Full-automatic side-unfolding hidden folding ladder of integrated platform and motor caravan

Abstract

The invention discloses a full-automatic side-unfolding hidden folding ladder of an integrated platform and a motor caravan, and the folding ladder comprises an expansion platform which is located at the bottom of a car door and extends towards the side of a car body; the first driving mechanism is connected to the bottom of the vehicle body and the expansion platform and drives the expansion platform to laterally stretch out or retract to be hidden; the step ladder is arranged on one side portion of the extension platform in an extensible mode, and the second driving mechanism is connected with the extension platform and the step ladder and drives the step ladder to be unfolded or stored below the extension platform; the control system is in signal connection with the first driving mechanism and the second driving mechanism and controls the first driving mechanism and the second driving mechanism to operate automatically. The full-automatic side-unfolding hidden folding ladder of the integrated platform and the motor caravan thoroughly get rid of the dependence on a vertical chassis installation space below a car door, and are naturally connected with the car door; a multifunctional expansion platform is integrated; after the whole device is contracted, the device is hidden under the vehicle and is convenient to use due to automatic unfolding and folding actions.

Description

Technical Field

[0001] This invention relates to the technical field of recreational vehicle equipment, specifically to a fully automatic side-expanding concealed folding ladder and recreational vehicle with an integrated platform. Background Technology

[0002] Motorhomes, especially Class C motorhomes, off-road motorhomes, and heavy-duty truck motorhomes, typically have a high chassis due to their living and lodging functions. To facilitate passenger access, ladder systems have become standard equipment. However, with the diversification of motorhome functions, traditional ladder systems are increasingly showing limitations in terms of installation adaptability, functional integration, and automation:

[0003] 1. Chassis installation space and layout conflict:

[0004] The chassis space of modern motorhomes has become a densely populated functional area, typically housing fuel tanks, battery packs, various water tanks, exhaust treatment systems, and complex wiring harnesses. This layout results in extremely limited space and a complex arrangement in the chassis area directly beneath the vehicle's side doors. Traditional under-chassis retractable or pull-out ladders, whose deployment path requires direct alignment with the vertical space beneath the doors, often interfere with the aforementioned chassis components, preventing ideal alignment and impacting the vehicle's ground clearance and overall aesthetics.

[0005] 2. Limited functionality, unable to meet the needs of extended travel and living:

[0006] Most existing access devices are only designed for the basic function of getting in and out of vehicles, and are mostly simple steps or ladders. As the lifestyle of motorhomes expands, users urgently need more stable and spacious temporary outdoor activity platforms (such as bases for small balconies, storage platforms, or fishing seats) when parking outside their vehicles, while also having a safe observation area before getting out of the vehicle. Traditional single-function steps or ladders cannot provide this kind of extended support, limiting the quality of the motorhome experience.

[0007] 3. Low level of automation and poor user experience:

[0008] Manual mechanical operations, such as foot pedals or manual pull-out mechanisms, are time-consuming and laborious, especially inconvenient for elderly users or those carrying items. Manual mechanisms are often exposed or partially hidden when folded, making them prone to getting dirty with mud and sewage. When folded into the vehicle, they can contaminate the interior environment, and long-term exposure can lead to rust and jamming of the mechanism.

[0009] Therefore, the aforementioned technical problems need to be solved. Summary of the Invention

[0010] To address the above-mentioned technical problems, this invention provides a fully automatic side-expanding concealed folding ladder and a motorhome with an integrated platform. The ladder device can completely eliminate the dependence on the vertical chassis installation space under the vehicle door and connect naturally with the living cabin door of the motorhome; it also integrates a multi-functional expansion platform; after being retracted, it is hidden under the vehicle, and the unfolding and folding actions are automated, making it convenient to use.

