arranged left-right intervals.

[0015] In order to realize the rotational connection between the track bracket and the backpack body, the back of the backpack body has an outwardly protruding mounting seat, and the first support rod is rotatably connected to the mounting seat. The elastic member is a torsion spring mounted on the first support rod, and the first end of the torsion spring is against the mounting seat, and the second end is against the back side wall of the backpack body.

[0016] In order to enable the track bracket to stably remain in the first state when climbing stairs, a spring buckle with a snap-on snap is further provided on the back side wall of the backpack body. When the track bracket is in the first state, the second support rod is snapped into the snap-on snap of the spring buckle.

[0017] In order to better conform to the user's posture and movements when going downstairs and improve the user experience, the angle between the track bracket in the second state and the back side wall of the backpack body is recorded as α, where the value range of α is: 30°≤α≤120°.

[0018] In order to prevent the track assembly from opening at an excessively large angle, a connecting rod assembly is also included for limiting the opening angle of the track bracket relative to the backpack body.

[0019] As an improvement, the connecting rod assembly includes a first connecting rod and a second connecting rod, the first end of the first connecting rod is rotatably connected to the back side wall of the backpack body, the second end is rotatably connected to the first end of the second connecting rod, and the second end of the second connecting rod is rotatably connected to the track bracket.

[0020] Considering that the distance between the first support rod and the second support rod is too large, the crawling track will have a large bend and cannot effectively contact the corresponding stairs, affecting the stability of the rotation of the crawling track. In order to solve this problem, the track bracket also includes a third support rod located between the first support rod and the second support rod, and the third support rod is provided with a third track wheel that can rotate freely, and the crawling track is in rotational contact with the third track wheel.

[0021] In order to be adapted and connected with the above-mentioned connecting rod assembly, the second end of the second connecting rod is rotatably connected to the third supporting rod.

[0022] Compared with the prior art, the utility model has the following advantages: the pull-rod backpack of the utility model can effectively adapt to the scenes of going upstairs and going downstairs. When going upstairs, the crawler bracket can be folded relative to the backpack body and placed in the first state. In the first state, the extension direction of the crawler track is parallel to the extension direction of the back side wall of the backpack body. When the user (especially the middle school student user group) pulls the backpack upstairs, the crawler track can effectively contact each step of the stairs and rotate around the crawler bracket, and the operation process is more labor-saving. When going downstairs, the crawler bracket can be unfolded relative to the backpack body and placed in the second state. In the second state, since the extension direction of the crawler track is set at an angle to the extension direction of the back side wall of the backpack body, the user can make the crawler track effectively contact the corresponding step of the stairs without bending over, so that it can stably rotate around the crawler bracket, and the operation process of going downstairs is also more labor-saving. On this basis, the elastic member provided can enable the track bracket to always be deflected and opened toward the side away from the backpack body, that is, the track bracket and the crawling track have a certain angular floating space (with a buffering effect). Even if the user unconsciously operates the backpack body at different angles, the crawling track can always maintain an effective contact state with the corresponding steps of the stairs, further ensuring its rotation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a pull-rod type schoolbag according to an embodiment of the utility model (the track bracket is in a state of being folded relative to the schoolbag body);

[0024] Figure 2 It is a three-dimensional structural schematic diagram of a pull-rod type schoolbag according to an embodiment of the utility model (the track bracket is in a state of being unfolded relative to the schoolbag body);

[0025] Figure 3This is a structural schematic diagram of a pull-rod schoolbag according to an embodiment of the utility model in a state of going up stairs;

[0026] Figure 4 This is a schematic structural diagram of a trolley-type backpack according to an embodiment of the utility model in a state of going down stairs (the track bracket is not in contact with the stair steps and is in a fully extended state);

[0027] Figure 5 This is a schematic structural diagram of a trolley-type backpack according to an embodiment of the utility model in a state of going down stairs (the end of the track bracket is in contact with the stair step and is in a non-fully extended state). DETAILED DESCRIPTION

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0030] Figure 1-Figure 5 The utility model shows a trolley-type backpack which is convenient for going up and down stairs. The trolley-type backpack comprises a backpack body 10, rollers 13, a trolley 14, a track assembly and a connecting rod assembly.

[0031] There are four rollers 13, which are arranged at the bottom of the backpack body 10, specifically at the four corners. The pull rod 14 is connected to the top of the backpack body 10, and specifically can adopt an existing conventional telescopic pull rod structure. When it is extended, its top is higher than the top of the backpack body 10, so that it is convenient for users to hold it.

