Four-way pneumatic leg rest mechanism and control method, seat

Abstract

The present application belongs to the technical field of seat leg rest, and particularly relates to a four-direction pneumatic leg rest mechanism, a control method and a seat. The four-direction pneumatic leg rest mechanism comprises a main support plate, a main mounting plate, a main lifting air bag group, a vice support plate, a vice mounting plate and a vice lifting air bag group. One side of the main support plate is hinged to the main mounting plate. The main lifting air bag group comprises at least two layers of main lifting air bags, and the two layers of main lifting air bags are stacked between the main support plate and the main mounting plate. The vice mounting plate is fixed to the other side of the main support plate, and one side of the vice support plate is hinged to the vice mounting plate. The vice lifting air bag group comprises at least two layers of vice lifting air bags, and the two layers of vice lifting air bags are stacked between the vice mounting plate and the vice support plate. The length of the main support plate is greater than the length of the main mounting plate. When the main lifting air bag group and the vice lifting air bag group are completely deflated, the vice support plate and the vice mounting plate are turned over to below the main mounting plate. The four-direction pneumatic leg rest mechanism has high lifting efficiency, high comfort, large support length and small storage space.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of seat leg rest, and particularly relates to a four-direction pneumatic leg rest mechanism and a control method and a seat. BACKGROUND

[0002] Part of vehicle seats are provided with a leg rest mechanism, which can overturn the leg rest to expand the length of the seat cushion, provide support for the legs of the passenger, and alleviate leg fatigue.

[0003] However, the existing leg rest mechanism drives the leg rest to overturn through an electrically driven linkage mechanism, has low leg rest lifting efficiency, and has a hard overall structure of the leg rest mechanism, which is limited in leg supporting comfort; moreover, the length of the leg rest is small, which is difficult to meet the use requirement, and if a long leg rest is arranged, the leg rest mechanism occupies a large storage space under the seat when the leg rest is in the storage state.

[0004] It can be seen that the existing leg rest mechanism cannot simultaneously have high lifting efficiency, high comfort, large support length and small storage space. SUMMARY

[0005] The application aims to solve the problem that the existing leg rest mechanism cannot simultaneously have high lifting efficiency, high comfort, large support length and small storage space.

[0006] To solve the above technical problem, on one hand, the application provides a four-direction pneumatic leg rest mechanism, which comprises a main support plate, a main mounting plate, a main lifting air bag group, a vice support plate, a vice mounting plate and a vice lifting air bag group.

[0007] The main lifting air bag group comprises at least two layers of main lifting air bags, the two layers of main lifting air bags are arranged in layers between the main support plate and the main mounting plate, and the main lifting air bags are inflated and expanded to push the main support plate to overturn outward relative to the main mounting plate.

[0008] The vice mounting plate is fixed to the other side of the main support plate, one side of the vice support plate is hinged to the vice mounting plate, the vice lifting air bag group comprises at least two layers of vice lifting air bags, the two layers of vice lifting air bags are arranged in layers between the vice mounting plate and the vice support plate, and the vice lifting air bags are inflated and expanded to push the vice support plate to overturn outward relative to the vice mounting plate.

[0009] The length of the main support plate is greater than the length of the main mounting plate, and when the main lifting air bag group and the vice lifting air bag group are completely deflated, the vice support plate and the vice mounting plate are turned to below the main mounting plate.

[0010] Optionally, the rigidity of the main lifting air bag group is greater than the rigidity of the auxiliary lifting air bag group when the turning angle of the main support plate relative to the main mounting plate is the same as the turning angle of the auxiliary support plate relative to the auxiliary mounting plate.

[0011] Optionally, the number of layers of the main lifting air bag of the main lifting air bag group is greater than the number of layers of the auxiliary lifting air bag of the auxiliary lifting air bag group.

[0012] Optionally, the auxiliary mounting plate is arranged perpendicularly to the main support plate.

[0013] Optionally, the length of the main support plate is the same as the length of the auxiliary support plate.

[0014] Optionally, the main lifting air bag group and the auxiliary lifting air bag group are inflated through different air paths.

[0015] Optionally, the four-way pneumatic leg support mechanism further comprises a tension spring, one end of the tension spring is connected to the main support plate, and the other end of the tension spring is connected to the main mounting plate; when the main lifting air bag group is inflated and expanded, the main support plate overcomes the tension of the tension spring and turns outward.

[0016] Optionally, the four-way pneumatic leg support mechanism further comprises a first torsion spring, one side of the main support plate is rotationally connected to the main mounting plate through a first rotating shaft, the first torsion spring is sleeved on the first rotating shaft, one end of the first torsion spring is connected to the main support plate, and the other end of the first torsion spring is connected to the main mounting plate.

[0017] Optionally, the four-way pneumatic leg support mechanism further comprises a second torsion spring, one side of the auxiliary support plate is rotationally connected to the auxiliary mounting plate through a second rotating shaft, the second torsion spring is sleeved on the second rotating shaft, one end of the second torsion spring is connected to the auxiliary support plate, and the other end of the second torsion spring is connected to the auxiliary mounting plate.

[0018] Optionally, one side of the main support plate is provided with a first connecting portion, the first connecting portion has a first limiting block protruding outward in a first direction;

[0019] The first connecting portion is rotationally connected to the main mounting plate, the main mounting plate is provided with a first limiting groove, the first limiting groove has an opening facing the main support plate; when the main support plate turns outward to the maximum angle, the first limiting block is located in the first limiting groove, and the side wall of the first limiting groove can limit the first limiting block from continuing to rotate.

[0020] Optionally, one side of the auxiliary support plate is provided with a second connecting portion, the second connecting portion has a second limiting block protruding outward in a second direction;

[0021] The second connecting part is rotationally connected with the auxiliary mounting plate, the auxiliary mounting plate is provided with a second limiting groove, and the second limiting groove has an opening facing the auxiliary supporting plate; when the auxiliary supporting plate is flipped outward to the maximum angle, the second limiting block is located in the second limiting groove, and the sidewall of the second limiting groove can limit the second limiting block from continuing to rotate.

[0022] Optionally, the auxiliary supporting plate is connected with baffle plates at both ends along the direction of the hinge axis of the auxiliary supporting plate, and the auxiliary lifting air bag group is located between the two baffle plates.

[0023] Optionally, the baffle plates are fan-shaped, and the side of the baffle plates away from the hinge axis of the auxiliary supporting plate is arc-shaped.