[0011] To achieve the above objectives, the technical solution of the present invention is as follows:

[0012] A fully automatic side-expanding concealed folding ladder with an integrated platform, comprising:

[0013] A frame seat, located at the bottom of the vehicle body, has an extension platform extending to the side of the vehicle body on its upper part;

[0014] The first drive mechanism has its fixed end connected to the bottom of the vehicle body and its movable end connected to the frame seat, driving the frame seat to move linearly perpendicular to the vehicle body direction, and to laterally unfold or retract to hide the extended platform.

[0015] The staircase is arranged parallel to the vehicle body in the direction of ascent. The upper end of the staircase is rotatably hinged to the frame base and located at one end of the extended platform. The staircase is formed by splicing together upper and lower sections.

[0016] The second drive mechanism has its fixed end rotatably hinged to the frame base and its movable end rotatably hinged to the stair treads. The second drive mechanism extends to unfold the two sections of the stair treads into an inclined climbing state, and the second drive mechanism retracts to fold the two sections of the stair treads and store them under the extended platform.

[0017] The control system connects the first drive mechanism and the second drive mechanism with signals and controls their automated operation.

[0018] The integrated platform features an extended platform on its frame of a fully automatic side-expanding concealed folding ladder. This allows the extended platform to extend directly beneath the vehicle's middle door, with the steps connecting seamlessly to it. This eliminates reliance on vertical chassis mounting space beneath the door and allows for a natural connection with the RV's living compartment door. The extended platform can also be used as a small balcony or storage area, and includes a pre-exit safety observation function, enhancing the user experience.

[0019] The step ladder is formed by two sections joined together, and when not in use, the two sections fold and store under the extension platform. The first drive mechanism drives the frame base, which, along with the extension platform and the step ladder, retracts and hides under the vehicle. The automated operation is convenient, and the concealed design makes the overall appearance aesthetically pleasing.

[0020] A further optimization includes a guardrail located on the outer edge of the extended platform and extending upwards. The guardrail protects people and objects on the extended platform, preventing falls and improving safety; it can also be used as a handrail.

[0021] A further optimized solution includes a third drive mechanism, whose fixed end is connected to the frame base and whose movable end is connected to the guardrail. This mechanism drives the guardrail to move up and down, unfolding it when moved upwards and positioning it below the extended platform when moved downwards. The third drive mechanism automates the raising and lowering of the guardrail, making it convenient to use.

[0022] Further optimization of the design includes an outer cover plate, which is fixedly connected to the outside of the frame base, covering the expansion platform and the space below it. The outer cover plate can hide and cover automated components to prevent accidental contact, ensure safety, and also improve the overall aesthetics.

[0023] The scheme is further optimized so that the staircase includes a first connecting rod, a second connecting rod, and a third connecting rod respectively disposed on both sides thereon;

[0024] One end of the first connecting rod is rotatably hinged to the frame base, the other end of the first connecting rod is rotatably hinged to one end of the second connecting rod, the middle part and the other end of the second connecting rod are respectively rotatably hinged to the two sides of the step ladder, and the two ends of the third connecting rod are respectively rotatably hinged to the two sides of the step ladder.

[0025] The second drive mechanism extends, and the first, second, and third connecting rods on both sides of the staircase are unfolded, keeping the two sections of the staircase connected vertically and in an inclined and fixed state. In the folded state, the two sections of the staircase are arranged in a vertically aligned front-to-back position.

[0026] The two sections of the staircase are connected by second and third connecting rods on both sides, allowing them to be joined vertically. The second drive mechanism extends and locks, while the first connecting rod provides support, ensuring the staircase remains tilted and fixed after joining. When the second drive mechanism retracts, the rotational motion between the three connecting rods causes the two sections of the staircase to rotate and shift, aligning them vertically and storing them under the extended platform.

[0027] In a further optimized design, several guide rail slider mechanisms are arranged side-by-side and spaced apart between the frame seat and the bottom of the vehicle body. Driven by the first drive mechanism, the frame seat moves linearly along these guide rail slider mechanisms. These multiple guide rail slider mechanisms ensure the smooth and reliable linear movement of the frame seat.

