A trolley case with full automatic diagonal auxiliary support

Abstract

The utility model discloses a kind of pull rod box with full-automatic oblique auxiliary support, including box, telescopic pull rod assembly, pivot assembly and a pair of inclined strut;Inclined strut upper end is hinged to the back lower part of box by pivot assembly, lower end can contact ground. When box is inclined, inclined strut is automatically unfolded to form oblique support structure, and forms triangular force system with front wheel, and the arm load when dragging heavy object is greatly reduced;When box is vertical, inclined strut is housed in back recess, and is locked by the insertion of telescopic pull rod lower end and inclined strut positioning groove, realize the bidirectional push-pull function of box;Shaft assembly is guaranteed by spline circumferential force transmission, mechanical limit pin and pull rope triple protection, to ensure that the opening angle of inclined strut is stable;The embedded design of stepped shaft sleeve and limit shaft sleeve avoids pivot wear, prolongs service life.The utility model completely solves the defects that traditional two-wheel box is laborious when dragging, four-wheel box is prone to yaw when being pushed in one direction, and is especially suitable for multi-task scenarios such as holding children and handheld articles.

Description

Technical Field

[0001] This utility model relates to the field of travel luggage technology, specifically to a trolley case with fully automatic oblique auxiliary support. Background Technology

[0002] Rolling suitcases are a convenient storage tool widely used for business trips, travel, and purchasing goods. Traditional rolling suitcases typically consist of a suitcase body, a pull rod, and two wheels located at the front of the bottom of the suitcase. This structure has a significant drawback: when the contents of the suitcase are heavy, the user needs to tilt the suitcase and bear most of the weight with one arm, which can easily lead to arm pain and fatigue after prolonged use, resulting in a poor user experience.

[0003] Furthermore, traditional two-wheeled suitcases have limited functionality and are difficult to adapt to complex usage scenarios. For example, when users are traveling with children or need to handle other items at the same time (such as holding a child), they can only drag the suitcase with one hand, which is inconvenient and poses a safety hazard.

[0004] To address weight-bearing issues and improve flexibility, four-wheeled (swivel wheel) suitcases have emerged on the market. These suitcases can be pushed vertically, reducing arm strain to some extent. However, existing four-wheeled suitcases still have significant shortcomings in practical use: Limited operation: When vertical, the suitcase can only be pushed forward, not pulled. When adjusting direction or moving backward, the user must laboriously lift the entire suitcase to turn it or tilt and drag it again, resulting in insufficient flexibility. Poor directional stability: During pushing, due to the suitcase's high center of gravity and lack of effective restraint, the suitcase is prone to accidental deflection or "drifting," requiring frequent directional adjustments from the user. This makes operation difficult, and maintaining a straight path is challenging, especially on uneven surfaces or at slightly higher speeds.

[0005] Therefore, there is an urgent need for a new type of suitcase structure that can effectively reduce the burden on users, free their hands to adapt to various scenarios, and overcome the control defects of existing four-wheeled suitcases (i.e., achieve smooth pushing and pulling with stable direction). Utility Model Content

[0006] The purpose of this utility model is to provide a trolley case with fully automatic inclined auxiliary support, which aims to overcome the defects of the prior art and solve the problem of the operation defects of existing four-wheel trolley cases.

[0007] To address this, the present invention proposes a trolley case with fully automatic oblique auxiliary support, comprising a case body, a telescopic pull rod assembly, and a pivot assembly symmetrically arranged in the middle of the back of the case body; one or more oblique supports, the upper ends of which are hinged to the case body via the pivot assembly, and the lower ends of which are equipped with auxiliary wheels and can contact the ground; when the case body tilts towards the telescopic pull rod assembly, the oblique supports unfold due to gravity to form an oblique support structure; wherein, the pivot assembly includes a pivot shaft, a limiting bushing, and a stepped bushing; the pivot shaft passes through the oblique supports and is circumferentially limited therewith; the limiting bushing and the stepped bushing are respectively fixed to the two side walls of the groove of the case body, and the two ends of the pivot shaft are rotatably engaged with them.

[0008] As a preferred technical solution of this application, the rotating shaft is provided with a first limiting body, and the limiting shaft is sleeved with a second limiting body; the first limiting body and the second limiting body cooperate to limit the maximum unfolding angle θ of the diagonal brace.

[0009] As a preferred technical solution of this application, it also includes a pull rope, one end of which is connected to the diagonal brace and the other end of which is fixed to the box body, to help limit the maximum unfolding angle θ of the diagonal brace.

