Door body pedal linkage device and cabin door assembly

Abstract

The invention provides a door body pedal linkage device and a cabin door assembly, the door body pedal linkage device comprises a rotating shaft, the rotating shaft is provided with a door body, and the door body rotates around the rotating shaft to be opened and closed; the eccentric connecting rod is fixed at the lower end of the rotating shaft and is driven by the rotating shaft to rotate; one end of the pull rod is fixed to the end, away from the rotating shaft, of the eccentric connecting rod, and the other end of the pull rod is arranged in a sliding mode in the horizontal direction. One end of the transmission connecting rod is connected with the other end of the pull rod and slides along with the pull rod; the other end of the transmission connecting rod is connected with the pedal mechanism, and the pedal mechanism is driven by the transmission connecting rod to be provided with a use position which is unfolded outwards and a storage position which is folded inwards. Operation consistency of the vehicle door body and the pedal mechanism can be achieved through a simple transmission mechanism, door body opening and pedal using are achieved through pure mechanical structure control, and using reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of linkage door pedal technology, and in particular to a door pedal linkage device and a door assembly. Background Technology

[0002] Existing modes of transportation such as trains, high-speed trains, and airplanes are equipped with step devices to connect the ground and the carriage, assisting passengers in getting on and off the vehicle safely and conveniently.

[0003] One existing pedal device is a standalone structure, requiring manual placement and retraction by crew members. This is cumbersome, increases the workload of crew members, and, when placed alone, is prone to movement under external force, exhibiting poor stability and posing certain safety risks. Another type of pedal device is electrically driven, but cannot be linked to the doors, resulting in high configuration costs and low efficiency.

[0004] To improve ease of use, some manufacturers offer pedal systems that extend or retract automatically when the door opens, saving passengers time. These systems are linked to the door, extending automatically when the door opens and retracting automatically when the door closes, effectively improving pedal efficiency and optimizing the user experience. However, these linked door pedal systems are often complex, and the door itself relies on electric drive. Power outages or electronic system malfunctions can affect the use of the door and pedals, reducing reliability. Summary of the Invention

[0005] This invention provides a door pedal linkage device and a door assembly to solve the problems of existing pedal devices that cannot be used in conjunction with the vehicle door, or even if they can be used in conjunction, they have complex structures and low reliability. This invention achieves consistent operation between the vehicle door and the pedal mechanism through a simple transmission mechanism, and realizes door opening and pedal use through a purely mechanical structure control, thereby improving reliability.

[0006] This invention provides a door pedal linkage device, comprising: A pivot, on which a door body is mounted, the door body rotating around the pivot to open and close; An eccentric connecting rod is fixed to the lower end of the rotating shaft and is driven to rotate by the rotating shaft; A pull rod, one end of which is fixed to the end of the eccentric connecting rod away from the rotating shaft, and the other end of which is slidably disposed in the horizontal direction; A transmission link, one end of which is connected to the other end of the pull rod and slides with the pull rod; The pedal mechanism has an outward-expanding use position and an inward-retracting storage position, driven by the transmission link.

[0007] According to a door pedal linkage device provided by the present invention, the pedal mechanism includes a first frame arranged laterally and a second frame arranged longitudinally connected to the first frame; The transmission linkage includes a first link, a second link, and a third link. One end of the first link is connected to the other end of the pull rod. The other end of the first link is hinged to the connection between the second link and the third link. The other end of the second link is hinged to the first frame, and the other end of the third link is hinged to the second frame.

[0008] According to a door pedal linkage device provided by the present invention, the pedal mechanism is locked when the other ends of the first link, the second link, and the third link are collinear.

[0009] According to the present invention, a door pedal linkage device is provided, wherein there are two of each of the second link and the third link, and a first shaft is provided at the connection between the second link and the third link. The other end of the first link is hinged to the first shaft and located between the two second links and the two third links.

