A retractable ladder installed under the cockpit of a certain type of transport aircraft

Abstract

The present invention discloses a telescopic ladder installed at the lower part of a cabin of a certain type of transport aircraft, comprising a support, a telescopic ladder barrel arranged at the bottom of the support, a folding footrest arranged on the ladder barrel, a retracting mechanism arranged on the ladder barrel for retracting the ladder barrel, and a locking mechanism arranged on the ladder barrel; the support comprises an upper connecting plate and a lateral column, the bottom of the upper connecting plate is provided with a suspension point 1 and a connection point 1, and the bottom end of the lateral column is provided with a connection point 2; the ladder barrel comprises a first-level ladder barrel, a second-level ladder barrel, a third-level ladder barrel, and a fourth-level ladder barrel connected in sequence from top to bottom; the locking mechanism comprises a locking pin and a locking tongue, the locking pin is provided on the first-level ladder barrel, the locking tongue is provided on the fourth-level ladder barrel, and the locking pin and the locking tongue are locked in cooperation when the ladder barrel is in the retracted state. The telescopic ladder of the present invention is light in weight and easy to use; the telescopic ladder has a small volume after being retracted, and is convenient for installation under the cabin of this type of transport aircraft.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft telescopic ladders, in particular to a telescopic ladder installed at the lower part of a cabin of a certain type of transport aircraft. Background Art

[0002] A certain type of transport aircraft has a tailwheel landing gear with an 11.5° landing angle, necessitating a dedicated ground-based airstair for pilots to board and disembark. This type of airstair is bulky, heavy, and cannot be carried with the aircraft. This makes it difficult for pilots to board and disembark when landing at an airstrip, which may not be equipped with this type of airstair. Therefore, addressing the shortcomings of existing technologies, a telescopic ladder designed to be installed under the cockpit of a certain type of transport aircraft is necessary. Summary of the Invention

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a telescopic ladder installed at the bottom of the cabin of a certain type of transport aircraft. Ground staff only need to rotate the telescopic ladder out from the inside of the fuselage and extend it, and the pilot can easily get on and off the transport aircraft.

[0004] The technical solution is as follows: A telescopic ladder installed at the lower part of the cabin of a certain type of transport aircraft, comprising a support, a telescopic ladder barrel arranged at the bottom of the support, a folding footrest arranged on the ladder barrel, a folding mechanism arranged on the ladder barrel for folding and unfolding the ladder barrel, and a locking mechanism arranged on the ladder barrel; the support comprises an upper connecting plate and a lateral column, the bottom of the upper connecting plate is provided with a hanging point one and a connection point one, and the bottom end of the lateral column is provided with a connection point two; the ladder barrel comprises a first-level ladder barrel, a second-level ladder barrel, a third-level ladder barrel and a fourth-level ladder barrel connected in sequence from top to bottom; the locking mechanism comprises a locking pin and a lock tongue, the locking pin is provided on the first-level ladder barrel, the lock tongue is provided on the fourth-level ladder barrel, and the locking pin and the lock tongue are locked in cooperation when the ladder barrel is in the retracted state.

[0005] Furthermore, the footrest includes a first-level footrest and a second-level footrest; the first-level footrest includes connecting rod one, connecting rod two, connecting rod three and footrest one, and two connecting rods one, two connecting rods two and three are each provided, and are symmetrical along the left and right sides of the first-level ladder barrel, one end of the connecting rod one is hinged to the support, one end of the connecting rod two is hinged to the other end of the connecting rod one, the other end of the connecting rod two is hinged to the first-level ladder barrel, one end of the connecting rod three is hinged to the first-level ladder barrel, the other end of the connecting rod three is hinged to footrest one, and the footrest one is hinged to the first-level ladder barrel; the connection points of connecting rod two and connecting rod three with the first-level ladder barrel coincide; the second-level footrest includes snap rings respectively arranged at the lower ends of the first-level ladder barrel, the second-level ladder barrel, the third-level ladder barrel and the fourth-level ladder barrel, and footrest two, footrest three, footrest four and footrest five, which are alternately arranged on the snap rings on the left and right and have exactly the same structure.

[0006] Furthermore, the footrest 2 includes a rotating shaft 1, a second spring, a pedal, a rotating shaft 2, a third spring and a side support. The pedal is hinged to the retaining ring through the rotating shaft 1, the second spring is arranged on the rotating shaft 1, the side support and the pedal are hinged to the rotating shaft 2, and the third spring is arranged on the rotating shaft 2.

