Ladder structure and vehicle

Abstract

A ladder structure and a vehicle. The ladder structure comprises a first ladder, a second ladder and a locking device, wherein the first ladder is connected to the second ladder, the first ladder is configured to be fixed to a vehicle body of a vehicle, and the second ladder is adapted to move relative to the first ladder under the action of an external force so as to be in a deployed state or a stored state; and the locking device is arranged on the first ladder, and is adapted to lock the second ladder in the stored state.

Description

Ladder structure and vehicle

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 30, 2023, with application number 202311637431.4 and application name “Ladder Structure and Vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the field of vehicle technology, and in particular to a ladder structure and a vehicle. Background Art

[0003] Ladders can be used in various aspects of a vehicle, for example, as roof racks. Since a vehicle's roof is high above the ground, a ladder is often required to access it. However, current ladders are limited in length and are too high from the ground for the bottom end to reach the footrest, making it inconvenient to get on and off.

[0004] Summary of the Invention

[0005] The present disclosure provides a ladder structure and a vehicle, which solve the problem of inconvenience in getting on and off the roof of a vehicle due to the limited length of the ladder.

[0006] A ladder structure includes a first ladder, a second ladder, and a locking device, wherein the first ladder and the second ladder are connected, the first ladder is used to be fixed to the body of a vehicle, and the second ladder is suitable for moving relative to the first ladder under the action of an external force to be in an expanded state or a stowed state; the locking device is provided on the first ladder, and is suitable for locking the second ladder in the stowed state.

[0007] In one embodiment, the first ladder is rotatably connected to the second ladder.

[0008] In one embodiment, the ladder structure further includes a first connecting assembly, which is connected to both the first ladder and the second ladder and provides a first damping force when the second ladder rotates relative to the first ladder to be in an unfolded state.

[0009] In one embodiment, the first connecting assembly provides a second damping force when the second ladder rotates relative to the first ladder to be in the retracted state, and the first damping force is greater than the second damping force.

[0010] In one embodiment, the first connecting assembly includes a ratchet, an elastic member, and a mating member, the ratchet is fixed to one of the first ladder and the second ladder, the other of the first ladder and the second ladder is formed with a mounting hole, one end of the elastic member is fixed in the mounting hole, the other end of the elastic member is fixedly connected to the mating member, and the mating member cooperates with the ratchet.

[0011] In one embodiment, a plurality of bevel teeth are provided on the side of the ratchet facing the mounting hole, and the plurality of bevel teeth are arranged circumferentially in sequence around the rotation center of the ratchet; each of the bevel teeth has a bevel and a stop surface, the bevel faces the mounting hole, and the bevel includes a first edge and a second edge opposite to each other in the circumferential direction of the ratchet; along the axial direction of the ratchet, the distance between the first edge and the surface of the ratchet facing away from the bevel is smaller than the distance between the second edge and the surface of the ratchet facing away from the bevel; the bevel is inclined from one edge to the second edge, and the stop surface is connected to the first edge of one bevel and the second edge of an adjacent bevel, and the stop surface intersects with the bevel.

[0012] In one embodiment, the first ladder has a first limiting surface, and the second ladder has a second limiting surface. The first limiting surface and the second limiting surface cooperate to limit the rotation angle of the second ladder relative to the first ladder.

[0013] In one embodiment, the ladder structure further includes a third ladder connected to the second ladder, and the third ladder is adapted to slide relative to the second ladder so that the third ladder is in a deployed state or a semi-deployed state.

[0014] In one embodiment, when the second ladder moves relative to the first ladder and is in the unfolded state, the third ladder can slide relative to the second ladder.

[0015] In one embodiment, one of the second ladder and the third ladder is provided with a receiving cavity, and the receiving cavity is used to accommodate the other of the second ladder and the third ladder.

[0016] In one embodiment, the third ladder is provided with the receiving cavity, and the receiving cavity is used to accommodate the second ladder. When the third ladder slides relative to the second ladder and is in the deployed state, the second ladder extends out of the receiving cavity. When the third ladder slides relative to the second ladder and is in the semi-deployed state, the second ladder is accommodated in the receiving cavity.

[0017] In one embodiment, the ladder structure further includes a limiting member connected to both the second ladder and the third ladder, and the limiting member is used to limit the sliding length of the third ladder relative to the second ladder.

[0018] In one embodiment, the limiting member is arranged in the receiving cavity; the limiting member is formed with a waist-shaped through hole extending along the length direction of the limiting member; the ladder structure also includes a fixing member, the fixing member passes through the waist-shaped through hole, and the opposite ends of the fixing member are respectively fixed to the two opposite side walls of the receiving cavity.

[0019] In one embodiment, two opposite side walls of the receiving cavity are formed with sliding grooves, and two opposite sides of the limiting member are formed with protrusions corresponding to the sliding grooves, and the third ladder moves under the action of the protrusions and the sliding grooves.

[0020] In one embodiment, the limiting member and the second ladder are rotatably connected.

[0021] In one embodiment, when the third ladder slides relative to the second ladder to be in the deployed state, the second ladder is fully extended from the receiving cavity, and the third ladder is bent relative to the second ladder.

[0022] In one embodiment, the limiting member is formed with an arc-shaped through hole, and the ladder structure also includes a positioning member, which is fixedly connected to the second ladder, and the positioning member partially extends into the arc-shaped through hole. The positioning member cooperates with the arc-shaped through hole and is used to limit the rotation angle of the second ladder relative to the limiting member.

[0023] In one embodiment, the second ladder has a third limiting surface, and the limiting member has a fourth limiting surface. The third limiting surface and the fourth limiting surface cooperate with each other and are used to limit the rotation angle of the second ladder relative to the limiting member.

[0024] In one embodiment, the fourth limiting surface and the arc-shaped through hole are located at opposite ends of the limiting member in the thickness direction.

[0025] In one embodiment, the ladder structure further includes a plurality of buffer members, and the plurality of buffer members are fixedly connected to a side of the first ladder facing the vehicle body.

[0026] A vehicle comprises a vehicle body and the ladder structure according to any one embodiment of the present disclosure, wherein the first ladder is fixed to the vehicle body.