[0024] Optionally, the four-way pneumatic leg supporting mechanism further comprises a main leg supporting air bag, and the main leg supporting air bag is fixed to the top surface of the main supporting plate.

[0025] Optionally, the main leg supporting air bag comprises at least one middle air bag and two side air bags, all the middle air bags are located between the two side air bags in a third direction, the middle air bags and the side air bags are isolated from each other, and the middle air bags and the side air bags are respectively connected with different air paths; wherein the third direction is the direction of the hinge axis of the main supporting plate.

[0026] Optionally, the four-way pneumatic leg supporting mechanism further comprises a secondary leg supporting air bag, the secondary leg supporting air bag is fixed to the top surface of the auxiliary supporting plate, and the secondary leg supporting air bag and the main leg supporting air bag are respectively connected with different air paths.

[0027] Optionally, the main leg supporting air bag and the secondary leg supporting air bag are integrally formed.

[0028] Optionally, the side of the main mounting plate, which is hinged with the main supporting plate, is provided with a notch, the notch penetrates through both side surfaces of the main mounting plate in the thickness direction, and the air path connected with the main leg supporting air bag is led out through the notch; the top surface of the main supporting plate is provided with a guide groove, one end of the guide groove is communicated with the notch, and the other end of the guide groove extends towards the side close to the auxiliary supporting plate, and the air path connected with the secondary leg supporting air bag is arranged along the guide groove and led out through the notch.

[0029] Optionally, the four-way pneumatic leg supporting mechanism further comprises a leg supporting foam and a leg supporting surface sleeve, the leg supporting foam comprises a main foam part and an auxiliary foam part, the main foam part is fixed to the top surface of the main supporting plate, the auxiliary foam part is fixed to the top surface of the auxiliary supporting plate, and the leg supporting surface sleeve is sleeved outside the leg supporting foam.

[0030] In another aspect, the embodiment of the present application provides a seat, which comprises a seat framework and the four-way pneumatic leg supporting mechanism.

[0031] On the other hand, embodiments of the present invention provide a control method for a four-way pneumatic leg support mechanism, applied to the aforementioned four-way pneumatic leg support mechanism, including an initial state and a usage state. In the initial state, the main lifting air bag group and the auxiliary lifting air bag group are completely deflated, and the auxiliary support plate is attached to the auxiliary mounting plate and together flips to the underside of the main mounting plate. During the transition from the initial state to the usage state, after the main lifting air bag group is inflated for a certain period of time, the auxiliary lifting air bag group begins to inflate. During the transition from the usage state to the initial state, after the auxiliary lifting air bag group is deflated for a certain period of time, the main lifting air bag group begins to deflate.

[0032] In the four-way pneumatic leg support mechanism of the present invention, the main lifting airbag assembly can lift the main support plate and flip it upward relative to the main mounting plate around the hinge point during inflation, thereby initially extending the support length of the leg support. The secondary lifting airbag assembly can lift the secondary support plate and flip it forward relative to the secondary mounting plate around the hinge point during inflation, thereby further extending the support length of the leg support and increasing the length of the leg support when fully extended. When the main and secondary lifting airbag assemblies are completely deflated, they flatten, the secondary support plate flips back to almost fit against the secondary mounting plate, and the main support plate flips down, causing the secondary support plate and secondary mounting plate to flip under the main mounting plate, achieving a secondary fold. This allows the main mounting plate, main support plate, secondary mounting plate, and secondary support plate to fold together, reducing the storage space of the four-way pneumatic leg support mechanism. Moreover, the main and secondary lifting airbag assemblies inflate rapidly, resulting in a rapid lifting speed of the main and secondary support plates. The main and auxiliary lifting airbag assemblies produce less noise and are quieter during inflation and deflation, resulting in higher seat comfort. In summary, the four-way pneumatic leg support mechanism of this application combines high lifting efficiency, high comfort, long support length, and small storage space. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a seat provided in an embodiment of the present invention;

[0034] Figure 2 yes Figure 1 A schematic diagram of the four-way pneumatic leg support mechanism in its initial state;

[0035] Figure 3 yes Figure 1 A schematic diagram of the four-way pneumatic leg support mechanism in its intermediate state;

[0036] Figure 4 yes Figure 3 Longitudinal cross-sectional view;

[0037] Figure 5 yes Figure 1is a structural schematic view of the four-way pneumatic leg support mechanism in the fully extended state;

[0038] Figure 6 is Figure 5 a perspective view of the four-way pneumatic leg support mechanism in the fully extended state;

[0039] Figure 7 is Figure 5 a longitudinal sectional view of the four-way pneumatic leg support mechanism in the fully extended state;

[0040] Figure 8 is Figure 1 a structural schematic view of the four-way pneumatic leg support mechanism in the fully extended state;

[0041] Figure 9 is Figure 8 a side view of the four-way pneumatic leg support mechanism in the fully extended state.

[0042] The reference signs in the description are as follows:

[0043] 1, main mounting plate; 11, first limiting groove; 12, notch; 2, main support plate; 21, first connecting part; 211, first limiting block; 22, guide groove; 3, main lifting air bag group; 31, main lifting air bag; 4, auxiliary mounting plate; 41, second limiting groove; 5, auxiliary support plate; 51, second connecting part; 511, second limiting block; 52, baffle; 53, front shielding part; 6, auxiliary lifting air bag group; 61, auxiliary lifting air bag; 7, tension spring; 8, first torsional spring; 9, second torsional spring; 10, main leg support air bag; 101, side air bag; 102, middle air bag; 20, auxiliary leg support air bag; 30, seat framework; 40, leg support surface sleeve; 50, corner bracket. DETAILED DESCRIPTION

[0044] In order to make the technical problems solved by the present application, the technical solutions and beneficial effects more clearly understood, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0045] The four-way pneumatic leg support mechanism adds an independently adjustable auxiliary leg support to the main leg support (fixed leg support), which can extend the support length of the leg support to the ankle, realize full-section fitting support from the calf to the ankle, and reduce leg fatigue during long-distance travel. Moreover, since the auxiliary leg support is independently adjusted from the main leg support, it can realize segmented adjustment of the length and angle of the leg support, thereby adapting to the leg support needs of users of different heights (especially the ankle part).

[0046] As Figure 1As shown, the seat provided by an embodiment of the present application comprises a main support plate 2, a main mounting plate 1, a main lifting air bag group 3, a secondary support plate 5, a secondary mounting plate 4 and a secondary lifting air bag group 6. The main mounting plate 1 is fixed on a seat framework 30. One side of the main support plate 2 is hinged to the main mounting plate 1.

