Lightweight passenger seat with foldable backrest

Abstract

The present invention relates to a light passenger seat with a foldable backrest, which comprises a backrest frame and a seat frame assembly, wherein the backrest frame comprises an upper backrest frame and a lower backrest frame, the lower backrest frame is fixed to the inner side wall of the cabin, the seat frame assembly is connected to the middle of the lower backrest frame, and the lower end of the upper backrest frame and the upper end of the lower backrest frame are hinged. The backrest of the light passenger seat with a foldable backrest of the present invention can be folded, and after the seat backrest is partially folded, an emergency window passage is left, so that passengers can escape from the window in an emergency state.

Description

Technical Field

[0001] The invention relates to a seat, in particular to a seat on a helicopter or an armored vehicle. Background Art

[0002] Compared with transport aircraft, helicopters are smaller and have shorter cabins, so generally only two doors are set up in the cabin for passengers to enter and exit. Due to the characteristics of helicopters being maneuverable, flying at low speed and low altitude, and taking off and landing in small areas, emergency landings and crashes are most common. Special situations such as emergency landings and crashes may cause the cabin door to deform, be unable to open, or be blocked, so helicopters are equipped with emergency windows for passengers to escape in an emergency.

[0003] There are many side wall installation forms for passenger seats in helicopter cabins, which have the characteristics of taking up less space and being light in weight (due to the use of side wall mounting interfaces, the force arm is smaller when the seat is loaded forward and laterally, and the structural strength is easy to optimize). However, the backrest of the passenger seat located at the emergency window position often hinders the escape passage from the emergency window. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a lightweight passenger seat with a foldable backrest. The passenger seat needs to have a backrest folding function. When the passenger escapes through the emergency window, the backrest can be folded first to make way for the escape passage, making it easier for the passenger to escape through the emergency window.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A lightweight passenger seat with a foldable backrest comprises a backrest frame and a seat frame assembly, wherein the backrest frame comprises an upper backrest frame and a lower backrest frame, the lower backrest frame is fixed to the inner wall of the cabin, the seat frame assembly is connected to the middle part of the lower backrest frame, and the lower end of the upper backrest frame is hinged to the upper end of the lower backrest frame.

[0007] In the above solution, a backrest folding mechanism is provided at the hinged joint of the upper backrest frame and the lower backrest frame, and the upper backrest frame and the lower backrest frame are hingedly connected via the backrest folding mechanism.

[0008] In the above scheme, the lightweight passenger seat also includes a headrest, which is connected to the top of the backrest frame; the distance from the top of the headrest to the hinge rotation axis of the upper back frame and the lower back frame is greater than the distance from the hinge of the upper back frame and the lower back frame to the seat frame assembly, and is less than the length of the seat frame assembly.

[0009] In the above solution, the lightweight passenger seat also includes a quick-release pin for fixing the lower frame of the backrest.

[0010] In the above scheme, the backrest frame also includes a rotating shaft screw, a first cap nut, a nylon washer, a locking pin, and a second cap nut; the rotating shaft screw and the first cap nut connect the upper backrest frame and the lower backrest frame together; the nylon washer is located between the upper backrest frame and the lower backrest frame; the locking pin is connected to the upper backrest frame and fixed using the second cap nut.

[0011] In the above solution, the lower frame of the backrest is provided with a limiting boss.

[0012] In the above scheme, the folding mechanism includes a transverse tube, a gasket, a hook, a square head screw, a steel gasket, a butterfly spring, a copper gasket, and a third cap nut; the square head screw and the third cap nut connect the hook, three steel gaskets, a butterfly spring, two copper gaskets and the lower frame of the backrest together, and the connection order is square head screw, lower frame of the backrest, steel gasket, butterfly spring, steel gasket, copper gasket, hook, copper gasket, steel gasket, and third cap nut; the transverse tube is connected between the two hooks; the gasket is located between the transverse tube and the hook.

[0013] In the above scheme, the hook portion further includes forming an angle β, the bottom of the angle β is rounded, and the other end is provided with a hook connection hole, and bosses 1 and 2 are provided at relative positions on the outer edge of the hook connection hole.

[0014] In the above solution, the locking pin shaft (104) is provided with a hook ring groove which can limit the left and right swinging of the hook.

