Turnover telescopic airstairs device

Abstract

The invention provides a turnover telescopic airstair device which comprises a box-shaped base with a containing groove, a rolling wheel and a button hook-shaped lock are installed at the upper end of the containing groove, the rolling wheel is connected to a bearing piece through a pull rope, and a base is installed at the lower end of the containing groove; the bearing part is hinged to the box-shaped base, a guide rail is fixed to the end, hinged to the box-shaped base, of the bearing part, a sliding rail channel is formed between the guide rail and the bearing part, a sliding pair is arranged in the sliding rail channel, one end of the sliding pair is hinged to the base, the other end of the sliding pair is connected to the bearing part through a buffer spring, and a telescopic rod is arranged in the bearing part. A lock ring matched with the button hook-shaped lock is arranged at the lower end part of the bearing piece; the pedal comprises a lower pedal body and a transition pedal body, the lower pedal body is hinged to the tail end of the telescopic rod, the transition pedal body is hinged to the bearing piece and connected to the bearing piece through a tension spring, and when the telescopic rod extends to the maximum state relative to the bearing piece, the transition pedal body is ejected and locked through the telescopic rod.

Description

Technical Field

[0001] The present application belongs to the field of aircraft structure design, and in particular relates to a flip-telescopic boarding ladder device. Background Art

[0002] Currently, many aircraft are equipped with built-in boarding stairs for people to board and leave the aircraft. Equipped with built-in boarding stairs, there are many benefits. First, it allows pilots to quickly board and leave the aircraft without relying on ground boarding stairs and ground staff, which reduces the workload of ground staff and reduces the number of ground staff. Secondly, it eliminates the time for carrying and setting up external boarding stairs, thereby shortening the time for pilots to board and leave the aircraft. Finally, the use of built-in boarding stairs is not affected by parking scenarios, which improves the convenience of boarding and leaving the aircraft. In addition, built-in boarding stairs shorten the aircraft's response time to tasks, improve the aircraft's adaptability to airports, and improve the convenience of aircraft use, making it increasingly widely used in military aircraft. It has become an important symbol for evaluating the advancement of land-based military aircraft and carrier-based aircraft.

[0003] However, the built-in boarding ladder needs to occupy the internal space of the aircraft, and opening the boarding ladder requires personnel to perform additional operations. How to make the boarding ladder occupy less space and open and fold the boarding ladder simple to operate is a problem that needs to be solved in the aircraft structural design. Summary of the invention

[0004] The object of the present application is to provide a flip-telescopic boarding ladder device to solve or alleviate at least one problem in the background technology.

[0005] The technical solution of the present application is: a flip-telescopic boarding ladder device, comprising:

[0006] A box-shaped base having a receiving slot, a reel and a button hook lock are installed at the upper end of the receiving slot, the reel is connected to the bearing member through a pull rope, and a base is installed at the lower end of the receiving slot;

[0007] A bearing member hinged to the box-shaped base, a guide rail is fixed to one end of the bearing member hinged to the box-shaped base, a slide rail channel is formed between the guide rail and the bearing member, a sliding pair is arranged in the slide rail channel, one end of the sliding pair is hinged to the base, and the other end is connected to the bearing member through a buffer spring, a telescopic rod is arranged inside the bearing member, and a lock ring adapted to a button hook lock is arranged at the lower end of the bearing member;

[0008] A pedal with at least two steps, comprising a lower pedal and a transition pedal, wherein the lower pedal is hinged at the end of a telescopic rod, and the transition pedal is hinged on a bearing member and connected to the bearing member via a tension spring. When the telescopic rod is extended to a maximum state relative to the bearing member, the telescopic rod pushes open the transition pedal and locks it.

[0009] In an optional embodiment of the present application, the box-shaped base has an outer surface adapted to the aerodynamic shape of the aircraft and a flange edge surrounding the accommodating groove, and is connected to the aircraft load-bearing structure through the flange edge.

[0010] In an optional implementation manner of the present application, the accommodating groove is a rectangular groove.

[0011] In an optional embodiment of the present application, an elastic protrusion is provided in the receiving groove of the box-shaped base for limiting and absorbing shock of the bearing member installed in the receiving groove.

