Zero-pressure seat with leg supports capable of being unfolded in linkage mode

Abstract

The utility model relates to a zero-pressure seat with a leg support capable of being unfolded in a linkage mode, which comprises a base assembly, a cushion assembly, a leg support assembly, a zero-pressure connecting rod assembly, a zero-pressure motor and a leg support connecting rod assembly. One end of the zero-pressure motor is hinged to the base assembly, the other end of the zero-pressure motor is hinged to the zero-pressure connecting rod assembly, the zero-pressure connecting rod assembly is driven by the zero-pressure motor to move so as to drive the cushion assembly to achieve zero-pressure posture adjustment, and the leg support assembly is connected to the front end of the cushion assembly in a turnover mode through the leg support connecting rod assembly. The zero-pressure seat further comprises a linkage connecting rod assembly connected with the zero-pressure connecting rod assembly and the leg support connecting rod assembly, the linkage connecting rod assembly is used for driving the leg support connecting rod assembly to move when the zero-pressure connecting rod assembly is driven to move, and then overturning movement of the leg support assembly during zero-pressure posture adjustment is achieved. Zero pressure and linkage unfolding of the leg support can be realized by adopting one set of driving motor, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to a zero-pressure seat with a leg rest that can be extended in conjunction with the seat. Background Technology

[0002] Currently, most mainstream zero-pressure seats require separate drives for zero-pressure mode and leg rest deployment. Two sets of drive motors undoubtedly increase the drive cost and occupy a large space. Therefore, a drive mechanism that can realize the coordinated deployment of zero pressure and leg rest is needed. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a zero-pressure seat with a linked unfolding leg rest. A single drive motor is sufficient to achieve the linked unfolding of the zero-pressure seat and the leg rest, thereby reducing costs.

[0004] This utility model is achieved through the following scheme: a zero-pressure seat with a linked unfoldable leg rest, including a base assembly, a seat cushion assembly, a leg rest assembly, a zero-pressure linkage assembly, a zero-pressure motor, and a leg rest linkage assembly. The seat cushion assembly is movably connected to the upper part of the base assembly via the zero-pressure linkage assembly. One end of the zero-pressure motor is hinged to the base assembly, and the other end is hinged to the zero-pressure linkage assembly. The zero-pressure motor drives the zero-pressure linkage assembly to move, thereby enabling the seat cushion assembly to achieve zero-pressure posture adjustment. The leg rest assembly is connected to the base cushion assembly via the zero-pressure linkage assembly. The linkage assembly is rotatably connected to the front end of the seat cushion assembly. The zero-pressure seat also includes a linkage assembly connecting the zero-pressure linkage assembly and the leg support linkage assembly. This linkage assembly is used to drive the leg support linkage assembly to move when the zero-pressure linkage assembly is driven, thereby realizing the flipping movement of the leg support assembly during zero-pressure posture adjustment. The linkage assembly includes a first link fixed to the zero-pressure linkage assembly, a second link fixed to the leg support linkage assembly, and a third link hinged between the first link and the second link.

[0005] A further improvement of this utility model is that: the number of the linkage assemblies is two, and the two linkage assemblies are symmetrically arranged between the zero-pressure linkage assembly and the leg support linkage assembly.

[0006] A further improvement of this utility model is that a third reinforcing rod is fixedly connected between the third connecting rods in the two linkage assemblies.

[0007] A further improvement of this utility model is that: the seat cushion assembly includes two wall panels located on both sides, and a front upper tube and a rear tube respectively connected to the front and rear ends of the two wall panels; a leg support mounting plate for hinged connection of the leg support linkage assembly is fixed on the front upper tube.

[0008] A further improvement of this utility model is that: the zero-pressure linkage assembly includes two sets of front upper linkages, front lower linkages and rear linkages respectively corresponding to the two wall panels; one end of the front upper linkage rotates relative to the front end of the seat cushion assembly, and the other end is hinged to one end of the front lower linkage; the front lower linkage is hinged to the base assembly; one end of the rear linkage rotates relative to the rear end of the seat cushion assembly, and the other end is hinged to the base assembly.

[0009] A further improvement of this utility model is that the middle part of the front lower connecting rod is hinged to the base assembly; the other end of the zero-voltage motor is hinged to the other end of the front lower connecting rod so as to drive the two ends of the front lower connecting rod to rotate in opposite directions relative to the base assembly.

[0010] A further improvement of this utility model is that the zero-pressure connecting rod assembly further includes a front lower tube that is fixedly connected to the two front lower connecting rods respectively, and the front lower tube is aligned with the hinge point between the front lower connecting rod and the base assembly.