[0010] As a preferred technical solution of this application, a vertical groove II is provided on the lower part of the back of the box, and the inclined support is accommodated in the vertical groove II when the box is vertical.

[0011] As a preferred technical solution of this application, the lower end of the telescopic pull rod assembly protrudes from the rod sleeve, and the protrusion engages with the positioning groove at the top of the diagonal brace to achieve anti-sway locking in the diagonal brace's retracted state.

[0012] As a preferred technical solution of this application, the pull rod has a vertical baffle protruding from its lower end, the vertical baffle being used to clamp the diagonal brace in the vertical groove two when the diagonal brace is retracted into the vertical groove two and the pull rod is retracted.

[0013] As a preferred technical solution of this application, a reinforcing crossbar is also provided between the multiple diagonal braces; at the same time, the box body has a transverse clearance groove corresponding to the reinforcing crossbar.

[0014] As a preferred technical solution of this application, the diagonal brace is a tubular structure, and its top spline hole is interference-fitted with the external spline of the rotating shaft.

[0015] As a preferred technical solution of this application, the auxiliary wheel and the diagonal brace are eccentrically arranged, that is, the rotation center of the auxiliary wheel is offset by a certain distance L from the central axis of the diagonal brace away from the box body, so that the diagonal brace automatically unfolds 100% away from the box body after landing, thereby providing automatic support for the box body.

[0016] As a preferred technical solution of this application, the lower part of the rod where the diagonal brace is located is set as a bent rod, so that the diagonal brace has an angle bend of α = 3° to 5°, so that the diagonal brace automatically unfolds 100% away from the box after landing, thereby playing an automatic support role for the box.

[0017] Compared with the prior art, the trolley case with fully automatic inclined auxiliary support of this utility model has the following significant advantages:

[0018] 1. By using the rigid triangular support system formed by the extended diagonal brace and the front wheel of the suitcase, the weight of the suitcase, which is traditionally borne by the user's arm, is transformed into the vertical pressure of the diagonal brace on the ground and the rolling friction of the front wheel. The extended diagonal brace increases the ground contact area of ​​the suitcase, and together with the spline force transmission structure and double limit design, it effectively suppresses lateral sway during movement, significantly improving trajectory stability, especially on bumpy roads or at high speeds.

[0019] 2. Through an innovative oblique auxiliary support structure design, when the box is in an inclined dragging state, this support structure can provide additional support force pointing diagonally downward and backward. This support force works together with the wheels to significantly distribute the weight of the box and its contents from the user's arm, fundamentally solving the problem of excessive arm strain when dragging heavy objects in traditional two-wheeled boxes, and greatly improving dragging comfort and endurance.

[0020] 3. The diagonal brace of this utility model, when the pull rod is pulled out and the box body tilts downwards, will detach from the vertical groove two on the box body under its own weight. Due to the weight of the diagonal brace, it will automatically fall from the vertical groove two, and then the auxiliary wheel will abut against the ground to provide automatic support. The rod of the diagonal brace and the box body will automatically form a certain angle, and the auxiliary wheel of the diagonal brace and the rod of the diagonal brace will also form a certain angle, so that the box body will automatically tilt forward and assist in walking under the weight of the box body. In specific implementation, the rod body can also be set as a bent rod, so that the rod body bends at an angle of 3° to 5°, so that after the diagonal brace falls, the rod body of the diagonal brace and the auxiliary wheel form a support. When the user pulls the box body forward, the rod body of the diagonal brace will maintain a certain angle with the box body and will not move closer to the box body.

[0021] When the box is placed vertically, the diagonal brace automatically retracts into the vertical groove under its own weight; it is free to move when the lever is not pressed down; when the lever is pressed down to the lowest position, the lower end of the lever will lock the diagonal brace, and the diagonal brace will be locked; at this time, when the box is tilted or laid flat, the diagonal brace will not slip out because it is automatically locked by the lever, and will not affect the normal placement of the box.

[0022] 4. Another feature of this utility model is its labor-saving effect. When the lever is pulled out, the diagonal brace is unlocked and in a free-moving state. When the user walks, the box will tilt. At this time, the diagonal brace will automatically fall down and the auxiliary wheel will touch the ground. Part of the weight of the box will be borne by the diagonal brace, which will support the box itself. In this way, the pulling force of the box itself on the user's hand will be reduced, so that the bottom of the box will form a V-shaped support state, which can save effort and improve the support stability of the box.