[0027] By providing a first ladder and a second ladder, and the second ladder being able to move relative to the first ladder to be in an extended state under the action of an external force, the overall length of the ladder structure is longer, the distance between the ladder structure and the ground is shortened, and climbing is convenient. In addition, the second ladder can be moved relative to the first ladder to be in a retracted state, and the second ladder is maintained in the retracted state by a locking device, making the overall ladder structure compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments.

[0029] FIG1 is a schematic diagram of a three-dimensional structure of a vehicle provided in an embodiment of the present disclosure;

[0030] FIG2 is a schematic diagram of a three-dimensional structure of a ladder structure in a state provided by an embodiment of the present disclosure;

[0031] FIG3 is a schematic diagram of the three-dimensional structure of a ladder structure in another state provided by an embodiment of the present disclosure;

[0032] FIG4 is a schematic diagram of the three-dimensional structure of a first ladder in a ladder structure provided by an embodiment of the present disclosure from a perspective;

[0033] FIG5 is a schematic diagram of the three-dimensional structure of a first ladder in a ladder structure provided by an embodiment of the present disclosure from another perspective;

[0034] FIG6 is a schematic diagram of the three-dimensional structure of the ladder structure in another state provided by an embodiment of the present disclosure;

[0035] FIG7 is a schematic diagram of a three-dimensional exploded structure of a ladder structure provided by an embodiment of the present disclosure from one perspective;

[0036] FIG8 is a schematic diagram of a partially exploded perspective structure of a ladder structure shown in FIG7 ;

[0037] FIG9 is a schematic diagram of a three-dimensional exploded structure of a ladder structure provided by an embodiment of the present disclosure from another perspective;

[0038] FIG10 is a schematic diagram of a three-dimensional exploded structure of a first connecting assembly in a ladder structure provided in an embodiment of the present disclosure;

[0039] FIG11 is a partial cross-sectional structural diagram of a ladder structure provided in an embodiment of the present disclosure;

[0040] FIG12 is a schematic diagram of a three-dimensional exploded structure of a ladder structure in another state provided by an embodiment of the present disclosure;

[0041] FIG13 is a schematic diagram of the three-dimensional structure of a second ladder and a third ladder in a ladder structure provided in an embodiment of the present disclosure;

[0042] FIG14 is another schematic perspective view of a vehicle according to an embodiment of the present disclosure;

[0043] FIG15 is a schematic diagram of the three-dimensional structure of a locking device in one state of a ladder structure provided by an embodiment of the present disclosure;

[0044] FIG16 is a schematic perspective view of a locking device in another state in a ladder structure provided by an embodiment of the present disclosure;

[0045] FIG17 is another perspective structural diagram of a second ladder and a third ladder in a ladder structure provided in an embodiment of the present disclosure;

[0046] FIG18 is a schematic cross-sectional view of the second ladder and the third ladder shown in FIG17 along line XVIII-XVIII;

[0047] FIG19 is a schematic diagram of the three-dimensional structure of a second ladder in a ladder structure provided in an embodiment of the present disclosure;

[0048] FIG20 is another schematic perspective view of a vehicle according to an embodiment of the present disclosure;

[0049] FIG21 is another schematic perspective structural diagram of a vehicle provided in an embodiment of the present disclosure;

[0050] FIG22 is a schematic cross-sectional view of a second ladder and a limiting member in a ladder structure provided in an embodiment of the present disclosure;

[0051] FIG23 is another schematic cross-sectional view of a second ladder and a limiting member in a ladder structure provided in an embodiment of the present disclosure.

[0052] Reference numerals:

[0053] A-first direction, B-second direction, C-third direction, D-fourth direction, 10-first ladder, 11-receiving groove, 12-first fixing part, 121-first side wall, 122-second side wall, 123-bottom wall, 1231-first limiting surface, 20a-second ladder, 20b-third ladder, 21-first rotating part, 211-mounting hole, 212-second limiting surface, 221-receiving cavity, 222-slide groove, 23-limiting member, 231-convex part, 232-waist-shaped through hole, 233-second rotating part, 2331-arc-shaped through hole, 2332-fourth limiting surface, 24-second fixing part, 241-third side wall, 242-fourth side wall, 243-first Three limiting surfaces, 30-first connecting component, 31-ratchet, 311-center hole, 312-oblique teeth, 3121-inclined surface, 3122-stop surface, 3123-first edge, 3124-second edge, 32-elastic member, 33-matching member, 331-matching part, 3311-arc surface, 34-first rotating shaft, 40-cover plate, 41-positioning hole, 50-pedal, 60-locking device, 61-lock hook, 62-lock buckle, 63-control switch, 70-magnetic member, 80-buffer member, 90-second connecting component, 91-fixing member, 92-second rotating shaft, 93-positioning member, 100-ladder structure, 200-body, 300-longitudinal beam, 1000-vehicle. DETAILED DESCRIPTION

[0054] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0055] The following descriptions of the various embodiments are provided with reference to the accompanying drawings to illustrate specific embodiments in which the present disclosure may be implemented. Directional terms herein, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," and "side," are used solely with reference to the directions in the accompanying drawings. Therefore, the use of directional terms is intended to better and more clearly illustrate and understand the present disclosure, and is not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present disclosure.

[0056] Furthermore, component numbers herein, such as "first," "second," and the like, are used solely to distinguish the components being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" in this disclosure, unless otherwise specified, include both direct and indirect connections (couplings).

[0057] Referring to Figures 1, 2, and 3, the present disclosure provides a ladder structure 100, which is applied to a vehicle 1000. The ladder structure 100 includes a first ladder 10, a second ladder 20a, and a locking device 60. The first ladder 10 and the second ladder 20a are connected. The first ladder 10 is used to be fixed to the vehicle body 200 of the vehicle 1000. The second ladder 20a is adapted to move relative to the first ladder 10 under the action of an external force to be in an expanded state or a stowed state. The locking device 60 is provided on the first ladder 10 and is adapted to lock the second ladder 20a in the stowed state.

