Seat leg support mechanism and seat

Abstract

The invention belongs to the technical field of seat leg supports, and particularly relates to a seat leg support mechanism and a seat. The seat leg support mechanism comprises a leg support supporting plate, a leg support mounting plate, a lifting air bag set and a leg support air bag set, the leg support mounting plate is used for being fixed to a seat framework, one side of the leg support supporting plate is hinged to the leg support mounting plate, and the leg support supporting plate can turn over around the hinged position relative to the leg support mounting plate; the lifting air bag set comprises at least two layers of lifting air bags, the two layers of lifting air bags are arranged between the leg support supporting plate and the leg support mounting plate in a stacked mode, and the lifting air bags are inflated to expand so as to push the leg support supporting plate to turn over outwards; the leg support air bag set is arranged on the side, back on to the leg support mounting plate, of the leg support supporting plate. When the lifting air bag set and the leg support air bag set are inflated and deflated, noise is smaller and softer, the comfort of the cabin is improved, the inflation expansion speed of the lifting air bag set is high, and the lifting efficiency of the leg support supporting plate is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of seat leg rest, in particular to a seat leg rest mechanism and a seat. BACKGROUND

[0002] Part of the vehicle seat is 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 reduce leg fatigue.

[0003] The existing leg rest mechanism drives the leg rest to overturn through an electrically driven linkage mechanism, which has low leg rest lifting efficiency, a relatively hard overall structure of the leg rest mechanism, limited comfort of leg support, and loud noise during work, which affects the driving experience.

[0004] It can be seen that the existing leg rest mechanism cannot balance high lifting efficiency and comfort. SUMMARY

[0005] The present application can provide a seat leg rest mechanism and a seat, which can balance high lifting efficiency and comfort.

[0006] To solve the above technical problems, on the one hand, the present application provides a seat leg rest mechanism, which comprises a leg rest support plate, a leg rest mounting plate, a lifting air bag group and a leg rest air bag group, the leg rest mounting plate is used for being fixed on a seat framework, one side of the leg rest support plate is hinged to the leg rest mounting plate, and the leg rest support plate can be overturned relative to the leg rest mounting plate about the hinge; The lifting air bag group comprises at least two layers of lifting air bags, the two layers of lifting air bags are stacked between the leg rest support plate and the leg rest mounting plate, and the lifting air bags are inflated to push the leg rest support plate to turn outward.

[0007] Optionally, the lifting air bag group comprises at least three layers of lifting air bags, the at least three layers of lifting air bags are stacked between the leg rest support plate and the leg rest mounting plate, the at least three layers of lifting air bags are divided into a bottom air bag, a top air bag and a middle air bag, the bottom air bag is fixed on the leg rest mounting plate, the top air bag is fixed on the leg rest support plate, and the middle air bag is fixed between the bottom air bag and the top air bag.

[0008] Optionally, the seat leg rest mechanism further comprises a tension spring, one end of the tension spring is connected to the leg rest support plate, and the other end of the tension spring is connected to the leg rest mounting plate; when the lifting air bag is inflated, the leg rest support plate turns outward against the tension of the tension spring.

[0009] Optionally, the leg rest support plate is provided with a plurality of first hooks, the plurality of first hooks are arranged at intervals along a first direction, a side of the leg rest mounting plate corresponding to the first hooks is provided with a plurality of second hooks, one end of the tension spring is selectively hooked on any one of the first hooks, and the other end of the tension spring is selectively hooked on any one of the second hooks.

[0010] Optionally, the seat leg rest mechanism further comprises a torsion spring, one side of the leg rest support plate is rotationally connected to the leg rest mounting plate through a rotating shaft, the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is connected to the leg rest support plate, and the other end of the torsion spring is connected to the leg rest mounting plate.

[0011] Optionally, one side of the leg rest support plate is provided with a connecting portion, the connecting portion has a limiting block protruding outward along a first direction; the connecting portion is rotationally connected to the leg rest mounting plate, the leg rest mounting plate is provided with a limiting groove, the limiting groove has an opening facing the leg rest support plate, when the leg rest support plate is flipped outward to a set angle, the limiting block is located in the limiting groove, and a side wall of the limiting groove can limit the limiting block from continuing to rotate.

[0012] Optionally, the lifting air bag group and the leg rest air bag group are inflated by different air sources.

[0013] Optionally, the leg rest air bag group comprises one leg rest air bag, the leg rest air bag has two vertical welds distributed at intervals along a second direction, the vertical welds extend along a third direction, the two vertical welds divide the leg rest air bag into a middle block and two side blocks, and the middle block is located between the two side blocks in the second direction. the middle block has at least two transverse welds distributed at intervals along the third direction, the transverse welds extend along the second direction, and the at least two transverse welds divide the middle block into a plurality of sub-blocks; the side block has a cross-sectional area greater than that of the sub-block, and the sub-block communicates with the side block; and the second direction is perpendicular to the third direction on a cross section of the leg rest air bag.