[0023] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a schematic diagram of the unfolded three-dimensional structure of the trolley case with fully automatic inclined auxiliary support of this utility model (the inclined support 4 is in the open state);

[0026] Figure 2 This is a side view of the trolley case with fully automatic oblique auxiliary support according to the present invention (oblique brace 4 is in the retracted state);

[0027] Figure 3 This is a partial structural schematic diagram of the rotating shaft assembly of the trolley case with fully automatic oblique auxiliary support according to this utility model;

[0028] Figure 4 This is an exploded view of the rotating shaft assembly of the trolley case with fully automatic oblique auxiliary support according to this utility model;

[0029] Figure 5 This is a diagram showing the fit between the vertical baffle and the diagonal brace in the trolley case with fully automatic oblique auxiliary support of this utility model;

[0030] Figure 6 This is a schematic diagram of the outward bending of the diagonal brace in the trolley case with fully automatic diagonal auxiliary support according to this utility model;

[0031] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Telescopic pull rod assembly; 3. Rotary shaft assembly; 4. Diagonal brace; 5. Pull rope; 6. Reinforcing crossbar; 11. Vertical groove one; 12. Housing groove; 13. Vertical groove two; 14. Horizontal clearance groove; 21. Pull rod; 22. Rod sleeve; 31. Rotary shaft; 32. Limiting bushing; 33. Stepped bushing; 34. Locking screw; 121. Round hole; 211. Vertical baffle; 311. External spline; 312. Radial limiting pin; 321. Axial limiting pin; 322. Square flange plate; 41. Auxiliary wheel; 42. Spline hole; 43. Semi-circular end. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figures 1-6 As shown, the trolley case with fully automatic oblique auxiliary support of this utility model includes: case body 1, telescopic pull rod assembly 2, pivot assembly 3 and a pair of oblique supports 4; the telescopic pull rod assembly 2 is fixedly installed in the vertical groove 11 on the upper part of the back of the case body 1, the upper ends of the pair of oblique supports 4 are hinged to the case body 1 through the pivot assembly 3, the main body is movably embedded in the vertical groove 13 on the lower part of the back of the case body 1, and auxiliary wheels 41 can be installed at the lower end of the oblique supports 4.

[0034] In this invention, the case is not limited to the rigid, square-shaped suitcase commonly seen in daily life; it can also be a soft fabric case, such as a suitcase commonly used for grocery shopping or other shopping trips, or a heavier portable power bank case.

[0035] When the box 1 is tilted forward and dragged, the diagonal brace 4 simultaneously unfolds into an inclined state, with its bottom contacting the ground to form a diagonal support triangle, significantly distributing the load borne by the pull rod. At this time, the user only needs to apply a small traction force to move the heavy object, greatly reducing arm fatigue and increasing the stability of the box. The forward tilting of this invention refers to tilting towards the side where the diagonal brace 4 is located, that is, towards the side where the pull rod assembly 2 is located on the box.

[0036] Specifically, the telescopic pull rod assembly 2 includes a pull rod 21 and a sleeve 22 sleeved on the outside of the pull rod. The pull rod 21 and the sleeve 22 are slidably engaged and limited by a spring ball assembly. The sleeve 22 is fixedly engaged with a vertical groove 11 provided at the upper part of the back of the box 1, so that the entire box can be pulled by the telescopic pull rod assembly.

[0037] The upper end of the diagonal brace 4 is rotatably connected to the housing 1 via a rotating shaft assembly. When the housing is in a vertical position, the diagonal brace 4 is movably installed in the vertical groove 13 provided on the lower part of the back of the housing 1. The top of the diagonal brace 4 is rounded to form a semi-circular end 43 to prevent interference between the diagonal brace 4 and the housing during rotation.

[0038] The rotating shaft assembly 3 includes a rotating shaft 31, a limiting bushing 32, a stepped bushing 33, and a locking screw 34. The rotating shaft 31 sequentially passes through the left side wall of the housing groove 12, the limiting bushing 32, the diagonal brace 4, the stepped bushing 33, and the right side wall of the housing groove 12. The rotating shaft 31 is circumferentially limited with the top of the diagonal brace 4. The top of the diagonal brace 4 has a spline hole 42, and the rotating shaft 31 has an external spline 311. The spline hole 42 and the external spline 311 cooperate with each other to achieve circumferential limitation between the rotating shaft 31 and the diagonal brace 4. The rotating shaft assembly 3 is then axially fixed by threading the locking screw 34 to the rotating shaft 31. The circumferential limitation is achieved by the rotating shaft 31 passing through the top spline hole 42 of the diagonal brace 4. In specific implementations, rotational limitation between the rotating shaft 31 and the diagonal brace 4 can also be achieved by other limiting devices or welding.

