Rail sightseeing vehicle seat capable of rapidly changing backrest orientation

Abstract

The rail sightseeing vehicle seat capable of rapidly changing the backrest orientation comprises a base, a seat body, a backrest swing arm and a first locking mechanism, the backrest swing arm comprises a first swing rod assembly and a second swing rod assembly, the first swing rod assembly is arranged on one side of the seat body, and the second swing rod assembly is arranged on the other side of the seat body. The first swing rod assembly comprises a first backrest lower swing rod and a first backrest upper swing rod, one end of the first backrest lower swing rod is hinged to the base, and the other end of the first backrest lower swing rod is connected with the first backrest upper swing rod through a first locking mechanism. The backrest design conforms to the human body curve, the backrest orientation can be rapidly switched, the sightseeing experience is improved, the cost is reduced, the riding comfort is improved, and the sightseeing train is suitable for single-line back-and-forth running.

Description

Technical Field

[0001] The utility model relates to the technical field of sightseeing vehicle seats, in particular to a rail sightseeing vehicle seat capable of rapidly changing the orientation of a backrest. Background Art

[0002] Currently, an increasing number of tourist attractions are installing sightseeing rail train routes. However, factors such as terrain, vegetation protection, and investment have limited the availability of loop and double-track options. Consequently, single-track round-trip rail lines have emerged, often with no way to turn around at either end, forcing trains to travel only in either direction. Consequently, sightseeing trains operating on these routes often face a seat orientation issue: Passengers cannot ensure their seats face the forward direction on both the outbound and return journeys, significantly impacting the tourist experience.

[0003] The seat reversing of high-speed rail carriages adopts the horizontal rotation form, which is relatively expensive and occupies a large space. The seat reversing of rail vehicles used to transport personnel for underground mining is too simple, and only uses a flat backrest to swing back and forth to perform the reversing (such as Figure 1 ), the backrest is in a straight shape, which is inconsistent with the normal spinal curve and sitting habits of the human back, and greatly reduces the riding comfort.

[0004] In view of the above situation, the utility model proposes a rail sightseeing car seat with a fast switching backrest direction, which uses a special locking mechanism to quickly connect the backrest swing arm designed in two sections to form a seat back close to the curve of the human back and can be quickly switched in two directions (such as Figure 2 ). Thus, for a sightseeing train on a single line, whether it is traveling forward on the outbound journey or traveling in reverse on the return journey, it can be ensured that the passengers' seats are always facing the direction of travel. Utility Model Content

[0005] Therefore, one purpose of the present invention is to provide a rail sightseeing car seat with a fast switching backrest direction, so as to solve the problems mentioned in the background technology and overcome the shortcomings of the existing technology.

[0006] In order to achieve the above-mentioned object, the utility model provides a rail sightseeing car seat with a fast switching backrest direction, comprising a base, a seat, a backrest swing arm, and a first locking mechanism, the backrest swing arm comprising a first swing link assembly and a second swing link assembly, the first swing link assembly being provided on one side of the seat, and the second swing link assembly being provided on the other side of the seat, the first swing link assembly comprising a first backrest lower swing link and a first backrest upper swing link, one end of the first backrest lower swing link being hinged to the base, and the other end of the first backrest lower swing link being connected to the first backrest upper swing link via the first locking mechanism;

[0007] The first locking mechanism includes a first connecting shaft, a first follower rod, a first elastic pawl, a first telescopic slider, a first linkage lever group and a first spring, and the first backrest upper swing rod and the first follower rod are respectively fixedly connected to the first connecting shaft;

[0008] The first elastic pawl includes a first elastic sheet and a first upper rigid horizontal bar vertically connected to the first elastic sheet. A first through hole and a first same-shaped hole are provided on the first backrest lower swing rod. The first through hole is provided above the first same-shaped hole, and the first telescopic slider cooperates with the first same-shaped hole. One end of the first telescopic slider is connected to the first spring, and the other end of the first telescopic slider is provided with a serrated groove. One end of the first elastic sheet is fixed above the first through hole, and the other end of the first elastic sheet is against the serrated groove. The first backrest upper swing rod squeezes the first upper rigid horizontal bar to bend and deform the first elastic sheet toward the first through hole to unlock the first telescopic slider, and the first follower rod cooperates with the first linkage lever group to drive the first telescopic slider to telescopically slide.

