Crawling ladder assembly and car roof storage assembly

Abstract

The utility model provides a ladder stand assembly. The ladder stand assembly comprises a first-stage ladder section, a second-stage ladder section and a third-stage ladder section, the top of the first-stage stair flight is used for being connected to a roof platform or a vehicle. The lower portion of the second-stage ladder section is rotationally connected to the lower portion of the first-stage ladder section so that the top of the second-stage ladder section can be folded to the position above the bottom of the first-stage ladder section, and the second-stage ladder section is located on the front side of the first-stage ladder section. The top of the third-stage ladder section is hinged to the top of the second-stage ladder section so that the bottom of the third-stage ladder section can be folded to the position below the top of the second-stage ladder section, and the third-stage ladder section is located on the front side of the second-stage ladder section. After the ladder stand assembly is unfolded, the first-stage ladder section, the second-stage ladder section and the third-stage ladder section are sequentially connected from top to bottom, and the end, hinged to the third-stage ladder section, of the second-stage ladder section is located on the front side of the first-stage ladder section. The ladder stand assembly solves the problems that the stability is poor after the ladder stand assembly is unfolded, and a vehicle body of a vehicle is prone to being abraded when the ladder stand assembly shakes, and user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle accessories, in particular to a ladder assembly and a vehicle roof storage assembly. Background Art

[0002] With the increasing number of people traveling by car, some vehicles are equipped with roof platforms for storing luggage or installing tents in order to improve the vehicle's carrying capacity and space utilization. In addition, to facilitate climbing to the roof, a folding ladder is usually fixed to one side of the roof platform.

[0003] However, most existing folding ladders are only fixedly connected to the vehicle or roof platform at the upper end after being unfolded, and the lower end is usually suspended in the air or directly attached to the vehicle body, which makes the folding ladder less stable after being unfolded. In addition, when the folding ladder shakes, it is easy to cause wear to the vehicle body, resulting in a poor user experience. Utility Model Content

[0004] In view of the above problems, the present invention is proposed to provide a ladder assembly and a roof storage assembly that overcome the above problems or at least partially solve the above problems. It can solve the problems that the folding ladder has poor stability after being unfolded, and is prone to wear on the vehicle body when the folding ladder shakes, resulting in poor user experience.

[0005] Specifically, the utility model provides a ladder assembly, comprising:

[0006] A first-level ladder section, the top of which is used to be connected to a roof platform or a vehicle.

[0007] A secondary stair section, the lower portion of which is rotatably connected to the lower portion of the primary stair section so that the top portion of the secondary stair section can be folded above the bottom portion of the primary stair section, and the secondary stair section is located in front of the primary stair section.

[0008] A three-stage stair section, the top of which is hinged to the top of the two-stage stair section so that the bottom of the three-stage stair section can be folded below the top of the two-stage stair section, and the three-stage stair section is located in front of the two-stage stair section.

[0009] After the ladder assembly is unfolded, the first-stage ladder section, the second-stage ladder section and the third-stage ladder section are sequentially connected from top to bottom, and one end of the second-stage ladder section hinged to the third-stage ladder section is located in front of the first-stage ladder section.

[0010] Optionally, the three-step ladder section includes:

[0011] The first sub-ladder has a top hinged to the top of the secondary ladder section and is stacked on the front side of the secondary ladder section. The bottom of the first sub-ladder is flush with or lower than the bottom of the secondary ladder section.

[0012] The second sub-ladder has its top hinged to the bottom of the first sub-ladder so that the second sub-ladder can be folded to the lower side of the secondary ladder section and is located between the first sub-ladder and the primary ladder section in the front-to-back direction.

[0013] Optionally, when the bottom of the first sub-ladder is lower than the bottom of the secondary ladder section, and the second sub-ladder is folded to the rear side of the first sub-ladder,

[0014] The bottom of the second sub-ladder is located above the bottom of the first sub-ladder. The second sub-ladder extends along the extension direction of the secondary ladder section and is spaced apart from the secondary ladder section in the extension direction.

[0015] Optionally, in the front-to-back direction, the width of the second sub-ladder is the same as the width of the secondary ladder section.

[0016] Optionally, a lock is provided between the first and second steps, and / or between the first and third steps, and / or between the second and third steps, to facilitate relative locking of the first and second steps, and / or between the first and third steps, and / or between the second and third steps after the ladder assembly is folded.