[0015] In the above scheme, the angle β is not greater than 80°; when the backrest folding mechanism is in the folded state, an angle α and an angle ε are formed, and the angle ε is between 90° and 91°; the angle α is not greater than 85°.

[0016] The present invention has the following advantages and beneficial effects:

[0017] 1) The backrest of the lightweight passenger seat with a foldable backrest of the present invention can be folded. After the seat backrest is partially folded, an emergency window passage is left, which is convenient for the passenger to escape from the window in an emergency.

[0018] 2) The upper frame of the backrest and the lower frame of the backrest are hinged through a backrest folding mechanism, which facilitates the folding and unfolding of the upper frame of the backrest.

[0019] 3) The distance from the top of the headrest to the hinged rotation axis of the upper frame and the lower frame of the backrest is greater than the distance from the hinge of the upper frame and the lower frame of the backrest to the seat frame assembly, and less than the length of the seat frame assembly. When the upper frame of the backrest falls, the top of the headrest falls on the seat cushion of the seat frame assembly, and the headrest and the upper frame of the backrest form a ladder with a certain slope on the seat cushion, which is convenient for the occupant to escape from the window in an emergency.

[0020] 4) The seat is provided with a quick-release pin for fixing the lower frame of the backrest.

[0021] 5) The lightweight passenger seat of the present invention adopts a rotary locking structure, which can avoid unlocking jamming caused by errors in the cabin interface of the latch-type structure or deformation of the cabin interface after receiving the emergency landing impact load.

[0022] 6) The lightweight passenger seat with a foldable backrest of the present invention adopts a flexible backrest, which can realize the folding of the backrest and the seat surface and effectively reduce the weight of the seat.

[0023] 7) The light passenger seat with foldable backrest of the present invention can be generally used in helicopters and armored vehicles and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a lightweight passenger seat with a foldable backrest according to the present invention;

[0025] Figure 2 It is a schematic diagram of a folded backrest state of a lightweight passenger seat with a foldable backrest according to the present invention;

[0026] Figure 3 is a schematic diagram of a backrest frame of the present invention;

[0027] Figure 4 is an exploded view of the backrest folding mechanism of the present invention;

[0028] Figure 5 This is a diagram of the folding state of the backrest folding mechanism of the present invention;

[0029] Figure 6 It is a schematic diagram of the hook of the present invention;

[0030] Figure 7 is a schematic diagram of the locking pin of the present invention;

[0031] Figure 8 is a schematic diagram of the flexible backrest fabric of the present invention;

[0032] Fig. 9 It is a schematic diagram of the seat surface folding of the present invention.

[0033] In the figure: 1-backrest frame, 2-seat frame assembly, 3-seat cushion, 4-safety belt, 5-backrest cloth, 6-headrest, 7-chair leg lock, 8-quick release pin, 101-spindle screw, 102-first cap nut, 103-nylon gasket, 104-locking pin, 104a-ring groove, 104b-third plane, 104c-thread, 105-second cap nut, 110-backrest folding mechanism, 111-cross tube, 112-gasket, 113-hook, 113a-first boss, 113b-second boss, 113c- Annular boss, 113d-rounded corner, 114-square head screw, 114a-square end face, 115-steel washer, 116-butterfly spring, 117-copper washer, 118-third cap nut, 120-upper frame of backrest, 120a-first plane, 130-lower frame of backrest, 130a-second plane, 130b-limiting boss, 501-ear piece, 502-canvas, 503-load-bearing belt, 504-load-bearing belt, α-angle, ε-angle, β-angle, A-footing point 1, B-footing point 2, C-emergency window DETAILED DESCRIPTION

[0034] The present invention is further described in detail below through specific embodiments:

[0035] like Figure 1 As shown, the embodiment of the light passenger seat with foldable backrest of the present invention comprises a backrest frame 1, a seat frame assembly 2, a seat cushion 3, a safety belt 4, a backrest cloth 5, a headrest 6, a chair leg lock 7, and a quick release pin 8. The seat frame assembly 2 is connected to the middle and lower part of the backrest frame 1; the chair leg lock 7 is connected to the lower part of the backrest frame 1, and is used to connect the seat to the cabin floor.