[0007] Furthermore, the snap ring includes snap ring 1, snap ring 2, snap ring 3 and snap ring 4; one side of the snap ring 1 is provided with two first connecting ear pieces and a second connecting ear piece that are spaced apart from each other; a limiting hole is provided on the side of the snap ring 1 adjacent to the first connecting ear piece, and a second connecting ear piece is provided on the side of the snap ring 1 opposite to the limiting hole; the inner ring of the snap ring 1 is provided with a limiting boss 1; the second connecting ear piece is used to mount the pedal 2; the structures of the snap ring 2 and the snap ring 3 are exactly the same, the snap ring 2 is spliced together by a left snap ring and a right snap ring, and the inner rings of the left and right snap rings are provided with a limiting boss 3;

[0008] One side of the left snap ring is provided with a third connecting ear piece for installing pedal three; one side of the snap ring four is provided with a connection point three for installing pedal five.

[0009] Furthermore, the top of the first-level ladder barrel is provided with a suspension point 2 hinged to the suspension point 1, and the side of the first-level ladder barrel is provided with a connecting boss 1 hinged to the footrest 1 and a connecting boss 2 hinged to the connecting rod 3.

[0010] Furthermore, the four edges of the secondary ladder barrel are respectively provided with guide strips, the top of the secondary ladder barrel is provided with a limiting boss 2 that cooperates with the limiting boss 1, and the bottom of the secondary ladder barrel is provided with a groove for installing a clamping ring 2.

[0011] Furthermore, the retracting and extending mechanism includes a handwheel, a connecting rod four and a connecting rod five; the handwheel includes a wheel disk whose center is rotatably connected to the second connecting ear and a handle arranged at one end of the wheel disk, a screw hole one is provided on the end of the wheel disk symmetrical to the handle, a limiting pin is provided on the wheel disk, and the limiting pin is located on the axis of symmetry between the wheel disk and the handle; one end of the connecting rod four is hinged to the first connecting ear, the other end of the connecting rod four is hinged to the connecting rod five, and the end of the connecting rod five away from the connecting rod four is hinged to the connection point two; a screw hole two is provided on one side of the connecting rod four, which is compatible with the screw hole one; a limiting block plate is provided on the connecting rod four.

[0012] Furthermore, the limiting pin includes a pin seat, a block, a straight pin rod, a fourth spring and a cross bar. The pin seat is arranged on one side of the wheel disc, and a special-shaped through hole is arranged at a position corresponding to the pin seat on the wheel disc. The pin seat is provided with a straight pin rod, and the cross bar is arranged at one end of the straight pin rod. The block is arranged on the straight pin rod. The fourth spring is arranged on the straight pin rod and its two ends are respectively in contact with the block and the pin seat. The straight pin rod and the block are adapted to the special-shaped through hole; the straight pin rod and the limiting hole on the retaining ring are adapted; the block and the cross bar are parallel.

[0013] Furthermore, the locking latch includes a lock seat, a latch rod, a limit plate and a first spring; the lock seat is arranged on one side of the first ladder barrel, the latch rod is slidably connected to the lock seat, the latch rod is provided with a limit plate and a first spring, and the two ends of the first spring are respectively abutted against the limit plate and the lock seat; a notch is provided on the lock seat, the lock tongue cooperates with the notch, and the latch rod is plugged into and cooperated with the through hole on the lock tongue.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The present invention is light in weight and easy to use;

[0016] (2) The present invention has a small volume after shrinkage, and is easy to install under the cabin of this type of transport aircraft;

[0017] (3) The present invention does not require any additional electrical equipment and has a purely mechanical structure, which is simple and reliable;

[0018] (4) The present invention is installed below the cabin floor of this type of transport aircraft, on the left side along the course. The installation of this telescopic ladder requires relatively little structural modification to this type of transport aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 Schematic diagram of the three-dimensional structure of the support of the present invention;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the first-level ladder barrel of the present invention;

[0022] Figure 4 Schematic diagram of the three-dimensional structure of the locking latch of the present invention;

[0023] Figure 5 A schematic diagram of the three-dimensional structure of the locking latch of the present invention from another perspective;

[0024] Figure 6 Schematic diagram of the three-dimensional structure of the clamping ring of the present invention;

[0025] Figure 7This is a schematic diagram of the three-dimensional structure of the second footrest of the present invention;

[0026] Figure 8 This is a schematic diagram of the three-dimensional structure of the second-stage ladder barrel of the present invention;

