Airborne foldable airplane boarding ladder suitable for multiple aircrafts

Abstract

The utility model relates to an airborne foldable airplane boarding ladder suitable for multiple aircrafts. The airborne foldable airplane boarding ladder comprises a ladder head unit body and a ladder body unit body, the number of the ladder head unit body is one, and the ladder head unit body is matched with an airplane body in a hanging mode. The number of the ladder body unit body is at least one, and the ladder body unit body and the ladder head unit body are connected through a positionable hinge mechanism; when the number of the ladder body unit bodies is multiple, the ladder body unit bodies are sequentially connected in series, and the adjacent ladder body unit bodies are connected through the locatable hinge mechanisms. Compared with an existing boarding ladder with an integral steel pipe truss structure and an existing boarding ladder with a hinged type foldable structure, the airborne foldable boarding ladder suitable for multiple types of aircrafts has the advantages that the structure is simple; the unmanned aerial vehicle is suitable for multiple types, adjustable in length, foldable, small in occupied space after being folded, airborne, capable of stably maintaining the size after being airborne, capable of being adjusted to be in a rigid state after being unfolded, good in boarding stability, capable of stably maintaining the small size state after being folded and high in airborne safety for the first time.

Description

Technical Field

[0001] This utility model belongs to the field of boarding ladder technology, and in particular relates to an airborne foldable aircraft boarding ladder applicable to multiple aircraft models. Background Technology

[0002] Currently, apart from a few types of aircraft such as large passenger planes, many small and medium-sized fixed-wing aircraft require boarding stairs for pilots to board. At present, common boarding stairs are mainly divided into two types: one is a boarding stairs with an integral steel truss structure, and the other is a boarding stairs with a hinged, foldable structure.

[0003] For boarding stairs with an integral steel pipe truss structure, the space occupied by the boarding stairs is relatively large, so they are usually not carried on the aircraft. Each time the boarding stairs are used, ground staff need to place them in a suitable position on the aircraft in advance. After the pilot completes the boarding operation through the boarding stairs, the ground staff will remove the boarding stairs from the aircraft. The pilot cannot complete the loading and unloading of the boarding stairs. After the boarding stairs are removed from the aircraft, they also need to be transferred to a dedicated area for storage and routine maintenance. If different aircraft models are used, a separate set of boarding stairs needs to be configured for each model, resulting in high procurement costs and high daily maintenance costs for boarding stairs.

[0004] For articulated foldable boarding stairs, there is generally a lack of length adjustment design. Although the space occupied by the boarding stairs can be reduced by folding, if the length of the boarding stairs after unfolding is too long and the boarding stairs are still in a flexible state when unfolded, the stability during boarding is poor. The boarding stairs can also easily unfold again after being folded, and it is impossible to keep the folded boarding stairs stably in a small size, which will bring safety hazards to the airborne process. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides an airborne foldable aircraft boarding ladder applicable to multiple aircraft models. Compared with the existing boarding ladders with integral steel pipe truss structure and hinged foldable structure, it achieves for the first time the combination of being applicable to multiple aircraft models, having an adjustable length, being foldable, occupying little space after folding, being airborne, maintaining a stable size after being airborne, being able to be adjusted to a rigid state after unfolding, having good stability during boarding, maintaining a small size after folding, and having high airborne safety.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an airborne foldable aircraft boarding ladder applicable to multiple aircraft models, comprising a ladder head unit and a ladder body unit; the ladder head unit is one in number and is attached to the aircraft fuselage; the ladder body unit is at least one in number and is connected to the ladder head unit by a positionable hinge mechanism.

[0007] When there are multiple ladder body units, the ladder body units are connected in series sequentially, and adjacent ladder body units are also connected by a positionable hinge mechanism.

[0008] The ladder head unit includes a front hook section, a middle support section, and a rear transition section; the front hook section and the middle support section, as well as the middle support section and the rear transition section, are connected by a ladder head hinge shaft, and a ladder head clamping screw is screwed to the axial end of the ladder head hinge shaft; an aircraft fuselage support and abutment mechanism is provided on the ladder head hinge shaft between the middle support section and the rear transition section.