[0058] By providing a first ladder 10 and a second ladder 20a, and the second ladder 20a being able to move relative to the first ladder 10 to be in an expanded state under the action of an external force, the overall length of the ladder structure 100 is longer, the distance between the ladder structure 100 and the ground is shortened, and climbing is facilitated. In addition, the second ladder 20a can move relative to the first ladder 10 to be in a retracted state, and the second ladder 20a is maintained in the retracted state by the locking device 60, making the ladder structure 100 compact as a whole.

[0059] For example, the first ladder 10 and the second ladder 20a are rotatably connected, the second ladder 20a rotates in a first direction A relative to the first ladder 10 to be in an unfolded state, the second ladder 20a rotates in a second direction B relative to the first ladder 10 to be in a stowed state, and the second ladder 20a is folded relative to the first ladder 10, and the first direction A and the second direction B are opposite.

[0060] When the second ladder 20a rotates relative to the first ladder 10 in the second direction B, the second ladder 20a is folded relative to the first ladder 10 until the second ladder 20a overlaps with the first ladder 10, and the first ladder 10 is in a stored state; when the second ladder 20a rotates relative to the first ladder 10 in the first direction A until the second ladder 20a can no longer rotate, the second ladder 20a is unfolded relative to the first ladder 10, as shown in Figures 3 and 6. Specifically, the second ladder 20a is arranged at an angle to the first ladder 10.

[0061] Referring to Figures 4 and 5 , for example, one side of the first ladder 10 is fixedly connected to the top of the vehicle body 200 (e.g., the longitudinal beam 300 of the luggage rack on top of the vehicle body 200). The ladder structure 100 also includes a cover plate 40, which is disposed on the top of the first ladder 10. The cover plate 40 has a positioning hole 41 defined therein. The longitudinal beam 300 of the luggage rack has a mating hole that mates with the positioning hole 41. Bolts are inserted through the positioning hole 41 and the mating hole to secure the top of the first ladder 10 to the longitudinal beam 300 of the luggage rack.

[0062] A magnetic member 70 (such as a magnetic suction cup) is provided at the bottom of the first ladder 10. The magnetic member 70 is used to adsorb the bottom of the first ladder 10 onto the side of the metal body 200, replacing the traditional structure of fixing the bottom of the first ladder 10 with bolts. There is no need to drill holes in the body 200, and the appearance of the body 200 will not be damaged.

[0063] For example, the ladder structure 100 also includes a plurality of buffer members 80 (such as rubber pads), which are fixedly connected to a side of the first ladder 10 facing the body 200 of the vehicle 1000. The buffer members 80 are supported on the window glass on the body 200, and can disperse the pressure generated by the ladder structure 100 on the body 200 when stepping on the ladder structure 100, thereby avoiding damage to the structure of the body 200.

[0064] 6 and 7 , the ladder structure 100 further includes a first connecting assembly 30 , which is disposed on the first ladder 10 and the second ladder 20 a . The first connecting assembly 30 is connected to both the first ladder 10 and the second ladder 20 a and provides a first damping force when the second ladder 20 a rotates in a first direction A relative to the first ladder 10 to be in an unfolded state.

[0065] By providing a first connecting assembly 30 between the first ladder 10 and the second ladder 20a, and by providing a first damping force to the second ladder 20a when the second ladder 20a is unfolded relative to the first ladder 10, the second ladder 20a can be unfolded slowly, thereby reducing the degree of damage to the ladder structure 100 and / or the vehicle body 200 when the second ladder 20a is unfolded, ensuring the service life of the ladder structure 100 and / or the vehicle body 200, and effectively preventing the second ladder 20a from causing damage to the user when it is unfolded relative to the first ladder 10.

[0066] When the second ladder 20a rotates in the second direction B relative to the first ladder 10 to be in the retracted state, a second damping force is provided, and the first damping force is greater than the second damping force.

[0067] When the second ladder 20a is folded relative to the first ladder 10, the first connecting assembly 30 provides a second damping force to the second ladder 20a, and the first damping force is greater than the second damping force. Therefore, when the second ladder 20a is unfolded relative to the first ladder 10, it has a greater damping force limit than when it is folded. The second ladder 20a will not fall directly and quickly to damage the ladder structure 100 and / or the body 200 of the vehicle 1000, thereby ensuring the service life of the ladder structure 100 and / or the body 200 and effectively preventing the second ladder 20a from causing injury to the user when it is unfolded relative to the first ladder 10.

[0068] Please refer to Figures 8, 9, and 10. For example, the first connecting assembly 30 includes a ratchet 31, an elastic member 32, and a mating member 33. The ratchet 31 is fixed to one of the first ladder 10 and the second ladder 20a. The ratchet 31 is located between the first ladder 10 and the second ladder 20a. The other of the first ladder 10 and the second ladder 20a is formed with a mounting hole 211. One end of the elastic member 32 is fixed in the mounting hole 211, and the other end of the elastic member 32 is fixedly connected to the mating member 33. The elastic member 32 is always in a compressed state, and the mating member 33 is mated with the ratchet 31.

[0069] For example, the ratchet 31 is fixed to the end of the first ladder 10, and a mounting hole 211 is formed at the end of the second ladder 20a. The mounting hole 211 is a blind hole. One end of an elastic member 32 is fixed to the side wall of the mounting hole 211, and the other end of the elastic member 32 is fixed to a mating member 33. The mating member 33 always abuts against the side surface of the ratchet 31 facing the second ladder 20a. The elastic member 32 is always in an elastically compressed state, and the elastic member 32 always applies a thrust to the mating member 33. When the second ladder 20a rotates relative to the first ladder 10 in the first direction A, the mating member 33 and the elastic member 32 rotate with the second ladder 20a. During the rotation, the mating member 33 exerts pressure on the elastic member 32 due to the action of the ratchet 31, causing the elastic member 32 to be further compressed. This increases the damping force when the second ladder 20a rotates in the first direction A, causing the second ladder 20a to slowly unfold under the action of its own weight and the first damping force.