[0032] The track assembly is arranged on the back of the backpack body 10. The track assembly includes a track bracket 20, a crawling track 24 and an elastic member 25. Specifically, the lower part of the back side wall of the backpack body 10 has a recessed area 100 for accommodating the track assembly and the connecting rod assembly therein.

[0033] The track bracket 20 is rotatably connected to the back of the backpack body 10 with the axis extending left and right (i.e., the axis of the first support rod 21) as the rotation axis, and has a first state of being folded relative to the backpack body 10 and used for climbing stairs (see Figure 3) and the second state in which the backpack body 10 is unfolded and used for going down stairs (see Figure 4 and Figure 5 ). Specifically, the crawler support 20 includes a first support rod 21 and a second support rod 22 arranged in parallel and spaced apart, and a third support rod 23 located between the first support rod 21 and the second support rod 22. The two ends of the first support rod 21, the two ends of the second support rod 22, and the two ends of the third support rod 23 are respectively connected together by two fixing rods to form a support structure. Both ends of the first support rod 21 are also provided with a first track wheel 210 that can rotate freely, both ends of the second support rod 22 are also provided with a second track wheel 220 that can rotate freely, and both ends of the third support rod 23 are also provided with a third track wheel 230 that can rotate freely. The crawler tracks 24 have two left and right spaced apart arrangements, and both crawler tracks 24 are rotated and wound between the first track wheel 210 and the second track wheel 220 on the corresponding side, and the middle part thereof is also in sliding contact with the corresponding third track wheel 230.

[0034] The back of the backpack body 10 has a mounting seat 11 protruding outward, and the middle part of the first support rod 21 is rotatably connected to the mounting seat 11. When the crawler support 20 of this embodiment is in the first state, the extension direction of the crawler track 24 is parallel to the extension direction of the back side wall of the backpack body 10. When the crawler support 20 is in the second state, the extension direction of the crawler track 24 is set at an angle to the extension direction of the back side wall of the backpack body 10;

[0035] The elastic member 25 of this embodiment is a torsion spring sleeved on the first support rod 21, and there are two torsion springs, which are respectively located on the left and right sides of the mounting seat 11. The first ends of the two torsion springs are against the mounting seat 11, and can be fixedly connected to the mounting seat 11 or inserted into a hole in the mounting seat 11, and the second ends of the torsion springs are against the back side wall of the backpack body 10. Under the elastic force of the torsion spring, the track bracket 20 always has a tendency to deflect toward the side away from the backpack body 10 and open.

[0036] The upper area of ​​the back side wall of the backpack body 10 is also provided with a snap buckle 12 with a snap-in. When the track bracket 20 is folded relative to the backpack body 10, the second support rod 22 can overcome the elastic force of the torsion spring and snap into the snap-in of the snap buckle 12, so that the track bracket 20 remains in the first state. In order to better meet the user's posture and movements when going downstairs and improve the user experience, the angle between the track bracket 20 in the second state and the back side wall of the backpack body 10 is recorded as α, wherein the value range of α is preferably: 30°≤α≤120°. In order to avoid the track assembly from opening at too large an angle, a connecting rod assembly is also provided between the backpack body 10 and the track bracket 20 for limiting the opening angle of the track bracket 20 relative to the backpack body 10. The connecting rod assembly includes a first connecting rod 31 and a second connecting rod 32. The first end of the first connecting rod 31 is rotatably connected to the back side wall of the backpack body 10, and the second end is rotatably connected to the first end of the second connecting rod 32. The second end of the second connecting rod 32 is rotatably connected to the track frame 20. When the track frame 20 is in the first state, the first connecting rod 31 and the second connecting rod 32 are folded together. When the track frame 20 is in the second state, the first connecting rod 31 and the second connecting rod 32 are relatively unfolded and are basically in the same straight line.

[0037] The pull rod 14-type backpack of the utility model can effectively adapt to the scenes of going upstairs and going downstairs. When going upstairs, the crawler support 20 can be folded relative to the backpack body 10 and placed in a first state. In the first state, the extension direction of the crawler track 24 is parallel to the extension direction of the back side wall of the backpack body 10. When the user (especially the middle school user group) pulls the backpack upstairs, the crawler track 24 can effectively contact the corresponding steps of the stairs and rotate around the crawler support 20, and the operation process is more labor-saving. When going downstairs, the steps of the stairs located below are in contact, and the crawler support 20 can be unfolded relative to the backpack body 10 and placed in a second state. In the second state, since the extension direction of the crawler track 24 is set at an angle to the extension direction of the back side wall of the backpack body 10, the user can make the crawler track 24 effectively contact the corresponding steps of the stairs without bending over, so that it can stably rotate around the crawler support 20, and the operation process of going downstairs is also more labor-saving. On this basis, the elastic member 25 can make the track bracket 20 always deflect toward the side away from the backpack body 10 and open, that is, the track bracket 20 and the crawling track 24 have a certain angular floating space (with a buffering effect). Even if the user unconsciously operates the backpack body 10 at different angles, the crawling track 24 can always maintain an effective contact state with the corresponding step of the stairs, further ensuring its rotation stability.