[0010] According to the present invention, a door pedal linkage device further includes a driven link disposed on the opposite side of the transmission link, one end of the driven link being connected to the pedal of the pedal mechanism, and the other end of the driven link being hinged to the first frame.

[0011] According to the present invention, a door pedal linkage device is provided, wherein the pedal includes a first-stage pedal and a second-stage pedal disposed below the first-stage pedal, a first lug is provided on the rear side of the first-stage pedal, and one end of the driven link is hinged to the first lug.

[0012] According to a door pedal linkage device provided by the present invention, a linkage assembly is provided between the first-stage pedal and the second-stage pedal. When the transmission linkage drives the second frame to rotate, the driven linkage drives the first-stage pedal, and the linkage assembly drives the second-stage pedal to expand outward or retract inward.

[0013] According to a door pedal linkage device provided by the present invention, the first frame is provided with a horizontally extending slide groove, and the other end of the pull rod slides along the slide groove.

[0014] According to a door pedal linkage device provided by the present invention, the other end of the pull rod is provided with a joint bearing and a sliding part connected to the joint bearing, and the end of the sliding part away from the joint bearing passes through the sliding groove and is connected to one end of the transmission link.

[0015] The present invention also provides a hatch assembly, including the door pedal linkage device as described above.

[0016] The door and pedal linkage device and door assembly provided by this invention drive the door to rotate, which in turn drives the pull rod to slide. The pull rod drives the transmission link, which in turn drives the pedal mechanism to move, thus realizing the linkage control between the door and the pedal mechanism. When the door is open, the pedal mechanism extends outward to form a position for passengers to get on and off the vehicle. When the door is closed, the pedal mechanism retracts inward to return to the storage position, avoiding the occupation of external space. The structure is simple and easy to use, and it can achieve convenient and efficient use of the pedal mechanism at low cost.

[0017] The door and pedal linkage device of this invention can trigger the door to move its related structures simply by pushing or pulling the door, eliminating the need for keys, buttons, etc. This improves the opening efficiency of the door and pedal mechanism, which is beneficial for scenarios requiring rapid passage. The device contains no complex electronic components; its core parts are all mechanical structures. This reduces malfunctions caused by power outages, circuit aging, chip failures, or software vulnerabilities, improving reliability and reducing maintenance costs, thus extending the device's lifespan. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the door pedal linkage device provided by the present invention, wherein the door is in the closed state and the pedal mechanism is in the storage position.

[0020] Figure 2 yes Figure 1 A side view of the door pedal linkage device.

[0021] Figure 3 yes Figure 1 The diagram shows the door in the open state and the pedal mechanism in the use position of the door pedal linkage device.

[0022] Figure 4 yes Figure 3 A side view of the door pedal linkage device.

[0023] Figure label: 10. Rotating shaft; 11. Door body; 12. Eccentric connecting rod; 13. Pull rod; 131. Spherical bearing; 132. Sliding part; 14. Transmission connecting rod; 141. First connecting rod; 142. Second connecting rod; 143. Third connecting rod; 144. First shaft; 15. Pedal mechanism; 151. First frame; 152. Second frame; 153. First stage pedal; 154. Second stage pedal; 155. First lug; 156. Connecting rod assembly; 157. Second lug; 158. Third lug; 16. Driven connecting rod; 17. Slide groove; 18. Connecting piece; 181. Bushing. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] In the description of this invention, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0028] like Figures 1 to 4 As shown, the present invention provides a door pedal linkage device, comprising: A pivot 10 is provided, on which a door body 11 is mounted. The door body 11 rotates around the pivot 10 to open and close. Specifically, the door body 11 is mounted on the pivot 10 via a connector 18. One end of the connector 18 is fixed to the door body 11, and the other end is sleeved on the pivot 10 via a bushing 181. The pivot 10 is fixed to the door frame structure. By applying a force to the door body 11, the door body 11 and the pivot 10 rotate synchronously, providing power for the pedal mechanism 15 to operate.