[0070] For example, a plurality of bevel teeth 312 are provided on the side of the ratchet 31 facing the second ladder 20a. The plurality of bevel teeth 312 are arranged circumferentially around the rotation center of the ratchet 31. Each bevel tooth 312 has a bevel surface 3121 and a stop surface 3122. The bevel surface 3121 faces the mounting hole 211. The bevel surface 3121 includes a first edge 3123 and a second edge 3124 that are opposite to each other in the circumferential direction of the ratchet 31. In the axial direction of the ratchet 31, the first edge 312 3 to the surface of the ratchet 31 on the side away from the inclined surface 3121 is smaller than the distance between the second edge 3124 and the surface of the ratchet 31 on the side away from the inclined surface 3121; the inclined surface 3121 is inclined from the first edge 3123 to the second edge 3124, and the stop surface 3122 is connected to the first edge 3123 of one inclined surface 3121 and the second edge 3124 of the adjacent inclined surface 3121, and the stop surface 3122 intersects with the inclined surface 3121.

[0071] Specifically, the stop surface 3122 is connected to a first edge 3123 of an inclined surface 3121 and a second edge 3124 of an adjacent inclined surface 3121 close to the first edge 3123 . The stop surface 3122 may be parallel to the axial direction of the ratchet 31 .

[0072] Among them, the ratchet 31 is a circular ring structure, and the ratchet 31 is formed with a center hole 311. The axis of the center hole 311 is collinear with the axis of the mounting hole 211. In the axial direction of the center hole 311, the bevel teeth 312, the fitting 33, the elastic part 32, and the end of the second ladder 20a are arranged in sequence, and the fitting 33 abuts against the inclined surface 3121.

[0073] The inclined surface 3121 is tilted in the circumferential direction, and the stop surface 3122 is connected to the end of the inclined surface 3121 in the circumferential direction.

[0074] The second edges 3124 of the plurality of inclined surfaces 3121 are located at the same height in the axial direction of the central hole 311 , and the first edges 3123 of the plurality of inclined surfaces 3121 are located at the same height in the axial direction of the central hole 311 .

[0075] When the second ladder 20a rotates in the first direction A relative to the first ladder 10, the matching member 33 slides from one inclined surface 3121 along the stop surface 3122 to the first edge 3123 on the other inclined surface 3121 connected to the stop surface 3122. During this process, the elastic member 32 provides a first damping force on the second ladder 20a.

[0076] When the second ladder 20a rotates relative to the first ladder 10 in the second direction B, the engaging member 33 slides directly from the first edge 3123 of one inclined surface 3121 to the adjacent inclined surface 3121 in the second direction B. During this process, the engaging member 33 is not restricted by the stop surface 3122. Therefore, the elastic member 32 provides a second damping force on the second ladder 20a. The second damping force is smaller than the first damping force, making it easier to fold the second ladder 20a.

[0077] For example, a mating portion 331 is provided at the end of the mating piece 33 facing the ratchet 31 . The mating portion 331 is opposite to the oblique teeth 312 . The mating portion 331 has an arcuate surface 3311 , which is the circumference of the mating portion 331 .

[0078] The mating portion 331 is a hemispherical structure. The mating portion 331 is provided at the end of the mating piece 33 . In the axial direction of the central hole 311 , the mating portion 331 is opposite to the helical teeth 312 and abuts against the inclined surface 3121 .

[0079] When the second ladder 20a rotates relative to the first ladder 10 in the first direction A, the engaging portion 331, under the action of the elastic member 32 and the arcuate surface 3311, rotates from the inclined surface 3121 of one bevel tooth 312, through the stop surface 3122 of the adjacent bevel tooth 312, to the inclined surface 3121 of the adjacent bevel tooth 312. The engaging portion 33 and the elastic member 32 provide a first damping force on the second ladder 20a. When the second ladder 20a rotates relative to the first ladder 10 in the second direction B, the engaging portion 331, under the action of the elastic member 32 and the arcuate surface 3311, rotates from the inclined surface 3121 of one bevel tooth 312 to the inclined surface 3121 of the adjacent bevel tooth 312. The engaging portion 33 and the elastic member 32 provide a second damping force on the second ladder 20a.

[0080] By providing the arc surface 3311 , when the second ladder 20 a rotates relative to the first ladder 10 in the first direction A, the arc surface 3311 of the matching portion 331 can more easily slide along the stop surface 3122 to the highest point of an adjacent inclined surface 3121 under the action of the elastic member 32 and the inclined surface 3121 .

[0081] The first ladder 10 includes a first fixed portion 12, which is located at the end of the first ladder 10 and includes a first side wall 121 and a second side wall 122 opposite to each other. The ratchet 31 is fixed to the first side wall 121. The second ladder 20a includes a first rotating portion 21, which is located at the end of the second ladder 20a and is located between the first side wall 121 and the second side wall 122. The first connecting assembly 30 also includes a first rotating shaft 34, which passes through the first side wall 121, the first rotating portion 21, the ratchet 31, and the second side wall 122 in sequence. The first rotating portion 21 rotates around the first rotating shaft 34 in the first direction A or the second direction B.

[0082] The two ends of the first rotating shaft 34 are respectively fixed on the first side wall 121 and the second side wall 122 . The mounting hole 211 is provided on the first rotating portion 21 .

[0083] During the rotation of the second ladder 20 a , the ratchet 31 is always in a stationary state, and the engaging member 33 rotates along the helical teeth 312 of the ratchet 31 driven by the first rotating portion 21 .

[0084] 11 , for example, the first ladder 10 has a first limiting surface 1231 , and the second ladder 20 a has a second limiting surface 212 . The first limiting surface 1231 cooperates with the second limiting surface 212 and is used to limit the rotation angle of the second ladder 20 a relative to the first ladder 10 .

[0085] Specifically, the bottom wall 123 of the first fixed part 12 has a first limiting surface 1231, and the first rotating part 21 has a second limiting surface 212. During the process of switching the second ladder 20a from the storage state to the deployed state, the first rotating part 21 rotates in the first direction A relative to the first fixed part 12. When the second ladder 20a is in the deployed state, the first limiting surface 1231 overlaps with the second limiting surface 212; during the process of switching the second ladder 20a from the deployed state to the storage state, the first rotating part 21 rotates in the second direction B relative to the first fixed part 12. When the second ladder 20a is in the storage state, the first limiting surface 1231 is opposite to the second limiting surface 212.