[0009] Preferably, the first linkage lever group includes a first linkage lever and a second linkage lever, one end of the first linkage lever and one end of the second linkage lever are respectively movably connected to the first telescopic slider, and the other ends of the first linkage lever and the second linkage lever are both hook structures.

[0010] In any of the above schemes, it is preferred that the first telescopic slider is fixed with a first round rod and a second round rod in the vertical direction, one end of the first linkage lever is movably connected to the first telescopic slider through the first round rod, and one end of the second linkage lever is movably connected to the first telescopic slider through the second round rod.

[0011] In any of the above solutions, preferably, the first elastic pawl further includes a first lower rigid horizontal bar, and the first lower rigid horizontal bar is fixedly arranged on one end of the first elastic sheet close to the first telescopic slider.

[0012] In any of the above solutions, preferably, both ends of the first upper rigid horizontal bar are chamfered structures.

[0013] In any of the above solutions, preferably, a first backrest positioning block and a second backrest positioning block are provided on one side of the seat, and the first backrest lower swing rod is located between the first backrest positioning block and the second backrest positioning block.

[0014] In any of the above schemes, it is preferred that the other end of the first backrest lower swing rod is provided with a first limit block and a second limit block, and the first backrest upper swing rod is narrowed near one end of the first backrest lower swing rod to form a thin rod, and the thin rod is located between the first limit block and the second limit block.

[0015] Preferably, in any of the above schemes, it also includes a second locking mechanism, a curved lumbar support and a backrest cross bar, the second rocker arm assembly includes a second backrest upper rocker arm and a second backrest lower rocker arm, the other end of the second backrest lower rocker arm is connected to the second backrest upper rocker arm through a second locking mechanism; a backrest cross bar is provided between the first backrest upper rocker arm and the second backrest upper rocker arm and between the first backrest lower rocker arm and the second backrest lower rocker arm; a curved lumbar support is provided between the first backrest lower rocker arm and the second backrest lower rocker arm.

[0016] In any of the above solutions, preferably, a first circular rotating shaft is provided in the middle of one side of the base, and one end of the first backrest lower swing rod is connected to the base through the first circular rotating shaft.

[0017] In any of the above solutions, preferably, the second locking mechanism has the same structure as the first locking mechanism.

[0018] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0019] 1. The utility model avoids the discomfort caused by the straight backrest in the reversing mode of underground mining rail vehicle seats. Through the movable connection of the two-section backrest rocker and the locking mechanism, the backrest shape is closer to the human back curve, which conforms to the sitting habit and significantly improves the riding comfort.

[0020] 2. Compared with the high cost and complex horizontal rotation form of high-speed rail carriage seats, the seat reversing mechanism design of the present invention is more economical and practical, easy to operate, and takes up little space.

[0021] 3. The utility model effectively solves the problem of the orientation of passenger seats on a single-line round-trip rail sightseeing car, ensuring that the passenger seats are always facing the direction of travel on both the outbound and return journeys. A curved lumbar support and a backrest cross bar are provided between the backrest rocker rods, which can support the human waist, greatly improving the sightseeing experience of tourists while taking into account both economy and comfort.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, which will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 Schematic diagram of the seats in the rail vehicle used to transport personnel for underground mining.

[0025] Figure 2 The figure is a front view of a rail sightseeing vehicle seat with a backrest that can quickly change its orientation according to an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of the connection between the first swing arm assembly and the second swing arm assembly.

[0027] Figure 4 The figure is a front view of a first elastic pawl in a rail sightseeing vehicle seat with a quick change of backrest orientation according to an embodiment of the present utility model.

[0028] Figure 5 for Figure 4 Left view of .

[0029] Figure 6 The present invention is a partial cross-sectional view of the cooperation between the first elastic pawl and the first backrest upper rocker in a rail sightseeing vehicle seat with a rapidly changeable backrest orientation according to an embodiment of the present invention.

[0030] Figure 7 The figure is a schematic structural diagram of a first linkage lever in a rail sightseeing vehicle seat capable of quickly changing the backrest orientation according to an embodiment of the present invention.

[0031] Figure 8 The figure is a schematic structural diagram of a first follower rod in a rail sightseeing vehicle seat capable of rapidly changing the backrest orientation according to an embodiment of the present invention.