[0036] The backrest frame 1 includes an upper backrest frame 120 and a lower backrest frame 130. The lower backrest frame 130 is fixed by a chair leg lock 7 and a quick-release pin 8. The upper part of the lower backrest frame 130 is fixed to the inner wall of the cabin by the quick-release pin 8. The quick-release pin 8 can be used for quick connection between the seat and the cabin side wall interface; the seat frame assembly 2 is connected to the middle part of the lower backrest frame 130, and the lower end of the upper backrest frame 120 is hinged to the upper end of the lower backrest frame 130.

[0037] The headrest 6 is connected to the top of the backrest frame 1; the distance from the top of the headrest 6 to the hinged rotation axis of the upper backrest frame and the lower backrest frame is greater than the distance from the hinge of the upper backrest frame and the lower backrest frame to the seat frame assembly, and less than the length of the seat frame assembly. In this way, when the upper backrest frame falls down, the top of the headrest falls on the seat cushion of the seat frame assembly, and the headrest and the upper backrest frame form a ladder with a certain slope on the seat cushion, which is convenient for passengers to escape from the window in an emergency.

[0038] The seat cushion 3 is connected to the seat frame assembly 2; the safety belt 4 is connected to the backrest frame 1 and the seat frame assembly 2; and the backrest cloth 5 is connected between the backrest frame 1 and the seat frame assembly 2.

[0039] like Figure 2 and Figure 3 As shown, the backrest frame 1 includes a rotating shaft screw 101, a first cap nut 102, a nylon washer 103, a locking pin 104, a second cap nut 105, a backrest folding mechanism 110, an upper backrest frame 120, and a lower backrest frame 130. The rotating shaft screw 101 and the first cap nut 102 connect the upper backrest frame 120 and the lower backrest frame 130 together; the nylon washer 103 is located between the upper frame 120 and the lower backrest frame 130 to provide a certain rotation damping force; the locking pin 104 is connected to the upper frame 120 and fixed by the second cap nut 105; the backrest folding mechanism 110 is connected between the upper backrest frame 120 and the lower backrest frame 130 to achieve locking of the backrest in the unfolded state.

[0040] After the upper frame 120 of the backrest is folded, the first plane 120a arranged thereon can form a surface contact with the second plane 130a on the lower frame 130 of the backrest, and the occupant can step on the foot point A on the seat cushion 3 and the foot point B on the upper frame 120 of the backrest to escape from the emergency exit C.

[0041] like Figure 3 As shown, the lower frame 130 of the backrest is provided with a limiting boss 130b, which can prevent the seat surface from turning downward when the seat cushion 3 is stepped on.

[0042] like Figure 4 As shown, the folding mechanism 110 includes a transverse tube 111, a washer 112, a hook 113, a lag screw 114, a steel washer 115, a butterfly spring 116, a copper washer 117, and a third cap nut 118. The lag screw 114 and the third cap nut 118 connect the hook 113, three steel washers 115, the butterfly spring 116, two copper washers 117, and the lower frame 130 of the backrest, and the connection sequence is lag screw 114, lower frame 130 of the backrest, steel washer 115, butterfly spring 116, steel washer 115, copper washer 117, hook 113, copper washer 117, steel washer 115, and the third cap nut 118; the transverse tube 111 is connected between the two hooks 113; and the washer 112 is located between the transverse tube 111 and the hook 113.

[0043] Pressing the transverse tube 111 on the folding mechanism 110 downwards can unlock the folding mechanism 110, and after unlocking, the upper frame 120 of the backrest can be folded; when the emergency exit is not in use, the upper frame 120 of the backrest is unfolded and the transverse tube 111 on the folding mechanism 110 is returned to its original position to complete the locking.

[0044] The maximum elastic force of the butterfly spring 116 is not less than 1300N, and the unlocking and locking operating force of the folding mechanism 110 should be between 30 and 50N.

[0045] like Figure 5 As shown, when the backrest folding mechanism 110 is in the folded state, an angle α and an angle ε are formed. The angle ε should be between 90° and 91°, which is convenient for the hook to be opened and avoids the hook from slipping when the hook is stressed; the angle α should not be greater than 85° to ensure a better force transmission path and avoid the hook 113 from slipping when the hook is stressed.