[0017] Optionally, when the lock is provided between the first-level stair section and the third-level stair section, the lock includes:

[0018] A locking groove is fixedly connected to the three-step ladder section, and the locking groove penetrates in a vertical direction.

[0019] A latch is fixedly connected to the first ladder section, and the latch can be moved in a vertical direction so that the latch can be movably inserted into the lock slot.

[0020] Optionally, a protective plate extending forward is connected to the left and right sides of the first-level stair section respectively, and the front ends of the two protective plates are flush with the front ends of the third-level stair section.

[0021] Optionally, the first-level stair section, the second-level stair section and the third-level stair section are all arranged vertically.

[0022] The ladder assembly also includes a vertically arranged extension section, the bottom of the secondary ladder section is hinged to one end of the extension section, and the other end of the extension section is rotatably connected to the lower part of the primary ladder section, so that the secondary ladder section is indirectly rotatably connected to the primary ladder section through the extension section.

[0023] The front bottom of the first-level stair section is fixedly connected to a first stop plate extending close to each other in the left and right directions, and the rotation axis of the extended section and the first-level stair section is located on the upper side of the first stop plate, so that the first stop plate limits the rotation of the extended section so that the extended section can rotate at an angle less than 180°.

[0024] A second stop plate is fixedly connected to the extended section, and the second stop plate stops the rotation path of the secondary ladder section so that after the ladder assembly is unfolded, the end of the secondary ladder section hinged to the third ladder section is located in front of the first ladder section.

[0025] Optionally, the ladder assembly further includes a plurality of gaskets, one end of each gasket being fixedly connected to the front side of the first-level ladder section, and the other end of each gasket being in contact with the second-level ladder section.

[0026] The utility model provides a vehicle roof storage assembly, comprising:

[0027] The platform assembly includes a frame for fixing or pulling connection to the top of the vehicle.

[0028] The ladder assembly is connected to the frame by pulling or flipping.

[0029] In the ladder assembly of the present invention, when the ladder assembly is in the unfolded state, the end of the third step away from the second step is in contact with the ground, and the top of the first step is connected to the vehicle, so that the ladder assembly, the vehicle and the ground form a triangular structure, which makes the structure of the ladder assembly more stable in the unfolded state, reduces the shaking of the ladder assembly when the user climbs, improves the safety of the ladder assembly, and at the same time reduces the occurrence of wear on the vehicle body due to the shaking of the ladder assembly, thereby improving the user experience.

[0030] After the ladder assembly is installed on the roof platform or on the vehicle, when the ladder assembly is in the unfolded state, the hinged end of the secondary ladder section and the tertiary ladder section is located in front of the primary ladder section, and the hinged end of the secondary ladder section and the tertiary ladder section is away from the vehicle body, thereby preventing the secondary ladder section of the ladder assembly from being too close to the vehicle body, and further preventing the secondary ladder section from shaking and contacting with the vehicle body or even scratching the vehicle body.

[0031] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0033] Figure 1 is a schematic front view of a ladder assembly in a folded state according to an embodiment of the present utility model;

[0034] Figure 2 yes Figure 1 Schematic cross-section at AA in the middle;

[0035] Figure 3 1 is a schematic front view of a ladder assembly in an expanded state according to an embodiment of the present invention;

[0036] Figure 4 is a schematic left side view of a ladder assembly in an unfolded state according to one embodiment of the present utility model;

[0037] Figure 5 It is a schematic structural diagram of a ladder assembly according to an embodiment of the utility model.

[0038] List of reference numerals: 100, first-level ladder section; 200, second-level ladder section; 300, third-level ladder section; 310, first sub-ladder; 320, second sub-ladder; 400, extension section; 500, protective plate; 510, first stop plate; 600, lock; 700, gasket. DETAILED DESCRIPTION

[0039] Refer to the following Figures 1 to 5 To describe the ladder assembly and the roof storage assembly of the embodiment of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

[0040] Unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," "fixed," and "coupled" should be interpreted broadly. For example, they may refer to fixed connections, removable connections, or integration. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary. They may refer to internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0041] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact via another feature between them. That is, in the description of this embodiment, the first feature being "above," "above," and "above" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below," "below," or "below" the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of the present embodiment, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0043] Figure 1 FIG. 1 is a schematic front view of a ladder assembly in a folded state according to an embodiment of the present invention. Figure 1 As shown, and reference Figures 2 to 5 The embodiment of the present invention provides a ladder assembly, which includes a first-stage ladder section 100 , a second-stage ladder section 200 , and a third-stage ladder section 300 .