[0014] Optionally, the seat leg rest mechanism further comprises a folding cover, the folding cover comprises a cover body, the cover body is provided with a plurality of folds distributed along a flipping direction of the leg rest support plate, one side of the cover body is connected to the leg rest mounting plate, and the other side of the cover body is fixed relative to a position of the leg rest support plate. The leg rest support plate can be flipped between a folded position and an unfolded position relative to the leg rest mounting plate, in the folded position, the lifting air bag is deflated, the leg rest support plate is attached to the leg rest mounting plate, and the shield body is folded according to the creases; when the leg rest support plate is flipped to the unfolded position, an opening is formed between the leg rest support plate and the leg rest mounting plate, the leg rest support plate drives the shield body to unfold, and the shield body closes the opening.

[0015] Optionally, the shield body comprises a shield end and two shield sides, the two shield sides are arranged along the hinge axis direction of the leg rest support plate, and the shield end is connected to the outer end edges of the two shield sides, and the shield end and the two shield sides form a U-shaped structure.

[0016] Optionally, the folding shield further comprises an upper connecting frame and a lower connecting frame, the upper connecting frame and the lower connecting frame are in a U shape, the upper connecting frame is connected to the outer periphery of the side of the shield body close to the leg rest support plate, the lower connecting frame is connected to the outer periphery of the side of the shield body close to the leg rest mounting plate, the upper connecting frame is connected to the leg rest support plate, and the lower connecting frame is connected to the leg rest mounting plate.

[0017] Optionally, the folding shield further comprises a framework, and the framework is embedded and fixed at the creases.

[0018] Optionally, the framework comprises an inner support ring and an outer support ring, the plurality of creases are divided into inner creases and outer creases, the plurality of inner creases and the plurality of outer creases are arranged alternately along the unfolding direction of the shield body, one inner crease is arranged between two adjacent outer creases, and the inner crease is located on the inner side of the outer crease. The inner support ring is arranged at the inner crease, and the outer support ring is arranged at the outer crease.

[0019] Optionally, the seat leg rest mechanism further comprises a leg rest surface sleeve and a leg rest foam layer, the leg rest foam layer is located at the top of the leg rest air bag group, the leg rest surface sleeve is sleeved outside the leg rest foam layer, the other side of the shield body is connected to the leg rest surface sleeve, and the shield body isolates the leg rest air bag group from the outside.

[0020] In another aspect, the embodiment of the present application provides a seat comprising a seat framework and the seat leg rest mechanism.

[0021] The seat leg support mechanism of the present application, the lifting air bag group can lift the leg support plate to turn outward relative to the leg support mounting plate around the hinge when inflated, to extend the length of the seat, so that the seat can support the legs of the occupant, and the leg support plate can be turned inward to reset by deflating the lifting air bag group, to change the height of the lifting air bag group by the inflation amount of the lifting air bag, and then adjust the lifting angle of the leg support plate. The lifting air bag group has a faster inflation speed, and the leg support plate has a higher lifting efficiency. The leg support air bag group on the leg support plate can support the legs of the occupant when inflated, so that the top surface of the leg support leg can better fit the shape of the legs, and can more evenly distribute the pressure of the legs, improving comfort. The lifting air bag group and the leg support air bag group have smaller and softer noise when inflated and deflated, improving the comfort of the cabin. In summary, the seat leg support mechanism of the present application has high lifting efficiency and high comfort. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a seat provided by an embodiment of the present application; Figure 2 is a sectional view of the seat leg support mechanism in Figure 1 Figure 3 is an exploded view of the seat leg support mechanism in Figure 1 Figure 4 is a structural schematic diagram of the seat leg support mechanism in Figure 3 Figure 5 is a state diagram of the tension spring in Figure 3 Figure 6 is a state diagram of the tension spring in Figure 3 Figure 7 is a structural schematic diagram of the seat leg support mechanism in Figure 3 Figure 8 is a structural schematic diagram of the folding shroud in Figure 7 Figure 9 is a structural schematic diagram of another view of Figure 8 Figure 10 is a cross-sectional view of the lifting air bag in Figure 2 Figure 11 is a cross-sectional view of the leg support air bag in Figure 2

[0023] Reference signs in the specification are as follows: ​​​​​​​​​​1. Seat frame; 2. Leg rest mounting plate; 21. Second hook; 22. Limiting groove; 3. Leg rest support plate; 31. First hook; 32. Connecting part; 321. Limiting block; 4. Lifting airbag assembly; 41. Lifting airbag; 411. Bottom airbag; 412. Middle airbag; 413. Top airbag; 414. Vent hole; 5. Leg rest airbag assembly; 51. Leg rest airbag; 511. Side section; 512 5. Central Block; 5.13 Vertical Weld; 5.14 Horizontal Weld; 6. Leg Support Foam Layer; 7. Leg Support Cover; 8. Folding Protective Cover; 8.1 Protective Cover Body; 8.11 Crease; 8.111 Inner Layer Crease; 8.112 Outer Layer Crease; 8.2 Cover End Girder; 8.3 Cover Side Girder; 8.4 Upper Connecting Frame; 8.5 Lower Connecting Frame; 8.6 Inner Support Ring; 8.7 Outer Support Ring; 9. Tension Spring; 10. Torsion Spring. Detailed Implementation

[0024] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0025] like Figures 1 to 3 As shown, an embodiment of the present invention provides a seat including a seat frame 1 and a seat leg support mechanism. The seat leg support mechanism includes a leg support support plate 3, a leg support mounting plate 2, a lifting air bag assembly 4, and a leg support air bag assembly 5. The leg support mounting plate 2 is fixed on the seat frame 1. One side of the leg support support plate 3 is hinged to the leg support mounting plate 2. The leg support support plate 3 can rotate relative to the leg support mounting plate 2 around the hinge.