[0047] The main lifting air bag group 3 comprises at least two layers of main lifting air bags 31, which are stacked between the main support plate 2 and the main mounting plate 1. The main lifting air bags 31 are inflated to push the main support plate 2 to turn outwards relative to the main mounting plate 1.

[0048] The secondary mounting plate 4 is fixed to the other side of the main support plate 2. One side of the secondary support plate 5 is hinged to the secondary mounting plate 4. The secondary lifting air bag group 6 comprises at least two layers of secondary lifting air bags 61, which are stacked between the secondary mounting plate 4 and the secondary support plate 5. The secondary lifting air bags 61 are inflated to push the secondary support plate 5 to turn outwards relative to the secondary mounting plate 4.

[0049] The length of the main support plate 2 is greater than the length of the main mounting plate 1. When the main lifting air bag group 3 and the secondary lifting air bag group 6 are completely deflated, the secondary support plate 5 and the secondary mounting plate 4 are turned to below the main mounting plate 1.

[0050] Specifically, in the normal sitting state, the four-way pneumatic leg support mechanism is in the initial state, as shown in Figure 2 As shown, the main lifting air bag group 3 and the secondary lifting air bag group 6 are completely deflated and flat. The main support plate 2 is almost attached to the main mounting plate 1. The secondary support plate 5 is almost attached to the secondary mounting plate 4 and is turned to below the main mounting plate 1 with the main support plate 2.

[0051] It can be understood that, since the secondary mounting plate 4 is fixed to the other side of the main support plate 2, the secondary mounting plate 4 and the secondary support plate 5 move with the main support plate 2 during the turning process of the one side of the main support plate 2 relative to the main mounting plate 1 around the hinge.

[0052] Since the length of the main support plate 2 is greater than the length of the main mounting plate 1, when the main lifting air bag group 3 and the secondary lifting air bag group 6 are completely deflated, the secondary support plate 5 and the secondary mounting plate 4 can be turned to below the main mounting plate 1, so that the main mounting plate 1, the main support plate 2, the secondary mounting plate 4 and the secondary support plate 5 are folded together, as shown in Figure 2 to reduce the occupied space of the four-way pneumatic leg support mechanism in the storage state and improve the flexibility of the four-way pneumatic leg support mechanism when arranged.

[0053] When the four-way pneumatic leg support mechanism needs to support the lower leg of the occupant, as shown in Figure 3 and Figure 4As shown, first, the main lifting air bag group 3 is inflated, and the inflated main lifting air bag 31 lifts the main support plate 2 to rotate around the hinge to the upper side away from the main mounting plate 1, to preliminarily extend the length of the leg support, and the main support plate 2 can support the upper part or the lower part of the passenger's leg. Figure 3 As shown, the four-way pneumatic leg support mechanism is in the intermediate state, and only the main lifting air bag group 3 is inflated.

[0054] When the four-way pneumatic leg support mechanism needs to support the lower part of the passenger's leg or the ankle, as shown, Figure 5 to Figure 7 As shown, the auxiliary lifting air bag group 6 is inflated, and the inflated auxiliary lifting air bag 61 lifts the auxiliary support plate 5 to rotate around the hinge to the front side away from the auxiliary mounting plate 4, to further extend the length of the leg support, so that the auxiliary support plate 5 can support the lower part of the passenger's leg or the ankle. Figure 5 As shown, the four-way pneumatic leg support mechanism is in the fully deployed state.

[0055] As can be understood, since the auxiliary support plate 5 and the main support plate 2 have a certain angle, during the rotation of the auxiliary support plate 5, the rotation radius of the auxiliary support plate 5 is larger than that of the main support plate 2, and the auxiliary support plate 5 rotates to the lowest point, which is the maximum rotation radius of the four-way pneumatic leg support mechanism during adjustment, Figure 8 As shown, the end point of the auxiliary support plate 5 of the four-way pneumatic leg support mechanism rotates to the lowest point.

[0056] When the four-way pneumatic leg support mechanism does not need to support the passenger's leg, the auxiliary lifting air bag group 6 is deflated, the inflation height of the auxiliary lifting air bag 61 is reduced, and the auxiliary support plate 5 rotates to reset to the rear side close to the auxiliary mounting plate 4. Then, the main lifting air bag 31 is deflated, the inflation height of the main lifting air bag 31 is reduced, and the main support plate 2 rotates to reset to the lower side close to the main mounting plate 1. When the auxiliary lifting air bag group 6 and the main lifting air bag group 3 are completely deflated, the auxiliary lifting air bag group 6 and the main lifting air bag group 3 are flat, occupy less space, the auxiliary support plate 5 almost fits the auxiliary mounting plate 4, and the main support plate 2 almost fits the main mounting plate 1. The auxiliary support plate 5 and the auxiliary mounting plate 4 move with the main support plate 2 to rotate to the lower side of the main mounting plate 1, and the seat returns to the initial state, i.e., the normal seat state, as shown. Figure 2 As shown.

[0057] Compared with the existing leg support mechanism driven by a mechanical structure, the four-way pneumatic leg support mechanism of the present application uses the inflation amount of the main lifting air bag 31 to change the lifting height of the main lifting air bag group 3, and further adjusts the lifting angle of the main support plate 2 relative to the main mounting plate 1; the inflation amount of the auxiliary lifting air bag group 6 is used to change the lifting height of the auxiliary lifting air bag group 6, and further adjust the lifting angle of the auxiliary support plate 5 relative to the auxiliary mounting plate 4. The noise of the main lifting air bag group 3 and the auxiliary lifting air bag group 6 during inflation and deflation is smaller and softer, which improves the comfort of the cabin.

[0058] Moreover, the inflation and expansion speed of the main lifting air bag group 3 and the auxiliary lifting air bag group 6 is fast, so that the lifting speed of the main support plate 2 and the auxiliary support plate 5 is fast, and the height of the main lifting air bag group 3 and the height of the auxiliary lifting air bag group 6 can be adjusted by controlling the inflation time and the inflation speed, so that the main support plate 2 and the auxiliary support plate 5 can be lifted to different angles, and the lifting height and the angle of the four-way pneumatic leg support mechanism can be steplessly adjusted to meet the comfort needs of different persons.

[0059] In addition, when the vehicle is in an accident, the main lifting air bag group 3 and the auxiliary lifting air bag group 6 can quickly deflate to provide a safe space for the passengers and greatly improve the safety of the passengers. The main lifting air bag group 3 and the auxiliary lifting air bag group 6 have low cost, which can greatly reduce the cost of the four-way pneumatic leg support mechanism.