[0086] The first limiting surface 1231 is located at the end of the first fixing portion 12 close to the bottom wall 123 of the first fixing portion 12. When the second ladder 20a is in the retracted state, the second limiting surface 212 is opposite to the first limiting surface 1231. When the second ladder 20a is in the unfolded state, the second limiting surface 212 overlaps with the first limiting surface 1231.

[0087] By setting the first limiting surface 1231 and the second limiting surface 212, when the second ladder 20a rotates to the second state in the first direction A relative to the first ladder 10, the second limiting surface 212 overlaps with the first limiting surface 1231 to limit the second ladder 20a from continuing to rotate, thereby realizing the stepping limiting function of the ladder structure 100.

[0088] 3 and 12 , the ladder structure 100 further includes a third ladder 20 b , the second ladder 20 a is connected to the third ladder 20 b , and the third ladder 20 b slides relative to the second ladder 20 a so that the third ladder 20 b is in a deployed state or a semi-deployed state.

[0089] In which, when the second ladder 20a moves relative to the first ladder 10 to be in an expanded state, the third ladder 20b can slide relative to the second ladder 20a so that the third ladder 20b is in a deployed state or a semi-expanded state. In which, when the third ladder 20b is in the semi-expanded state, the second ladder 20a is in the expanded state, as shown in Figure 6.

[0090] The provision of the third ladder 20b enables the second ladder 20a to be in the unfolded state and the third ladder 20b to be in the deployed state, as shown in FIG12 , to shorten the distance between the ladder structure 100 and the ground, thereby facilitating climbing.

[0091] One of the second ladder 20a and the third ladder 20b is provided with a receiving cavity 221 for accommodating the other of the second ladder 20a and the third ladder 20b. For example, the second ladder 20a is provided with a receiving cavity 221 for accommodating the third ladder 20b; or for another example, the third ladder 20b is provided with a receiving cavity 221 for accommodating the second ladder 20a.

[0092] 13 , for example, the third ladder 20b is provided with a receiving cavity 221, which is used to receive the second ladder 20a. When the third ladder 20b slides relative to the second ladder 20a and is in a deployed state, the second ladder 20a extends out of the receiving cavity 221. When the third ladder 20b slides relative to the second ladder 20a and is in a semi-deployed state, the second ladder 20a is accommodated in the receiving cavity 221.

[0093] When the second ladder 20 a is in the retracted state, the second ladder 20 a is accommodated in the receiving cavity 221 , as shown in FIG. 6 .

[0094] It will be appreciated that the third ladder 20b also has a stowed state. The third ladder 20b can move relative to the first ladder 10 to switch from the stowed state to a semi-expanded state, wherein the second ladder 20a is in the deployed state, as shown in FIG6 . The third ladder 20b then slides relative to the second ladder 20a in the deployed state to switch from the semi-expanded state to the deployed state, as shown in FIG12 . When the ladder structure 100 is folded, the third ladder 20b slides relative to the second ladder 20a to switch from the deployed state to the semi-expanded state. The third ladder 20b and the second ladder 20a move together relative to the first ladder 10, so that both the second ladder 20a and the third ladder 20b are in the stowed state, as shown in FIG2 .

[0095] 14 , for example, the first ladder 10 has a receiving groove 11 on a side facing away from the vehicle body 200 , and the receiving groove 11 is used to receive the third ladder 20 b . When the second ladder 20 a and the third ladder 20 b are both in the stored state, the third ladder 20 b is received in the receiving groove 11 , making the ladder structure 100 as a whole compact.

[0096] The first ladder 10 and the third ladder 20b are both provided with a pedal 50 for users to step on.

[0097] 14, 15, and 16, the locking device 60 includes a lock hook 61, a lock buckle 62, and a control switch 63. The lock hook 61 is provided near the top of the first ladder 10, and the third ladder 20b is provided with a lock buckle 62 that locks with the lock hook 61. The third ladder 20b may be provided with a control switch 63. When the ladder structure 100 is in a fully folded state, the control switch 63 is provided on the side of the third ladder 20b away from the vehicle body 200. Pressing the control switch 63 3. The lock hook 61 can be disengaged from the lock buckle 62. The third ladder 20b and the second ladder 20a as a whole slowly move under the action of their own weight and the first damping force provided by the first connecting assembly 30 until the third ladder 20b is in a semi-expanded state. When the second ladder 20a and the third ladder 20b as a whole rotate relative to the first ladder 10 in the second direction B into the receiving groove 11, the lock hook 61 and the lock buckle 62 are locked, fixing the third ladder 20b in the receiving groove 11 of the first ladder 10.

[0098] Optionally, after the third ladder 20b is locked with the first ladder 10, the lock hook 61 can be disengaged from the lock catch 62 by intelligent control. The third ladder 20b can also be rotated in the second direction B relative to the first ladder 10 by intelligent control so that the third ladder 20b is locked in the receiving groove 11 of the first ladder 10.

[0099] 13 , 17 , and 18 , for example, the ladder structure 100 further includes a limiter 23 , which is connected to both the second ladder 20 a and the third ladder 20 b . The limiter 23 is used to limit the sliding length of the third ladder 20 b relative to the second ladder 20 a .

[0100] The limiting member 23 is rotatably connected to one end of the second ladder 20 a , and the other end of the second ladder 20 a is rotatably connected to the first ladder 10 . The second ladder 20 a is located between the limiting member 23 and the first ladder 10 .

[0101] The receiving cavity 221 is used to receive the limiting member 23 and the second ladder 20 a.

[0102] For example, the limit member 23 is formed with a waist-shaped through hole 232 extending along the length direction of the limit member 23 (the third direction C as shown in Figure 18), and the ladder structure 100 also includes a second connecting component 90, and the second connecting component 90 includes a fixing component 91, and the fixing component 91 passes through the waist-shaped through hole 232, and the opposite ends of the fixing component 91 are respectively fixed to the two opposite side walls of the accommodating cavity 221, and the sliding stroke of the third ladder 20b is equal to the extension length of the waist-shaped through hole 232.

[0103] In the present disclosure, since the first rotating portion 21 at one end of the second ladder 20a is rotatably connected to the first fixed portion 12 of the first ladder 10, and the other end of the second ladder 20a is rotatably connected to one end of the limit member 23, in the length direction of the third ladder 20b, it is actually the third ladder 20b that is displaced relative to the second ladder 20a and the limit member 23 under the action of its own gravity.