[0044] The top of the first step 100 is used to be connected to a roof platform or a vehicle.

[0045] The lower portion of the secondary stair section 200 is rotatably connected to the lower portion of the primary stair section 100 so that the top portion of the secondary stair section 200 can be folded above the bottom portion of the primary stair section 100 and the secondary stair section 200 is located in front of the primary stair section 100 .

[0046] The top of the tertiary stair section 300 is hinged to the top of the secondary stair section 200 so that the bottom of the tertiary stair section 300 can be folded below the top of the secondary stair section 200 and the tertiary stair section 300 is located in front of the secondary stair section 200.

[0047] After the ladder assembly is unfolded, the first-level ladder section 100 , the second-level ladder section 200 and the third-level ladder section 300 are connected in sequence from top to bottom, and the hinged end of the second-level ladder section 200 and the third-level ladder section 300 is located in front of the first-level ladder section 100 .

[0048] In this embodiment, when the ladder assembly is to be used, the third-stage ladder section 300 at the front can be pulled out first, so that the third-stage ladder section 300 drives the second-stage ladder section 200 to move, and then the second-stage ladder section 200 drives the first-stage ladder section 100 to move, until the end of the third-stage ladder section 300 away from the second-stage ladder section 200 contacts the ground or other supporting platform, so that the ladder assembly is in an unfolded state for the user to climb. When the ladder assembly is in the unfolded state, the end of the third-stage ladder section 300 away from the second-stage ladder section 200 contacts the ground, and the top of the first-stage ladder section 100 is connected to the vehicle, so that the ladder assembly, the vehicle, and the ground form a triangular structure, thereby making the ladder assembly more stable in the unfolded state, reducing the shaking of the ladder assembly when the user climbs, improving the safety of the ladder assembly, and reducing the wear and tear on the vehicle body caused by the shaking of the ladder assembly, thereby improving the user experience.

[0049] After the ladder assembly is installed on the roof platform or the vehicle, since the hinged end of the secondary ladder section 200 and the tertiary ladder section 300 is in the front side of the primary ladder section 100 when the ladder assembly is in the unfolded state, the hinged end of the secondary ladder section 200 and the tertiary ladder section 300 is away from the vehicle body, thereby preventing the secondary ladder section 200 of the ladder assembly from being too close to the vehicle body, thereby preventing the secondary ladder section 200 from shaking and contacting with the vehicle body or even scratching the vehicle body, thereby improving the user experience.

[0050] In some embodiments of the present invention, Figure 2 and Figure 5 As shown, the three-step staircase 300 includes a first sub-ladder 310 and a second sub-ladder 320 .

[0051] The top of the first sub-ladder 310 is hinged to the top of the secondary stair section 200 and is stacked on the front side of the secondary stair section 200. The bottom of the first sub-ladder 310 is flush with or lower than the bottom of the secondary stair section 200.

[0052] The top of the second sub-ladder 320 is hinged to the bottom of the first sub-ladder 310 so that the second sub-ladder 320 can be folded to the lower side of the secondary ladder section 200 and located between the first sub-ladder 310 and the primary ladder section 100 in the front-to-back direction.

[0053] In this embodiment, the design of the second sub-ladder 320 allows for adjustment of the inclination angles of the secondary ladder section 200 and the first sub-ladder 310 by rotating the second sub-ladder 320, i.e., by changing the height of the top of the second sub-ladder 320 from the ground, when the secondary ladder section 200 and the first sub-ladder 310 are deployed. Furthermore, the adjustable height of the top of the second sub-ladder 320 from the ground allows the ladder assembly to be used on vehicles with varying roof heights, improving its adaptability.

[0054] In some embodiments of the present invention, the length of the second sub-ladder 320 is between 8 cm and 10 cm.

[0055] In some embodiments of the present invention, Figure 2 As shown, when the bottom of the first sub-ladder 310 is lower than the bottom of the secondary ladder section 200 and the second sub-ladder 320 is folded to the rear side of the first sub-ladder 310,

[0056] The bottom of the second sub-ladder 320 is located above the bottom of the first sub-ladder 310 . The second sub-ladder 320 extends along the extension direction of the secondary stair section 200 and is spaced apart from the secondary stair section 200 in the extension direction.