[0060] The arrangement of at least two layers of main lifting air bags 31 in the main lifting air bag group 3 makes the bottom layer of main lifting air bags 31 be designed to adapt to the shape of the main mounting plate 1, facilitates the fixation with the main mounting plate 1, and improves the stability of the bottom of the main lifting air bag group 3; the top layer of main lifting air bags 31 can be designed to adapt to the shape of the main support plate 2, facilitate the connection and fixation with the main support plate 2, and make the main lifting air bag group 3 be able to stably support the main support plate 2.

[0061] The arrangement of at least two layers of auxiliary lifting air bags 61 in the auxiliary lifting air bag group 6 makes the bottom layer of auxiliary lifting air bags 61 be designed to adapt to the shape of the auxiliary mounting plate 4, facilitates the fixation with the auxiliary mounting plate 4, and improves the stability of the bottom of the auxiliary lifting air bag group 6; the top layer of auxiliary lifting air bags 61 can be designed to adapt to the shape of the auxiliary support plate 5, facilitate the connection and fixation with the auxiliary support plate 5, and make the auxiliary lifting air bag group 6 be able to stably support the auxiliary support plate 5.

[0062] In the seat of the present application, the main lifting air bag group 3 can lift the main support plate 2 to flip upward around the hinge relative to the main mounting plate 1 when inflated to preliminarily extend the support length of the leg rest. The auxiliary lifting air bag group 6 can lift the auxiliary support plate 5 to flip forward around the hinge relative to the auxiliary mounting plate 4 when inflated to further extend the support length of the leg rest and increase the length of the leg rest when fully unfolded. When the main lifting air bag group 3 and the auxiliary lifting air bag group 6 are completely deflated, the main lifting air bag group 3 and the auxiliary lifting air bag group 6 are flat, the auxiliary support plate 5 is flipped back to almost fit the auxiliary mounting plate 4, and the main support plate 2 is flipped back downward to drive the auxiliary support plate 5 and the auxiliary mounting plate 4 to flip to the lower side of the main mounting plate 1, so that the main mounting plate 1, the main support plate 2, the auxiliary mounting plate 4 and the auxiliary support plate 5 are folded together to reduce the storage space of the four-way pneumatic leg rest mechanism. Moreover, the inflation speed of the main lifting air bag group 3 and the auxiliary lifting air bag group 6 is fast, so that the lifting speed of the main support plate 2 and the auxiliary support plate 5 is fast, the noise of the main lifting air bag group 3 and the auxiliary lifting air bag group 6 when inflated and deflated is smaller and softer, and the comfort of the seat is higher. In summary, the four-way pneumatic leg rest mechanism of the present application has high lifting efficiency, high comfort, large support length and small storage space.

[0063] In an embodiment, when the flip angle of the main support plate 2 relative to the main mounting plate 1 is the same as the flip angle of the auxiliary support plate 5 relative to the auxiliary mounting plate 4, the hardness of the inflated main lifting air bag group 3 is greater than the hardness of the inflated auxiliary lifting air bag group 6, so that the stability of the main lifting air bag group 3 supporting the main support plate 2 is higher than the stability of the auxiliary lifting air bag 61 supporting the auxiliary support plate 5.

[0064] It can be understood that the inflated main lifting air bag 31 and the auxiliary lifting air bag 61 have a certain elasticity, the main support plate 2 supported by the main lifting air bag group 3 is easy to sway up and down, and the auxiliary support plate 5 supported by the auxiliary lifting air bag group 6 is easy to sway up and down.

[0065] Due to the comprehensive differences of human physiological structure, stress characteristics, kinematics and functional priority, the main support part is the “load bearing base” of the entire four-way pneumatic leg rest mechanism, and the auxiliary support part is the “extension assistance”, and the stability design requirement of the main support part is higher than that of the auxiliary support part.

[0066] Therefore, in the present application, the hardness of the main lifting air bag group 3 when inflated is greater than the hardness of the auxiliary lifting air bag group 6 when inflated, so that the stability of the main lifting air bag group 3 supporting the main support plate 2 is higher than the stability of the auxiliary lifting air bag 61 supporting the auxiliary support plate 5.

[0067] In an embodiment, the number of layers of the main lifting air bag 31 of the main lifting air bag group 3 is greater than the number of layers of the auxiliary lifting air bag 61 of the auxiliary lifting air bag group 6.

[0068] When the main support plate 2 and the auxiliary support plate 5 are turned over by the same angle, because the number of layers of the main lifting air bag 31 is greater than the number of layers of the auxiliary lifting air bag 61, the extrusion force between the inflated multi-layer main lifting air bag 31 is greater than the extrusion force between the inflated multi-layer auxiliary lifting air bag 61, the friction between adjacent main lifting air bags 31 is greater than the friction between adjacent auxiliary lifting air bags 61, the sliding between adjacent main lifting air bags 31 is less, the integrity of the main lifting air bag group 3 is better, and the main lifting air bag group 3 can jointly bear external force, which is "hard and anti-deformation", so that the stability of the main support plate 2 is better.

[0069] Specifically, as shown in Figure 7 , the main lifting air bag group 3 is provided with four layers of main lifting air bags 31, and the auxiliary lifting air bag group 6 is provided with three layers of auxiliary lifting air bags 61. Of course, in other embodiments, the number of layers of the main lifting air bag 31 and the number of layers of the auxiliary lifting air bag 61 can be adjusted according to actual needs.

[0070] In other embodiments, the rigidity of the main lifting air bag group 3 when inflated and expanded can be greater than the rigidity of the auxiliary lifting air bag group 6 when inflated and expanded by controlling the inflation amount of the main lifting air bag 31 to be greater than the inflation amount of the auxiliary lifting air bag 61.

[0071] In an embodiment, as shown in Figure 4 , the auxiliary mounting plate 4 is arranged perpendicular to the main support plate 2.

[0072] As shown in Figure 8 and Figure 9 , when the main lifting air bag group 3 is inflated and expanded, and the main support plate 2 drives the auxiliary support plate 5 to turn over, the end of the auxiliary support plate 5 will sweep through an arc range, and the larger the arc range, the larger the leg space below the seat actually occupied by the four-way pneumatic leg support mechanism.

[0073] Among them, as shown in Figure 9 , the length of the main support plate 2 is L1, the length of the auxiliary support plate 5 is L2, and the overall four-way pneumatic leg support mechanism occupies a height of L max when the end of the auxiliary support plate 5 is turned to the lowest position. max .