[0104] It can be understood that the movement distance of the second ladder 20 a in the receiving cavity 221 is actually the length of the waist-shaped through hole 232 .

[0105] The waist-shaped through hole 232 is a through hole arranged in the width direction of the limiter 23 (the fourth direction D as shown in Figure 18), and the two open ends of the waist-shaped through hole 232 are respectively facing the two side walls of the third ladder 20b in the width direction (the width direction of the third ladder 20b is the same as the width direction of the limiter 23). The fixing member 91 passes through one side wall of the third ladder 20b, the waist-shaped through hole 232 and the other side wall of the third ladder 20b in sequence, and both ends of the fixing member 91 are fixed on the side wall of the third ladder 20b, that is, the fixing member 91 is fixed relative to the third ladder 20b.

[0106] Two opposite side walls of the receiving cavity 221 are formed with sliding grooves 222 , and two opposite sides of the limiting member 23 are formed with protrusions 231 corresponding to the sliding grooves 222 . The third ladder 20 b moves under the action of the protrusions 231 and the sliding grooves 222 .

[0107] The protrusion 231 extends into the slide groove 222 , and the protrusion 231 cooperates with the slide groove 222 , so that the third ladder 20 b slides smoothly under the restriction of the protrusion 231 and the slide groove 222 .

[0108] The third ladder 20b slides under the restriction of the sliding groove 222 and the protrusion 231 until the fixing member 91 abuts against the side walls of the waist-shaped through hole 232 at both ends in the length direction of the limiting member 23, and the third ladder 20b stops moving.

[0109] When the third ladder 20b is in a semi-expanded state, the fixing member 91 abuts against the side wall of the waist-shaped through hole 232 on the side close to the second ladder 20a, and the second ladder 20a is accommodated in the receiving cavity 221; when the third ladder 20b is in a deployed state, the fixing member 91 abuts against the side wall of the waist-shaped through hole 232 on the side away from the second ladder 20a, and the second ladder 20a extends out of the receiving cavity 221.

[0110] In any state of the ladder structure 100, the stopper 23 is always located within the receiving cavity 221. When the third ladder 20b is stepped on, the stopper 23 supports the third ladder 20b, thereby strengthening the structural strength of the third ladder 20b. When the ladder structure 100 is in a semi-expanded state (i.e., the third ladder 20b is in a semi-expanded state), the fixing member 91 abuts against a side wall of the waist-shaped through hole 232 near the first ladder 10. At this time, a stop structure can be provided within the receiving cavity 221 to prevent the third ladder 20b from moving along its length under the action of its own gravity, thereby allowing the third ladder 20b to remain in the semi-expanded state.

[0111] In the present disclosure, no stop structure is provided between the third ladder 20b and the limit member 23, or between the third ladder 20b and the second ladder 20a. After the second ladder 20a and the third ladder 20b are rotated as a whole relative to the first ladder 10 in the first direction A until the third ladder 20b is in a semi-expanded state and the second ladder 20a is in an expanded state, that is, during the process of the third ladder 20b sliding relative to the second ladder 20a to be in a deployed state, the third ladder 20b automatically moves downward under the action of its own gravity, the second ladder 20a is fully extended from the accommodating cavity 221, and the third ladder 20b is bent relative to the second ladder 20a.

[0112] 17 , by disposing the second ladder 20a between the limit member 23 and the first ladder 10, the third ladder 20b slides downward under its own gravity, and the distance between the third ladder 20b and the vehicle body 200 is shortened, making the third ladder 20b more vertical and convenient for stepping on the pedal 50 on the third ladder 20b.

[0113] Please refer to Figure 19. For example, the limit member 23 includes a second rotating portion 233, the second ladder 20a includes a second fixed portion 24, the second fixed portion 24 includes a third side wall 241 and a fourth side wall 242 opposite to each other, the second rotating portion 233 is arranged between the third side wall 241 and the fourth side wall 242, the second connecting component 90 also includes a second rotating shaft 92, the second rotating shaft 92 passes through the third side wall 241, the second rotating portion 233, and the fourth side wall 242 in sequence, and the second rotating portion 233 rotates around the second rotating shaft 92 in the first direction A or the second direction B.

[0114] When the second ladder 20a is in the unfolded state and the third ladder 20b slides relative to the second ladder 20a to the deployed state, the second ladder 20a and the second rotating portion 233 are fully extended from the receiving cavity 221, and the limiting member 23 and the third ladder 20b are both bent relative to the second ladder 20a.

[0115] The second rotating portion 233 extends out of the receiving cavity 221 , so that the second rotating portion 233 can rotate relative to the second fixing portion 24 .

[0116] Two ends of the second rotating shaft 92 are respectively fixed on the third side wall 241 and the fourth side wall 242 .

[0117] Referring to Figures 20 and 21 , during the transition from the semi-deployed state to the deployed state, the second rotating portion 233 rotates relative to the second fixed portion 24 about the second rotating axis 92 in the first direction A. Because the stopper 23 is received within the receiving cavity 221, the third ladder 20b rotates relative to the second ladder 20a toward the side of the vehicle body 200. In the deployed state, the third ladder 20b is closer to the vehicle body 200 than in the semi-deployed state, making the third ladder 20b more vertical and easier for users to step on. During the transition from the deployed state to the semi-deployed state, the second rotating portion 233 rotates relative to the second fixed portion 24 about the second rotating axis 92 in the second direction B. The third ladder 20b rotates relative to the second ladder 20a away from the vehicle body 200. In the semi-deployed state, the third ladder 20b and the second ladder 20a are aligned, as shown in Figures 13 and 14 .

[0118] It can be understood that the number of the second ladder 20a, the limiting member 23 and the third ladder 20b are all two, each second ladder 20a24 is provided with a second fixing portion 24, and each limiting member 23 includes a second rotating portion 233.

[0119] Please refer to Figures 22 and 23. For example, the second rotating portion 233 is formed with an arc-shaped through hole 2331, and the second connecting assembly 90 also includes a positioning member 93. The positioning member 93 is fixedly connected to the second ladder 20a, and the positioning member 93 partially extends into the arc-shaped through hole 2331. The positioning member 93 cooperates with the arc-shaped through hole 2331 and is used to limit the rotation angle of the second ladder 20a relative to the limit member 23.