[0009] The aircraft fuselage support and contact mechanism includes a V-shaped contact frame and a U-shaped limiting rod. A contact frame adapter sleeve is fixedly installed at the end of one arm of the V-shaped contact frame. The adapter sleeve is coaxially fitted onto the hinge shaft at the top of the ladder. The adapter sleeve has a degree of rotational freedom on the hinge shaft. A rubber protective pad is affixed to the outer surface of the other arm of the V-shaped contact frame. Limiting slots are provided on the outer surface of the V-shaped contact frame arm on the same side as the adapter sleeve. Several limiting slots are evenly distributed at equal intervals. Both arms of the U-shaped limiting rod are hinged to the middle support section of the ladder unit. The middle support section of the U-shaped limiting rod has a degree of swing freedom. The bottom beam of the U-shaped limiting rod is parallel to and engages with the limiting slots.

[0010] A limiting baffle is fixedly installed on the rear transition section, and a limiting groove is installed on the intermediate support section. The limiting baffle and the limiting groove are engaged in a locking fit.

[0011] The ladder body unit includes a front ladder body section and a rear ladder body section; the front ladder body section and the rear transition section of the ladder head unit are connected by a ladder body hinge shaft, and a ladder body clamping screw is screwed and fixed at the axial end of the ladder body hinge shaft.

[0012] The positionable hinge mechanism includes a ladder body hinge shaft, a positioning sleeve, a sleeve positioning screw, and a ladder body positioning assembly; the positioning sleeve is coaxially mounted on the ladder body hinge shaft, and a positioning screw hole is provided in the middle of the sleeve body; the sleeve positioning screw is screwed into the positioning screw hole, and the sleeve positioning screw passes through the positioning screw hole and is tightly engaged with the ladder body hinge shaft.

[0013] The ladder positioning assembly includes a positioning pin, a pin guide groove, a pin push-reset spring, and a pull handle. The pin guide groove is fixedly installed on the outer surface of the positioning sleeve's opening side. The positioning pin is located inside the pin guide groove, and the pin push-reset spring is located inside the pin guide groove and positioned between the positioning pin and the pin guide groove. The pull handle is fixedly connected to the positioning pin and extends to the outside of the pin guide groove. Positioning holes are provided on the rear transition section of the ladder head unit and the rear ladder section of the ladder body unit, and the positioning pin is inserted into the positioning holes.

[0014] The beneficial effects of this utility model are:

[0015] This utility model presents an airborne foldable aircraft boarding ladder applicable to multiple aircraft models. Compared with existing boarding ladders with integral steel pipe truss structures and hinged foldable structures, it achieves for the first time the combination of being applicable to multiple aircraft models, having an adjustable length, being foldable, occupying little space after folding, being airborne, maintaining stable dimensions after being airborne, being able to be adjusted to a rigid state after unfolding, having good stability during boarding, maintaining a small size after folding, and having high airborne safety. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of an airborne foldable aircraft boarding ladder (in unfolded state) applicable to multiple aircraft models according to this utility model;

[0017] Figure 2 This is a structural schematic diagram of the ladder head unit (in unfolded state) of this utility model;

[0018] Figure 3 This is an exploded view of the ladder head unit of this utility model;

[0019] Figure 4 This is a structural schematic diagram of the ladder body unit (in unfolded state) of this utility model;

[0020] Figure 5 This is an exploded view of the ladder body unit of this utility model;

[0021] Figure 6 This is an exploded view of the positionable hinge mechanism of this utility model.

[0022] Figure 7 This is a structural schematic diagram of an airborne foldable aircraft boarding ladder (folded state) applicable to multiple aircraft models according to this utility model;