[0026] The lifting airbag assembly 4 includes at least two layers of lifting airbags 41, which are stacked between the leg support plate 3 and the leg support mounting plate 2. The lifting airbags 41 inflate to push the leg support plate 3 outward. The leg support airbag assembly 5 is located on the side of the leg support plate 3 facing away from the leg support mounting plate 2, and the leg support airbag assembly 5 can support the occupant's legs when inflated.

[0027] Specifically, when a seat leg support mechanism is needed to support the human leg, such as... Figure 2 As shown, the lifting airbag assembly 4 is inflated, and the inflated lifting airbag 41 lifts the leg support plate 3 and flips it to the side away from the leg support mounting plate 2 by the required angle to extend the length of the seat so that the seat can support the occupant's legs.

[0028] When the leg support mechanism is not needed to support the legs, the airbag assembly 4 deflates, and the leg support plate 3 folds back towards the side closest to the leg support mounting plate 2. Figure 4 As shown, this is to restore the seat to a normal sitting position.

[0029] The arrangement of at least two layers of lifting airbags 41 allows the bottom lifting airbag 41 to be designed to fit the shape of the leg support mounting plate 2, facilitating its fixation and improving the stability of the bottom of the lifting airbag assembly 4. The top lifting airbag 41 can be designed to fit the shape of the leg support support plate 3, facilitating its connection and fixation to the leg support support plate 3, thus enabling the lifting airbag assembly 4 to stably support the leg support support plate 3.

[0030] Compared to existing leg support mechanisms that use mechanical structures to drive the leg support plate 3 to flip, the seat leg support mechanism of this application utilizes the inflation volume of the lifting airbag 41 to change the height of the lifting airbag assembly 4, thereby adjusting the lifting angle of the leg support plate 3. The lifting airbag assembly 4 produces less noise and is quieter during inflation and deflation, improving cabin comfort. Moreover, the lifting airbag assembly 4 inflates and expands faster, resulting in a faster lifting speed of the leg support plate 3. The height of the lifting airbag assembly 4 can also be adjusted by controlling the inflation time and inflation speed, allowing the leg support plate 3 to be raised to different angles. This achieves stepless adjustment of the lifting height of the leg support plate 3 to meet the comfort needs of different people.

[0031] Furthermore, in the event of a vehicle accident, the lifting airbag assembly 4 can quickly deflate, creating a safe space for the occupants and significantly improving their safety. The lifting airbag assembly 4 is also relatively inexpensive, which can greatly reduce the cost of the seat leg support mechanism.

[0032] like Figure 2 As shown, the leg support airbag assembly 5 on the leg support support plate 3 can inflate and support the occupant's legs, making the leg support more conform to the shape of the legs and more evenly distributing the pressure on the legs, thus improving comfort. Furthermore, the leg support airbag assembly 5 can be adjusted in firmness by controlling the inflation amount, achieving stepless adjustment from the softest to the firmest level, allowing the occupant to adjust it as needed. The adjustment process is smooth, quiet, and stable.

[0033] In the seat of this invention, the lifting airbag assembly 4 can lift the leg support plate 3 and flip it outwards relative to the leg support mounting plate 2 around the hinge point when inflated, thereby extending the length of the seat and enabling the seat to support the occupant's legs. Alternatively, the leg support plate 3 can be flipped inwards by deflating the lifting airbag assembly 4, allowing the height of the lifting airbag assembly 4 to be changed using the inflation amount of the lifting airbag 41, thus adjusting the lifting angle of the leg support plate 3. The lifting airbag assembly 4 inflates relatively quickly, resulting in a faster lifting speed for the leg support plate 3. The leg support airbag assembly 5 on the leg support plate 3 supports the occupant's legs when inflated, making the top surface of the leg support more conform to the shape of the leg, distributing pressure more evenly and improving comfort. The lifting airbag assembly 4 and the leg support airbag assembly 5 produce less noise and a smoother sound during inflation and deflation, enhancing cabin comfort. In summary, the seat leg support mechanism of this application combines high lifting efficiency with high comfort.

[0034] In one embodiment, such as Figure 2 As shown, the lifting airbag assembly 4 includes at least three layers of lifting airbags 41, which are stacked between the leg support plate 3 and the leg support mounting plate 2. The at least three layers of lifting airbags 41 are divided into a bottom airbag 411, a top airbag 413, and a middle airbag 412. The bottom airbag 411 is fixed on the leg support mounting plate 2, the top airbag 413 is fixed on the leg support plate 3, and the middle airbag 412 is fixed between the bottom airbag 411 and the top airbag 413.