[0027] Figure 9 This is a schematic diagram of the decomposed structure of the second clasp ring of the present invention;

[0028] Figure 10 Schematic diagram of the three-dimensional structure of the snap ring 4 of the present invention;

[0029] Figure 11 Schematic diagram of the three-dimensional structure of the hand wheel of the present invention;

[0030] Figure 12 This is a schematic structural diagram of the special-shaped via of the present invention;

[0031] Figure 13 Schematic diagram of the three-dimensional structure of the limit latch of the present invention;

[0032] Figure 14 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0033] Figure 15 Schematic diagram of the three-dimensional structure of the present invention in a contracted state;

[0034] Figure 16 It is a three-dimensional structural schematic diagram of the installation position of the present invention.

[0035] Explanation of the accompanying symbols: 1_support, 1001_hanging point one, 1002_connecting point one, 1003_connecting point two, 2_first ladder barrel, 201_hanging point two, 202_connecting boss one, 203_connecting boss two, 3_pedal one, 4_connecting rod one, 5_connecting rod two, 6_connecting rod three, 7_locking pin, 71_lock seat, 72_latch rod, 73_limiting plate, 74_first spring, 8_clamp one, 81_first connecting ear, 82_limiting hole, 83_limiting boss one, 84_second connecting ear, 9_pedal two, 91_rotating shaft one, 92_second spring, 93_pedal, 94_rotating shaft two, 95_third spring, 96_side support, 10_second ladder barrel, 101_guide bar, 102_ Limiting boss two, 103_slot, 11_snapping ring two, 1101_left snap ring, 1102_right snap ring, 1103_third connecting ear, 1104_limiting boss three, 12_pedal three, 13_three-level ladder bucket, 14_snapping ring three, 15_pedal four, 16_fourth-level ladder bucket, 17_snapping ring four, 1701_connecting point three, 18_pedal five, 19_lock tongue, 20_handwheel, 2001_wheel, 2002_handle, 2003_screw hole one, 2004_special-shaped through hole, 21_connecting rod four, 2101_limiting block, 22_connecting rod five, 23_limiting latch, 2301_latch seat, 2302_block, 2303_slotted pin, 2304_fourth spring, 2305_cross bar. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings and examples.

[0037] Example 1

[0038] A telescopic ladder installed at the bottom of a certain type of transport aircraft cabin, such as Figure 1-16 As shown, it includes a support 1, a telescopic ladder barrel arranged at the bottom of the support 1, a foldable footrest arranged on the ladder barrel, a folding mechanism arranged on the ladder barrel for folding the ladder barrel, and a locking mechanism arranged on the ladder barrel; the support 1 includes an upper connecting plate and a lateral column, the bottom of the upper connecting plate is provided with a hanging point 1001 and a connection point 1002, and the bottom end of the lateral column is provided with a connection point 2 1003; the ladder barrel includes a first-level ladder barrel 2, a second-level ladder barrel 10, a third-level ladder barrel 13 and a fourth-level ladder barrel 16 connected in sequence from top to bottom; the locking mechanism includes a locking pin 7 and a lock tongue 19, the locking pin 7 is provided on the first-level ladder barrel 2, the lock tongue 19 is provided on the fourth-level ladder barrel 16, and the locking pin 7 is locked with the lock tongue 19 in the retracted state of the ladder barrel.

[0039] Specific reference Figure 1-2The support 1 is provided with a suspension point 1001 for installing the first-level ladder barrel 2 and a suspension point connection point 1002 of the connecting rod 4, and the lateral column of the support 1 is provided with a connection point 2 1003 of the connecting rod 5 22. The upper connecting plate of the support 1 and the plane of the suspension point 201 on the first-level ladder barrel 2 are at an angle of 11.5°, which is used to supplement the parking angle of the aircraft when it is parked, and ensure that the plane of the suspension point 201 on the first-level ladder barrel 2 is parallel to the horizontal plane. The upper connecting plate of the support 1 is fixed to the aircraft cabin floor by bolts.