[0028] A further optimized design incorporates a cylinder as the first drive mechanism. The cylinder, as the first drive mechanism, is small in size, facilitating installation and use under the chassis.

[0029] A further optimized design incorporates a cylinder as the second drive mechanism. The cylinder, as the first drive mechanism, is small in size, facilitating installation and use at the bottom of the expansion platform.

[0030] A further optimized solution involves using a rodless cylinder as the third drive mechanism. The rodless cylinder, as the third drive mechanism, is small in size and facilitates installation and use on the side of the frame base.

[0031] In a further optimized design, the second connecting rod has a central protrusion that is rotatably hinged to the upper side of the stair tread, and the third connecting rod has a clearance groove in the middle position.

[0032] The first, second, and third connecting rods on both sides of the stair tread form a rotating structure that rotates on the frame base. The rotating structure includes six rotation points formed by the rotational hinge positions of each connecting rod.

[0033] The protruding part in the middle of the second link facilitates the rotational folding angle between the links, and also creates a clearance position for the third link when folded; the clearance groove of the third link is formed at the ends of the first and second links when the three links are folded. The two sections of the stair tread switch between unfolded and folded states through the rotation of the rotating structures on both sides.

[0034] A recreational vehicle comprising a fully automated side-expanding concealed folding ladder of any of the aforementioned integrated platforms.

[0035] The fully automatic side-expanding concealed folding ladder and recreational vehicle of the integrated platform of the present invention have the following technical advantages compared with the prior art:

[0036] 1. Completely solves the installation problem caused by chassis space limitations, achieving ideal alignment with the car door:

[0037] Through the core design of horizontal expansion, the extension platform and folding ladder can extend from the side of the vehicle, completely avoiding the complex chassis space occupied by fuel tanks, water tanks, etc. under the door. This allows the step ladder to be precisely extended to the bottom of the door, forming a natural and smooth route for getting on and off the vehicle. This fundamentally overcomes the pain point of traditional chassis-mounted steps that cannot be installed in the correct position due to space interference.

[0038] 2. It represents a leap from a single climbing tool to a multifunctional outdoor living platform:

[0039] Once deployed, the integrated extension platform not only serves as a stable transition for ascending to higher ground, but also provides a spacious temporary outdoor space that can be used as a safe observation platform, a small balcony, or a storage platform, significantly expanding the scenarios and experiences of travel and living, and meeting users' needs for multifunctional integrated equipment.

[0040] 3. It achieves fully automatic retraction and complete concealment, greatly improving convenience and the overall aesthetics of the vehicle:

[0041] Through the coordinated control of the first and second drive mechanisms, users can automatically deploy and retract the ladder and platform with a single button. Once retracted, the entire system is completely concealed under the vehicle and covered by an outer cover, avoiding the risks of dirt, rust, and impacts from exposed components. This also maintains the cleanliness and aesthetics of the vehicle's exterior, achieving a balance between intelligence and aesthetics.

[0042] 4. Through integrated proactive safety design, overall safety is significantly enhanced:

[0043] The system integrates automatically lifting guardrails that rise to form a protective barrier when the platform is unfolded, effectively preventing people and objects from falling. At the same time, the stair treads achieve stable unfolding and orderly folding through a multi-link mechanism, ensuring the structural rigidity of the two sections of the stair treads during use and their compactness when stored. Attached Figure Description

[0044] Figure 1 This is a perspective view of a specific embodiment of the fully automatic side-expanding concealed folding ladder of the integrated platform of the present invention after it has been fully unfolded.