[0035] The intermediate airbag 412 fills the support gap between the bottom airbag 411 and the top airbag 413, making the contact surface between adjacent lifting airbags 41 more continuous and preventing the leg support plate 3 from tilting or swaying due to the discontinuity of the stress point during the lifting process. The intermediate airbag 412 can also share the load-bearing pressure of the bottom airbag 411 and the top airbag 413, reducing the stress on a single layer of lifting airbag 41 and reducing the possibility of lifting airbag 41 rupture.

[0036] Moreover, the bottom air bag 411, the middle air bag 412 and the top air bag 413 form a stepped support. When the air bag group 4 is inflated, the bottom air bag 411, the middle air bag 412 and the top air bag 413 expand synchronously and the expansion height is superimposed, which can lift the leg support plate 3 more quickly and further improve the lifting efficiency of the leg support plate 3.

[0037] Specifically, such as Figure 2 As shown, the lifting airbag group 4 is equipped with three layers of lifting airbags 41. In actual design, the number of lifting airbags 41 in the lifting airbag group 4 can be adjusted according to actual needs, for example, two layers, four layers or more.

[0038] In one embodiment, such as Figure 2 , Figure 5 andFigure 6 As shown, the seat leg support mechanism also includes a tension spring 9, one end of which is connected to the leg support plate 3, and the other end of which is connected to the leg support mounting plate 2; when the air bag 41 is inflated, the leg support plate 3 flips outward against the tension of the tension spring 9.

[0039] Because the lifting airbag assembly 4 elastically supports the leg support plate 3, the leg support plate 3 is prone to swaying up and down due to the lifting of the airbag 41. To improve the stability of the leg support plate 3, a tension spring 9 is provided in this application. During the lifting process of the leg support plate 3, the tension spring 9 continuously tensions the leg support plate 3, providing continuous reverse resistance for the lifting of the leg support plate 3, thereby improving the stability of the leg support plate 3 during the flipping process.

[0040] Furthermore, the tension force of the tension spring 9 on the leg support plate 3 ensures that the leg support plate 3 is stably pressed against the lifting airbag assembly 4, thereby greatly reducing the swaying amplitude of the leg support plate 3 and improving the stability of the seat leg support mechanism in supporting the legs. When the lifting airbag assembly 4 deflates, the tension spring 9 provides a restoring torque to the leg support plate 3, which facilitates the rapid reset of the leg support plate 3.

[0041] Figure 5 The diagram shows the state of the tension spring 9 when the leg support plate 3 is folded back to the normal sitting position. At this time, the tension spring 9 is in a stretched state, so that the leg support plate 3 can also be subjected to tension force in the folded-back state. Figure 6 This is a diagram showing the state of the tension spring 9 when the leg support plate 3 is unfolded relative to the leg support mounting plate 2.

[0042] In one embodiment, such as Figure 2 As shown, tension springs 9 are provided at both ends of the leg support plate 3 along its hinge axis, so that the opposite ends of the leg support plate 3 can withstand the tension force of the tension springs 9 during the flipping process, thereby improving the force balance of the leg support plate 3 and preventing the leg support plate 3 from tilting during the flipping process.

[0043] In one embodiment, such as Figure 2 , Figure 3 and Figure 6 As shown, the leg support plate 3 is provided with multiple first hooks 31, which are spaced apart along a first direction. The leg support mounting plate 2 has multiple second hooks 21 on the side corresponding to the first hooks 31. One end of the tension spring 9 selectively hooks onto any one of the first hooks 31, and the other end of the tension spring 9 selectively hooks onto any one of the second hooks 21. Figure 2 D1 in the diagram represents the first direction.

[0044] Understandably, when the tension spring 9 connects to the first hook 31 and the second hook 21 at different positions, the tension length of the tension spring 9 is different, resulting in different tension forces on the leg support plate 3 and different degrees of stability of the leg support plate 3 pressing against the lifting airbag assembly 4. Therefore, when actually installing the tension spring 9, the appropriate first hook 31 and second hook 21 can be selected according to the stability requirements of the leg support plate 3, so that the seat leg support mechanism can be adapted to different installation requirements, improving the versatility and flexibility of the seat leg support mechanism.

[0045] In one embodiment, such as Figure 3 As shown, the seat leg support mechanism also includes a torsion spring 10. One side of the leg support support plate 3 is rotatably connected to the leg support mounting plate 2 via a pivot. The torsion spring 10 is sleeved on the pivot. One end of the torsion spring 10 is connected to the leg support support plate 3, and the other end of the torsion spring 10 is connected to the leg support mounting plate 2.

[0046] When the airbag assembly 4 is deflated, the torsion spring 10 provides a large reset torque in the initial reset phase of the leg support plate 3, allowing the leg support plate 3 to automatically flip inward, thus improving the initial reset efficiency. In the later reset phase, the torsion spring 10 generates reverse resistance on the leg support plate 3, suppressing its flipping speed, reducing the impact of the leg support plate 3 on the leg support mounting plate 2, and preventing damage from impacts, ensuring the leg support plate 3 remains stable and reliable throughout the reset process.