[0074] L1, L2, L max form a triangle, according to the trigonometric function: the sum of any two sides of the triangle is greater than the third side, that is: L1+L2>L max , the turning length conversion efficiency α>100%.

[0075] According to the cosine theorem, the formula of the third side can be obtained, and then the formula of the turning length conversion efficiency α is obtained:

[0076] ;

[0077] wherein θ is the angle between the secondary mounting plate 4 and the primary support plate 2;

[0078] At this time, let L1 / L2 = γ, the formula is transformed into:

[0079] ;

[0080] It can be concluded that when the value of γ is constant, the turnover length conversion efficiency α and θ are negatively correlated, that is, the smaller θ is, the higher the turnover length conversion efficiency α is.

[0081] Due to the support angle limitation of the secondary lifting air bag group 6, the angle of θ is usually greater than or equal to 90°, so as to facilitate the multi-layer secondary lifting air bag 61 of the secondary lifting air bag group 6 to transmit upward lifting force, therefore, when θ is selected to be the minimum 90°, the denominator of the formula is the smallest;

[0082] By θ = 90°, we get: .

[0083] Therefore, when the secondary mounting plate 4 is fixed vertically on the primary support plate 2, the turnover length conversion efficiency α is higher.

[0084] In an embodiment, the length of the primary support plate 2 is the same as the length of the secondary support plate 5.

[0085] The increase and decrease analysis of the above It can be concluded that α is strictly increasing when γ < 1, and α is strictly decreasing when γ > 1, therefore, α takes the maximum value at γ = 1, that is, when L1 = L2, the turnover length conversion efficiency α is maximum, and at this time the turnover length conversion efficiency α is = 141%.

[0086] Therefore, the primary support plate 2 and the secondary support plate 5 are set to be equal in length, so as to obtain the maximum turnover conversion efficiency under the same seat under leg space.

[0087] In an embodiment, as shown in Figure 4 and Figure 5 The secondary mounting plate 4 is fixed to the other side of the primary support plate 2 through the angle bracket 50, so that the primary support plate 2 and the secondary mounting plate 4 become a rigid body, improving the firmness of the secondary mounting plate 4 fixed on the primary support plate 2.

[0088] In an embodiment, as shown in Figure 2 , one side of the primary support plate 2 is provided with a first connecting part 21, and the first connecting part 21 has a first limiting block 211 protruding outward along a first direction. The "first direction" is the direction perpendicular to the hinge axis of the primary support plate 2 on the surface of the primary support plate 2.

[0089] The first connecting part 21 is rotatably connected to the main mounting plate 1. The main mounting plate 1 is provided with a first limiting groove 11, which has an opening facing the main support plate 2. Figure 6 and Figure 7 As shown, when the main support plate 2 is flipped outward to the maximum angle, the first limiting block 211 is located in the first limiting groove 11. The side wall of the first limiting groove 11 can restrict the first limiting block 211 from continuing to rotate, so as to limit the maximum flipping angle of the main support plate 2.

[0090] In one embodiment, such as Figure 6 and Figure 7 As shown, a second connecting portion 51 is provided on one side of the sub-support plate 5, and the second connecting portion 51 has a second limiting block 511 protruding outward along a second direction. The "second direction" refers to the direction on the plate surface of the sub-support plate 5 that is perpendicular to the hinge axis of the sub-support plate 5.

[0091] The second connecting part 51 is rotatably connected to the secondary mounting plate 4. The secondary mounting plate 4 is provided with a second limiting groove 41, which has an opening facing the secondary support plate 5. When the secondary support plate 5 is flipped outward to its maximum angle, the second limiting block 511 is located in the second limiting groove 41. The side wall of the second limiting groove 41 can restrict the second limiting block 511 from continuing to rotate, thereby limiting the maximum flipping angle of the secondary support plate 5.

[0092] Specifically, when the main support plate 2 and the secondary support plate 5 are rotated outward to their maximum angles, the top surface of the main support plate 2 and the top surface of the secondary support plate 5 are flush, so that the secondary support plate 5 can achieve the effect of being flush with the main support plate 2 after rotation. Of course, in actual use, the inflation volume of the main lifting air bag assembly 3 and the secondary lifting air bag assembly 6 can be adjusted as needed, thereby adjusting the rotation angle of the main support plate 2 and the secondary support plate 5.

[0093] In one embodiment, the main lifting air bag group 3 and the auxiliary lifting air bag group 6 are inflated through different air paths, so that the inflation amount of the main lifting air bag group 3 and the auxiliary lifting air bag group 6 can be adjusted independently. This allows for separate adjustment of the lifting height, inflation / deflation sequence, and inflation / deflation time of the main lifting air bag 31 and the auxiliary lifting air bag 61, enabling the four-way pneumatic leg support mechanism to meet more usage scenarios.

[0094] Specifically, the main lifting airbag assembly 3 is connected to the air pump through the first air pipe, and the auxiliary lifting airbag assembly 6 is connected to the air pump through the second air pipe. Both the first and second air pipes are connected to a switch valve. When the switch valve on the first air pipe is opened, the air pump inflates the main lifting airbag assembly 3 through the first air pipe. When the switch valve on the second air pipe is opened, the air pump inflates the auxiliary lifting airbag assembly 6 through the second air pipe.

[0095] Among them, the multi-layer main lifting airbags 31 of the main lifting airbag group 3 can be connected to form a multi-sub-airbag. Each main lifting airbag 31 has a first vent hole on the side near the adjacent main lifting airbag 31. The first vent holes on the adjacent main lifting airbags 31 are connected and connected by a weld around the first vent hole, so that the multi-layer main lifting airbags 31 are inflated through a first air pipe.

[0096] Similarly, the multiple sub-lifting airbags 61 of the sub-lifting airbag group 6 can be connected to form a multi-sub-airbag. Each sub-lifting airbag 61 has a second vent hole on the side closest to the adjacent sub-lifting airbag 61. The second vent holes on the adjacent sub-lifting airbags 61 are connected and connected by a weld around the second vent hole, so that the multiple sub-lifting airbags 61 can be inflated through a second air pipe.

[0097] In other embodiments, each layer of main lifting airbag 31 in the main lifting airbag group 3 can be an independent airbag, in which case each layer of main lifting airbag 31 can be connected to a first air tube. Each layer of secondary lifting airbag 61 in the secondary lifting airbag group 6 can be an independent airbag, and each layer of secondary lifting airbag 61 can be connected to a second air tube.