[0120] One end of the positioning member 93 is fixedly connected to the third side wall 241 , and the rotation stroke of the second rotating portion 233 relative to the second fixing portion 24 is equal to the arc length of the arc-shaped through hole 2331 .

[0121] By providing the positioning member 93 and the arc-shaped through hole 2331, the rotation range of the second rotating part 233 is limited. Since the second rotating part 233 is fixedly connected to the second ladder 20a, the rotation range of the second ladder 20a relative to the limiting member 23 is limited, and the limiting member 23 is always accommodated in the accommodating cavity 221 of the third ladder 20b, which can effectively prevent the third ladder 20b from colliding with the vehicle body 200 during rotation, thereby preventing the third ladder 20b and / or the vehicle body 200 from being damaged.

[0122] For example, the second ladder 20a has a third limiting surface 243 , and the limiting member 23 has a fourth limiting surface 2332 . The third limiting surface 243 and the fourth limiting surface 2332 cooperate to limit the rotation angle of the second ladder 20a relative to the limiting member 23 .

[0123] Specifically, the third limiting surface 243 is provided on the second fixing portion 24 , and the fourth limiting surface 2332 is provided on the second rotating portion 233 . When the third ladder 20 b is in the deployed state, the third limiting surface 243 overlaps with the fourth limiting surface 2332 .

[0124] The third limiting surface 243 is located on the second fixing portion 24 near the end of the second fixing portion 24. When the third ladder 20b is in the deployed state, the third limiting surface 243 overlaps with the fourth limiting surface 2332 to further limit the continued rotation of the second ladder 20a, thereby realizing the stepping limiting function of the third ladder 20b.

[0125] It can be understood that after the third limiting surface 243 and the fourth limiting surface 2332 abut and overlap, the positioning member 93 abuts against the side wall of one end of the arc-shaped through hole 2331 in the arc length direction. Through the limitation of the third limiting surface 243 and the fourth limiting surface 2332, and the limitation of the positioning member 93 and the arc-shaped through hole 2331, the stepping limitation function of the third ladder 20b is enhanced.

[0126] The fourth limiting surface 2332 and the arc-shaped through hole 2331 are located at two opposite ends of the limiting member 23 in the thickness direction, so as to better improve the stability of the limiting.

[0127] Optionally, the second connecting assembly 90 may include a ratchet 31, an elastic member 32, and a mating member 33. The specific structure may be the same as the ratchet 31, elastic member 32, and mating member 33 of the first connecting assembly 30, and the connection and mating methods are similar. By disposing the ratchet 31, elastic member 32, and mating member 33 between the second rotating portion 233 and the second fixed portion 24, the third ladder 20b can rotate slowly when rotating in the first direction A due to its own gravity.

[0128] Optionally, the first rotating portion 21 may also be formed with an arcuate through-hole 2331. The first connecting assembly 30 may include a positioning member 93, one end of which is fixedly connected to the second sidewall 122 and partially extends into the arcuate through-hole 2331. The rotational travel of the first rotating portion 21 relative to the first fixed portion 12 is equal to the arc length of the arcuate through-hole 2331. By providing the positioning member 93 on the first rotating portion 21 and the arcuate through-hole 2331 on the first fixed portion 12, the range of rotation of the first rotating portion 21 is limited, preventing the second ladder 20a from colliding with the vehicle body 200 during rotation, thereby preventing damage to the second ladder 20a and / or the vehicle body 200. Furthermore, the restraint provided by the first limiting surface 1231 and the second limiting surface 212, as well as the restraint provided by the positioning member 93 and the arcuate through-hole 2331 between the first ladder 10 and the second ladder 20a, strengthens the support and restraint function for the second ladder 20a.

[0129] Optionally, the second ladder 20a and the limit member 23 can be accommodated in the first ladder 10, and the limit member 23 is always accommodated in the first ladder 10, and the third ladder 20b can rotate relative to the first ladder 10. When the third ladder 20b rotates in the first direction A relative to the first ladder 10 to a semi-expanded state (as shown in Figure 6), the second ladder 20a and the limit member 23 can slide relative to the first ladder 10 until the second ladder 20a extends out of the first ladder 10 (as shown in Figure 3). After the second ladder 20a extends out of the first ladder 10, the third ladder 20b rotates in the first direction A relative to the second ladder 20a under the action of its own gravity, thereby making the third ladder 20b in a deployed state. Since the third ladder 20b needs to be provided with a pedal 50, which is heavier than the second ladder 20a, a ratchet 31, an elastic member 32, and a fitting member 33 can be provided in the second connecting assembly 90 between the third ladder 20b and the second ladder 20a, so that the third ladder 20b can rotate slowly.

[0130] In the present disclosure, a three-section folding and sliding structure is used to ensure that the ladder structure 100 can achieve climbing on the roof while occupying a small volume. The first fixed part 12, the first rotating part 21, the second fixed part 24, the second rotating part 233, the first connecting component 30, and the second connecting component 90 in the ladder structure 100 are simple to implement, which greatly reduces the production cost.

[0131] The above are some implementation methods of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present disclosure. These improvements and modifications are also considered to be within the scope of protection of the present disclosure.

Claims

1. A ladder structure (100), characterized in that: include: A first ladder (10) and a second ladder (20a), wherein the first ladder (10) and the second ladder (20a) are connected, the first ladder (10) is used to be fixed to a body (200) of a vehicle (1000), and the second ladder (20a) is suitable for moving relative to the first ladder (10) under the action of an external force to be in an unfolded state or a retracted state; A locking device (60) is provided on the first ladder (10), and the locking device (60) is suitable for locking the second ladder (20a) in the storage state.

2. The ladder structure (100) according to claim 1, characterized in that: The first ladder (10) is rotatably connected to the second ladder (20a).

3. The ladder structure (100) according to claim 2, characterized in that: The ladder structure (100) further comprises a first connecting assembly (30), wherein the first connecting assembly (30) is connected to both the first ladder (10) and the second ladder (20a), and provides a first damping force when the second ladder (20a) rotates relative to the first ladder (10) to be in an unfolded state.