[0040] refer to Figure 1 and Figure 7 , the footrest includes a first-level footrest and a second-level footrest; the first-level footrest includes a connecting rod 4, a connecting rod 2 5, a connecting rod 3 6 and a footrest 3, and the connecting rod 4, the connecting rod 2 5 and the connecting rod 3 6 are each provided with two, and are symmetrical along the left and right sides of the first-level ladder barrel 2, one end of the connecting rod 4 is hinged to the support 1, one end of the connecting rod 2 5 is hinged to the other end of the connecting rod 4, the other end of the connecting rod 2 5 is hinged to the first-level ladder barrel 2, and one end of the connecting rod 3 6 is hinged to the first-level ladder barrel 2 The other end of the connecting rod three 6 is hinged to the footrest 3, and the footrest 3 is hinged to the first-level ladder barrel 2; the connection points of the connecting rod two 5 and the connecting rod three 6 with the first-level ladder barrel 2 coincide with each other; the second-level footrest includes a clamping ring respectively arranged at the lower end of the first-level ladder barrel 2, the second-level ladder barrel 10, the third-level ladder barrel 13 and the fourth-level ladder barrel 16, and the footrest two 9, the footrest three 12, the footrest four 15 and the footrest five 18 which are alternately arranged on the clamping ring on the left and right and have exactly the same structure.

[0041] Specific reference Figure 7 The footrest 9 includes a rotating shaft 91, a second spring 92, a pedal 93, a rotating shaft 94, a third spring 95 and a side support 96. The pedal 93 is hinged to the retaining ring through the rotating shaft 91. The second spring 92 is arranged on the rotating shaft 91. The side support 96 and the pedal 93 are hinged to the rotating shaft 94. The third spring 95 is arranged on the rotating shaft 94.

[0042] Specific reference Figure 1 and Figure 15 Footrest 2 (9) is hinged to retaining ring 1 (8) via pivot 1 (91). Second spring 92 forces footrest 2 (9) to tilt downward. Side supports 96 are hinged to pedal 93 via pivot 2 (94). When footrest 2 (9) is tilted upward 90° from its vertical position, side supports 96, acting on third spring 95, tilt downward 90° along with pedal 93, securing footrest 2 (9) at a 90° angle to the telescopic ladder. Footrests 3 (12), 4 (15), and 5 (18) are identical in structure to footrest 2 (9).

[0043] refer to Figure 1The snap ring includes a snap ring 1 8, a snap ring 2 11, a snap ring 3 14 and a snap ring 4 17; one side of the snap ring 1 8 is provided with two first connecting ears 81 and a second connecting ear 84 set at intervals, and a limiting hole 82 is provided on the side of the snap ring 1 8 adjacent to the first connecting ear 81, and a second connecting ear 84 is provided on the side of the snap ring 1 8 opposite to the limiting hole 82, and a limiting boss 1 83 is provided on the inner ring of the snap ring 1 8; the second connecting ear 84 is used to install the pedal 2 9.

[0044] Specific reference Figure 1 and Figure 6 The clamping ring 8 is fixed to the bottom of the first-level ladder barrel 2 by screws, and the left front side of the clamping ring 8 is provided with a first connecting ear 81 for connecting the handwheel 20, and the left side of the clamping ring 8 is also provided with a second connecting ear 84 for connecting with the connecting rod 4 21. The front and rear sides of the clamping ring 8 are provided with a limiting hole 82, and the limiting hole 82 can be locked with the handwheel 20 to lock the handwheel 20. The rear side of the clamping ring 8 is provided with a fourth connecting ear 85 connected to the foot pedal 29. The interior of the clamping ring 8 is also provided with a limiting boss 83 for limiting the extreme position of the second-level ladder barrel 10. The bolt holes on the first connecting ear 81 and the second connecting ear 84 are located on the same axis.

[0045] Specific reference Figure 1 and Figure 9 , the structures of the second snap ring 11 and the third snap ring 14 are exactly the same. The second snap ring 11 is composed of a left snap ring 1101 and a right snap ring 1102, and the inner circles of the left snap ring 1101 and the right snap ring 1102 are provided with a limiting boss three 1104; one side of the left snap ring 1101 is provided with a third connecting ear 1103 for installing the foot pedal three 12; the second snap ring 11 is composed of two left and right parts that are screwed together through the ear pieces above, that is, the left snap ring 1101 and the right snap ring 1102 are relatively spliced together, and a limiting boss three 1104 is provided inside the second snap ring 11 to limit the extreme position of the three-step ladder barrel 13, and the front side of the left snap ring 1101 is provided with a third connecting ear 1103 connected to the foot pedal three 12; the structures of the snap ring 2 and the snap ring 3 are the same and are not repeated here.

[0046] Specific reference Figure 10 The fourth clamp ring 17 is fixed to the four-step ladder barrel 16 by screws, and the front side of the fourth clamp ring 17 is provided with a third connection point 1701 for connecting to the fifth step 18. The locking tongue 19 is fixed to the right side of the fourth clamp ring 17 by screws.