[0098] In one embodiment, such as Figure 3 As shown, the four-way pneumatic leg support mechanism also includes a tension spring 7, one end of which is connected to the main support plate 2, and the other end of which is connected to the main mounting plate 1; when the main lifting air bag group 3 is inflated, the main support plate 2 overcomes the tension of the tension spring 7 and flips outward.

[0099] Because the main lifting airbag assembly 3 elastically supports the main support plate 2, the main support plate 2 is prone to swaying up and down due to the main lifting airbag assembly 3. To improve the stability of the main support plate 2, a tension spring 7 is provided in this application. During the lifting process of the main support plate 2, the tension spring 7 continuously tightens the main support plate 2, providing continuous reverse resistance to the lifting of the main support plate 2 and improving the stability of the main support plate 2 during the flipping process.

[0100] Furthermore, the tension force of the tension spring 7 on the main support plate 2 ensures that the main support plate 2 is stably pressed against the main lifting airbag assembly 3, thereby greatly reducing the swaying amplitude of the main support plate 2 and improving the stability of the main support plate 2 in supporting the upper or lower legs of the occupant. When the main lifting airbag assembly 3 deflates, the tension spring 7 can provide a restoring torque to the main support plate 2, which is beneficial for the main support plate 2 to quickly return to its original position.

[0101] In one embodiment, such as Figure 2 As shown, tension springs 7 are provided at both ends of the main support plate 2 along its hinge axis, so that the opposite ends of the main support plate 2 can withstand the tension force of the tension springs 7 during the flipping process, thereby improving the force balance of the main support plate 2 and preventing the main support plate 2 from tilting during the flipping process.

[0102] In an embodiment, as shown in Figure 2 The four-way pneumatic leg support mechanism further comprises a first torsion spring 8, one side of the main support plate 2 is rotationally connected to the main mounting plate 1 through a first rotating shaft, the first torsion spring 8 is sleeved on the first rotating shaft, one end of the first torsion spring 8 is connected to the main support plate 2, and the other end of the first torsion spring 8 is connected to the main mounting plate 1.

[0103] The first torsion spring 8 can work with the tension spring 7 to provide a larger reset torque for the main support plate 2, so that the main support plate 2 can automatically turn inward when the main lifting air bag group 3 deflates, improving the reset efficiency. The deflated main lifting air bag 31 is an elastic body, which can slow down the recovery and buffering effect, inhibit the turning speed of the main support plate 2, and reduce the impact of the main support plate on the main mounting plate 1.

[0104] When the main lifting air bag group 3 lifts the main support plate 2, the tension spring 7 and the first torsion spring 8 work together to make the main support plate 2 firmly press on the main lifting air bag group 3, thereby improving the stability of the main support plate 2.

[0105] In an embodiment, as shown in Figure 2 The four-way pneumatic leg support mechanism further comprises a second torsion spring 9, one side of the auxiliary support plate 5 is rotationally connected to the auxiliary mounting plate 4 through a second rotating shaft, the second torsion spring 9 is sleeved on the second rotating shaft, one end of the second torsion spring 9 is connected to the auxiliary support plate 5, and the other end of the second torsion spring 9 is connected to the auxiliary mounting plate 4.

[0106] When the inflated auxiliary lifting air bag group 6 lifts the auxiliary support plate 5, the second torsion spring 9 can provide a larger reset torque for the auxiliary support plate 5, so that the auxiliary support plate 5 is stably pressed on the auxiliary lifting air bag group 6, thereby greatly reducing the shaking amplitude of the auxiliary support plate 5 and improving the stability of the auxiliary support plate 5 supporting the occupant. Moreover, since the stability requirement of the four-way pneumatic leg support mechanism for the auxiliary support plate 5 is lower than that for the main support plate 2, only the second torsion spring 9 is needed to achieve the required stability of the auxiliary support plate 5.

[0107] In addition, when the auxiliary lifting air bag group 6 deflates, the second torsion spring 9 can provide a larger reset torque when the auxiliary support plate 5 resets, so that the auxiliary support plate 5 can automatically turn inward, improving the reset efficiency.

[0108] In an embodiment, as shown in Figure 6 The two ends of the auxiliary support plate 5 along the hinge axis direction are connected with baffles 52, and the auxiliary lifting air bag group 6 is located between the two baffles 52 to shield the auxiliary lifting air bag 61, avoiding the auxiliary lifting air bag group 6 from being exposed in the occupant's field of vision and touch range, protecting and concealing the auxiliary lifting air bag group 6.

[0109] In an embodiment, as shown in Figure 6As shown, the side of the auxiliary support plate 5 away from the main support plate 2 is bent downward to form a front shielding part 53, which shields the front side of the auxiliary lifting air bag group 6.

[0110] In an embodiment, the baffle 52 is fan-shaped, and the side of the baffle 52 away from the hinge axis of the auxiliary support plate 5 is arc-shaped, which is curved toward the side close to the hinge axis of the auxiliary support plate 5, so as to reduce the size and space occupation of the baffle 52.

[0111] In an embodiment, as shown, Figure 1 the four-way pneumatic leg support mechanism further comprises a main leg support air bag 10 fixed to the top surface of the main support plate 2.

[0112] When the main leg support air bag 10 is inflated, the main leg support air bag 10 can conform to the shape of the calf, more evenly distribute the pressure of the leg, and improve comfort. The main leg support air bag 10 can change the softness by controlling the inflation amount, achieving stepless adjustment from the softest to the hardest, so that the passenger can adjust it arbitrarily according to the needs, and the adjustment process is smooth, smooth and less noisy.

[0113] In an embodiment, as shown, Figure 1 the main leg support air bag 10 comprises at least one middle air bag 102 and two side air bags 101, all the middle air bags 102 are located between the two side air bags 101 in the third direction, the middle air bags 102 are isolated from the side air bags 101, and the middle air bags 102 and the side air bags 101 are connected to different air paths respectively; wherein the third direction is the hinge axis direction of the main support plate 2, and the third direction is also the width direction of the leg placed on the leg support.

[0114] When the main leg support air bag 10 is inflated, the middle air bag 102 can conform to the upper part or the calf of the passenger's leg, and the side air bags 101 on both sides can conform to the sides of the passenger's calf. The side air bags 101 and the middle air bags 102 can be inflated and deflated separately to control the softness and inflation and deflation sequence of the corresponding air bags, achieve a soothing massage effect, and meet the comfort needs of different parts of the passenger's leg. For example, the side air bags 101 are inflated to a greater height than the middle air bags 102 to form a shape with high sides and low middle, which wraps the sides of the passenger's calf to prevent the leg from sliding to the sides.