[0012] In an optional embodiment of the present application, a rotating shaft formed by a cylindrical head is provided at the end of the sliding pair, a guide groove is provided on the base, and the cylindrical head rotating shaft is located in the guide groove and can move along the guide groove.

[0013] In an optional embodiment of the present application, a bent portion bent outward is provided on the upper side of the guide groove, so as to form a limit locking structure when the cylindrical head shaft of the sliding pair enters the bent portion.

[0014] In an optional implementation manner of the present application, the buffer spring is a tension spring.

[0015] In an optional embodiment of the present application, a sliding groove is provided on the telescopic rod, and the bearing member limits the extension of the telescopic rod by means of a limiting pin extending into the sliding groove.

[0016] In an optional embodiment of the present application, the transition pedal is provided with a bent short side near the rotating shaft, and the telescopic rod is provided with an inclined surface on the side opposite to the transition pedal. The end of the inclined surface is a plane, and the inclined surface can be used to push the bent short side to rotate. When the bent short side is parallel to the plane, the transition pedal and the supporting member are locked in rotation.

[0017] In an optional embodiment of the present application, the lower pedal and the transition pedal are spaced apart from each other on the left and right sides in the length direction of the bearing member.

[0018] The boarding ladder device provided in the present application is composed of a telescopic mechanism and a flip slide rail mechanism. The boarding ladder can be opened and used with simple operation to provide a stable stepping structure for boarding and disembarking, which is convenient for ground staff to maintain the aircraft and for pilots to board and disembark the aircraft. After use, the boarding ladder can be closed with simple operation, and the boarding ladder device can be completely folded and stored inside the aircraft, occupying a small space and not affecting the overall aerodynamic shape of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0020] Figure 1This is a schematic diagram of the structure of the flip-telescopic boarding ladder device of the present application.

[0021] Figure 2 This is a schematic diagram of the sliding pair installation in this application.

[0022] Figure 3 This is a schematic diagram of the lower pedal structure in this application.

[0023] Figure 4 This is a schematic diagram of the opening process of the flip-telescopic boarding ladder device of the present application.

[0024] Figure 5 This is a schematic diagram of the fully opened state of the flip-telescopic boarding ladder device of the present application.

[0025] Reference numerals:

[0026] 10-Box-shaped base

[0027] 101-Accommodation slot

[0028] 11-Elastic protrusion

[0029] 12-Reel

[0030] 13-Button Hook Lock

[0031] 14-Drawstring

[0032] 15- Base

[0033] 151-Guide slot

[0034] 152-Bending part

[0035] 20-Bearing parts

[0036] 201-Limiting pin

[0037] 202-Lock Ring

[0038] 21-Guide rail

[0039] 22-Sliding pair

[0040] 23- Shaft

[0041] 24-Buffer spring

[0042] 25-Telescopic rod

[0043] 251-Sliding slot

[0044] 31-Pedal down

[0045] 311-Pedal

[0046] 312-Support

[0047] 32-Transition Pedal

[0048] 321-Bend short side

[0049] 33-Extension spring DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0052] The present application provides a built-in flip-telescopic boarding ladder device that can be folded, occupies a small space and is easy to operate, which provides two-level stepping points for personnel to board and leave the aircraft, so as to facilitate their quick boarding and leaving the aircraft. The boarding ladder allows personnel to manually open and fold the boarding ladder on the aircraft or on the ground, without the need for a motor or a hydraulic actuator to drive, and the boarding ladder device has a simple and compact structure. After the boarding ladder is folded, it can be completely stored inside the aircraft, occupies a small space, and does not affect the appearance of the aircraft.

[0053] like Figure 1 and Figure 2 As shown, the flip-telescopic boarding ladder device provided in the present application includes: a box-shaped base 10, a bearing member 20 and at least two steps of pedals.

[0054] The box-shaped base 10 is the basic component of the flip-telescopic boarding ladder device, and the other components are installed on the box-shaped base 10. The box-shaped base 10 is provided with a receiving groove 101. When the boarding ladder device is closed, all components are stored in the receiving groove 101 of the box-shaped base 10. In some embodiments of the present application, the receiving groove 101 is generally configured as a rectangle to facilitate the storage of various components and space planning. It is understandable that the receiving groove 101 can also be configured as other shapes, such as a semicircular groove.