[0029] An eccentric connecting rod 12 is fixed to the lower end of the rotating shaft 10 and is driven to rotate by the rotating shaft 10; A pull rod 13 is provided, with one end of the pull rod 13 fixed to the end of the eccentric connecting rod 12 away from the rotating shaft 10, and the other end of the pull rod 13 sliding in the horizontal direction. The eccentric connecting rod 12 is rotated by the rotation of the door body 11. The eccentric design of the eccentric connecting rod 12 can generate radial displacement when it rotates, thereby converting the rotational motion into a linear pushing and pulling force, thus enabling the pull rod 13 to slide.

[0030] A transmission link 14, one end of which is connected to the other end of the pull rod 13 and slides with the pull rod 13; The pedal mechanism 15 is connected to the other end of the transmission link 14. Driven by the transmission link 14, the pedal mechanism 15 has an outward-extending use position and an inward-retracting storage position. The transmission link 14 receives the thrust of the pull rod 13. Through the linkage of the transmission link 14 on the concentric shaft, linear motion is converted into rotation or oscillation of the pedal in the pedal mechanism 15, achieving linkage control.

[0031] In a preferred embodiment of this application, the pedal mechanism 15 includes a first frame 151 arranged laterally and a second frame 152 arranged longitudinally connected to the first frame 151. The transmission link 14 includes a first link 141, a second link 142, and a third link 143. One end of the first link 141 is connected to the other end of the pull rod 13. The other end of the first link 141 is hinged to the connection between the second link 142 and the third link 143. The other end of the second link 142 is hinged to the first frame 151, and the other end of the third link 143 is hinged to the second frame 152.

[0032] like Figure 2 As shown, the transmission link 14 adopts a three-bar linkage mechanism. The three-bar linkage mechanism is connected by a concentric shaft. The concentric shaft ensures the synchronicity and stability of the movement of the three links, avoiding jamming caused by uneven force. This synchronicity is the key to achieving smooth pedal linkage. Therefore, the linkage of the three-bar linkage on the concentric shaft can reduce mechanical resistance and improve the reliability of the mechanism. The first link 141 is located between the second link 142 and the third link 143, and is used to transmit power to the second link 142 and the third link 143.

[0033] The second frame 152 not only provides installation for the relevant structures but also includes a pedal. The second frame 152 is a movable part, capable of rotating to... Figure 3 or Figure 4 Usage location and Figure 1 or Figure 2 In the storage position, when in use, the second frame 152 extends outward at an angle so that its far end is close to the ground and extends outward to facilitate passengers getting on and off the vehicle via the step; when in the storage position, the second frame 152 extends vertically with its bottom suspended in the air to avoid interfering with the movement of the vehicle.

[0034] The existing pedal mechanism does not have a self-locking function, and the pedal is easy to flip over, which affects the passenger's normal stepping. Moreover, if the passenger does not step firmly, they may be bumped or tripped, which poses a certain safety hazard.

[0035] To address the aforementioned issues, the pedal mechanism 15 of this application can achieve automatic locking upon positioning, thereby improving safety and reliability. In some embodiments, such as Figure 4 As shown, when the other end of the first link 141, the other end of the second link 142, and the other end of the third link 143 are collinear, the pedal mechanism 15 is locked.

[0036] When the second link 142 and the third link 143 move to the point where they are collinear, the three-bar linkage has zero degrees of freedom, and external forces cannot drive the three-bar linkage to move, thus achieving self-locking. This ensures that the pedal is locked in a horizontally extended state, preventing the pedal from flipping arbitrarily and causing safety issues.

[0037] The pedal mechanism 15 of this application has a self-locking function. When the pedal reaches the preset position, the pull rod 13 pushes the transmission link 14, making the three points of the first link 141, the second link 142, and the third link 143 collinear, thereby rigidly locking the pedal and preventing it from moving due to external forces (such as gravity or accidental touch). When the passenger continuously presses the pedal, the pedal is subjected to downward pressure, which in turn strengthens the collinearity of the three points of the three links, thus enhancing the self-locking stability of the pedal.