[0115] Specifically, as shown, Figure 1 the main leg support air bag 10 comprises two middle air bags and two side air bags 101, and in actual design, the number of middle air bags 102 can be adjusted according to needs, such as one, three or more.

[0116] In an embodiment, as shown, Figure 1As shown, the four-way pneumatic leg support mechanism further comprises a secondary leg support air bag 20 fixed to the top surface of the secondary support plate 5, and the secondary leg support air bag 20 is connected to a different air path than the main leg support air bag 10.

[0117] When the secondary leg support air bag 20 is inflated, it can conform to the shape of the lower part of the passenger's calf or ankle area, so as to more evenly distribute the pressure on the calf leg and improve comfort. The secondary leg support air bag 20 can be independently adjusted in inflation amount from the main leg support air bag 10, and the softness and hardness of the secondary leg support air bag 20 can be adjusted as needed to achieve any degree of infinite adjustment from the softest to the hardest, so that the passenger can adjust it arbitrarily according to the needs, and the adjustment process is smooth, smooth and less noisy.

[0118] In an embodiment, as shown in Figure 1 , Figure 5 and Figure 6 , the side of the main mounting plate 1 that is hinged to the main support plate 2 is provided with a notch 12 that penetrates through both sides of the thickness direction of the main mounting plate 1, and the air path connected to the main leg support air bag 10 is led out through the notch 12. The top surface of the main support plate 2 is provided with a guide groove 22, one end of the guide groove 22 communicates with the notch 12, and the other end of the guide groove 22 extends to the side close to the secondary support plate 5. The air path connected to the secondary leg support air bag 20 is arranged along the guide groove 22 and led out through the notch 12, so that the air path connected to the main leg support air bag 10 and the air path connected to the secondary leg support air bag 20 are led out from the top side of the main support plate 2. The top side of the main support plate 2 has no moving parts, and the influence factors of the air path arrangement are less, which is convenient for the air path to be led out.

[0119] Moreover, the air path connected to the secondary leg support air bag 20 can be positioned through the guide groove 22, and the guide groove 22 provides a placement space for the air path to avoid the main leg support air bag 10 from pressing the air path and affecting the air inlet effect. Among them, the guide groove 22 is arranged corresponding to the gap region between the two middle air bags 102.

[0120] In an embodiment, as shown in Figure 1 , the main leg support air bag 10 and the secondary leg support air bag 20 are integrally formed, and the main leg support air bag 10 and the secondary leg support air bag 20 form an integral whole, which can be installed by one operation.

[0121] Among them, the weld seam separating the main leg support air bag 10 and the secondary leg support air bag 20 extends along the hinge axis direction of the secondary support plate 5, and the weld seam corresponds to the side edge of the main support plate 2 that is fixedly connected to the secondary mounting plate 4.

[0122] In an embodiment, as shown in Figure 1As shown, the four-way pneumatic leg support mechanism further comprises a leg support foam and a leg support face cover 40, the leg support foam comprises a main foam part and a sub-foam part, the main foam part is fixed to the top surface of the main support plate 2, the sub-foam part is fixed to the top surface of the sub-support plate 5, and the leg support face cover 40 is sleeved on the outside of the leg support foam. The "top surface of the main support plate 2" refers to the surface of the main support plate 2 for supporting the leg, and the "top surface of the sub-support plate 5" refers to the surface of the sub-support plate 5 for supporting the leg.

[0123] The main foam part and the sub-foam part are arranged separately, so that the overturning movement of the main foam part and the overturning movement of the sub-foam part do not affect each other, thereby avoiding the deformation of the main foam caused by pulling the main foam part when the sub-foam part overturns, which affects the supporting effect on the lower leg of the passenger.

[0124] In addition, an embodiment of the present application also provides a four-way pneumatic leg support mechanism, which has the same structure as the four-way pneumatic leg support mechanism in any of the above embodiments, and will not be described here.

[0125] In addition, an embodiment of the present application also provides a control method of a four-way pneumatic leg support mechanism, which is applied to the four-way pneumatic leg support mechanism in any of the above embodiments, and the four-way pneumatic leg support mechanism has an initial state and a use state. In the initial state, the main lifting air bag group 3 and the sub-lifting air bag group 6 are completely deflated, the sub-support plate 5 is attached to the sub-mounting plate 4 and is overturned together to below the main mounting plate 1. The completely deflated sub-lifting air bag group 6 is flat, and its volume is very small, which almost does not affect the attachment of the sub-support plate 5 to the sub-mounting plate 4.

[0126] In the process of switching from the initial state to the use state, after the main lifting air bag group 3 is inflated for a certain time, the sub-lifting air bag group 6 starts to be inflated, that is, the main leg support air bag 10 is inflated first and the sub-lifting air bag group 6 is inflated delayed, so that the sub-support plate 5 is overturned forward after the main support plate 2 is overturned upward by a certain angle, thereby reducing the height space occupied by the four-way pneumatic leg support mechanism in the unfolding process.

[0127] In the process of switching from the use state to the initial state, after the sub-lifting air bag group 6 is deflated for a certain time, the main lifting air bag group 3 starts to be deflated, that is, the sub-lifting air bag group 6 is deflated first and the main leg support air bag 10 is deflated delayed, so that the main support plate 2 is overturned inward to reset after the sub-support plate 5 is overturned inward to reset, thereby reducing the height space occupied by the four-way pneumatic leg support mechanism in the resetting process.

[0128] The "use state" refers to the state when the main support plate 2 and the sub-support plate 5 are both overturned outward by a certain angle.

[0129] The above-described embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A four-way pneumatic leg rest mechanism, characterized by, The four-way pneumatic leg support mechanism comprises a main support plate, a main mounting plate, a main lifting air bag group, a vice support plate, a vice mounting plate and a vice lifting air bag group. The main mounting plate is used for being fixed on a seat framework. The main lifting air bag group comprises at least two layers of main lifting air bags. The two layers of main lifting air bags are arranged in a stacked manner between the main support plate and the main mounting plate. The main lifting air bags are inflated to push the main support plate to overturn outward relative to the main mounting plate.

2. The four-way pneumatic leg rest mechanism of claim 1, wherein, The vice mounting plate is fixed on the other side of the main support plate.

3. The four-way pneumatic leg rest mechanism of claim 1, wherein, The vice support plate is hinged to the vice mounting plate.