[0047] Specific reference Figure 1 and Figure 3The top of the first-level ladder barrel 2 is provided with a second suspension point 201 hinged to the first suspension point 1001. The side of the first-level ladder barrel 2 is provided with a connecting boss 1 202 hinged to the first step 3 and a connecting boss 203 hinged to the third connecting rod 6. The top of the first-level ladder barrel 2 is provided with two second suspension points 201 for hinged connection to the first suspension point 1001. The front and rear side walls of the first-level ladder barrel 2 are provided with a connecting boss 1 202 and a connecting boss 2 203 connecting the first step 3 to the third connecting rod 6.

[0048] Specific reference Figure 1 and Figure 8 The four edges of the secondary ladder barrel 10 are respectively provided with guide strips 101, the top of the secondary ladder barrel 10 is provided with a limiting boss 2 102 that cooperates with the limiting boss 1 83, and the bottom of the secondary ladder barrel 10 is provided with a card groove 103 for installing the clamping ring 2 11. The second-level ladder barrel 10, the third-level ladder barrel 13, and the fourth-level ladder barrel 16 have similar structures. Each of the four edges of the second-level ladder barrel 10, the third-level ladder barrel 13, and the fourth-level ladder barrel 16 is provided with a guide strip 101. The second-level ladder barrel 10 is clearance-matched with the first-level ladder barrel 2, the third-level ladder barrel 13 is clearance-matched with the second-level ladder barrel 10, and the fourth-level ladder barrel 16 is clearance-matched with the third-level ladder barrel 13. The second-level ladder barrel 10 is used as an example for illustration. A second limiting boss 102 is provided on the top of the second-level ladder barrel 10. When the second-level ladder barrel 10 slides out, the second limiting boss 102 contacts the limiting boss 1 83 of the snap ring 1 8, limiting the second-level ladder barrel 10 to its extreme sliding position. A retaining groove 103 is provided on the bottom of the second-level ladder barrel 10 for mounting the second snap ring 11. The structures of the second-level ladder barrel 10, the third-level ladder barrel 13, and the fourth-level ladder barrel 16 are identical and will not be further described.

[0049] Specific reference Figure 1 、 2 , 6, and Figure 11-15 The retracting and extending mechanism includes a handwheel 20, a connecting rod four 21 and a connecting rod five 22; the handwheel 20 includes a wheel disc 2001 rotatably connected to the second connecting ear piece 84 at the center and a handle 2002 arranged at one end of the wheel disc 2001, and a screw hole 2003 is provided at one end of the wheel disc 2001 that is symmetrical to the handle 2002, and a limiting pin 23 is provided on the wheel disc 2001, and the limiting pin 23 is located on the axis of symmetry between the wheel disc 2001 and the handle 2002; one end of the connecting rod four 21 is hinged to the first connecting ear piece 81, and the other end of the connecting rod four 21 is hinged to the connecting rod five 22, and the end of the connecting rod five 22 away from the connecting rod four 21 is hinged to the connection point two 1003; a screw hole two that is compatible with the screw hole 2003 is provided on one side of the connecting rod four 21; a limiting block 2101 is provided on the connecting rod four 21.

[0050] The wheel disc 2001 is provided with a screw hole 2003 connected to the connecting rod 4 21 and a special-shaped through hole 2004 that cooperates with the limit pin 23. The limit pin 23 includes a pin seat 2301, a stopper 2302, a straight pin rod 2303, a fourth spring 2304 and a cross bar 2305. The cross bar 2305 on the straight pin rod 2303 is parallel to the stopper 2302. When the limit pin 23 is used to limit the hand wheel 20, only the straight pin rod 2303 needs to be moved. The rod 2303 rotates 90 degrees, at this time the block 2302 is parallel to the through hole on the wheel 2001, and the straight pin rod 2303 and the block 2302 pass through the through hole under the action of the fourth spring 2304 and are inserted into the limiting hole 82 of the retaining ring 8, completing the limiting of the hand wheel 20. After the hand wheel 20 is limited, the ladder barrel, the connecting rod four 21 and the hand wheel 20 form a whole and form a stable triangle state with the connecting rod five 22, thereby preventing the ladder barrel from swinging outward.