[0045] Figure 2 yes Figure 1 The middle step stairs are folded down, the guardrails are lowered, and only the extended platform is shown in the 3D view;

[0046] Figure 3 yes Figure 2 A 3D view showing the extended platform retracting and being hidden under the vehicle body;

[0047] Figure 4 yes Figure 3 A 3D view of the fully automatic side-expanding concealed folding ladder from the integrated platform;

[0048] Figure 5 yes Figure 2 A 3D view of the fully automatic side-expanding concealed folding ladder from the integrated platform;

[0049] Figure 6 yes Figure 5 A three-dimensional view of the middle frame base;

[0050] Figure 7 yes Figure 1 A 3D view of the fully automatic side-expanding concealed folding ladder from the integrated platform;

[0051] Figure 8 yes Figure 7 A stereoscopic view from another perspective;

[0052] Figure 9 yes Figure 8 A stereoscopic view from another perspective;

[0053] Figure 10 View from the bottom Figure 1 A 3D view of the fully automatic side-expanding hidden folding ladder fixed to the bottom of the vehicle body on the integrated platform.

[0054] In the figure: Frame base 1, extension platform 2, first drive mechanism 3, step ladder 4, first connecting rod 41, second connecting rod 42, middle protrusion 42a, third connecting rod 43, clearance groove 43a, rotation point 44, second drive mechanism 5, guardrail 6, third drive mechanism 7, outer cover plate 8, step hole 8a, guide rail slider mechanism 9, body A. Detailed Implementation

[0055] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0056] like Figures 1 to 10 As shown, this invention provides a specific embodiment of a fully automatic side-expanding concealed folding ladder based on the integrated platform of the present invention.

[0057] like Figure 1 , Figure 8 and Figure 10 As shown, the fully automatic side-expanding concealed folding ladder of the integrated platform in this embodiment includes:

[0058] The frame seat 1 is located at the bottom of the vehicle body A, and the upper part of the frame seat 1 is provided with an extension platform 2 extending to the side of the vehicle body A;

[0059] The first drive mechanism 3 has its fixed end connected to the bottom of the vehicle body A and its moving end connected to the frame seat 1. It drives the frame seat 1 to move in a straight line perpendicular to the direction of the vehicle body A, and to laterally unfold or retract to hide the extension platform 2.

[0060] Step ladder 4 is set parallel to vehicle body A in the direction of climbing. The upper end of step ladder 4 is rotatably hinged to frame seat 1 and located at one end of extension platform 2. Step ladder 4 is formed by splicing two sections, upper and lower. The upper section of step ladder 4 overlaps and supports the lower section.

[0061] The second drive mechanism 5 has its fixed end rotatably hinged to the frame base 1 via a hinge shaft, and its moving end rotatably hinged to the step ladder 4 via a hinge shaft. The second drive mechanism 5 extends to unfold the two sections of the step ladder 4 into an inclined climbing state, and the second drive mechanism 5 retracts to fold the two sections of the step ladder 4 and store them under the extension platform 2.

[0062] The control system (not shown in the figure) is connected to the first drive mechanism 3 and the second drive mechanism 5 and controls their automatic operation.

[0063] Preferably, the first drive mechanism 3 and the second drive mechanism 5 are both cylinders. Cylinders, as drive mechanisms, are small in size, facilitating installation and use on the chassis and the lower part of the extension platform 2. The first drive mechanism 3 and the second drive mechanism 5 are not limited to cylinder drives; any linear drive mechanism can be used, such as a motor-driven rack and pinion mechanism or a motor-driven lead screw mechanism.

[0064] The integrated platform features an extended platform 2 on its frame 1, which houses a fully automatic side-expanding concealed folding ladder. This allows the extended platform 2 to extend directly beneath the vehicle's middle door. The step ladder 4 connects to the extended platform 2, completely eliminating reliance on vertical chassis mounting space below the door and seamlessly integrating with the RV's living compartment door. The extended platform 2 can also be used as a small balcony or storage platform, and it includes a pre-exit safety observation function, enhancing the user experience.

[0065] The step ladder 4 is formed by two sections joined together, and when not in use, the two sections are folded and stored under the extension platform 2. The first drive mechanism 3 drives the frame seat 1, which, together with the extension platform 2 and the step ladder 4, is retracted and hidden under the vehicle. The automated operation is convenient to use, and the hidden design makes the overall appearance aesthetically pleasing.