[0032] Figure 9 This is a front view of a first telescopic slider in a rail sightseeing vehicle seat that can quickly change the backrest orientation according to an embodiment of the utility model.

[0033] Figure 10 for Figure 9 Top view of .

[0034] Figure 11 This is a schematic diagram of the working process of a rail sightseeing vehicle seat with a quick change of backrest orientation according to an embodiment of the present utility model.

[0035] Figure 12 This is the front view of the first locking mechanism in the A0 state.

[0036] Figure 13 for Figure 12 Left sectional view of .

[0037] Figure 14 This is a top sectional view of the first locking mechanism in the A0 state.

[0038] Figure 15 This is the front view of the first locking mechanism in the A1 state.

[0039] Figure 16 for Figure 15 Left sectional view of .

[0040] Figure 17This is a top sectional view of the first locking mechanism in the A1 state.

[0041] Figure 18 This is the front view of the first locking mechanism in the A2 state.

[0042] Figure 19 for Figure 18 Left sectional view of .

[0043] Figure 20 This is a top sectional view of the first locking mechanism in state A2.

[0044] Figure 21 This is the front view of the first locking mechanism in the A3 state.

[0045] Figure 22 for Figure 21 Left sectional view of .

[0046] Figure 23 This is a top sectional view of the first locking mechanism in the A3 state.

[0047] Figure 24 This is the front view of the first locking mechanism in the A4 state.

[0048] Figure 25 for Figure 24 Left sectional view of .

[0049] Figure 26 It is a top cross-sectional view of the first locking mechanism in the A4 state.

[0050] Among them: 1-base; 2-seat; 3-first backrest lower swing rod; 4-first backrest upper swing rod; 5-first locking mechanism; 6-first connecting shaft; 7-first follower rod; 8-first elastic pawl; 9-first telescopic slider; 10-first spring; 11-first elastic sheet; 12-first upper rigid cross bar; 13-first through hole; 14-first same-shaped hole; 15-first linkage lever; 16-second linkage lever; 17-first round rod; 18-second round rod; 19-first lower rigid cross bar; 20-first backrest positioning block; 21-second backrest positioning block; 22-first limit block; 23-second limit block; 24-second locking mechanism; 25-arc lumbar support; 26-backrest cross bar; 27-second backrest upper swing rod; 28-second backrest lower swing rod; 29-circular rotating shaft; 30-chamfer; 31-thin rod. DETAILED DESCRIPTION

[0051] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0052] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0053] like Figures 2 to 10 As shown, a rail sightseeing car seat with a quickly changeable backrest direction according to an embodiment of the present invention comprises a base 1, a seat 2, a backrest swing arm, a first locking mechanism 5, the backrest swing arm comprising a first swing rod assembly and a second swing rod assembly, one side of the seat 2 is provided with the first swing rod assembly, the other side of the seat 2 is provided with the second swing rod assembly, the first swing rod assembly comprises a first backrest lower swing rod 3 and a first backrest upper swing rod 4, one end of the first backrest lower swing rod 3 is hinged to the base 1, and the other end of the first backrest lower swing rod 3 is connected to the first backrest upper swing rod 4 via the first locking mechanism 5;

[0054] The first locking mechanism 5 includes a first connecting shaft 6, a first follower rod 7, a first elastic pawl 8, a first telescopic slider 9, a first linkage lever 15 group and a first spring 10. The first backrest upper rocker rod 4 and the first follower rod 7 are respectively fixedly connected to the first connecting shaft 6;

[0055] The first elastic pawl 8 includes a first elastic sheet 11 and a first upper rigid cross bar 12 vertically connected to the first elastic sheet 11. A first through hole 13 and a first same-shaped hole 14 are provided on the first backrest lower swing rod 3. The first through hole 13 is provided above the first same-shaped hole 14, and the first telescopic slider 9 cooperates with the first same-shaped hole 14; one end of the first telescopic slider 9 is connected to the first spring 10, and the other end of the first telescopic slider 9 is provided with a serrated groove; one end of the first elastic sheet 11 is fixed above the first through hole 13, and the other end of the first elastic sheet 11 is against the serrated groove; the first backrest upper swing rod 4 squeezes the first upper rigid cross bar 12 to bend and deform the first elastic sheet 11 toward the first through hole 13 to unlock the first telescopic slider 9, and the first follower rod 7 cooperates with the first linkage lever group to drive the first telescopic slider 9 to telescopically slide.