[0047] In one embodiment, such as Figure 2 and Figure 3 As shown, the two ends of the leg support plate 3 along its hinge axis are rotatably connected to the leg support mounting plate 2 via the aforementioned pivot, so that the two ends of the leg support plate 3 along its hinge axis can be subjected to the restoring torque provided by the torsion spring 10, thereby improving the stability of the leg support plate 3 under force and preventing the leg support plate 3 from tilting during the restoring process.

[0048] In one embodiment, such as Figure 6 As shown, a connecting portion 32 is provided on one side of the leg support plate 3, and the connecting portion 32 has a limiting block 321 protruding outward along a first direction. Wherein, Figure 6 D1 in the diagram represents the first direction.

[0049] The connecting part 32 is rotatably connected to the leg support mounting plate 2. The leg support mounting plate 2 is provided with a limiting groove 22, which has an opening facing the leg support support plate 3. When the leg support support plate 3 is flipped outward to a set angle, the limiting block 321 is located in the limiting groove 22. The side wall of the limiting groove 22 can limit the limiting block 321 from continuing to rotate, so as to limit the maximum flipping angle of the leg support support plate 3 and prevent the leg support support plate 3 from unfolding too large.

[0050] In one embodiment, the lifting airbag assembly 4 and the leg support airbag assembly 5 are inflated by different air sources, so that the inflation amount of the lifting airbag assembly 4 and the leg support airbag assembly 5 can be adjusted independently, so as to separately adjust the lifting height of the lifting airbag assembly 4 and the firmness of the leg support airbag assembly 5, so that the seat leg support mechanism can meet more usage scenarios.

[0051] Specifically, such as Figure 10 and Figure 11 As shown, the lifting airbag assembly 4 is connected to the inflation port of the first air source through the first air pipe, and the leg support airbag assembly 5 is connected to the inflation port of the second air source through the second air pipe.

[0052] The first air tube connects to the bottommost lifting air bag 41, which is fixed to the leg support mounting plate 2. When the lifting air bag group 4 is inflated, the position of the bottommost lifting air bag 41 remains unchanged, so that the position of the first air tube remains basically unchanged.

[0053] The multiple lifting air bags 41 of the lifting air bag group 4 are connected to each other to form a multi-sub-air bag. Each lifting air bag 41 has a vent 414 on the side near the adjacent lifting air bag 41. Adjacent lifting air bags 41 are connected through the corresponding vent 414, so that the multiple lifting air bags 41 of the lifting air bag group 4 can be inflated by a first air source.

[0054] The lifting air bag 41 has a welded seam around its outer periphery, and the vent 414 is located in the middle of the lifting air bag 41. The vents 414 on two adjacent lifting air bags 41 are connected and linked by a welded seam around the vent 414.

[0055] In other embodiments, each layer of the lifting airbag group 4 can be an independent airbag. In this case, the multiple layers of lifting airbags 41 can be connected to the same air source through an air pipe.

[0056] In one embodiment, both the first and second air sources are air pumps, which can inflate and depressurize the corresponding air bags. In other embodiments, the first or second air source can be an air compressor.

[0057] In one embodiment, such as Figure 10 As shown, a connecting ear is provided on the side of the lifting airbag 41 near the hinge of the leg support plate 3. The connecting ear has a connecting hole, and a connector can pass through the connecting hole on the multi-layer lifting airbag 41 to connect one side of the multi-layer lifting airbag 41 together. This connector can be a strap.

[0058] In one embodiment, such as Figure 2 and Figure 11As shown, the leg support airbag assembly 5 includes a leg support airbag 51, which has two vertical welds 513 spaced apart along a second direction. The vertical welds 513 extend along a third direction, and the two vertical welds 513 divide the leg support airbag 51 into a central block 512 and two side blocks 511. The central block 512 is located between the two side blocks 511 in the second direction.

[0059] The central block 512 has at least two transverse welds 514 spaced apart along a third direction, the transverse welds 514 extending along a second direction, and the at least two transverse welds 514 divide the central block 512 into multiple sub-blocks. The cross-sectional area of ​​the side block 511 is larger than the cross-sectional area of ​​the sub-blocks, and the sub-blocks are connected to the side block 511; wherein, the second direction is perpendicular to the third direction on the cross-section of the leg support air bag 51. Figure 11 In the diagram, D2 represents the second direction, and D3 represents the third direction, which is also the length direction of the leg placed on the leg rest.

[0060] The distribution of vertical welds 513 and transverse welds 514 divides the leg support airbag 51 into two side sections 511 and multiple sub-sections. The cross-sectional area of ​​each sub-section is smaller than that of the side sections 511, allowing more space for the side sections 511. When the leg support airbag 51 inflates, the side sections 511 can inflate to a greater height than the central section 512, creating a shape that is high on both sides and low in the middle. This design effectively wraps around the sides of the legs, preventing them from slipping to the sides. After the leg support airbag 51 is completely deflated, it shrinks and flattens without affecting the aesthetic appearance.

[0061] Understandably, the spacing between the multiple transverse welds 514 of the central block 512 determines the height of the sub-block during inflation.

[0062] In one embodiment, such as Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 9 As shown, the seat leg support mechanism also includes a folding cover 8, which includes a cover body 81. The cover body 81 has multiple creases 811 distributed along the flipping direction of the leg support plate 3. One side of the cover body 81 is connected to the leg support mounting plate 2, and the other side of the cover body 81 is fixed relative to the position of the leg support plate 3.