[0046] like Figure 6 As shown, the hook 113 is provided with a first boss 113a, a second boss 113b, an annular boss 113c, a fillet 113d, and an angle β. The first boss 113a, the second boss 113b cooperate with the copper gasket 117 to provide a stable rotation torque; the fillet 113d plays a transition role and can increase the strength of the hook; the angle β should not be greater than 80° to prevent the hook from slipping.

[0047] like Figure 7 As shown, the locking pin 104 is provided with an annular groove 104a, a third plane 104b, and a thread 104c. The hook annular groove 104a can limit the left and right swing of the hook 113; the third plane 104b is used for wrench tightening during installation; and the thread 104c is used for connection.

[0048] like Figure 8 As shown, the backrest fabric 5 includes ear pieces 501, canvas 502, load-bearing belts 503 and 504. There are four ear pieces 501 for connecting the backrest frame 1 and the seat frame assembly 2; the canvas 502 is used for passengers to lean on and provide comfort; there are two load-bearing belts 503.

[0049] The tensile strength of the load-bearing belt 503 and the load-bearing belt 504 is not less than 10000N.

[0050] like Fig. 9 As shown, the seat frame assembly 2 together with the seat cushion 3 can be folded upward to a vertical state to save the interior space of the cabin.

Claims

1. A lightweight passenger seat with a foldable backrest, comprising a backrest frame and a seat frame assembly, characterized in that: The backrest frame includes an upper backrest frame and a lower backrest frame, the lower backrest frame is fixed to the inner side wall of the cabin, the seat frame assembly is connected to the middle part of the lower backrest frame, the lower end of the upper backrest frame is hinged to the upper end of the lower backrest frame; a backrest folding mechanism is provided at the hinge of the upper backrest frame and the lower backrest frame, and the upper backrest frame and the lower backrest frame are hinged through the backrest folding mechanism; the backrest frame also includes a rotating shaft screw, a first cap nut, a nylon gasket, a locking pin, and a second cap nut; the rotating shaft screw and the first cap nut connect the upper backrest frame and the lower backrest frame together; the nylon gasket is located on the upper backrest frame The locking pin is connected to the upper frame of the backrest and fixed with a second cap nut; the folding mechanism includes a cross tube, a gasket, a hook, a square screw, a steel gasket, a butterfly spring, a copper gasket, and a third cap nut; the square screw and the third cap nut connect the hook, 3 steel gaskets, a butterfly spring, 2 copper gaskets and the lower frame of the backrest, and the connection order is square screw, lower frame of the backrest, steel gasket, butterfly spring, steel gasket, copper gasket, hook, copper gasket, steel gasket, and third cap nut; the cross tube is connected between the two hooks; the gasket is located between the cross tube and the hook.

2. The lightweight passenger seat according to claim 1, characterized in that: It also includes a headrest connected to the top of the backrest frame; the distance from the top of the headrest to the hinged rotation axis of the upper backrest frame and the lower backrest frame is greater than the distance from the hinge of the upper backrest frame and the lower backrest frame to the seat frame assembly, and is less than the length of the seat frame assembly.

3. The lightweight passenger seat according to claim 1, characterized in that: It also includes quick-release pins for securing the lower frame of the backrest.

4. The lightweight passenger seat according to claim 1, characterized in that: The lower frame of the backrest is provided with a limiting boss.

5. The lightweight passenger seat according to claim 1, characterized in that: It also includes a hook portion, the hook portion forms an angle β, the bottom of the angle β is rounded, and the other end is provided with a hook connection hole, and bosses 1 and 2 (113b) are provided at relative positions on the outer edge of the hook connection hole.

6. The lightweight passenger seat according to claim 1, characterized in that: It also comprises a locking pin shaft (104), on which a hook ring groove (104a) capable of limiting the left and right swinging of the hook (113) is provided.

7. The lightweight passenger seat according to claim 5, characterized in that: The angle β is not greater than 80°; when the backrest folding mechanism (110) is in a folded state, an angle α and an angle ε are formed, and the angle ε is between 90° and 91°; the angle α is not greater than 85°.

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