[0038] The pedal mechanism 15 employs a purely mechanical self-locking function that requires no power. Even in the event of a power outage, electronic system malfunction, or external damage (such as a cut wire), it maintains its locked state through physical locking, avoiding the risk of traditional electronic locks being easily unlocked. With the self-locking function of the pedal mechanism 15, internal personnel cannot unlock the door by force (the structural dead-point design converts the stepping force into locking force). If external personnel have not completed the unlocking process, the pedal cannot reset, and the door remains locked, preventing accidental operation or malicious tailgating. Through contactless control, staff only need to push or pull the door 11 to trigger its opening, pedal extension, and self-locking, eliminating the need for keys, buttons, etc., making it particularly suitable for rapid passage scenarios (such as emergency evacuations). Its simple structure allows it to adapt to complex environments, and because it does not rely on complex electronic structures, it reduces the failure rate and extends its service life.

[0039] In some embodiments, there are two of each of the second link 142 and the third link 143. A first shaft portion 144 is provided at the connection between the second link 142 and the third link 143. The other end of the first link 141 is hinged to the first shaft portion 144 and located between the two second links 142 and the two third links 143.

[0040] like Figure 3 As shown, by setting two second links 142 and a third link 143, the structural strength of the transmission link 14 can be improved, preventing deformation or breakage of the second links 142 and the third link 143 under frequent movement, ensuring that the third link 143 stably transmits power to the pedal mechanism 15, and realizing smooth pedal linkage.

[0041] like Figure 3 As shown, the first frame 151 is provided with a second lug 157, and two second connecting rods 142 are hinged to the second lug 157 through a second shaft; the second frame 152 is provided with a third lug 158, and two third connecting rods 143 are hinged to the third lug 158 through a third shaft.

[0042] In some embodiments, the door 11 pedal linkage device further includes a driven link 16 disposed on the opposite side of the transmission link 14. One end of the driven link 16 is connected to the pedal of the pedal mechanism 15, and the other end of the driven link 16 is hinged to the first frame 151.

[0043] like Figure 4 As shown, by setting the driven link 16, the pedal can be extended outward or retracted inward, realizing the linkage of the pedal. In addition, the transmission link 14 is located on one side of the second frame 152 along the length of the pedal. By setting the driven link 16 on the other side of the second frame 152 along the length of the pedal, the pedal mechanism 15 can be evenly stressed along the length of the pedal when in use, ensuring that the pedal is stably kept in a horizontal state and avoiding a situation where one side is higher than the other, so that passengers can step on it with confidence and safety.

[0044] Furthermore, the pedal includes a first-stage pedal 153 and a second-stage pedal 154 disposed below the first-stage pedal 153. A first lug 155 protrudes from the rear side of the first-stage pedal 153, and one end of the driven link 16 is hinged to the first lug 155.

[0045] This embodiment takes the setting of two pedals as an example for explanation. By connecting one end of the driven link 16 to the first-stage pedal 153, when the transmission link 14 drives the second frame 152 to rotate, the driven link 16 can be moved synchronously, thereby driving the first-stage pedal 153 to flip.

[0046] Furthermore, a linkage assembly 156 is provided between the first-stage pedal 153 and the second-stage pedal 154. When the transmission linkage 14 drives the second frame 152 to rotate, the driven linkage 16 drives the first-stage pedal 153, and the linkage assembly 156 drives the second-stage pedal 154 to extend outward or retract inward.

[0047] When the driven link 16 drives the first-stage pedal 153 to flip, the first-stage pedal 153 can simultaneously drive the second-stage pedal 154 to flip via the link assembly 156, thereby enabling the double pedals to extend outward or retract inward, ensuring reliable operation. The link assembly 156 is, for example, a four-bar linkage. Utilizing the "linkage curve" characteristics of the four-bar linkage, the movement trajectory of the pedals can be precisely controlled (such as smooth take-off and landing or tilting at a specific angle).