[0051] The connecting rod four 21 is provided with a limit block 2101 and a screw hole two connected to the handwheel 20. The left end of the connecting rod four 21 is connected to the connecting rod five 22, and the right end of the connecting rod four 21 is connected to the retaining ring 1 8. When the connecting rod four 21 and the connecting rod five 22 move downward at the same time, the connecting rod five 22 will be blocked by the limit block 2101 to form a stable structure with the connecting rod four 21.

[0052] refer to Figure 12-15 The limit latch 23 includes a latch seat 2301, a stopper 2302, a straight pin rod 2303, a fourth spring 2304 and a cross bar 2305. The latch seat 2301 is arranged on one side of the wheel 2001. The wheel 2001 is provided with a special-shaped through hole 2004 at a position corresponding to the latch seat 2301. The latch seat 2301 is provided with a straight pin rod 2303. The cross bar 2305 is provided on the straight pin rod 2 At one end of 303, the stopper 2302 is arranged on the straight pin rod 2303. The fourth spring 2304 is arranged on the straight pin rod 2303 and its two ends are respectively in contact with the stopper 2302 and the pin seat 2301. The straight pin rod 2303 and the stopper 2302 are adapted to the special-shaped through hole 2004; the straight pin rod 2303 and the limiting hole 82 on the retaining ring 8 are adapted; the stopper 2302 and the cross bar 2305 are parallel.

[0053] Specific reference Figure 4-5 and Figure 15The locking latch 7 includes a lock seat 71, a latch rod 72, a limiting plate 73, and a first spring 74. The lock seat 71 is set on one side of the first ladder barrel 2. The latch rod 72 is slidably connected to the lock seat 71. The latch rod 72 is provided with a limiting plate 73 and a first spring 74. The two ends of the first spring 74 respectively abut the limiting plate 73 and the lock seat 71. The lock seat 71 is provided with a notch, and the lock tongue 19 cooperates with the notch. The latch rod 72 plugs and cooperates with the through hole on the lock tongue 19. When the telescopic ladder is retracted, the lock tongue 19 is inserted into the notch on the lock seat 71, and the latch is inserted into the through hole of the lock tongue 19, so that the telescopic ladder is locked at each level. The limiting plate 73 is fixed to the latch so that the latch can be accurately inserted into the through hole on the lock seat 71 during insertion and removal. The first spring 74 acts on the limiting plate 73, which makes the latch have a rebound effect during insertion and removal. The locking latch 7 is fixed to the right side of the first ladder barrel 2 by screws.

[0054] Telescopic ladder opening process:

[0055] Specific reference Figure 15 , the telescopic ladder is in the retracted state, pull out the limit pin 23 and rotate it 90 degrees to prevent the limit pin 23 from rebounding, release the locked state of the telescopic ladder, rotate the hand wheel 20 counterclockwise, and make the ladder barrel start to rotate outward from the state of being deflected 20 degrees inward. At the same time, the footrest 3 follows the ladder barrel and turns upward through the action of the connecting rod 1 4, the connecting rod 2 5, and the connecting rod 3 6. The connecting rod 4 21 is driven by the action of the hand wheel 20 to drive the connecting rod 5 22 to unfold downward until the connecting rod 4 21 and the connecting rod 5 22 reach a stable state, so that the ladder barrel is deflected 20 degrees outward and fixed. At this time, footrest 1 3 also reaches a stable state through the above-mentioned connecting rod mechanism, and the locking pin 7 is pulled out to release the locking state of the ladder barrels at each level, and the second-level ladder barrel 10, the third-level ladder barrel 13 and the fourth-level ladder barrel 16 are pulled outward and reach the limit position. Then, footrest 2 9, footrest 3 12, footrest 4 15 and footrest 5 18 are folded upward 90° from the vertical state. When the side support 96 is at 90° with the pedal 93 through the action of the third spring 95, the footrest and the telescopic ladder are fixed at 90°. At this time, the pilot can get on and off the aircraft using the telescopic ladder.

[0056] The retraction process of the telescopic ladder can be carried out in the reverse order of the opening process. Figure 1 and Figure 16 .

[0057] The present invention has been installed on Y5B and used with good effect.

[0058] Example 2

[0059] This embodiment is similar to embodiment 1 except that

[0060] The structures of the snap ring 1 8, snap ring 2 11, snap ring 3 14 and snap ring 4 17 of this embodiment are exactly the same, and the same structure and specifications of the snap rings are used, which can reduce the production process and save costs on the production end. Therefore, they all adopt a structure composed of a left snap ring 1101 and a right snap ring 1102. The left snap ring 1101 and the right snap ring 1102 can be adjusted by connecting pins during installation, and can be adjusted and installed accordingly according to the radius of the ladder barrel.