[0023] In the diagram, I—ladder head unit, II—ladder body unit, III—positionable hinge mechanism, IV—aircraft fuselage support and abutment mechanism, 1—front hook section, 2—intermediate support section, 3—rear adapter section, 4—ladder head hinge shaft, 5—ladder head clamping screw, 6—V-shaped abutment frame, 7—U-shaped limit rod, 8—abutment frame adapter sleeve, 9—limiting slot, 10—limiting baffle, 11—limiting stop groove, 12—front ladder body section, 13—rear ladder body section, 14—ladder body hinge shaft, 15—ladder body clamping screw, 16—positioning sleeve, 17—sleeve positioning screw, 18—positioning screw hole, 19—positioning pin, 20—pin guide groove, 21—finger handle, 22—positioning socket. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1-7 As shown, an airborne foldable aircraft boarding ladder applicable to multiple aircraft models includes a ladder head unit I and a ladder body unit II; the ladder head unit I is one in number and is attached to the aircraft fuselage; the ladder body unit II is at least one in number and is connected to the ladder head unit I by a positionable hinge mechanism III.

[0026] When there are multiple ladder body units II, several ladder body units II are connected in series sequentially, and adjacent ladder body units II are also connected by a positionable hinge mechanism III.

[0027] The ladder head unit I includes a front hook section 1, an intermediate support section 2, and a rear transition section 3; the front hook section 1 and the intermediate support section 2, and the intermediate support section 2 and the rear transition section 3 are connected by a ladder head hinge shaft 4, and a ladder head clamping screw 5 is screwed to the axial end of the ladder head hinge shaft 4; an aircraft fuselage support and abutment mechanism IV is provided on the ladder head hinge shaft 4 between the intermediate support section 2 and the rear transition section 3.

[0028] The aircraft fuselage support and contact mechanism IV includes a V-shaped contact frame 6 and a U-shaped limiting rod 7. A contact frame adapter sleeve 8 is fixedly installed at the end of one arm of the V-shaped contact frame 6. The contact frame adapter sleeve 8 is coaxially fitted on the ladder head hinge shaft 4. The contact frame adapter sleeve 8 has a degree of rotational freedom on the ladder head hinge shaft 4. A rubber protective pad is attached to the outer surface of the other arm of the V-shaped contact frame 6. A limiting slot 9 is provided on the outer surface of the arm of the V-shaped contact frame 6 on the same side as the contact frame adapter sleeve 8. The limiting slots 9 are numerous and evenly distributed at equal intervals. Both arms of the U-shaped limiting rod 7 are hinged to the middle support section 2 of the ladder head unit I. The middle support section 2 of the U-shaped limiting rod 7 has a degree of swing freedom. The bottom beam of the U-shaped limiting rod 7 is parallel to the limiting slot 9 and is engaged.

[0029] A limiting baffle 10 is fixedly installed on the rear transition section 3, and a limiting groove 11 is provided on the intermediate support section 2. The limiting baffle 10 and the limiting groove 11 are engaged in a locking fit.

[0030] The ladder body unit II includes a front ladder body section 12 and a rear ladder body section 13; the front ladder body section 12 is connected to the rear transition section 3 of the ladder head unit I, and the front ladder body section 12 is connected to the rear ladder body section 13 through a ladder body hinge shaft 14, and a ladder body clamping screw 15 is screwed and fixed at the axial end of the ladder body hinge shaft 14.

[0031] The positionable hinge mechanism III includes a ladder body hinge shaft 14, a positioning sleeve 16, a sleeve positioning screw 17, and a ladder body positioning assembly. The positioning sleeve 16 is coaxially mounted on the ladder body hinge shaft 14. A positioning screw hole 18 is provided in the middle of the sleeve body of the positioning sleeve 16. The sleeve positioning screw 17 is screwed into the positioning screw hole 18 and passes through the positioning screw hole 18 to engage with the ladder body hinge shaft 14.

[0032] The ladder positioning assembly includes a positioning pin 19, a pin guide groove 20, a pin push-reset spring, and a finger handle 21. The pin guide groove 20 is fixedly disposed on the outer surface of the cylinder opening side of the positioning sleeve 16. The positioning pin 19 is located inside the pin guide groove 20. The pin push-reset spring is located inside the pin guide groove 20 and is disposed between the positioning pin 19 and the pin guide groove 20. The finger handle 21 is fixedly connected to the positioning pin 19 and extends to the outside of the pin guide groove 20. Positioning holes 22 are provided on the rear transition section 3 of the ladder head unit I and the rear ladder section 13 of the ladder body unit II. The positioning pin 19 is inserted into the positioning holes 22.