[0066] like Figure 5 and Figure 6 As shown, the frame base 1 includes a horizontal frame and a vertical frame set at right angles, and a support frame for the extension platform 2 is provided in the middle of the horizontal frame.

[0067] like Figure 1 ,and Figure 7 As shown, the fully automatic side-expanding concealed folding ladder of this embodiment also includes a guardrail 6, which is located on the outer side of the edge of the extended platform 2 and extends upward. The guardrail 6 protects people and objects on the extended platform 2, preventing them from falling off the extended platform 2, improving safety, and can also be used as a handrail.

[0068] like Figure 4 and Figure 9 As shown, the fully automatic side-expanding concealed folding ladder of this embodiment's integrated platform also includes a third drive mechanism 7. Its fixed end is connected to the frame base 1, and its movable end is connected to the guardrail 6. It drives the guardrail 6 to move up and down, unfolding the guardrail 6 when it moves upward, and placing the guardrail 6 below the extended platform 2 when it moves downward. The guardrail 6 is raised or lowered automatically by the third drive mechanism 7, making it convenient to use.

[0069] Preferably, the third drive mechanism 7 is a rodless cylinder; the rodless cylinder, as the third drive mechanism 7, is small in size and convenient for installation and use on the side of the frame base 1. Figure 5As shown, there are two rodless cylinders arranged side by side with spacing between them. Their sliders are connected to the guardrail 6, and the cylinder bodies are connected to the frame base 1. The sliders move up and down to raise and lower the guardrail 6. The third drive mechanism 7 is not limited to rodless cylinder drive; any linear drive mechanism can be used, such as a motor-driven rack and pinion mechanism or a motor-driven lead screw mechanism.

[0070] like Figure 2 and Figure 3 As shown, the fully automatic side-expanding concealed folding ladder of the integrated platform in this embodiment also includes an outer cover plate 8, which is fixedly connected to the outside of the frame base 1, covering the extension platform 2 and the space below it. The outer cover plate 8 can hide and cover the automated components to avoid accidental contact, ensure safety, and also make the overall appearance more aesthetically pleasing.

[0071] like Figure 8 and Figure 9 As shown, the stair tread 4 includes a first connecting rod 41, a second connecting rod 42, and a third connecting rod 43 respectively disposed on its two sides; one end of the first connecting rod 41 is rotatably hinged to the frame base 1 via a hinge shaft, and the other end of the first connecting rod 41 is rotatably hinged to one end of the second connecting rod 42 via a hinge shaft. The middle part and the other end of the second connecting rod 42 are rotatably hinged to the two sides of the stair tread 4 via hinge shafts, and both ends of the third connecting rod 43 are rotatably hinged to the two sides of the stair tread 4 via hinge shafts.

[0072] The second drive mechanism 5 extends, and the first connecting rod 41, the second connecting rod 42 and the third connecting rod 43 on both sides of the step ladder 4 are unfolded, keeping the two sections of the step ladder 4 connected vertically and in an inclined and fixed state. When folded, the two sections of the step ladder 4 are arranged in a vertically aligned front and back.

[0073] The two sections of the step ladder 4 are connected by the second link 42 and the third link 43 on both sides, so as to achieve vertical splicing. The second drive mechanism 5 extends and locks, and the first link 41 provides support to keep the spliced ​​section in a tilted and fixed state. When the second drive mechanism 5 retracts, the rotation between the three links causes the two sections of the step ladder 4 to rotate and move to a vertical position, which is then stored under the extension platform 2.

[0074] like Figure 5 and Figure 9 As shown, the middle part of the second link 42 has a middle protrusion 42a that is rotatably hinged to the upper side of the step ladder 4, and the middle part of the third link 43 is provided with a relief groove 43a; the first link 41, the second link 42 and the third link 43 on both sides of the step ladder 4 form a rotating structure that rotates on the frame base 1, and the rotating structure includes six rotation points 44 formed by the rotational hinge positions of each link.