[0055] The outer surface of the box-shaped base 10 is configured to fit the aerodynamic shape of the aircraft. It is connected to the aircraft skin to form a continuous and smooth aerodynamic surface of the aircraft. The receiving groove 101 of the box-shaped base 10 is designed with flange edges around it. The flange edges can be connected to load-bearing structures such as aircraft frames or beams to achieve the fixation of the box-shaped base 10.

[0056] In some embodiments of the present application, an elastic protrusion 11 is provided in the receiving groove 101 of the box-shaped base 10, and the elastic protrusion 11 can limit and dampen the bearing member 20 installed in the receiving groove 101. In some embodiments, the elastic protrusion 11 can be made of rubber material.

[0057] A reel 12 and a button hook lock 13 are installed in the upper part of the receiving groove 101 of the box-shaped base 10, and the reel 12 is connected to the carrier 20 through a pull rope 14. Among them, a torsion spring mechanism is provided inside the reel 1, and one end of the pull rope 14 is wound around the reel 1 and the other end is fixed to the carrier 20, which can realize the elastic expansion function. Through the set pull rope 14, the passengers on the plane can pull the pull rope 14 to drive the carrier 12 to rotate upward, thereby closing the boarding ladder.

[0058] In the present application, the button hook lock 13 and the lower end of the reel 12 form a flat end surface. When the boarding ladder is closed, the end of the carrier 20 cooperates with the flat end surface, and the locking ring 202 fixed on the flange edge of the lower end of the carrier 20 is inserted into the locking hook of the button hook lock 13 to lock the boarding ladder; when the boarding ladder needs to be opened, the button of the button hook lock 13 is pressed, and the locking hook releases the lock of the locking ring 202, and the boarding ladder can be opened.

[0059] In the present application, a base 15 is fixed to the bottom of the receiving groove 101 of the box-shaped base 10. The base 15 is roughly in a semi-I shape to form a double-ear structure. A guide groove 151 is provided on the surface of the double-ear structure on both sides. The upper end of the sliding pair 22 can slide in the guide groove 151. In the preferred embodiment of the present application, the guide groove 151 is a non-linear groove. The root of the guide groove 151 ( Figure 2 The upper portion (shown in FIG. 1 ) is provided with a bent portion 152, which is used to limit the cylindrical head rotating shaft of the sliding pair 22 to form a limit stop, thereby firmly locking the bearing member 20. Further, the bent portion 152 is configured to bend outward.

[0060] The support member 20 is used to support the pilot when he / she is boarding or leaving the aircraft. The upper end of the support member 20 is hinged to the base 15 via a rotating shaft 23, and the support member 20 can rotate around the rotating shaft 23. When the support member 20 is rotated upward to a closed state, the box-shaped base 10 can be closed. The support member 20 is provided with flange edges adapted to the receiving groove 101. The outer surface ( Figure 1 The bottom surface is a surface adapted to the aircraft shape. In this embodiment of the present application, the carrier 20 is roughly a rectangular structure adapted to the receiving groove 101.

[0061] Guide rails 21 are provided on both sides of the upper end of the bearing member 20. The guide rails 21 are fixedly connected to the bearing member 20 to form two slide rail channels through which the sliding pair 22 can pass. The sliding pair 22 is arranged in the slide rail channel, and a rotating shaft formed by a cylindrical head is provided at its upper end. The cylindrical head rotating shaft is arranged in the guide groove 151, and the lower end is connected to the side of the bearing member 20 through a buffer spring 24, wherein the buffer spring 12 is a tension spring. In some embodiments of the present application, in order to reduce weight, the sliding pair 22 may be provided with one or more weight-reducing holes or weight-reducing grooves along its length direction.