[0011] A further improvement of this utility model is that one end of the first connecting rod is fixedly connected to the front lower tube, and the other end is hinged to the third connecting rod.

[0012] A further improvement of this utility model is that: the other end of the lower front connecting rod is hinged to the base assembly, and the other end of the zero-voltage motor is hinged to the middle of the lower front connecting rod, so as to drive the end of the lower front connecting rod that is hinged to the upper front connecting rod to rotate relative to the base.

[0013] A further improvement of this utility model is that: one end of the first connecting rod is fixedly connected to the lower front connecting rod, and the fixing point is spaced a certain distance from the other end of the lower front connecting rod; the other end of the first connecting rod is hinged to the third connecting rod.

[0014] A further improvement of this utility model is that: a leg support interface bracket is fixed on the leg support mounting plate; the leg support linkage assembly includes an active two-link, a passive two-link, and a driving link; the two free ends of the active two-link are respectively hinged to the front end of the leg support interface bracket and the front end of the leg support assembly; the two free ends of the passive two-link are respectively hinged to the rear end of the leg support interface bracket and the rear end of the leg support assembly; and the active rear link of the active two-link and the passive front link of the passive two-link are cross-hinged to form a foldable link group; the driving link is fixed to the active rear link of the active two-link; and the second link is fixed to the driving link.

[0015] This invention connects the zero-pressure linkage assembly and the leg support linkage assembly through a linkage assembly, and uses a zero-pressure motor for driving to achieve the coordinated unfolding of the seat cushion assembly and the leg support assembly. Through the installation position and linkage of the zero-pressure linkage assembly and the leg support linkage assembly, the opening angle of the leg support assembly and the seat cushion assembly can change with time and cooperate with each other. Thus, the leg support unfolds synchronously while the seat is in zero-pressure mode, without the need for a separate motor to drive the leg support, which greatly reduces costs. Moreover, the load range of the zero-pressure motor is dispersed, and the motor power requirement is small. Attached Figure Description

[0016] Figure 1 A side view of the seat assembly of this utility model is shown.

[0017] Figure 2 This invention presents a three-dimensional structural diagram of the seat cushion assembly in its initial posture.

[0018] Figure 3 This invention presents a three-dimensional structural diagram of the seat cushion assembly in a zero-pressure posture.

[0019] Figure 4 An exploded assembly view of the zero-pressure connecting rod assembly and the zero-pressure motor in this utility model is shown.

[0020] Figure 5 This diagram shows the assembly state of the zero-pressure connecting rod assembly and the zero-pressure motor in this invention.

[0021] Figure 6 This diagram shows the assembly state of the leg support assembly and the leg support connecting rod assembly in this utility model.

[0022] Figure 7 An exploded assembly view of the leg support connecting rod assembly of this utility model is shown.

[0023] Figure 8 The diagram shows a comparison of the postures of the leg support assembly before and after flipping.

[0024] Figure 9 The diagram shows the assembly state of the first embodiment of the linkage assembly, the zero-pressure linkage assembly, and the leg support linkage assembly of this utility model.

[0025] Figure 10 This diagram shows the assembly state of the first embodiment of the linkage assembly in this utility model.

[0026] Figure 11 An exploded assembly view of the first embodiment of the linkage assembly of this utility model is shown.

[0027] Figure 12The diagram shows a comparison of the postures of the first embodiment of the linkage assembly of this utility model before and after linkage deployment.

[0028] Figure 13 The diagram shows the posture of the seat assembly before and after linkage deployment, implemented using the first embodiment of the linkage linkage assembly of this utility model.

[0029] Figure 14 The diagram illustrates the operating principle of the seat assembly before and after linkage deployment, implemented using the first embodiment of the linkage linkage assembly of this utility model.

[0030] Figure 15 The diagram shows the assembly state of the second embodiment of the linkage assembly and a portion of the zero-pressure linkage assembly in this utility model.

[0031] In the diagram: 1. Base assembly; 11. Slide rail; 12. Slide rail bracket; 121. Front support leg; 122. Rear support leg; 2. Seat cushion assembly; 21. Wall panel; 22. Front upper tube; 23. Rear tube; 24. Leg rest mounting plate; 25. First reinforcing rod; 26. Leg rest interface bracket; 27. Second reinforcing rod; 3. Backrest assembly; 4. Leg rest assembly; 5. Zero-pressure linkage assembly; 51. Front upper linkage; 51a. First connection point of front upper linkage; 51b. Second connection point of front upper linkage; 52. Rear linkage; 52a. First connection point of rear linkage; 52b. Second connection point of rear linkage; 53. Front lower linkage; 54. Front lower tube; 6. Zero-pressure motor; 6a. First connection point of motor; 6 b. Second connection point of the motor; 7. Leg support linkage assembly; 71. Active second linkage; 711. Active rear linkage; 71a. First connection point of the active second linkage; 71b. Second connection point of the active second linkage; 72. Passive second linkage; 721. Passive front linkage; 72a. First connection point of the passive second linkage; 72b. Second connection point of the passive second linkage; 73. Drive linkage; 7x. Cross hinge point; 8. Linkage linkage assembly; 81. First linkage; 81a. Fixing point; 82. Second linkage; 83. Third linkage; 83a. First connection point of the third linkage; 83b. Second connection point of the third linkage; 84. Third reinforcing rod; 85. Mounting bolt; 86. Rivet. Detailed Implementation