[0033] The following describes a single use of this utility model with reference to the accompanying drawings:

[0034] Taking the initial folded state as an example, when the boarding ladder needs to be used, first unfold the front hook section 1 and the middle support section 2 of the ladder head unit I, and then unfold the rear transition section 3. Before unfolding the rear transition section 3, use a wrench to loosen the sleeve positioning screw 17 at the connection between the rear transition section 3 and the front ladder body section 12, so that the positioning sleeve 16 regains its rotational freedom relative to the ladder body hinge axis 14. Then, pull the finger handle 21 backward to move the positioning pin 19 out of the positioning hole 22. At the same time, the pin push return spring in the pin guide groove 20 is compressed, and the positioning sleeve 16 also regains its rotational freedom relative to the rear transition section 3. At this time, the rear transition section 3 can be unfolded. By analogy, referring to the unfolding steps of the rear transition section 3, the front ladder body section 12 and the rear ladder body section 13 can be fully unfolded.

[0035] When the front ladder section 12 and the rear ladder section 13 of any ladder body unit II are unfolded into a straight posture, adjust the rotation of the positioning sleeve 16 until the positioning pin 19 is aligned with the positioning hole 22 again. At this time, under the push of the pin-pushing return spring, the positioning pin 19 will be pushed back into the positioning hole 22 to complete the locking. At this time, the positioning sleeve 16 and the rear ladder section 13 are fixed again. Then, use a wrench to tighten the sleeve positioning screw 17 to fix the positioning sleeve 16 to the ladder body hinge shaft 14 again. At this time, the position between the front ladder section 12 and the rear ladder section 13 is completely fixed, and the ladder body unit II of the boarding ladder is in a rigid state.

[0036] Once all the front ladder sections 12 and rear ladder sections 13 of ladder unit II are fully extended into a straight position, the boarding ladder can be lowered from the aircraft to the ground. During this lowering, the front hook section 1 needs to be hooked onto the aircraft fuselage, while the side of the V-shaped abutment bracket 6 fitted with rubber protective pads rests against the aircraft surface. These rubber pads protect the fuselage skin from damage. Then, the swing angle of the U-shaped limiting rod 7 is adjusted so that its bottom beam accurately engages with one of the limiting slots 9 on the other side of the V-shaped abutment bracket 6. This adjusts the angle between the rear transition section 3 of ladder unit I and ladder unit II, ensuring that ladder unit II is as perpendicular to the ground as possible. The pilot can then disembark autonomously via the deployed boarding ladder. After the pilot disembarks, the boarding ladder remains at the aircraft and can be used for ground crew boarding and disembarking until aircraft maintenance is completed.

[0037] When aircraft maintenance is completed and the pilot needs to board again, they can directly board via the boarding ladder. The boarding ladder is then retracted. First, the U-shaped limiting rod 7 and the V-shaped abutment frame 6 are released. Then, the boarding ladder is folded and retracted starting from the front hook section 1 and the middle support section 2 of the ladder head unit I. The folding and retraction process is the exact opposite of the boarding ladder unfolding process. After folding, the limiting baffle 10 and limiting groove 11 between the front hook section 1 and the middle support section 2 are completely engaged, ensuring the accuracy of the folding position. When the front ladder section 12 and the rear ladder section 13 of the last ladder body unit II are folded, the entire boarding ladder is simultaneously folded and retracted. At this point, the boarding ladder is at its minimum size, minimizing space occupation and allowing for easy onboard storage. Furthermore, the folded boarding ladder is restrained by the tightened sleeve positioning screw 17 and the positioning pin 19 inserted into the positioning hole 22, preventing it from unfolding. Therefore, it maintains stable attitude during onboard operation, thus improving onboard safety.

[0038] In addition, when the aircraft type changes, the number of ladder unit II can be adjusted according to the aircraft height. Furthermore, by adjusting the bottom beam of the U-shaped limit rod 7 to engage with the limit slot 9 at different positions, the V-shaped attachment frame 6 can ensure that the ladder unit II is perpendicular to the ground during the attachment process with different aircraft, thus ensuring that the boarding experience remains unchanged when facing different aircraft types.