[0048] Preferably, the third link 143 is connected to the second frame 152 at a position near the middle along the height direction, so as to provide a uniform force to the second frame 152 as a whole, so that the second frame 152 can rotate smoothly. The driven link 16 is also located near the middle of the second frame 152 at one end, so that the driven link 16 and the transmission link 14 can jointly provide balanced and stable support for the pedal mechanism 15, ensuring that the pedal is stably maintained in a horizontally extended use state.

[0049] In a preferred embodiment of this application, the first frame 151 is provided with a horizontally extending groove 17, and the other end of the pull rod 13 slides along the groove 17.

[0050] like Figures 1 to 4 As shown, by setting the slide groove 17, the range of motion of the pull rod 13 can be limited, and the pull rod 13 can be guided to slide in the horizontal direction to ensure accurate power transmission.

[0051] Furthermore, the other end of the pull rod 13 is provided with a joint bearing 131 and a sliding part 132 connected to the joint bearing 131. The end of the sliding part 132 away from the joint bearing 131 passes through the slide groove 17 and is connected to one end of the transmission connecting rod 14.

[0052] like Figure 1 or Figure 3 As shown, by setting a spherical bearing 131, which has a receiving cavity, one end of the sliding part 132 facing the spherical bearing 131 is disposed in the receiving cavity. The sliding part 132 can adaptively cooperate with the receiving cavity. The spherical bearing 131 has universal characteristics, allowing the pull rod 13 to swing within a certain angle range to adapt to the slight positional deviation that occurs during the opening and closing of the door 11, ensuring the continuity of power transmission. During the pedal linkage process, the movement direction of the door 11 and the pedal may have a non-linear relationship. The spherical bearing 131, through its spherical contact structure, can flexibly convert linear or rotational motion into the complex motion trajectory required by the pedal. At the moment of pedal self-locking or unlocking, instantaneous impact force may be generated. The flexible connection of the spherical bearing 131 can buffer the impact and prevent the mechanism from jamming or being damaged. The cooperation between the spherical bearing 131 and the sliding part 132 can reduce mechanical wear and extend the service life of the bearing and linkage mechanism. In addition, the swing angle of the spherical bearing 131 and the length of the slide groove 17 work together to precisely limit the range of movement of the lever 13, ensuring that the pedal stops at a preset position (such as fully open or closed) and avoiding excessive overturning.

[0053] The door pedal linkage device of the present invention differs from the existing structure in that the door 11 does not need to be controlled by an electric drive structure to open and close. It can be pushed and pulled by the staff, which is simple to operate and does not require the use of keys, buttons, etc. It can improve the opening efficiency of the door 11 and the pedal mechanism 15, which is beneficial for scenarios that require rapid passage.

[0054] The door pedal linkage device of the present invention can be applied to transportation vehicles such as trains, high-speed trains, and airplanes. Of course, it can also be applied to common daily transportation vehicles such as buses and subways in the future to provide users with convenient travel and improve user experience.

[0055] The door and pedal linkage device provided by the present invention enables the door 11 to rotate, thereby driving the pull rod 13 to slide. The pull rod 13 drives the transmission link 14, which in turn drives the pedal mechanism 15 to move, thus realizing the linkage control between the door 11 and the pedal mechanism 15. When the door 11 is open, the pedal mechanism 15 unfolds outward to form a position for passengers to get on and off the vehicle. When the door 11 is closed, the pedal mechanism 15 retracts inward to return to the storage position, avoiding the occupation of external space. The structure is simple and easy to use, and it can achieve convenient and efficient use of the pedal mechanism 15 at low cost.

[0056] This device can be triggered by a worker pushing or pulling the door 11, which in turn activates the relevant structural mechanisms. No keys or buttons are required, improving the opening efficiency of the door 11 and the pedal mechanism 15, which is beneficial for scenarios requiring rapid passage. The device contains no complex electronic components; its core parts are all mechanical structures. This reduces malfunctions caused by power outages, circuit aging, chip failures, or software vulnerabilities, improving reliability and reducing maintenance costs, thus extending the device's lifespan. Structural components can be made of corrosion-resistant materials such as stainless steel and alloys, allowing for stable operation in harsh environments such as high humidity, dust, and high temperatures, resulting in a long service life.