[0061] The working principle of this embodiment is basically the same as that of embodiment 1, and will not be described again here.

[0062] Example 3

[0063] This embodiment is similar to embodiment 1 and embodiment 2 except that

[0064] In this embodiment, based on the second embodiment, a footrest is provided on the front and rear sides of the first snap ring 8, the second snap ring 11, the third snap ring 14 and the fourth snap ring 17. When footrests are provided on both sides, the pilot does not need to consider whether to extend the left foot or the right foot first when going up and down the telescopic ladder. There is a footrest under each foot, so the pilot will not step on empty space.

[0065] The working principle of this embodiment is basically the same as that of embodiment 1, and will not be described again here.

[0066] It should be understood that the above description is only for illustrative purposes and is not intended to limit the present invention. Those skilled in the art will appreciate that variations of the present invention will fall within the scope of the claims herein.

[0067] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0068] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention. At present, the technical solution of the present invention has been pilot-tested, that is, a smaller-scale experiment before the product is mass-produced; after the pilot test was completed, a user usage survey was conducted on a small scale, and the survey results showed that user satisfaction was high; now we are starting to prepare for the formal production of the product for industrialization (including intellectual property risk warning surveys).

Claims

1. A telescopic ladder installed at the bottom of a transport aircraft cabin, characterized in that: It comprises a support (1), a telescopic ladder barrel arranged at the bottom of the support (1), a foldable footrest arranged on the ladder barrel, a retractable mechanism arranged on the ladder barrel for retracting the ladder barrel, and a locking mechanism arranged on the ladder barrel; The support (1) comprises an upper connecting plate and a lateral column, wherein a first hanging point (1001) and a first connecting point (1002) are provided at the bottom of the upper connecting plate, and a second connecting point (1003) is provided at the bottom end of the lateral column; The ladder barrel comprises a first-level ladder barrel (2), a second-level ladder barrel (10), a third-level ladder barrel (13) and a fourth-level ladder barrel (16) connected in sequence from top to bottom; The locking mechanism comprises a locking pin (7) and a locking tongue (19), wherein the locking pin (7) is arranged on the first-level ladder barrel (2), and the locking tongue (19) is arranged on the fourth-level ladder barrel (16), and the locking pin (7) and the locking tongue (19) are locked and matched when the ladder barrel is in a retracted state; The pedals include a first-level pedal and a second-level pedal; The first-level footrest comprises a connecting rod 1 (4), a connecting rod 2 (5), a connecting rod 3 (6) and a footrest 1 (3). The connecting rod 1 (4), the connecting rod 2 (5) and the connecting rod 3 (6) are each provided with two, and are symmetrical along the left and right sides of the first-level ladder barrel (2). One end of the connecting rod 1 (4) is hinged to the support (1), one end of the connecting rod 2 (5) is hinged to the other end of the connecting rod 1 (4), the other end of the connecting rod 2 (5) is hinged to the first-level ladder barrel (2), one end of the connecting rod 3 (6) is hinged to the first-level ladder barrel (2), the other end of the connecting rod 3 (6) is hinged to the footrest 1 (3), and the footrest 1 (3) is hinged to the first-level ladder barrel (2); The connection points of the second connecting rod (5) and the third connecting rod (6) coincide with the connection points of the first ladder barrel (2); The secondary footrest comprises a clamping ring respectively arranged at the lower end of the first ladder barrel (2), the second ladder barrel (10), the third ladder barrel (13) and the fourth ladder barrel (16), and a second footrest (9), a third footrest (12), a fourth footrest (15) and a fifth footrest (18) which are alternately arranged on the clamping ring and have the same structure. The snap rings include snap ring one (8), snap ring two (11), snap ring three (14) and snap ring four (17); One side of the snap ring (8) is provided with two first connecting ear pieces (81) and a second connecting ear piece (84) which are spaced apart from each other; a limiting hole (82) is provided on the side of the snap ring (8) adjacent to the first connecting ear piece (81); a second connecting ear piece (84) is provided on the side of the snap ring (8) opposite to the limiting hole (82); and a limiting boss (83) is provided on the inner ring of the snap ring (8); The second connecting ear piece (84) is used for mounting the second pedal (9); The structures of the second snap ring (11) and the third snap ring (14) are identical. The second snap ring (11) is formed by splicing a left snap ring (1101) and a right snap ring (1102). The inner rings of the left snap ring (1101) and the right snap ring (1102) are provided with a limiting boss three (1104). A third connecting lug (1103) for mounting pedal three (12) is provided on one side of the left snap ring (1101); One side of the snap ring 4 (17) is provided with a connection point 3 (1701) for mounting the pedal 5 (18).