[0039] The solutions in the embodiments are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications that do not depart from the scope of protection of this utility model are included in the scope of protection of this utility model.

Claims

1. A foldable airborne aircraft boarding ladder suitable for multiple aircraft models, characterized in that: It includes a ladder head unit and a ladder body unit; the ladder head unit is one in number and is attached to the aircraft fuselage; the ladder body unit is at least one in number and is connected to the ladder head unit by a positionable hinge mechanism.

2. The airborne foldable aircraft boarding ladder applicable to multiple aircraft models according to claim 1, characterized in that: When there are multiple ladder body units, the ladder body units are connected in series sequentially, and adjacent ladder body units are also connected by a positionable hinge mechanism.

3. The airborne foldable aircraft boarding ladder applicable to multiple aircraft models according to claim 1, characterized in that: The ladder head unit includes a front hook section, a middle support section, and a rear transition section; the front hook section and the middle support section, as well as the middle support section and the rear transition section, are connected by a ladder head hinge shaft, and a ladder head clamping screw is screwed to the axial end of the ladder head hinge shaft; an aircraft fuselage support and abutment mechanism is provided on the ladder head hinge shaft between the middle support section and the rear transition section.

4. The airborne foldable aircraft boarding ladder applicable to multiple aircraft models according to claim 3, characterized in that: The aircraft fuselage support and contact mechanism includes a V-shaped contact frame and a U-shaped limiting rod. A contact frame adapter sleeve is fixedly installed at the end of one arm of the V-shaped contact frame. The adapter sleeve is coaxially fitted onto the hinge shaft at the top of the ladder. The adapter sleeve has a degree of rotational freedom on the hinge shaft. A rubber protective pad is affixed to the outer surface of the other arm of the V-shaped contact frame. Limiting slots are provided on the outer surface of the V-shaped contact frame arm on the same side as the adapter sleeve. Several limiting slots are evenly distributed at equal intervals. Both arms of the U-shaped limiting rod are hinged to the middle support section of the ladder unit. The middle support section of the U-shaped limiting rod has a degree of swing freedom. The bottom beam of the U-shaped limiting rod is parallel to and engages with the limiting slots.

5. The airborne foldable aircraft boarding ladder applicable to multiple aircraft models according to claim 3, characterized in that: A limiting baffle is fixedly installed on the rear transition section, and a limiting groove is installed on the intermediate support section. The limiting baffle and the limiting groove are engaged in a locking fit.

6. The airborne foldable aircraft boarding ladder applicable to multiple aircraft models according to claim 1, characterized in that: The ladder body unit includes a front ladder body section and a rear ladder body section; the front ladder body section and the rear transition section of the ladder head unit are connected by a ladder body hinge shaft, and a ladder body clamping screw is screwed and fixed at the axial end of the ladder body hinge shaft.

7. The airborne foldable aircraft boarding ladder applicable to multiple aircraft models according to claim 6, characterized in that: The positionable hinge mechanism includes a ladder body hinge shaft, a positioning sleeve, a sleeve positioning screw, and a ladder body positioning assembly; the positioning sleeve is coaxially mounted on the ladder body hinge shaft, and a positioning screw hole is provided in the middle of the sleeve body; the sleeve positioning screw is screwed into the positioning screw hole, and the sleeve positioning screw passes through the positioning screw hole and is tightly engaged with the ladder body hinge shaft.

8. The airborne foldable aircraft boarding ladder applicable to multiple aircraft models according to claim 7, characterized in that: The ladder positioning assembly includes a positioning pin, a pin guide groove, a pin push-reset spring, and a pull handle. The pin guide groove is fixedly installed on the outer surface of the positioning sleeve's opening side. The positioning pin is located inside the pin guide groove, and the pin push-reset spring is located inside the pin guide groove and positioned between the positioning pin and the pin guide groove. The pull handle is fixedly connected to the positioning pin and extends to the outside of the pin guide groove. Positioning holes are provided on the rear transition section of the ladder head unit and the rear ladder section of the ladder body unit, and the positioning pin is inserted into the positioning holes.

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