4. The ladder structure (100) according to claim 3, characterized in that: The first connecting assembly (30) provides a second damping force when the second ladder (20a) rotates relative to the first ladder (10) to be in a retracted state, and the first damping force is greater than the second damping force.

5. The ladder structure (100) according to claim 3, characterized in that: The first connecting assembly (30) comprises a ratchet (31), an elastic member (32), and a matching member (33); the ratchet (31) is fixed to one of the first ladder (10) and the second ladder (20a); the other of the first ladder (10) and the second ladder (20a) is formed with a mounting hole (211); one end of the elastic member (32) is fixed in the mounting hole (211); the other end of the elastic member (32) is fixedly connected to the matching member (33) so that the end of the matching member (33) matches with the ratchet (31).

6. The ladder structure (100) according to claim 5, characterized in that: A plurality of oblique teeth (312) are provided on a side of the ratchet wheel (31) facing the mounting hole (211), and the plurality of oblique teeth (312) are sequentially arranged in a circumferential direction around the rotation center of the ratchet wheel (31); each of the oblique teeth (312) has an inclined surface (3121) and a stop surface (3122); the inclined surface (3121) faces the mounting hole (211), and the inclined surface (3121) includes a first edge (3123) and a second edge (3124) that are opposite to each other in the circumferential direction of the ratchet wheel (31); along the axial direction of the ratchet wheel (31), the first edge (3123) to the ratchet wheel (31) is parallel to the first edge (3124); The distance between the surface of the wheel (31) facing away from the inclined surface (3121) is smaller than the distance between the second edge (3124) and the surface of the ratchet wheel (31) facing away from the inclined surface (3121); the inclined surface (3121) is inclined from the first edge to (3123) the second edge (3124), the stop surface (3122) is connected to the first edge (3123) of one inclined surface (3121) and the second edge (3124) of an adjacent inclined surface (3121), and the stop surface (3122) intersects with the inclined surface (3121).

7. The ladder structure (100) according to claim 1, characterized in that: The first ladder (10) has a first limiting surface (1231), and the second ladder (20a) has a second limiting surface (212); the first limiting surface (1231) and the second limiting surface (212) cooperate with each other and are used to limit the rotation angle of the second ladder (20a) relative to the first ladder (10).

8. The ladder structure (100) according to claim 1, characterized in that: The ladder structure (100) further comprises a third ladder (20b), the third ladder (20b) being connected to the second ladder (20a), and the third ladder (20b) being adapted to slide relative to the second ladder (20a) so that the third ladder (20b) is in a deployed state or a semi-deployed state.

9. The ladder structure (100) according to claim 8, characterized in that: When the second ladder (20a) moves relative to the first ladder (10) and is in the unfolded state, the third ladder (20b) can slide relative to the second ladder (20a).

10. The ladder structure (100) according to claim 8, characterized in that: One of the second ladder (20a) and the third ladder (20b) is provided with a receiving cavity (221), and the receiving cavity (221) is used to accommodate the other of the second ladder (20a) and the third ladder (20b).

11. The ladder structure (100) according to claim 10, characterized in that: The third ladder (20b) is provided with the receiving cavity (221), and the receiving cavity (221) is used to receive the second ladder (20a); when the third ladder (20b) slides relative to the second ladder (20a) and is in the deployed state, the second ladder (20a) extends out of the receiving cavity (221); when the third ladder (20b) slides relative to the second ladder (20a) and is in the semi-deployed state, the second ladder (20a) is received in the receiving cavity (221).

12. The ladder structure (100) according to claim 11, characterized in that: The ladder structure (100) further comprises a limiting member (23), wherein the limiting member (23) is connected to both the second ladder (20a) and the third ladder (20b), and the limiting member (23) is used to limit the sliding length of the third ladder (20b) relative to the second ladder (20a).

13. The ladder structure (100) according to claim 12, characterized in that: The limiting member (23) is arranged in the receiving cavity (221); the limiting member (23) is formed with a waist-shaped through hole (232) extending along the length direction of the limiting member (23); The ladder structure (100) further comprises a fixing member (91), wherein the fixing member (91) passes through the waist-shaped through hole (232), and opposite ends of the fixing member (91) are respectively fixed to two opposite side walls of the receiving cavity (221).

14. The ladder structure (100) according to claim 12, characterized in that: Two opposite side walls of the receiving cavity (221) are formed with sliding grooves (222), and two opposite sides of the limiting member (23) are formed with convex parts (231) corresponding to the sliding grooves (222), and the third ladder (20b) moves under the action of the convex parts (231) and the sliding grooves (222).

15. The ladder structure (100) according to claim 12, characterized in that: The limiting member (23) and the second ladder (20a) are rotatably connected.

16. The ladder structure (100) according to claim 11, characterized in that: When the third ladder (20b) slides relative to the second ladder (20a) to be in the deployed state, the second ladder (20a) is completely extended out of the receiving cavity, and the third ladder (20b) is bent relative to the second ladder (20a).

17. The ladder structure (100) according to claim 12, characterized in that: The limiting member (23) is formed with an arc-shaped through hole (2331). The ladder structure (100) further comprises a positioning member (93). The positioning member (93) is fixedly connected to the second ladder (20a). A portion of the positioning member (93) extends into the arc-shaped through hole (2331). The positioning member (93) cooperates with the arc-shaped through hole (2331) and is used to limit the rotation angle of the second ladder (20a) relative to the limiting member (23).

18. The ladder structure (100) according to claim 17, characterized in that: The second ladder (20a) has a third limiting surface (243), the limiting member (23) has a fourth limiting surface (2332), and the third limiting surface (243) and the fourth limiting surface (2332) cooperate with each other and are used to limit the rotation angle of the second ladder (20a) relative to the limiting member (23).

19. The ladder structure (100) according to claim 18, characterized in that: The fourth limiting surface (2332) and the arc-shaped through hole (2331) are located at two opposite ends of the limiting member (23) in the thickness direction.

20. A vehicle (1000), characterized in that: include: body(200); According to the ladder structure (100) according to any one of claims 1 to 19, the first ladder (10) is fixed to the vehicle body (200).

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