[0062] The bearing member 20 is a hollow structure, and a telescopic rod 25 is arranged inside the bearing member 20. In this embodiment of the present application, the bearing member 20 is a rectangular hollow structure, and accordingly, the telescopic rod 25 is a rectangular cross-section structure. The telescopic rod 25 can slide in the bearing member 20, thereby extending the use length of the bearing member 20. In order to achieve the limit of the bearing member 20 and the telescopic rod 25, a sliding groove 251 is provided on the telescopic rod 25 along its length direction, and a limit pin 201 that can be inserted into the sliding groove 251 is fixedly arranged on the bearing member 20. When the telescopic rod 25 slides to the lower end relative to the bearing member 20, the limit pin 201 limits the telescopic rod 25 to prevent the telescopic rod 25 from sliding out of the bearing member 20. In this embodiment of the present application, the sliding groove 251 is on the plane where the bearing member 20 and the box-shaped base 10 rotate relative to each other. It can be understood that the sliding groove 251 can also be arranged on the plane where the vertical bearing member 20 and the box-shaped base 10 rotate relative to each other. Furthermore, the limit pin 201 is located at a position close to the lower end of the support member 20, which is usually at a certain distance from the lower end of the support member 20. The distance can be set according to requirements, for example, the requirements include the sliding distance of the telescopic rod 25 relative to the support member 20 (i.e., the total length of the boarding ladder), the connection strength between the telescopic rod 25 and the support member 20, etc.

[0063] The pedals at least include a lower pedal 31 and a transition pedal 32. The lower pedal 31 is fixed to the end of the telescopic rod 25 via a rotating shaft, and can rotate 90° relative to the telescopic rod 25. The rotation range is from a state of being in contact with the telescopic rod 25 to a state of being perpendicular to the telescopic rod 25, thereby forming a step for the pilot to board and disembark. Figure 3 As shown, the lower pedal 31 includes a pedal portion 311 and a support portion 312. The pedal portion 311 is a flat plate structure, and the support portion 312 is a semi-I-shaped structure. The pedal portion 311 and the support portion 312 are integrally formed. The lower pedal 31 is hinged to the telescopic rod 25 by a pin passing through the support portion 312 near one side of the pedal portion 311. At the same time, the right part of the support portion 312 forms a limiting mechanism that supports the end of the telescopic rod 25, so that the lower pedal 31 can support the pilot.

[0064] like Figure 4 and Figure 5As shown, the transition pedal 32 is installed on the carrier 20 via a rotating shaft, and can rotate relative to the rotating shaft. In order to realize the automatic opening and folding of the transition pedal 32, a bent short side 321 is provided on the inner side of the transition pedal 32, thereby forming a bent "7"-shaped structure, and its rotating shaft is located at the bending part of the "7"-shaped structure. At the same time, a slope 252 is provided on the side of the telescopic rod 25 relative to the transition pedal 32. When the telescopic rod 25 is close to the maximum extension relative to the carrier 20, the slope 252 cooperates with the bent short side 321, thereby pushing the transition pedal 32 to unfold. At this time, the plane at the end of the slope 252 on the telescopic rod 25 supports the bent short side 321 of the transition pedal 32, thereby forming a pedal for the pilot to step on.

[0065] In the present application, a tension spring 33 is provided on the transition pedal 32 , one end of the tension spring 33 is fixed on the bearing member 20 , and the other end is fixed under the transition pedal 32 , which can force the transition pedal 13 to rotate downward and close.

[0066] It should be noted that two or more transition steps 32 may be provided according to the height of the boarding ladder.

[0067] In a preferred embodiment of the present application, the lower pedal 31 and the transition pedal 32 or more than two transition pedals 32 are spaced apart from each other in the length direction of the support member 20 to facilitate the flight personnel to step on them.