[0057] In this embodiment, the second sub-ladder 320 is folded between the first sub-ladder 310 and the first-level ladder section 100, and the second sub-ladder 320 is located on the lower side of the second-level ladder section 200 and extends along the extension direction of the second-level ladder section 200, thereby reducing the volume occupied by the ladder assembly after folding.

[0058] The second sub-ladder 320 is spaced apart from the secondary ladder section 200 in its extending direction to ensure that the second sub-ladder 320 and the secondary ladder section 200 do not interfere with each other when the second sub-ladder 320 is folded to the side of the first sub-ladder 310 and then folded toward the secondary ladder section 200 following the first sub-ladder 310.

[0059] In some embodiments of the present invention, Figure 2 As shown, in the front-to-back direction, the width of the second sub-ladder 320 is the same as the width of the secondary ladder section 200 .

[0060] In this embodiment, the second sub-ladder 320 and the secondary ladder section 200 are both folded between the first sub-ladder 310 and the first ladder section 100, and the second sub-ladder 320 is located on the lower side of the secondary ladder section 200. The second sub-ladder 320 and the secondary ladder section 200 have the same width, further reducing the volume occupied by the ladder assembly after folding.

[0061] In some embodiments of the present invention, a lock 600 is provided between the primary ladder section 100 and the secondary ladder section 200 to facilitate relative locking of the primary ladder section 100 and the secondary ladder section 200 after the ladder assembly is folded.

[0062] In some embodiments of the present invention, a lock 600 is provided between the secondary ladder section 200 and the tertiary ladder section 300 to facilitate relative locking of the secondary ladder section 200 and the tertiary ladder section 300 after the ladder assembly is folded.

[0063] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, a lock 600 is provided between the primary ladder section 100 and the tertiary ladder section 300 to facilitate relative locking of the primary ladder section 100 and the tertiary ladder section 300 after the ladder assembly is folded.

[0064] In this embodiment, since the secondary stair section 200 is located between the primary stair section 100 and the first sub-ladder 310 in the tertiary stair section 300, the primary stair section 100 and the box cover are locked together by the lock 600, and the secondary stair section 200 is also locked at the same time, preventing people other than the user from unfolding the ladder assembly, making the ladder assembly less likely to be damaged.

[0065] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, when the lock 600 is disposed between the first stair section 100 and the third stair section 300, the lock 600 includes a lock slot fixedly connected to the third stair section 300 and a latch fixedly connected to the first stair section 100. The lock slot extends vertically through the stair section. The latch is movable vertically so that the latch can be movably inserted into the lock slot.

[0066] In this embodiment, the structure of locking the first-stage ladder section 100 and the third-stage ladder section 300 by inserting a pin into a locking groove is simple, easy to design and manufacture, and reduces the production cost of the ladder assembly.

[0067] In some embodiments of the present invention, the lock 600 is a rotary latch lock.

[0068] In other embodiments of the present invention, the lock 600 is a combination lock.

[0069] In this embodiment, the use of a combination lock eliminates the need for the user to carry unlocking tools such as keys, thereby avoiding the situation where the ladder assembly cannot be used due to forgetting to carry the unlocking tool, thereby improving the user experience.

[0070] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, a protective plate 500 extending forward is connected to the left and right sides of the first-stage stair section 100 respectively, and the front ends of the two protective plates 500 are flush with the front ends of the third-stage stair section 300 .

[0071] In this embodiment, the secondary ladder section 200 and the tertiary ladder section 300 are both located between two protective plates 500, so that the protective plates 500 can protect the secondary ladder section 200 and the tertiary ladder section 300, which not only reduces the bumps and collisions of the secondary ladder section 200 and the tertiary ladder section 300, thereby increasing the service life of the ladder assembly, but also reduces the external dust from falling onto the hinges of the primary ladder section 100, the secondary ladder section 200 and the tertiary ladder section 300, thereby avoiding the difficulty of rotation caused by a large amount of dust at the hinges, and ensuring the smoothness of the unfolding or folding process of the ladder assembly.

[0072] In some embodiments of the present invention, Figure 1 、 Figure 4 and Figure 5 As shown, the first-level stair section 100 , the second-level stair section 200 and the third-level stair section 300 are all arranged vertically.