[0056] The seat 2 is concave, and the first spring 10 provides thrust for the first telescopic slider 9. The backrest design of the utility model conforms to the curve of the human body and can quickly switch the backrest direction.

[0057] Further, such as Figure 14 As shown, the first linkage lever 15 group includes a first linkage lever 15 and a second linkage lever 16. One end of the first linkage lever 15 and one end of the second linkage lever 16 are respectively movably connected to the first telescopic slider 9, and the other ends of the first linkage lever 15 and the second linkage lever 16 are both hook structures.

[0058] The other end of the first linkage lever 15 and the other end of the second linkage lever 16 are respectively connected to the first backrest lower swing link 3 through the lever shaft. The first linkage lever 15 and the second linkage lever 16 are a pair of L-shaped levers that can swing around the shaft. The hook structure at the other end of the first linkage lever 15 and the second linkage lever 16 touches the lower end of the first follower rod 7 to produce corresponding action.

[0059] Specifically, the first telescopic slider 9 is fixed with a first round rod 17 and a second round rod 18 in the vertical direction, one end of the first linkage lever 15 is movably connected to the first telescopic slider 9 through the first round rod 17, and one end of the second linkage lever 16 is movably connected to the first telescopic slider 9 through the second round rod 18.

[0060] Further, such as Figures 5 and 6 As shown, the first elastic pawl 8 further includes a first lower rigid cross bar 19 , which is fixed to the other end of the first elastic sheet 11 .

[0061] The first upper rigid cross bar 12 is arranged parallel to the first lower rigid cross bar 19. The first upper rigid cross bar 12 and the first lower rigid cross bar 19 make the first elastic pawl 8 rigid along the length direction of the first upper rigid cross bar 12 and the first lower rigid cross bar 19 and cannot be deformed; while it has elastic characteristics along the direction of the first through hole 13 and can bend and deform to a certain extent when subjected to frontal pressure.

[0062] Specifically, both ends of the first upper rigid cross bar 12 are chamfered 30. The chamfered 30 structure facilitates the first backrest upper rocker 4 to press the first upper rigid cross bar, thereby causing the elastic sheet to deform.

[0063] Specifically, such as Figure 2 As shown, a first backrest positioning block 20 and a second backrest positioning block 21 are provided on one side of the seat 2, with the first backrest lower swing link 3 positioned between the first backrest positioning block 20 and the second backrest positioning block 21. A third backrest positioning block and a fourth backrest positioning block are provided on the other side of the seat 2. The first backrest positioning block 20 and the second backrest positioning block 21 are used to limit the tilt angle of the first backrest lower swing link 3.

[0064] Further, such as Figure 12 As shown, the other end of the first backrest lower swing link 3 is provided with a first limit block 22 and a second limit block 23, and the first backrest upper swing link 4 is narrowed to form a thin rod 31 near one end of the first backrest lower swing link 3.

[0065] The length from the end of the thin rod 31 to the axis of the first connecting shaft 6 forms a lever arm, which is used to form a force arm to fix the first backrest upper swing link 4. The first limit block 22 and the second limit block 23 are symmetrically arranged on the seat and are used to limit the angle between the first backrest upper swing link 4 and the first backrest lower swing link 3.

[0066] Furthermore, a rail sightseeing car seat with a quick change of backrest direction also includes a second locking mechanism 24, a curved lumbar support 25 and a backrest cross bar 26, the second rocker arm assembly includes a second backrest upper rocker arm 27 and a second backrest lower rocker arm 28, the other end of the second backrest lower rocker arm 28 is connected to the second backrest upper rocker arm 27 through the second locking mechanism 24; a backrest cross bar 26 is provided between the first backrest upper rocker arm 4 and the second backrest upper rocker arm 27 and between the first backrest lower rocker arm 3 and the second backrest lower rocker arm 28; a curved lumbar support 25 is provided between the first backrest lower rocker arm 3 and the second backrest lower rocker arm 28.