[0039] The upper end of the diagonal brace 4 is rotatably connected to the housing 1 via a pivot assembly, thereby forming a hinged connection between the diagonal brace 4 and the housing 1. Through this hinged connection, when the pull rod is pulled out and the housing is tilted downward, the diagonal brace 4 will disengage from the vertical groove 2 on the housing under its own weight. At the same time, when the housing is placed vertically, the diagonal brace will automatically retract into the vertical groove 2 under its own weight.

[0040] The stepped bushing 33 is fixedly engaged with the round hole 121 on the right side wall of the recess 12 of the housing, and the limiting bushing 32 is fixedly engaged with the round hole on the left side wall of the recess 12 of the housing. This design avoids direct contact between the limiting bushing 32 and the recess 12 of the housing, thereby improving the wear resistance of the housing and extending its service life. This design not only improves the life of the pivot shaft, but also provides rigid support for the diagonal brace after it is deployed and placed on the ground.

[0041] Among them, the stepped bushing 33 has an annular step in the middle, which fits against the right side wall of the groove 12 of the housing and plays an axial limiting role; the limiting bushing 32 is similar to a flange, with a square flange plate 322 part and a bushing part.

[0042] Axially extending axial limiting pins 321 are provided on the side of the square flange plate 322, forming a second limiting body. Simultaneously, a radially extending radial limiting pin 312 is provided on the rotating shaft 31, forming a first limiting body. The radial limiting pin 312 is a detachable component, threadedly connected to the main structure of the rotating shaft 31. The first and second limiting bodies cooperate to limit the maximum rotation angle θ of the diagonal brace 4, limiting the diagonal brace rotation angle to ≤90°; preventing the diagonal brace 4 from rotating too much and failing to provide support. The maximum unfolding angle θ of the diagonal brace 4 is ≤90°. Figure 1 The angle θ is marked in the text.

[0043] When the diagonal brace 4 is at its maximum unfolding angle, the radial limiting pin 312 rotates to the point where it abuts against the axial limiting pin 321. The axial limiting pin 321 then holds the radial limiting pin 312 in place, thus limiting the radial limiting pin 312 to only move to the maximum unfolding angle θ.

[0044] The shapes of the first limiting body and the second limiting body are not limited to the cylindrical shape shown in the accompanying drawings. Other shapes can also be used. The purpose is that when the rotating shaft 31 rotates to the pre-designed maximum unfolding angle θ, the first limiting body and the second limiting body abut against each other, thereby limiting the rotation range of the rotating shaft 31.

[0045] In addition, a pull rope 5 is connected to the middle of the diagonal brace 4. The other end of the pull rope 5 is connected to the box body 1, which can also limit the maximum unfolding angle of the diagonal brace 4.

[0046] In practical implementation, the pull rope 5 can also be replaced with a rod-like structure consisting of multiple rods hinged together. When the diagonal brace 4 is extended, the rod-like structure also extends simultaneously, and when the diagonal brace 4 is retracted, the rod-like structure also extends accordingly, which can achieve a similar pulling effect to the pull rope, thereby reducing the interaction force between the axial limiting pin 321 and the radial limiting pin 312.

[0047] In practice, the pull rope 5 can also be replaced by a spring. The spring not only limits the maximum extension angle of the diagonal brace 4, but also pulls on the diagonal brace 4 at its maximum extension angle, thereby reducing the interaction force between the axial limiting pin 321 and the radial limiting pin 312.

[0048] In practical implementation, a reinforcing crossbar 6 is also provided between a pair of diagonal braces 4, and the box body 1 has a transverse clearance groove 14 corresponding to the reinforcing crossbar 6, which provides rigid support for the diagonal braces 4 after they are deployed and landed, improves the overall strength of the diagonal braces 4, and improves the stability of the box body during movement; at the same time, it also enables the two diagonal braces 4 to maintain the synchronicity of movement. When multiple diagonal braces 4 are set, the overall strength of the diagonal braces 4 can be improved by reinforcing the crossbar 6, further enhancing the load-bearing capacity of the box body.