[0057] The present invention also provides a door assembly, including the door pedal linkage device of the above embodiments, which can be applied to transportation vehicles such as trains, high-speed trains, airplanes, buses, and subways.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A door threshold linkage comprising: It comprises: a rotating shaft (10) on which a door body (11) is installed, the door body (11) rotates around the rotating shaft (10) to open and close; an eccentric connecting rod (12) fixed to the lower end of the rotating shaft (10) and driven to rotate by the rotating shaft (10); a pull rod (13) one end of which is fixed to the end of the eccentric connecting rod (12) away from the rotating shaft (10), and the other end of which is arranged to slide in the horizontal direction; a transmission connecting rod (14) one end of which is connected to the other end of the pull rod (13) and slides with the pull rod (13); a pedal mechanism (15) connected to the other end of the transmission connecting rod (14), the pedal mechanism (15) has an outwardly expanded use position and an inwardly retracted storage position under the drive of the transmission connecting rod (14).

2. The door pedal linkage device according to claim 1, wherein the pedal mechanism (15) comprises a first frame (151) arranged transversely and a second frame (152) arranged longitudinally connected with the first frame (151); the transmission connecting rod (14) comprises a first connecting rod (141), a second connecting rod (142) and a third connecting rod (143), one end of the first connecting rod (141) is connected to the other end of the pull rod (13), the other end of the first connecting rod (141) is hinged to the connection of the second connecting rod (142) and the third connecting rod (143), the other end of the second connecting rod (142) is hinged to the first frame (151), and the other end of the third connecting rod (143) is hinged to the second frame (152).

3. The door pedal linkage device according to claim 2, wherein when the other end of the first connecting rod (141), the other end of the second connecting rod (142) and the other end of the third connecting rod (143) are collinear, the pedal mechanism (15) is locked.

4. The door pedal linkage device according to claim 2, wherein the second connecting rod (142) and the third connecting rod (143) are both provided with two, the connection of the second connecting rod (142) and the third connecting rod (143) is provided with a first shaft part (144), the other end of the first connecting rod (141) is hinged to the first shaft part (144) and located between the two second connecting rods (142) and the two third connecting rods (143).

5. The door step linkage assembly of claim 2, wherein, It further comprises: a driven connecting rod (16) arranged on the opposite side of the transmission connecting rod (14), one end of the driven connecting rod (16) is connected to the pedal of the pedal mechanism (15), and the other end of the driven connecting rod (16) is hinged to the first frame (151).

6. The door pedal linkage device according to claim 5, wherein The pedal comprises a first stage pedal (153) and a second stage pedal (154) arranged below the first stage pedal (153), a first lug (155) is arranged on the rear side of the first stage pedal (153), and one end of the driven link (16) is hinged to the first lug (155).

7. The door pedal linkage device according to claim 6, characterized in that, A link assembly (156) is arranged between the first stage pedal (153) and the second stage pedal (154), when the driving link (14) drives the second frame (152) to rotate, the driven link (16) drives the first stage pedal (153), and the link assembly (156) drives the second stage pedal (154) to expand outward or retract inward.

8. The door pedal linkage device according to any one of claims 2-7, characterized in that, The first frame (151) is provided with a horizontally extending sliding groove (17), and the other end of the pull rod (13) slides along the sliding groove (17).

9. The door pedal linkage device according to claim 8, characterized in that, The other end of the pull rod (13) is provided with a joint bearing (131) and a sliding part (132) connected with the joint bearing (131), and the end of the sliding part (132) away from the joint bearing (131) penetrates through the sliding groove (17) and is connected with one end of the driving link (14).

10. A hatch door assembly characterized by, The door pedal linkage device according to any one of claims 1-9.

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