[0063] The leg support plate 3 can flip between a folded position and an unfolded position relative to the leg support mounting plate 2. In the folded position, the airbag 41 is deflated, the leg support plate 3 fits against the leg support mounting plate 2, and the cover body 81 is folded along the crease 811. When the leg support plate 3 flips to the unfolded position, an opening is formed between the leg support plate 3 and the leg support mounting plate 2, the leg support plate 3 drives the cover body 81 to unfold, and the cover body 81 closes the opening.

[0064] Understandably, in order to achieve the folding function, the material of the protective cover body 81 needs to have low hardness and good ductility, so that it can deform during folding without breaking or fracturing.

[0065] Specifically, when the seat leg support mechanism is needed to support the occupant's legs, the lifting airbag assembly 4 inflates to push the leg support plate 3 to flip away from the leg support mounting plate 2 to the unfolded position, extending the length of the seat and thus providing support for the occupant's legs. During the flipping process, an opening is formed between the leg support plate 3 and the leg support mounting plate 2. The leg support plate 3 drives the other side of the protective cover body 81 to move, causing the protective cover body 81 to unfold in a fan shape simultaneously, thereby closing the opening and isolating the lifting airbag assembly 4 from the outside world, thus protecting the lifting airbag 41.

[0066] When the leg support mechanism is not needed to support the legs, the lifting airbag 41 deflates, reducing the inflation height of the lifting airbag assembly 4. The leg support plate 3 flips to the side closer to the leg support mounting plate 2 to the folded-back position. The leg support plate 3 drives the other side of the cover body 81 to move, so that the cover body 81 folds and retracts along the crease 811. The folded-back position is the position of the leg support plate 3 when the seat is in a normal sitting posture.

[0067] It should be noted that the unfolding position does not refer to a specific position, but can be different flip positions. Thus, when the seat leg support mechanism is actually used, the leg support plate 3 can be flipped to different angles to meet the needs of passengers of different heights and body types.

[0068] In one embodiment, such as Figure 7 , Figure 8 and Figure 9 As shown, the protective cover body 81 includes a cover end surround 82 and two cover side surrounds 83. The two cover side surrounds 83 are spaced apart along the hinge axis of the leg support plate 3. The cover end surround 82 connects the outer edge of the two cover side surrounds 83, and the cover end surround 82 and the two cover side surrounds 83 form a U-shaped structure.

[0069] Since the opening formed between the leg support plate 3 and the leg support mounting plate 2 has three openings exposed to the passenger's field of vision, namely two openings along the left and right directions of the seat and an opening facing the front of the seat, the end cover 82 and the two side covers 83 can respectively close the three outward openings of the opening so that the lifting airbag assembly 4 is completely enclosed in the cover body 81.

[0070] In other embodiments, the shield body 81 may only cover the end surround 82.

[0071] In one embodiment, such as Figure 3 , Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, the folding cover 8 also includes an upper connecting frame 84 and a lower connecting frame 85. The upper connecting frame 84 and the lower connecting frame 85 are U-shaped. The upper connecting frame 84 is connected to the outer periphery of the cover body 81 near the leg support plate 3, and the lower connecting frame 85 is connected to the outer periphery of the cover body 81 near the leg support mounting plate 2. The upper connecting frame 84 is connected to the leg support plate 3, and the lower connecting frame 85 is connected to the leg support mounting plate 2, so that the cover body 81 is connected to the leg support plate 3 through the upper connecting frame 84 and to the leg support mounting plate 2 through the lower connecting frame 85.

[0072] The upper connecting frame 84 of the U-shape has the same shape as the U-shaped structure of the shield body 81, and the lower connecting frame 85 of the U-shape has the same shape as the U-shaped structure of the shield body 81. The upper connecting frame 84 and the lower connecting frame 85 can maintain the U-shaped structure of the shield body 81 well.

[0073] Specifically, the upper connecting frame 84 and the lower connecting frame 85 have the same structure. Taking the upper connecting frame 84 as an example, its connection relationship with the cover body 81 will be described. The upper connecting frame 84 includes a first frame edge, a second frame edge, and a third frame edge. The first and third frame edges are spaced apart along the hinge axis of the leg support plate 3. The second frame edge connects the first and third frame edges, so that the first, second, and third frame edges form a U-shaped upper connecting frame 84. One side panel 83 of the cover body 81 is connected to the leg support plate 3 via the first frame edge, and the other side panel 83 of the cover body 81 is connected to the leg support plate 3 via the third frame edge. The end panel 82 of the cover body 81 is connected to the leg support plate 3 via the second frame edge.

[0074] In one embodiment, such as Figure 3 As shown, the folding shield 8 also includes a skeleton, which is embedded and fixed at the crease 811.

[0075] The frame provides stable support for the protective shield body 81. When the protective shield body 81 is unfolded, the frame maintains its predetermined shape, preventing it from collapsing or deforming and ensuring the integrity of the protective space. When the protective shield body 81 is folded, the frame, through its own structure, limits the folding direction and angle, ensuring an orderly and smooth folding process. Furthermore, the frame enhances the overall strength of the folded protective shield 81, resisting external impacts or compression and protecting the internal lifting airbag assembly 4.