[0073] The ladder assembly also includes a vertically arranged extension section 400. The bottom of the secondary ladder section 200 is hinged to one end of the extension section 400, and the other end of the extension section 400 is rotatably connected to the lower part of the primary ladder section 100, so that the secondary ladder section 200 is indirectly rotatably connected to the primary ladder section 100 through the extension section 400.

[0074] A first stop plate 510 is fixedly connected to the front bottom of the first-level stair section 100 and extends close to each other in the left and right directions. The rotation axis of the extension section 400 and the first-level stair section 100 is on the upper side of the first stop plate 510, so that the first stop plate 510 limits the rotation of the extension section 400, so that the extension section 400 can rotate at an angle less than 180°.

[0075] A second stop plate is fixedly connected to the extension section 400, and the second stop plate stops on the rotation path of the secondary ladder section 200, so that after the ladder assembly is unfolded, the end of the secondary ladder section 200 hinged to the tertiary ladder section 300 is located in front of the primary ladder section 100.

[0076] In this embodiment, the rotation axis of the extension section 400 and the first-level stair section 100 is on the upper side of the first stop plate 510. The extension section 400 will be blocked by the first stop plate 510 during its forward rotation, so that the angle at which the extension section 400 can rotate forward is less than 180°. That is, after the extension section 400 rotates forward, the end of the extension section 400 connected to the second-level stair section 200 is in front of the end of the extension section 400 connected to the first-level stair section 100. Since the second stop plate is stopped on the rotation path of the second-level stair section 200, the second-level stair section 200 will be blocked by the second stop plate during its forward rotation, thereby causing the second-level stair section 200 to be in front of the first-level stair section 100.

[0077] In some embodiments of the present invention, the bottoms of the two protective plates 500 are fixedly connected to a horizontally arranged first stop plate 510 , and the rotation axis of the extension section 400 and the first step section 100 is located on the upper side of the first stop plate 510 .

[0078] In other embodiments of the present invention, the front ends of the two protective plates 500 are fixedly connected to a vertically arranged first stop plate 510 , and the rotation axis of the extension section 400 and the first step section 100 is located on the upper side of the first stop plate 510 .

[0079] In some embodiments of the present invention, the extending section 400 can rotate at an angle between 90° and 120°.

[0080] In some embodiments of the present invention, Figure 3 As shown, the ladder assembly further includes a plurality of gaskets 700 , one end of the gasket 700 is fixedly connected to the front side of the first-level ladder section 100 , and the other end abuts against the second-level ladder section 200 .

[0081] In this embodiment, the gasket 700 is located between the primary stair section 100 and the secondary stair section 200 to buffer vibrations when the secondary stair section 200 is stored in front of the primary stair section 100, thereby preventing the primary stair section 100 and the secondary stair section 200 from colliding.

[0082] The embodiment of the utility model provides a vehicle roof storage assembly, which includes a platform assembly and a ladder assembly in any of the above embodiments.

[0083] The platform assembly includes a frame that is fixed or retractably connected to the top of the vehicle.

[0084] The ladder assembly is connected to the frame by pulling or flipping.

[0085] In this embodiment, when the ladder assembly is in the unfolded state, the end of the third-level ladder section 300 away from the second-level ladder section 200 is in contact with the ground, and the top of the first-level ladder section 100 is connected to the vehicle, so that the ladder assembly, the vehicle and the ground form a triangular structure, thereby making the structure of the ladder assembly in the unfolded state more stable, reducing the shaking of the ladder assembly when the user climbs, improving the safety of the ladder assembly, and at the same time reducing the occurrence of wear on the vehicle body due to the shaking of the ladder assembly, thereby improving the user experience.

[0086] After the ladder assembly is installed on the roof platform or the vehicle, since the hinged end of the secondary ladder section 200 and the tertiary ladder section 300 is in the front side of the primary ladder section 100 when the ladder assembly is in the unfolded state, the hinged end of the secondary ladder section 200 and the tertiary ladder section 300 is away from the vehicle body, thereby preventing the secondary ladder section 200 of the ladder assembly from being too close to the vehicle body, thereby preventing the secondary ladder section 200 from shaking and contacting with the vehicle body or even scratching the vehicle body, thereby improving the user experience.