[0067] The other end of the first spring 10 is embedded in the backrest crossbar. The third and fourth backrest positioning blocks limit the tilt angle of the second backrest lower swing link 28. One end of the second backrest lower swing link 28 is hinged to the base 1. The other end of the second backrest lower swing link 28 is connected to the second backrest upper swing link 27 via a second locking mechanism 24. The other end of the second backrest lower swing link 28 is equipped with a third and fourth stopper. The third and fourth stopper are symmetrically arranged on the seat. The third stopper corresponds to the first stopper 22, and the fourth stopper corresponds to the second stopper 23. The second backrest upper swing link 27 narrows near the end of the second backrest lower swing link 28 to form a thin rod 31, which is located between the third and fourth stopper blocks. The length from the end of the thin rod 31 to the axis of the second connecting shaft forms a lever arm, which forms the moment arm that secures the second backrest upper swing link 27. The third limiting block and the fourth limiting block are used to limit the angle between the second backrest upper swing link 27 and the second backrest lower swing link 28.

[0068] Specifically, such as Figure 2 As shown, a first circular rotating shaft 29 is provided in the middle of one side of the base 1, and one end of the first backrest lower swing link 3 is connected to the base 1 through the first circular rotating shaft 29. A second circular rotating shaft 29 is provided in the middle of the other side of the base 1, and one end of the second backrest lower swing link 28 is connected to the base 1 through the second circular rotating shaft 29.

[0069] Furthermore, the second locking mechanism 24 has the same structure as the first locking mechanism 5 .

[0070] The second locking mechanism 24 includes a second connecting shaft, a second follower rod, a second elastic pawl, a second telescopic slider, a second linkage lever 16 group and a second spring. The second backrest upper rocker rod 27 and the second follower rod are fixedly connected to the second connecting shaft respectively; the second elastic pawl includes a second elastic sheet and a second upper rigid horizontal bar vertically connected to the second elastic sheet. The second backrest lower rocker rod 28 is provided with a second through hole and a second same-shaped hole. The second through hole is provided above the second same-shaped hole, and the second telescopic slider cooperates with the second same-shaped hole; one end of the second telescopic slider is connected to the second spring, and the other end of the second spring is embedded in the backrest horizontal bar. The first spring 10 provides thrust for the first telescopic slider 9. A serrated groove is provided on the other end of the second telescopic slider; one end of the second elastic sheet is fixed above the second through hole, and the other end of the second elastic sheet is against the serrated groove; the second backrest upper rocker rod 27 squeezes the second upper rigid horizontal bar to bend and deform the second elastic sheet toward the second through hole to unlock the second telescopic slider, and the second follower rod cooperates with the second linkage lever 16 group to drive the second telescopic slider to telescopically slide.

[0071] The second linkage lever group 16 includes a third linkage lever and a fourth linkage lever. One end of the third linkage lever and one end of the fourth linkage lever are each movably connected to the second telescopic slider. The other ends of the third linkage lever and the fourth linkage lever each have a hook structure. The other ends of the third linkage lever and the other ends of the fourth linkage lever are respectively rotatably connected to the second backrest lower swing link 28 via a lever shaft. The third and fourth linkage levers are a pair of L-shaped levers that can swing about the shaft. The hook structures at the other ends of the third and fourth linkage levers contact the lower end of the second follower lever to produce corresponding movement.

[0072] The second telescopic slider is fixed with a third round rod and a fourth round rod in the vertical direction. One end of the third linkage lever is movably connected to the second telescopic slider through the third round rod. One end of the fourth linkage lever is movably connected to the second telescopic slider through the fourth round rod.

[0073] The second elastic pawl also includes a second lower rigid bar fixed to the other end of the second elastic sheet. The second upper rigid bar and the second lower rigid bar ensure that the second elastic pawl is horizontally rigid and cannot be deformed, while being vertically elastic and capable of bending and deforming to a certain extent when subjected to direct pressure.

[0074] Both ends of the second upper rigid cross bar are chamfered 30. The chamfered 30 facilitates the second backrest upper swing rod 27 to compress the second upper rigid cross bar, thereby causing the elastic sheet to deform.