[0075] The middle protrusion 42a of the second link 42 facilitates the rotational folding angle between the links, and also creates a clearance position for the third link 43 when folded; the clearance groove 43a of the third link 43 is formed at the clearance position of the ends of the first link 41 and the second link 42 when the three links are folded. The two sections of the stair tread 4 switch between the unfolded and folded states through the rotation of the rotating structures on both sides.

[0076] like Figure 4 , Figure 8 and Figure 10 As shown, several guide rail slider mechanisms 9 are arranged side-by-side and spaced apart between the frame base 1 and the bottom of the vehicle body A. Under the drive of the first drive mechanism 3, the frame base 1 moves linearly on the guide rail slider mechanisms 9. The several guide rail slider mechanisms 9 ensure the smooth and reliable linear movement of the frame base 1. Preferably, there are three sets of guide rail slider mechanisms 9, arranged side-by-side and spaced apart. The guide rail of each guide rail slider mechanism 9 is fixedly connected to the chassis of the vehicle body A, and each guide rail has two sliders, one in front and one in back, which are fixedly connected to the frame base 1; the sliders slide on the guide rail to realize the linear movement of the frame base 1.

[0077] like Figure 3 As shown, the fully automatic side-expanding concealed folding ladder of the integrated platform in this embodiment retracts and hides at the bottom of the vehicle body A when not in use. In case of emergency, if it is necessary to get on or off through the door, there are three step holes 8a in the vertical direction of the outer cover plate 8, which can be used to step on the step holes 8a and cooperate with the handrails in the carriage to get on and off.

[0078] like Figure 4 As shown, at this time, the slider of the rodless cylinder, which serves as the third drive mechanism 7, is located at the bottom, while the cylinders of the second drive mechanism 5 and the first drive mechanism 3 are in the retracted state.

[0079] like Figure 2 As shown, in this embodiment, when the fully automatic side-expanding concealed folding ladder of the integrated platform is in use, the cylinder, which serves as the first drive mechanism 3, extends the extended platform 2. Next, as... Figure 1 As shown, the rodless cylinder, which is the third drive mechanism 7, raises the guardrail 6, and the cylinder, which is the second drive mechanism 5, extends to unfold the step ladder 4 into an inclined ladder.

[0080] The present invention also discloses a recreational vehicle, including a fully automatic side-expanding concealed folding ladder of the aforementioned integrated platform.

[0081] The invention's integrated platform features a fully automatic side-expanding concealed folding ladder and motorhome. The ladder device completely eliminates the reliance on the vertical chassis mounting space below the vehicle door and seamlessly connects with the motorhome's living cabin door. It also integrates a multi-functional extension platform. When retracted, the entire structure is hidden under the vehicle, and the unfolding and folding actions are automated, making it convenient to use.

[0082] In summary, as described in the specification and figures, this invention has been manufactured into actual samples and tested multiple times. The test results demonstrate that the invention achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of the invention. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this invention without departing from the scope of the technical features and similar features of this invention, based on partial modifications or alterations, are within the protection scope of this invention.

Claims

1. A fully automatic side-expanding concealed folding ladder with an integrated platform, characterized in that, include: Extended platform (2), which is located at the bottom of the door and extends to the side of the vehicle body; The first drive mechanism (3) is connected to the bottom of the vehicle body and the extended platform (2), and drives the extended platform (2) to extend laterally or retract and hide. The step ladder (4) can be unfolded and installed on one side of the extension platform (2). The second drive mechanism (5) connects the extended platform (2) and the step ladder (4) and drives the step ladder (4) to unfold or be stored under the extended platform (2); The control system is connected to the first drive mechanism (3) and the second drive mechanism (5) and controls their automatic operation.

2. The fully automatic side-expanding concealed folding ladder of the integrated platform according to claim 1, characterized in that, It also includes a frame seat (1) located at the bottom of the vehicle body, and the extended platform (2) is disposed on the upper part of the frame seat (1).