[0049] The main body of the diagonal brace 4 is a lightweight hollow tube structure, which reduces gravity while ensuring structural strength, making the entire box lighter. The upper end of the hollow tube diagonal brace is not sealed, forming a positioning groove. At the same time, in the telescopic pull rod assembly 2, the lower end of the pull rod 21 protrudes from the bottom of the rod sleeve. The protruding part of the lower end of the pull rod 21 is inserted into the positioning groove to prevent the diagonal brace from swinging freely, so that the diagonal brace can be stably stopped in the vertical groove 13 set in the lower part of the back of the box 1. In specific implementation, the tubular structure of the diagonal brace 4 can be a hollow tube structure or a solid tube.

[0050] In another embodiment, such as Figure 5 As shown, the pull rod 21 has a locking structure protruding from its lower end. This locking structure is used to lock the diagonal brace 4 into the vertical groove 13 when the diagonal brace 4 is retracted into the vertical groove 13 and the pull rod 21 is retracted. The locking structure is a vertical baffle 211; at the same time, the dimension of the diagonal brace 4 in the thickness direction of the box is reduced, so that the vertical baffle 211 extends to a certain distance on the upper outer side of the diagonal brace 4, preventing the diagonal brace from swinging freely, and allowing the diagonal brace to be stably placed in the vertical groove 13 provided on the lower part of the back of the box 1.

[0051] like Figure 6 As shown, the lower end of the diagonal brace 4 bends outward, making the brace a bent rod with an angle of α = 3° to 5°. This allows the brace to bend with the auxiliary wheel after it falls, so that when the user pulls it forward towards the box, the brace maintains a certain angle with the box and does not move towards the box.

[0052] In this invention, the auxiliary wheel 41 is connected to the lower end of the diagonal brace 4; the position between the auxiliary wheel 41 and the diagonal brace 4 is set so that when the box is tilted and pulled forward, the diagonal brace 4 will not move towards the box behind it due to the forward movement of the box, so that the rod of the diagonal brace can maintain reliable and stable support for the box, and the diagonal brace will automatically unfold 100% away from the box after landing.

[0053] like Figure 6 As shown, the auxiliary wheel 41 is located on the side of the center line of the diagonal brace 4 away from the box body. The auxiliary wheel 41 and the diagonal brace 4 are eccentrically arranged, that is, the rotation center of the auxiliary wheel 41 is offset forward by a certain distance L relative to the central axis of the diagonal brace 4. This ensures that the diagonal brace 4 will not move towards the side closer to the box body when the box body is pulled. When the diagonal brace 4 is tilted, it has a forward oblique force and a tendency to move forward, rather than moving backward. This allows the diagonal brace to maintain reliable and stable support for the box body.

[0054] The working principle and process of the trolley case with fully automatic inclined auxiliary support of this utility model are briefly described below.

[0055] Towing mode (heavy load, effortless): When the user tilts the box 1 forward, the diagonal brace 4 automatically unfolds to the tilted state around the pivot assembly 3. The bottom of the diagonal brace 4 contacts the ground and forms a triangular support system with the front wheel of the box. By distributing the weight of the box through diagonal support force, it significantly reduces the traction force required for the pull rod 21.

[0056] Mode switching (push-pull conversion): Push mode: The box 1 returns to the vertical position, the diagonal brace 4 is fixed by the lower protrusion of the pull rod 21 and the positioning groove, and is completely stored in the vertical groove 13. The four wheels of the box are on the ground, and the user can push and pull it in both directions.

[0057] Towing mode switching: When the box tilts forward, the diagonal brace 4 automatically disengages from the positioning groove under gravity and unfolds to the position where the radial limit pin 312 and the axial limit pin 321 of the rotating shaft assembly 3 abut (≤90°), forming a stable support.

[0058] Anti-deviation protection: During movement, the diagonal brace 4 transmits lateral force through spline connection, and together with the flexible constraint of the pull rope 5 and the rigid constraint of the reinforcing crossbar 6, it suppresses the swaying of the box; when stored, the rigid locking of the pull rod 21 and the positioning groove prevents the diagonal brace from shaking.

[0059] This utility model relates to a trolley case with fully automatic inclined auxiliary support. Through a rigid triangular support system formed by the extended inclined brace and the front wheels, the weight of the case, traditionally borne by the user's arm, is transformed into vertical pressure from the inclined brace against the ground and rolling friction from the front wheels. Actual tests show that when the case is loaded with 20kg of items, the traction force required by the user's arm in dragging mode is reduced by more than 60%, completely solving the industry problem of fatigue caused by heavy-load dragging of traditional two-wheeled cases.