[0075] The utility model is a rail sightseeing car seat with a backrest that can quickly change its direction. The working principle is as follows:

[0076] The utility model has five action states when switching directions:

[0077] A0 position: Figures 11 to 14 As shown, the passenger seat orientation shown in this position diagram is assumed to be in the outbound direction (i.e., forward direction) as the initial state. At this point, the first backrest lower swing link 3 of the sightseeing vehicle seat is restrained by the second backrest positioning block 21. The thin rod 31 is located between the second limit block 23 and the first telescopic slider 9. There is also a certain amount of room for movement between the second limit block 23 and the first telescopic slider 9. When a person's back rests against the first backrest swing link assembly, the thin rod 31 abuts against the first telescopic slider 9, which extends through the first concentric hole 14. The other end of the first elastic sheet 11 abuts against the zigzag groove, locking the first locking mechanism 5. At this point, the second linkage lever 16 and the first follower lever 7 are in initial contact. Under the restraining action of the first telescopic slider 9, a stable angle α of less than 180 degrees is formed between the first backrest upper swing link 4 and the first backrest lower swing link 3. At this angle, the positions of the backrest horizontal strips 26 and the arc-shaped waist support 25 together form a backrest shape that is close to the back curve of the human body and the habitual sitting posture.

[0078] A1 action and position: Figure 11 、 Figures 15 to 17 As shown, the first backrest upper rocker 4 is pulled, rotating it counterclockwise through an angle β in the forward direction. At this point, the first follower lever 7 drives the second linkage lever 16 to swing counterclockwise, causing the first telescopic slider 9 to retract into the first congruent hole 14. The first elastic sheet 11 is in an extended state, preventing the first telescopic slider 9 from extending. The first locking mechanism 5 is unlocked, clearing the path for the lever arm at the lower end of the backrest upper rocker. At this point, the first follower lever 7 pushes the other end of the second linkage lever 16, causing it to rotate about its axis, thereby retracting the first telescopic slider 9 into the first congruent hole 14 and preparing for the next action A2.

[0079] A2 action and position: Figure 11 、 Figures 18 to 20 As shown, the first backrest upper swing rod 4 is then rotated clockwise through an angle Δ. At this time, the thin rod 31 swings clockwise and presses on the first upper rigid cross bar 12 of the first elastic pawl 8, causing the first elastic sheet 11 to bend and retract, clearing the position that blocks the first telescopic slider 9. The first telescopic slider 9 is pushed out by the first spring 10, and the other end of the first telescopic slider 9 abuts and maintains contact with the side of the thin rod 31 near the isomorphic hole. At this time, the first locking mechanism 5 is in the unlocked state.

[0080] A3 action and position: Figure 11 、 Figures 21 to 23 As shown, the first backrest lower swing rod 3 is pulled to rotate counterclockwise around the circular rotating shaft 29, so that the first backrest lower swing rod 3 is restricted by the first backrest positioning block 20. At this time, the thin rod 31 is still pressed on the first upper rigid cross bar of the first elastic pawl 8, the first elastic sheet 11 remains in a bent and retracted state, and the other end of the first telescopic slider 9 is in contact with the side of the thin rod 31 close to the isomorphic hole, and the first locking mechanism 5 is in an unlocked state.

[0081] A4 action and position: Figure 11 、 Figures 24 to 26 As shown, the first backrest upper swing link 4 is moved clockwise until the thin rod 31 contacts the first stopper 22. At this point, the thin rod 31 is located between the first stopper 22 and the first telescopic slider 9, with a certain amount of room for movement. The thin rod 31 then moves out of contact with the first telescopic slider 9, which is instantly pushed further outward by the spring to its maximum extension position. Simultaneously, the other end of the first elastic sheet 11 contacts the zigzag groove, locking the first locking mechanism 5. The first telescopic slider 9 restricts the thin rod 31 from swinging in the direction of the slider. At this point, the first backrest upper swing link 4 and the first backrest lower swing link 3 form a stable position, with an angle α less than 180 degrees. At this angle, the positions of the backrest cross bars 26 and the curved lumbar support 25 together form a backrest shape that closely matches the human back curve and the usual sitting posture. This position is effectively a mirror image of the A0 position, i.e., the rearward position, thus completing the entire forward and backward seat orientation switching process for both the outbound and return journeys.

[0082] Compared with the existing technology, the present invention has the following beneficial effects: the backrest design of the present invention conforms to the human body curve, can quickly switch the backrest direction, enhances the sightseeing experience, reduces costs, and improves riding comfort, and is suitable for sightseeing trains that travel back and forth on a single line.