[0076] Preferably, the upper side of the skeleton is connected to the upper connecting frame 84, and the lower side of the skeleton is connected to the lower connecting frame 85.

[0077] In one embodiment, such as Figure 2 , Figure 3 and Figure 9 As shown, the frame includes an inner support ring 86 and an outer support ring 87. Multiple creases 811 are divided into inner creases 8111 and outer creases 8112. These inner creases 8111 and outer creases 8112 are alternately arranged along the unfolding direction of the protective cover body 81. An inner crease 8111 is located between two adjacent outer creases 8112, and the inner crease 8111 is located inside the outer crease 8112. An inner layer support ring 86 is provided at the inner layer crease 8111, and an outer layer support ring 87 is provided at the outer layer crease 8112.

[0078] The inner support ring 86 at the inner crease 8111 and the outer support ring 87 at the outer crease 8112 can share the stress when the protective cover body 81 is folded, reducing the risk of tearing and permanent deformation.

[0079] Moreover, the alternating inner crease 8111 and outer crease 8112 form a "preset trajectory". The inner crease 8111 and outer crease 8112 form a bidirectional guide, which can limit the shield body 81 to bend along the preset trajectory, making the folding trajectory more accurate and avoiding the deviation and distortion caused by a single crease 811 (only the inner crease 8111 or the outer crease 8112). This is conducive to the shield body 81 quickly restoring the preset shape after unfolding, avoiding wrinkle residue, and is more conducive to the integrity of the protective space of the shield body 81.

[0080] In other embodiments, the crease 811 may be either an inner crease 8111 or an outer crease 8112. An inner support ring 86 may be embedded at the inner crease 8111, and an outer support ring 87 may be embedded at the outer crease 8112.

[0081] In one embodiment, both the inner support ring 86 and the outer support ring 87 are metal wire rings, which are low in cost and lightweight in structure. Specifically, the metal wire rings are formed by stringing together steel wires.

[0082] In other embodiments, the inner support ring 86 can be a U-shaped inner connecting plate, which is formed by splicing three sequentially connected plate frame edges. The inner connecting plate can be a plastic plate and can be sewn into the inner fold 8111 of the protective cover body 81. The outer support ring 87 can be a U-shaped outer connecting plate, which is formed by splicing three sequentially connected plate frame edges. The outer connecting plate can be a plastic plate and can be sewn into the outer fold 8112 of the protective cover body 81.

[0083] In other embodiments, the skeleton may include multiple metal wires, with multiple metal wires embedded and fixed at each crease 811.

[0084] In one embodiment, such as Figure 2 and Figure 3 As shown, the seat leg support mechanism also includes a leg support cover 7 and a leg support foam layer 6. The leg support foam layer 6 is located on top of the leg support air bag assembly 5. The leg support cover 7 is fitted over the leg support foam layer 6. The other side of the cover body 81 is connected to the leg support cover 7. The cover body 81 isolates the leg support air bag assembly 5 from the outside world, protects and conceals the leg support air bag assembly 5, and prevents external damage to the leg support air bag assembly 5.

[0085] In other embodiments, the other side of the shield body 81 can be fixedly connected to the leg support plate 3, so that the shield body 81 is only used for protection and concealing the lifting airbag assembly 4.

[0086] In other embodiments, the leg support airbag assembly 5 may include a first leg support airbag and two second leg support airbags. The size of the first leg support airbag is larger than that of the second leg support airbags. The inflation height of the first leg support airbag is consistent throughout. The two second leg support airbags are stacked on opposite sides of the top surface of the first leg support airbag. The area on the first leg support airbag between the two second leg support airbags is used to support the legs. The two second leg support airbags are used to wrap around the sides of the legs.

[0087] At this time, the first leg supporting air bag and the second leg supporting air bag can be independent air bags, or the first leg supporting air bag and the second leg supporting air bag can be connected to form a twin air bag.

[0088] In addition, one embodiment of the invention also provides a seat leg support mechanism, the structure of which is the same as that of the seat leg support mechanism in any of the above embodiments, and will not be described again here.

[0089] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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. Such 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, and should all be included within the protection scope of the present invention.

Claims

1. A seat leg support mechanism, characterized in that, It includes a leg support plate, a leg support mounting plate, a lifting air bag assembly, and a leg support air bag assembly. The leg support mounting plate is used to fix it to the seat frame. One side of the leg support plate is hinged to the leg support mounting plate. The leg support plate can be rotated relative to the leg support mounting plate around the hinge point. The lifting airbag assembly includes at least two layers of lifting airbags, which are stacked between the leg support plate and the leg support mounting plate. The lifting airbags are inflated to push the leg support plate to flip outward. The leg support airbag assembly is located on the side of the leg support plate opposite to the leg support mounting plate.