[0068] The installation process of the flip-telescopic boarding ladder device of the present application is as follows:

[0069] First, assemble the relevant components on the carrier 20, insert the telescopic rod 25 into the carrier 20, and limit the limit pin 201 through the sliding groove 251 in the middle of the telescopic rod 25 to be limited on the carrier 20, and then fix the lower pedal 31 and the transition pedal 32 to the telescopic rod 25 and the carrier 20 respectively with a rotating shaft, and fix the two ends of the tension spring 33 to the carrier 20 and the transition pedal 32, and fix the lock ring 202 to the flange edge at the end of the carrier 20; secondly, assemble the flip slide mechanism, and fix the carrier 20 to the base 15 through the rotating shaft 23. Then fix two sliding pairs 22, two guide rails 21, and two buffer springs 24 on both sides of the carrier 20, and install the upper end of the sliding pair 22 with the cylindrical head shaft into the guide groove 151 of the base 15; finally, fix the base 15 at the lower part of the receiving groove 101 of the box-shaped base 10, and then install the reel 12 and the button hook lock 13 at the upper part of the receiving groove 101 of the box-shaped base 10, and fix the lower end of the pull rope 14 on the carrier 20. After the boarding ladder is installed, fix the box-shaped base 10 at an appropriate position on the aircraft for use.

[0070] The working process of the flip-telescopic boarding ladder device of the present application is as follows:

[0071] When the pilot or ground staff board or leave the aircraft, they press the button hook lock 13 to unlock the boarding ladder, and the carrier 20 can be turned downward around the rotating shaft 23 under the action of gravity, and the sliding pair 22 moves relative to the base 15 and the guide rail 21. The sliding pair 22 and the base 15 form a rotating mechanism, and the sliding pair 22 and the guide rail 21 form a sliding mechanism, thereby forming a flip slide device. When the carrier 20 is opened, the upper end rotating shaft of the sliding pair 22 slides upward in the guide groove 151 of the base 15, and the main body of the sliding pair 22 slides relative to the guide rail 21 fixed on the carrier 20. The tension of the buffer spring 12 acts on the moving pair to slow down its sliding speed. After the carrier 20 is fully opened, the upper end of the sliding pair 22 slides to the uppermost bent portion 152 of the guide groove 151 of the base 15, and the stop flange at the other end of the sliding pair 22 also fits against the end surface of the guide rail 21 and cannot continue to slide, thereby limiting the lowering position of the carrier 20, thereby controlling the opening angle of the boarding ladder. When a person steps on the boarding ladder, the carrier 20, the base 15 and the sliding pair 22 form a triangular structure to transfer the load acting on the carrier 20.

[0072] After the support member 20 is turned over to the bottom, the telescopic rod 25 will extend out under the action of gravity. Figure 4 Airstairs shown not fully deployed and Figure 5 The boarding ladder shown is in a fully extended state. When the telescopic rod 25 is extended to the maximum position, the limit pin 201 will fit with the upper end surface of the sliding groove 151 in the middle thereof to limit the extension position of the telescopic rod 25. The transition pedal 32 is designed to be bent. When the telescopic rod 25 is not fully extended, its bent short side 321 will not interfere with the left side of the telescopic rod 25, and it is ensured to be in a closed state under the action of the tension spring 33. The upper end of the left side of the telescopic rod 25 is set as an inclined surface 252. When the telescopic rod 25 is extended to a value close to the maximum extension, the inclined surface 252 will squeeze the bent short side 321 of the transition pedal 32 and force the transition pedal 32 to rotate until it rotates 90°, and the left side of the telescopic rod 25 becomes a plane, which is completely fitted with the end surface of the transition pedal 32, limiting the position of the transition pedal 32. Under the action of gravity, the lower pedal 31 rotates downward 90°, and its position is limited by the lower end surface of the telescopic rod 25.

[0073] After the boarding ladder is fully deployed, the personnel can step on the lower pedal 31 and the transition pedal 32 to board and leave the aircraft.

[0074] After the use of the boarding ladder is completed, the personnel can close the boarding ladder on the ground or on the aircraft. When the personnel is on the ground, the personnel pushes the carrier 20 toward the box-shaped base 10 and closes the carrier 20 by hand. During the closing process, the telescopic rod 25 and the lower pedal 31 will automatically shrink and fold under the action of gravity, and the transition pedal 32 will rotate and fold under the action of the tension spring 33. Finally, the personnel slightly presses the lock ring 202 at the lower end of the carrier 20 into the button hook lock 13 to complete the closing and locking of the boarding ladder. When the personnel is on the aircraft, the personnel pulls the pull rope 14 upward by hand, and the pull rope 14 drives the carrier 20 to rotate upward. After rotating to a certain angle, the personnel can grab the carrier 20 to complete the same folding action as on the ground.