Claims

1. A trolley-type school bag that is convenient for going up and down stairs, comprising: The school bag body (10) has a roller (13) at the bottom; A pull rod (14) connected to the backpack body (10) in a manner that it can be extended and retracted relative to the backpack body (10); The characteristic is that it also includes a track assembly arranged on the back of the backpack body (10), and the track assembly includes: A crawler support (20) is rotatably connected to the back of the backpack body (10) on one side adjacent to the bottom of the backpack body (10) with an axis extending left and right as a rotation axis, and has a first state of being folded relative to the backpack body (10) for climbing stairs and a second state of being unfolded relative to the backpack body (10) for descending stairs; A crawler belt (24) is rotatably mounted on the crawler belt bracket (20); when the crawler belt bracket (20) is in a first state, the extension direction of the crawler belt (24) is parallel to the extension direction of the back side wall of the backpack body (10); when the crawler belt bracket (20) is in a second state, the extension direction of the crawler belt (24) is arranged at an angle to the extension direction of the back side wall of the backpack body (10); The elastic member (25) acts on the track bracket (20) and makes the track bracket (20) always have a tendency to deflect and open toward a side away from the backpack body (10).

2. The trolley-type backpack for going up and down stairs according to claim 1, characterized in that: The crawler support (20) comprises a first support rod (21) and a second support rod (22) which are arranged in parallel and spaced apart from each other; the first support rod (21) is provided with a first crawler wheel (210) which can rotate freely; the second support rod (22) is provided with a second crawler wheel (220) which can rotate freely; and the crawler belt (24) is rotatably arranged between the first crawler wheel (210) and the second crawler wheel (220).

3. The trolley-type backpack for going up and down stairs according to claim 2, characterized in that: The crawling track (24) has two tracks spaced apart from each other on the left and right. Correspondingly, the first support rod (21) is also provided with two first track wheels (210) spaced apart from each other on the left and right. The second support rod (22) is also provided with two second track wheels (220) spaced apart from each other on the left and right.

4. The trolley-type backpack for going up and down stairs according to claim 2, characterized in that: The back of the backpack body (10) is provided with a mounting seat (11) protruding outward, and the first support rod (21) is rotatably connected to the mounting seat (11). The elastic member (25) is a torsion spring sleeved on the first support rod (21), and the first end of the torsion spring abuts against the mounting seat (11), and the second end abuts against the back side wall of the backpack body (10).

5. The trolley-type backpack for going up and down stairs according to claim 2, characterized in that: A snap-on buckle (12) with a snap-on opening is also provided on the back side wall of the backpack body (10); when the track bracket (20) is in the first state, the second support rod (22) is snapped into the snap-on opening of the snap-on buckle (12).

6. The trolley-type backpack for going up and down stairs according to any one of claims 1 to 5, characterized in that: The angle between the track support (20) in the second state and the back side wall of the backpack body (10) is denoted as α, wherein the value range of α is: 30°≤α≤120°.

7. The trolley-type backpack for going up and down stairs according to any one of claims 2 to 5, characterized in that: It also includes a connecting rod assembly for limiting the opening angle of the track bracket (20) relative to the backpack body (10).

8. The trolley-type backpack for going up and down stairs according to claim 7, characterized in that: The connecting rod assembly comprises a first connecting rod (31) and a second connecting rod (32), wherein the first end of the first connecting rod (31) is rotatably connected to the back side wall of the backpack body (10), the second end of the first connecting rod (31) is rotatably connected to the first end of the second connecting rod (32), and the second end of the second connecting rod (32) is rotatably connected to the track bracket (20).

9. The trolley-type backpack for going up and down stairs according to claim 8, characterized in that: The crawler support (20) further comprises a third support rod (23) located between the first support rod (21) and the second support rod (22); a third crawler wheel (230) capable of freely rotating is provided on the third support rod (23); and the crawler track (24) is in rotational contact with the third crawler wheel (230).

10. The trolley-type backpack for going up and down stairs according to claim 9, characterized in that: The second end of the second connecting rod (32) is rotatably connected to the third supporting rod (23).

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