2. The seat leg support mechanism according to claim 1, characterized in that, The lifting airbag assembly includes at least three layers of lifting airbags, which are stacked between the leg support plate and the leg support mounting plate. The at least three layers of lifting airbags are divided into a bottom airbag, a top airbag, and a middle airbag. The bottom airbag is fixed to the leg support mounting plate, the top airbag is fixed to the leg support plate, and the middle airbag is fixed between the bottom airbag and the top airbag.

3. The seat leg support mechanism according to claim 1, characterized in that, The seat leg support mechanism also includes a tension spring, one end of which is connected to the leg support support plate and the other end of which is connected to the leg support mounting plate; when the lifting air bag is inflated, the leg support support plate flips outward against the tension of the tension spring.

4. The seat leg support mechanism according to claim 3, characterized in that, The leg support plate is provided with a plurality of first hooks, which are spaced apart along a first direction. The side of the leg support mounting plate corresponding to the first hooks is provided with a plurality of second hooks. One end of the tension spring is selectively hooked onto any one of the first hooks, and the other end of the tension spring is selectively hooked onto any one of the second hooks.

5. The seat leg support mechanism according to claim 3, characterized in that, The seat leg support mechanism also includes a torsion spring. One side of the leg support support plate is rotatably connected to the leg support mounting plate via a pivot. The torsion spring is sleeved on the pivot. One end of the torsion spring is connected to the leg support support plate, and the other end of the torsion spring is connected to the leg support mounting plate.

6. The seat leg support mechanism according to claim 1, characterized in that, A connecting part is provided on one side of the leg support plate, and the connecting part has a limiting block that protrudes outward along a first direction; The connecting part is rotatably connected to the leg support mounting plate. The leg support mounting plate is provided with a limiting groove, and the limiting groove has an opening facing the leg support support plate. When the leg support support plate is flipped outward to a set angle, the limiting block is located in the limiting groove, and the side wall of the limiting groove can restrict the limiting block from continuing to rotate.

7. The seat leg support mechanism according to claim 1, characterized in that, The lifting airbag assembly and the leg support airbag assembly are inflated by different air sources.

8. The seat leg support mechanism according to claim 1, characterized in that, The leg support airbag assembly includes a leg support airbag having two vertical welds spaced apart along a second direction, the vertical welds extending along a third direction, the two vertical welds dividing the leg support airbag into a central block and two side blocks, the central block being located between the two side blocks in the second direction; The central block has at least two transverse welds spaced apart along the third direction, the transverse welds extending along the second direction, and the at least two transverse welds dividing the central block into multiple sub-blocks; the cross-sectional area of ​​the side block is larger than the cross-sectional area of ​​the sub-blocks, and the sub-blocks are connected to the side block; wherein, the second direction is perpendicular to the third direction on the cross-section of the leg support air bag.

9. The seat leg support mechanism according to any one of claims 1 to 8, characterized in that, The seat leg support mechanism also includes a folding cover, which includes a cover body. The cover body has multiple folds distributed along the flipping direction of the leg support plate. One side of the cover body is connected to the leg support mounting plate, and the other side of the cover body is fixed relative to the leg support plate. The leg support plate can flip between a folded position and an unfolded position relative to the leg support mounting plate. In the folded position, the lifting airbag is deflated, the leg support plate is attached to the leg support mounting plate, and the cover body is folded along the crease. When the leg support plate flips to the unfolded position, an opening is formed between the leg support plate and the leg support mounting plate. The leg support plate drives the cover body to unfold, and the cover body closes the opening.

10. The seat leg support mechanism according to claim 9, characterized in that, The protective cover body includes a cover end enclosure and two cover side enclosures. The two cover side enclosures are spaced apart along the hinge axis of the leg support plate. The cover end enclosure connects the outer edge of the two cover side enclosures, and the cover end enclosure and the two cover side enclosures form a U-shaped structure.

11. The seat leg support mechanism according to claim 10, characterized in that, The folding cover also includes an upper connecting frame and a lower connecting frame, which are U-shaped. The upper connecting frame is connected to the outer periphery of the cover body near the leg support plate, and the lower connecting frame is connected to the outer periphery of the cover body near the leg support mounting plate. The upper connecting frame is connected to the leg support plate, and the lower connecting frame is connected to the leg support mounting plate.

12. The seat leg support mechanism according to claim 9, characterized in that, The folding shield also includes a frame, which is embedded and fixed at the fold.

13. The seat leg support mechanism according to claim 12, characterized in that, The frame includes an inner support ring and an outer support ring. The multiple creases are divided into inner creases and outer creases. The multiple inner creases and multiple outer creases are arranged alternately along the unfolding direction of the protective cover body. An inner crease is arranged between two adjacent outer creases. The inner crease is located inside the outer crease. The inner layer support ring is provided at the inner layer crease, and the outer layer support ring is provided at the outer layer crease.

14. The seat leg support mechanism according to claim 9, characterized in that, The seat leg support mechanism also includes a leg support cover and a leg support foam layer. The leg support foam layer is located on top of the leg support air bag assembly. The leg support cover is fitted over the leg support foam layer. The other side of the protective cover body is connected to the leg support cover. The protective cover body isolates the leg support air bag assembly from the outside world.

15. A type of seat, characterized in that, It includes a seat frame and a seat leg support mechanism as described in any one of claims 1 to 14.

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