3. The fully automatic side-expanding concealed folding ladder of the integrated platform according to claim 2, characterized in that, The fixed end of the first drive mechanism (3) is connected to the bottom of the vehicle body, and its moving end is connected to the frame seat (1), driving the frame seat (1) to move in a straight line perpendicular to the vehicle body direction, and to laterally unfold or retract to hide the extended platform (2). The step ladder (4) is set parallel to the vehicle body in the direction of climbing. The upper end of the step ladder (4) is rotatably hinged to the frame seat (1) and located at one end of the extension platform (2). The step ladder (4) is formed by splicing the upper and lower sections. The fixed end of the second drive mechanism (5) is rotatably hinged to the frame base (1), and its moving end is rotatably hinged to the step ladder (4). The second drive mechanism (5) extends to unfold the two sections of the step ladder (4) into an inclined climbing state, and the second drive mechanism (5) retracts to fold the two sections of the step ladder (4) and store them under the extended platform (2).

4. The fully automatic side-expanding concealed folding ladder of the integrated platform according to claim 1, characterized in that, It also includes a guardrail (6), which is located outside the edge of the extended platform (2) and extends upward.

5. The fully automatic side-expanding concealed folding ladder of the integrated platform according to claim 4, characterized in that, It also includes a third drive mechanism (7), whose fixed end is connected to the extended platform (1) and whose movable end is connected to the guardrail (6), driving the guardrail (6) to move up and down, moving upward to unfold the guardrail (6), and moving downward to place the guardrail (6) below the extended platform (2).

6. The fully automatic side-expanding concealed folding ladder of the integrated platform according to claim 2, characterized in that, It also includes an outer cover plate (8), which is fixedly connected to the outside of the frame base (1) and covers the extended platform (2) and the space below it.

7. The fully automatic side-expanding concealed folding ladder of the integrated platform according to claim 3, characterized in that, The step ladder (4) includes a first connecting rod (41), a second connecting rod (42) and a third connecting rod (43) respectively disposed on both sides thereon. One end of the first connecting rod (41) is rotatably hinged to the frame seat (1), and the other end of the first connecting rod (41) is rotatably hinged to one end of the second connecting rod (42). The middle part and the other end of the second connecting rod (42) are rotatably hinged to the two sides of the step ladder (4), and the two ends of the third connecting rod (43) are rotatably hinged to the two sides of the step ladder (4). The second drive mechanism (5) extends, and the first connecting rod (41), the second connecting rod (42) and the third connecting rod (43) on both sides of the step ladder (4) are in an unfolded state, keeping the two sections of the step ladder (4) spliced ​​up and down and in an inclined and fixed state. When in the folded state, the two sections of the step ladder (4) are in a vertical state with the front and back aligned.

8. The fully automatic side-expanding concealed folding ladder of the integrated platform according to claim 2, characterized in that, Several guide rail slider mechanisms (9) are arranged side by side between the frame seat (1) and the bottom of the vehicle body. Under the drive of the first drive mechanism (3), the frame seat (1) moves linearly on the guide rail slider mechanism (9).

9. The fully automatic side-expanding concealed folding ladder of the integrated platform according to claim 1, characterized in that, The first drive mechanism (3) and the second drive mechanism (5) are cylinders.

10. The fully automatic side-expanding concealed folding ladder of the integrated platform according to claim 5, characterized in that, The third drive mechanism (7) is a rodless cylinder.

11. The automatically concealing folding ladder according to claim 7, characterized in that, The second link (42) has a middle protrusion (42a) in the middle part, which is rotatably hinged to the upper side of the step ladder (4), and the third link (43) has a relief groove (43a) in the middle position. The first link (41), the second link (42) and the third link (43) on both sides of the step ladder (4) form a rotating structure that rotates on the frame base (1). The rotating structure includes six rotation points (44) formed by the rotational hinge positions of each link.

12. A recreational vehicle, characterized in that: The fully automatic side-expanding concealed folding ladder includes the integrated platform described in any one of claims 1 to 11.

Images