[0060] Based on the linkage locking mechanism of the pull rod and the diagonal brace: In the push mode, the protruding part at the lower end of the pull rod is inserted into the positioning groove of the diagonal brace, so that the diagonal brace is stably stored in the second groove, forming a flat box wall; in the drag mode, the box body automatically releases the lock when it tilts forward, and the diagonal brace unfolds to a limit angle of ≤90° under gravity (which is rigidly stopped by the limit pin).

[0061] Innovative design integrating mechanical torsional resistance, flexible constraint, and wear-resistant force transmission: The spline force transmission structure (rotating shaft 31 external spline 311 + diagonal brace spline hole 42) ensures rigid transmission of lateral force and suppresses housing sway; the double stop of flexible limit by pull rope and mechanical limit pin prevents support failure caused by over-extension of the diagonal brace; the embedded bushing design (limit bushing 32 / stepped bushing 33 isolates the rotating shaft from the housing) reduces friction loss and ensures that the rotation accuracy error of the rotating shaft is ≤0.5mm.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A trolley case with full automatic diagonal assisted support, comprising a case body (1), a telescopic trolley assembly (2), characterized in that: Also includes A rotating shaft assembly (3) is symmetrically arranged in the middle of the back of the housing (1); One or more diagonal braces (4) are hinged to the housing (1) at their upper ends via a pivot assembly (3) and have auxiliary wheels (41) installed at their lower ends and are in contact with the ground; when the housing (1) tilts toward the telescopic rod assembly (2), the diagonal braces (4) unfold to form a diagonal support structure; The rotating shaft assembly (3) includes a rotating shaft (31), a limiting bushing (32), and a stepped bushing (33); the rotating shaft (31) passes through the diagonal brace (4) and is circumferentially limited therewith; the limiting bushing (32) and the stepped bushing (33) are respectively fixed to the two side walls of the box groove (12), and the two ends of the rotating shaft (31) are rotatably engaged with it.

2. The trolley case with fully automatic inclined auxiliary support according to claim 1, characterized in that, The rotating shaft (31) is provided with a first limiting body, and the limiting bushing (32) is provided with a second limiting body; the first limiting body and the second limiting body work together to limit the maximum unfolding angle θ of the diagonal brace (4).

3. The trolley case with fully automatic inclined auxiliary support according to claim 2, characterized in that, It also includes a pull rope (5), one end of which is connected to the diagonal brace (4), and the other end of which is fixed to the box (1) to help limit the maximum unfolding angle θ of the diagonal brace.

4. The trolley case with fully automatic inclined auxiliary support according to claim 1, characterized in that, The lower part of the back of the box (1) is provided with a vertical groove two (13), and when the box is vertical, the diagonal brace (4) is housed in the vertical groove two (13).

5. The trolley case with fully automatic inclined auxiliary support according to claim 1, characterized in that, The lower end of the pull rod (21) of the telescopic pull rod assembly (2) protrudes from the rod sleeve (22), and the protrusion is engaged with the positioning groove at the top of the diagonal brace (4) to achieve anti-sway locking in the diagonal brace storage state.

6. The trolley case with fully automatic inclined auxiliary support according to claim 5, characterized in that, The pull rod (21) has a vertical baffle (211) protruding from its lower end. The vertical baffle (211) is used to lock the diagonal brace (4) in the vertical groove (13) when the diagonal brace (4) is retracted into the vertical groove (13) and the pull rod (21) is retracted, so as to realize the anti-sway locking of the diagonal brace in the storage state.

7. The trolley case with fully automatic inclined auxiliary support according to claim 1, characterized in that, A reinforcing crossbar (6) is provided between multiple diagonal braces (4); at the same time, the box body (1) has a transverse clearance groove (14) corresponding to the reinforcing crossbar (6).

8. The trolley case with fully automatic inclined auxiliary support according to claim 1, characterized in that, The diagonal brace (4) is a tubular structure, and its top spline hole (42) is interference-fitted with the outer spline (311) of the rotating shaft (31).

9. The trolley case with fully automatic inclined auxiliary support according to claim 1, characterized in that, The auxiliary wheel (41) is eccentrically arranged with respect to the diagonal brace (4), that is, the rotation center of the auxiliary wheel (41) is offset by a certain distance L relative to the central axis of the diagonal brace (4) away from the box body (1).

10. The trolley case with fully automatic inclined auxiliary support according to claim 1, characterized in that, The lower part of the rod containing the diagonal brace (4) is configured as a bent rod, so that the diagonal brace (4) has an angle bend of α = 3° to 5°.

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