4. The four-way pneumatic leg rest mechanism of claim 3, wherein, The vice lifting air bag group comprises at least two layers of vice lifting air bags.

5. The four-way pneumatic leg rest mechanism of claim 1, wherein, The two layers of vice lifting air bags are arranged in a stacked manner between the vice mounting plate and the vice support plate.

6. The four-way pneumatic leg rest mechanism of claim 1, wherein, The vice lifting air bags are inflated to push the vice support plate to overturn outward relative to the vice mounting plate.

7. The four-way pneumatic leg rest mechanism of claim 6, wherein, The length of the main support plate is greater than the length of the main mounting plate.

8. The four-way pneumatic leg rest mechanism of claim 1, wherein, When the main lifting air bag group and the vice lifting air bag group are completely deflated, the vice support plate and the vice mounting plate are overturned to below the main mounting plate.

9. The four-way pneumatic leg rest mechanism of claim 1, wherein, When the overturning angle of the main support plate relative to the main mounting plate is the same as the overturning angle of the vice support plate relative to the vice mounting plate, the hardness of the inflated main lifting air bag group is greater than the hardness of the inflated vice lifting air bag group. The number of layers of the main lifting air bags of the main lifting air bag group is greater than the number of layers of the vice lifting air bags of the vice lifting air bag group. The vice mounting plate is arranged perpendicularly to the main support plate. The length of the main support plate is the same as the length of the vice support plate. The main lifting air bag group and the vice lifting air bag group are inflated through different air paths. The four-way pneumatic leg support mechanism further comprises a tension spring. One end of the tension spring is connected to the main support plate. The other end of the tension spring is connected to the main mounting plate. When the main lifting air bag group is inflated, the main support plate overturns outward against the tension of the tension spring. The four-way pneumatic leg support mechanism further comprises a first torsion spring. One side of the main support plate is rotatably connected to the main mounting plate through a first rotating shaft. The first torsion spring is sleeved on the first rotating shaft. One end of the first torsion spring is connected to the main support plate. The other end of the first torsion spring is connected to the main mounting plate. The four-way pneumatic leg support mechanism further comprises a second torsion spring. One side of the vice support plate is rotatably connected to the vice mounting plate through a second rotating shaft. The second torsion spring is sleeved on the second rotating shaft. One end of the second torsion spring is connected to the vice support plate. The other end of the second torsion spring is connected to the vice mounting plate. One side of the main support plate is provided with a first connecting part. The first connecting part has a first limiting block protruding outward in a first direction. The first connecting part is rotatably connected to the main mounting plate. The main mounting plate is provided with a first limiting groove. When the main support plate overturns outward to the maximum angle, the first limiting block is located in the first limiting groove. The side wall of the first limiting groove can limit the first limiting block from continuing to rotate.

10. The four-way pneumatic leg rest mechanism of claim 9, wherein, The second connecting part is provided on one side of the auxiliary support plate and has a second limiting block protruding outward in a second direction; The second connecting part is rotationally connected with the auxiliary mounting plate, the auxiliary mounting plate is provided with a second limiting groove having an opening facing the auxiliary support plate; when the auxiliary support plate is turned outward to the maximum angle, the second limiting block is located in the second limiting groove, and the side wall of the second limiting groove can limit the second limiting block from continuing to rotate.

11. The four-way pneumatic leg rest mechanism of claim 1, wherein, The auxiliary support plate is connected with two baffle plates at both ends in the direction of the hinge axis of the auxiliary support plate, and the auxiliary lifting air bag group is located between the two baffle plates.

12. The four-way pneumatic leg rest mechanism of claim 11, wherein, The baffle plate is in the shape of a sector, and the side of the baffle plate away from the hinge axis of the auxiliary support plate is arc-shaped.

13. The four-way pneumatic leg rest mechanism of claim 1, wherein, The four-way pneumatic leg support mechanism further comprises a main leg support air bag fixed to the top surface of the main support plate.

14. The four-way pneumatic leg rest mechanism of claim 13, wherein, The main leg support air bag comprises at least one middle air bag and two side air bags, all the middle air bags are located between the two side air bags in a third direction, the middle air bags and the side air bags are isolated from each other, and the middle air bags and the side air bags are respectively connected with different air paths; wherein the third direction is the direction of the hinge axis of the main support plate.

15. The four-way pneumatic leg rest mechanism of claim 13, wherein, The four-way pneumatic leg support mechanism further comprises an auxiliary leg support air bag fixed to the top surface of the auxiliary support plate, and the auxiliary leg support air bag and the main leg support air bag are respectively connected with different air paths.

16. The four-way pneumatic leg rest mechanism of claim 15, wherein, The main leg support air bag and the auxiliary leg support air bag are integrally formed.

17. The four-way pneumatic leg rest mechanism of claim 15, wherein, The side of the main mounting plate hinged with the main support plate is provided with a notch, the notch penetrates through both side surfaces of the main mounting plate in the thickness direction, and the air path connected with the main leg support air bag is led out through the notch; The top surface of the main support plate is provided with a guide groove, one end of the guide groove is communicated with the notch, and the other end of the guide groove extends toward the side close to the auxiliary support plate, and the air path connected with the auxiliary leg support air bag is arranged along the guide groove and led out through the notch.

18. The four-way pneumatic leg rest mechanism of any of claims 1-17, wherein, The four-way pneumatic leg support mechanism further comprises a leg support foam and a leg support surface sleeve, the leg support foam comprises a main foam part and an auxiliary foam part, the main foam part is fixed to the top surface of the main support plate, the auxiliary foam part is fixed to the top surface of the auxiliary support plate, and the leg support surface sleeve is sleeved outside the leg support foam.

19. A seat, characterized in that The four-way pneumatic leg support mechanism comprises a seat framework and any one of the four-way pneumatic leg support mechanisms in claims 1 to 18.

20. A control method of a four-way pneumatic leg rest mechanism, characterized by, The four-way pneumatic leg support mechanism in any one of claims 1 to 18 comprises an initial state and a use state, in the initial state, the main lifting air bag group and the auxiliary lifting air bag group are completely deflated, the auxiliary support plate is attached to the auxiliary mounting plate and is turned together to below the main mounting plate; in the process of switching from the initial state to the use state, after the main lifting air bag group is inflated for a certain time, the auxiliary lifting air bag group starts to inflate; in the process of switching from the use state to the initial state, after the auxiliary lifting air bag group is deflated for a certain time, the main lifting air bag group starts to deflate.

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