2. The telescopic ladder installed at the bottom of the transport aircraft cabin according to claim 1, characterized in that: The pedal (9) comprises a first rotating shaft (91), a second spring (92), a pedal (93), a second rotating shaft (94), a third spring (95) and a side support (96); the pedal (93) is hinged to the snap ring via the first rotating shaft (91); the second spring (92) is arranged on the first rotating shaft (91); the side support (96) and the pedal (93) are hinged to the second rotating shaft (94); and the third spring (95) is arranged on the second rotating shaft (94).

3. The telescopic ladder installed at the bottom of the transport aircraft cabin according to claim 2, characterized in that: The top of the first-level ladder barrel (2) is provided with a second suspension point (201) hinged to the first suspension point (1001), and the side of the first-level ladder barrel (2) is provided with a connecting boss 1 (202) hinged to the first footrest (3) and a connecting boss 2 (203) hinged to the third connecting rod (6).

4. The telescopic ladder installed at the bottom of the transport aircraft cabin according to claim 3, characterized in that: The four edges of the secondary ladder barrel (10) are respectively provided with guide strips (101), the top of the secondary ladder barrel (10) is provided with a second limiting boss (102) that cooperates with the first limiting boss (83), and the bottom of the secondary ladder barrel (10) is provided with a clamping groove (103) for installing the second clamping ring (11).

5. The telescopic ladder installed at the bottom of the transport aircraft cabin according to claim 3, characterized in that: The retractable mechanism comprises a hand wheel (20), a connecting rod four (21) and a connecting rod five (22); The hand wheel (20) comprises a wheel disc (2001) whose center is rotatably connected to the second connecting ear piece (84) and a handle (2002) arranged at one end of the wheel disc (2001); a screw hole (2003) is arranged at one end of the wheel disc (2001) which is symmetrical to the handle (2002); a limit pin (23) is arranged on the wheel disc (2001); and the limit pin (23) is located on the symmetry axis of the screw hole (2003) and the handle (2002); One end of the connecting rod four (21) is hinged to the first connecting ear (81), the other end of the connecting rod four (21) is hinged to the connecting rod five (22), and the end of the connecting rod five (22) away from the connecting rod four (21) is hinged to the second connection point (1003); One side of the connecting rod 4 (21) is provided with a screw hole 2 adapted to the screw hole 1 (2003); A limit stopper (2101) is provided on the connecting rod four (21).

6. The telescopic ladder installed under the cabin of a transport aircraft according to claim 5, characterized in that: The limit latch (23) comprises a latch seat (2301), a stopper (2302), a straight pin rod (2303), a fourth spring (2304) and a cross bar (2305); the latch seat (2301) is arranged on one side of the wheel disc (2001); a special-shaped through hole (2004) is arranged on the wheel disc (2001) at a position corresponding to the latch seat (2301); and a straight pin rod (2303) is arranged on the latch seat (2301). Rod (2303), the cross bar (2305) is arranged at one end of the straight pin rod (2303), the stopper (2302) is arranged on the straight pin rod (2303), the fourth spring (2304) is arranged on the straight pin rod (2303) and its two ends are respectively in contact with the stopper (2302) and the pin seat (2301), and the straight pin rod (2303) and the stopper (2302) are adapted to the special-shaped through hole (2004); The straight pin rod (2303) is adapted to the limiting hole (82) on the first snap ring (8); The stopper (2302) and the crossbar (2305) are parallel.

7. The telescopic ladder installed under the cabin of a transport aircraft according to claim 1, characterized in that: The locking latch (7) comprises a lock seat (71), a latch rod (72), a limiting piece (73) and a first spring (74); the lock seat (71) is arranged on one side of the first ladder barrel (2); the latch rod (72) is slidably connected to the lock seat (71); a limiting piece (73) and a first spring (74) are arranged on the latch rod (72); and two ends of the first spring (74) are respectively in contact with the limiting piece (73) and the lock seat (71); The lock seat (71) is provided with a notch, the lock tongue (19) is matched with the notch, and the latch rod (72) is plug-fitted with the through hole on the lock tongue (19).

Images