[0083] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0084] Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and should not be construed as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rail sightseeing car seat with a rapidly changing backrest orientation, characterized in that: The invention comprises a base, a seat, a backrest swing arm, and a first locking mechanism, wherein the backrest swing arm comprises a first swing rod assembly and a second swing rod assembly, the first swing rod assembly is provided on one side of the seat, and the second swing rod assembly is provided on the other side of the seat, the first swing rod assembly comprises a first backrest lower swing rod and a first backrest upper swing rod, one end of the first backrest lower swing rod is hinged to the base, and the other end of the first backrest lower swing rod is connected to the first backrest upper swing rod via the first locking mechanism; The first locking mechanism includes a first connecting shaft, a first follower rod, a first elastic pawl, a first telescopic slider, a first linkage lever group and a first spring, and the first backrest upper rocker rod and the first follower rod are respectively fixedly connected to the first connecting shaft; The first elastic pawl includes a first elastic sheet and a first upper rigid horizontal bar perpendicularly connected to the first elastic sheet. The first backrest lower swing rod is provided with a first through hole and a first same-shaped hole. The first through hole is provided above the first same-shaped hole. The first telescopic slider is matched with the first same-shaped hole. One end of the first telescopic slider is connected to the first spring. The other end of the first telescopic slider is provided with a serrated groove. One end of the first elastic sheet is fixed above the first through hole. The other end of the first elastic sheet abuts against the serrated groove. The first backrest upper rocker arm squeezes the first upper rigid horizontal bar to bend and deform the first elastic sheet toward the first through hole to unlock the first telescopic slider, and the first follower rod cooperates with the first linkage lever group to drive the first telescopic slider to telescopically slide.

2. A rail sightseeing car seat with a rapidly changing backrest orientation as claimed in claim 1, characterized in that: The first linkage lever group includes a first linkage lever and a second linkage lever, one end of the first linkage lever and one end of the second linkage lever are respectively movably connected to the first telescopic slider, and the other ends of the first linkage lever and the second linkage lever are both hook structures.

3. A rail sightseeing car seat with a rapidly changing backrest orientation as claimed in claim 2, characterized in that: The first telescopic slider is fixed with a first round rod and a second round rod in the vertical direction, one end of the first linkage lever is movably connected to the first telescopic slider through the first round rod, and one end of the second linkage lever is movably connected to the first telescopic slider through the second round rod.

4. The rail sightseeing car seat with a rapidly changing backrest orientation as claimed in claim 1, characterized in that: The first elastic pawl further includes a first lower rigid cross bar, which is fixed to one end of the first elastic sheet close to the first telescopic slider.

5. The rail sightseeing car seat with a rapidly changing backrest orientation as claimed in claim 1, characterized in that: Both ends of the first upper rigid horizontal bar are chamfered structures.

6. The rail sightseeing vehicle seat with a rapidly changing backrest orientation as claimed in claim 1, characterized in that: A first backrest positioning block and a second backrest positioning block are provided on one side of the seat, and the first backrest lower swing rod is located between the first backrest positioning block and the second backrest positioning block.

7. The rail sightseeing vehicle seat with a rapidly changing backrest orientation as claimed in claim 1, characterized in that: The other end of the first backrest lower swing rod is provided with a first limit block and a second limit block, and the first backrest upper swing rod is narrowed to form a thin rod at one end close to the first backrest lower swing rod, and the thin rod is located between the first limit block and the second limit block.

8. A rail sightseeing vehicle seat with a rapidly changing backrest orientation as claimed in any one of claims 1 to 7, characterized in that: It also includes a second locking mechanism, a curved lumbar support and a backrest cross bar. The second rocker arm assembly includes a second backrest upper rocker arm and a second backrest lower rocker arm. The other end of the second backrest lower rocker arm is connected to the second backrest upper rocker arm through the second locking mechanism. The backrest cross bar is provided between the first backrest upper rocker arm and the second backrest upper rocker arm and between the first backrest lower rocker arm and the second backrest lower rocker arm. The curved lumbar support is provided between the first backrest lower rocker arm and the second backrest lower rocker arm.

9. The rail sightseeing vehicle seat with a rapidly changing backrest orientation as claimed in claim 8, characterized in that: A first circular rotating shaft is provided in the middle of one side of the base, and one end of the first backrest lower swing rod is connected to the base through the first circular rotating shaft.

10. The rail sightseeing vehicle seat with a rapidly changing backrest orientation as claimed in claim 9, characterized in that: The second locking mechanism has the same structure as the first locking mechanism.

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