[0087] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention can be directly determined or deduced from the contents disclosed herein without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A ladder assembly, comprising: a first-level stair section, wherein the top of the first-level stair section is used to be connected to a roof platform or a vehicle; a secondary stair section, wherein the lower portion of the secondary stair section is rotatably connected to the lower portion of the primary stair section so that the top portion of the secondary stair section can be folded above the bottom portion of the primary stair section, and the secondary stair section is located in front of the primary stair section; a third-stage stair section, wherein the top of the third-stage stair section is hinged to the top of the second-stage stair section so that the bottom of the third-stage stair section can be folded below the top of the second-stage stair section, and the third-stage stair section is located in front of the second-stage stair section; as well as After the ladder assembly is unfolded, the first-stage ladder section, the second-stage ladder section and the third-stage ladder section are sequentially connected from top to bottom, and one end of the second-stage ladder section hinged to the third-stage ladder section is located in front of the first-stage ladder section.

2. The ladder assembly according to claim 1, characterized in that: The three-step ladder section includes: a first sub-ladder, wherein the top of the first sub-ladder is hinged to the top of the secondary ladder section and is stacked on the front side of the secondary ladder section; and the bottom of the first sub-ladder is flush with or lower than the bottom of the secondary ladder section; The second sub-ladder has its top hinged to the bottom of the first sub-ladder so that the second sub-ladder can be folded to the lower side of the secondary ladder section and is located between the first sub-ladder and the primary ladder section in the front-to-back direction.

3. The ladder assembly according to claim 2, characterized in that: When the bottom of the first sub-ladder is lower than the bottom of the secondary ladder section, and the second sub-ladder is folded to the rear side of the first sub-ladder, The bottom of the second sub-ladder is located above the bottom of the first sub-ladder. The second sub-ladder extends along the extension direction of the secondary ladder section and is spaced apart from the secondary ladder section in the extension direction.

4. The ladder assembly according to claim 3, characterized in that: In the front-to-back direction, the width of the second sub-ladder is the same as the width of the secondary ladder section.

5. The ladder assembly according to claim 1, characterized in that: A lock is provided between the first-level ladder section and the second-level ladder section, and / or between the first-level ladder section and the third-level ladder section, and / or between the second-level ladder section and the third-level ladder section, so as to cause the first-level ladder section and the second-level ladder section, and / or the first-level ladder section and the third-level ladder section, and / or the second-level ladder section and the third-level ladder section to be locked relative to each other after the ladder assembly is folded.

6. The ladder assembly according to claim 5, characterized in that: In the case where the lock is provided between the first-level staircase and the third-level staircase, the lock comprises: A locking groove fixedly connected to the three-step ladder section, the locking groove penetrating in the vertical direction; A latch is fixedly connected to the first ladder section, and the latch can be moved in a vertical direction so that the latch can be movably inserted into the lock slot.

7. The ladder assembly according to claim 1, characterized in that: The left and right sides of the first-stage stair section are respectively connected with a protective plate extending forward, and the front ends of the two protective plates are flush with the front ends of the third-stage stair section.

8. The ladder assembly according to claim 1, characterized in that: The first-level stair section, the second-level stair section and the third-level stair section are all arranged vertically; The ladder assembly further includes a vertically arranged extension section, the bottom of the secondary ladder section is hinged to one end of the extension section, and the other end of the extension section is rotatably connected to the lower part of the primary ladder section, so that the secondary ladder section is indirectly rotatably connected to the primary ladder section through the extension section; A first stopper is fixedly connected to the bottom of the front side of the first step and extends close to each other in the left and right directions. The rotation axis of the extension section and the first step is located on the upper side of the first stopper, so that the first stopper limits the rotation of the extension section, so that the extension section can rotate less than 180 degrees. A second stop plate is fixedly connected to the extended section, and the second stop plate stops the rotation path of the secondary ladder section so that after the ladder assembly is unfolded, the end of the secondary ladder section hinged to the third ladder section is located in front of the first ladder section.

9. The ladder assembly according to claim 1, characterized in that: The ladder assembly further includes a plurality of gaskets, one end of each gasket being fixedly connected to the front side of the first-stage ladder section, and the other end of each gasket being in contact with the second-stage ladder section.

10. A rooftop storage assembly, characterized in that: include: A platform assembly comprising a frame for fixing or retractably connecting to the top of the vehicle; The ladder assembly according to any one of claims 1 to 9, wherein the ladder assembly is connected to the frame by pulling or flipping.

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