[0075] The boarding ladder device provided by the present application is composed of a telescopic mechanism and a flip slide mechanism. The boarding ladder can be opened and used with a simple operation to provide a stable stepping structure for boarding and disembarking, which is convenient for ground staff to maintain the aircraft and for pilots to board and disembark the aircraft. After use, the boarding ladder can be closed with a simple operation. The boarding ladder device can be completely folded and stored inside the aircraft, taking up little space and not affecting the overall aerodynamic shape of the aircraft.

[0076] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A retractable boarding ladder device, characterized in that: include: A box-shaped base (10) having a receiving groove (101), a reel (12) and a button hook lock (13) being installed at the upper end of the receiving groove (101), the reel (12) being connected to a bearing member (20) via a pull rope (14), and a base (15) being installed at the lower end of the receiving groove (101); A carrier (20) hinged to the box-shaped base (10), a guide rail (21) being fixed to one end of the carrier (20) hinged to the box-shaped base (10), a slide rail channel being formed between the guide rail (21) and the carrier (20), a sliding pair (22) being arranged in the slide rail channel, one end of the sliding pair (22) being hinged to the base (15), and the other end being connected to the carrier (20) via a buffer spring (24), a telescopic rod (25) being arranged inside the carrier (20), and a lock ring (202) being adapted to a button hook lock (13) being arranged at the lower end of the carrier (20); A pedal with at least two steps, the pedal comprising a lower pedal (31) and a transition pedal (32), the lower pedal (31) being hinged at the end of a telescopic rod (25), the transition pedal (32) being hinged on a bearing member (20) and connected to the bearing member (20) via a tension spring (33), and when the telescopic rod (25) is extended to a maximum state relative to the bearing member (20), the telescopic rod (25) pushes the transition pedal (32) open and locks it.

2. The flip-telescopic boarding ladder device according to claim 1, characterized in that: The box-shaped base (10) has an outer surface adapted to the aerodynamic shape of the aircraft and a flange edge surrounding the receiving groove (101), and is connected to the aircraft bearing structure via the flange edge.

3. The flip-telescopic boarding ladder device according to claim 2, characterized in that: The containing groove (101) is a rectangular groove.

4. The flip-telescopic boarding ladder device according to claim 1 or 2, characterized in that: An elastic protrusion (11) is provided in the receiving groove (101) of the box-shaped base (10) for limiting and absorbing the vibration of the bearing member (20) installed in the receiving groove (101).

5. The flip-telescopic boarding ladder device according to claim 1, characterized in that: The end of the sliding pair (22) is provided with a rotating shaft formed by a cylindrical head, and the base (15) is provided with a guide groove (151), and the cylindrical head rotating shaft is located in the guide groove (151) and can move along the guide groove (151).

6. The flip-telescopic boarding ladder device according to claim 5, characterized in that: The upper side of the guide groove (151) is provided with a bent portion (152) bent outwards, which is used to form a position limiting and blocking structure when the cylindrical head rotating shaft of the sliding pair (22) enters the bent portion (152).

7. The flip-telescopic boarding ladder device according to claim 1, characterized in that: The buffer spring (24) is a tension spring.

8. The flip-telescopic boarding ladder device according to claim 1, characterized in that: The telescopic rod (25) is provided with a sliding groove (251), and the bearing member (20) limits the extension of the telescopic rod (25) by means of a limiting pin (201) extending into the sliding groove (251).

9. The flip-telescopic boarding ladder device according to claim 1, characterized in that: The transition pedal (32) is provided with a bent short side (321) near the rotating shaft, and the telescopic rod (25) is provided with an inclined surface (252) on a side opposite to the transition pedal (32). The end of the inclined surface (252) is a plane, and the inclined surface (252) can be used to push the bent short side (321) to rotate. When the bent short side (321) is parallel to the plane, the transition pedal (32) and the bearing member (20) are locked in rotation.

10. The flip-telescopic boarding ladder device according to claim 1, characterized in that: The lower pedal (31) and the transition pedal (32) are spaced apart from each other in the left and right directions along the length of the bearing member (20).

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