[0032] To address the high costs associated with existing zero-pressure seats that require separate driving for zero-pressure posture and leg rest rotation, this invention provides a zero-pressure seat with a linked unfolding leg rest. A single drive motor enables the linked unfolding of both zero-pressure posture and leg rest, reducing costs. The following detailed description, in conjunction with accompanying drawings, further illustrates this zero-pressure seat with a linked unfolding leg rest. To more clearly illustrate the structure and principle of the zero-pressure seat, its orientation is defined as follows: the front of the vehicle faces forward, the rear faces backward, and the wheels are pointing downwards. Specifically, the front and rear positions of the zero-pressure seat correspond to the vehicle's forward and reverse directions, respectively, while the up, down, left, and right positions refer to the up, down, left, and right positions in the front-to-back direction of the zero-pressure seat.

[0033] First embodiment, see reference Figures 1 to 14 As shown, a zero-pressure seat with a linked unfoldable leg rest includes a base assembly 1, a seat cushion assembly 2, a backrest assembly 3, a leg rest assembly 4, a zero-pressure linkage assembly 5, a zero-pressure motor 6, and a leg rest linkage assembly 7. The backrest assembly 3 and the seat cushion assembly 2 are usually relatively independent structures, and the two can rotate relative to each other. The seat cushion assembly 2 is movably connected to the top of the base assembly 1 through the zero-pressure linkage assembly 5. One end of the zero-pressure motor 6 is hinged to the base assembly 1, and the other end is hinged to the zero-pressure linkage assembly 5. The zero-pressure motor 6 drives the zero-pressure linkage assembly 5 to move, thereby enabling the seat cushion assembly 2 to achieve zero-pressure posture adjustment. The leg rest assembly 4 is rotatably connected to the front end of the seat cushion assembly 2 through the leg rest linkage assembly 7. The zero-pressure seat also includes a linkage assembly 8 connecting the zero-pressure linkage assembly 5 and the leg support linkage assembly 7. When the zero-pressure linkage assembly 5 is driven to move, the leg support linkage assembly 7 moves along with the movement of the zero-pressure linkage assembly 5, thereby realizing the flipping movement of the leg support assembly 4 during zero-pressure posture adjustment. The linkage assembly 8 includes a first link 81 fixed to the zero-pressure linkage assembly 5, a second link 82 fixed to the leg support linkage assembly 7, and a third link 83 hinged between the first link 81 and the second link 82.

[0034] As a preferred implementation method, see [link / reference] Figures 2-5 and Figure 9 As shown, the seat assembly 2 includes two side panels 21 located on the left and right sides relative to the front-rear direction, a front upper tube 22 pivotally connected between the front ends of the two side panels 21, and a rear tube 23 pivotally connected between the rear ends of the two side panels 21. The two side panels 21, the front upper tube 22, and the rear tube 23 form a seat frame structure for occupants to sit on. To improve seating comfort, a seat basin is usually provided between the two side panels 21. Furthermore, a leg support mounting plate 24 for hinged connection of the leg support linkage assembly 7 is fixed to the front upper tube 22, so as to facilitate the movable mounting of the leg support assembly 4 to the front of the seat assembly 2.

[0035] The base assembly 1 includes two slide rails 11 located below the two wall panels 21 and two slide rail brackets 12 fixed on the upper rails of the two slide rails 11 respectively. Each slide rail bracket 12 has a front support leg 121 and a rear support leg 122 respectively corresponding to the front and rear ends of the seat assembly 2.

[0036] The zero-pressure linkage assembly 5 includes two linkage components respectively disposed on the two wall panels 21. Each linkage component is movably connected between the wall panel 21 and the slide rail bracket 12 on the same side. Specifically, each linkage component includes a front upper linkage 51, a front lower linkage 53, and a rear linkage 52. One end of the front upper linkage 51 is rotatably disposed relative to the front end of the seat cushion assembly 2. In this embodiment, one end of the front upper linkage 51 is pivotally connected to the front part of the wall panel 21 on the corresponding side. In other embodiments, the relative rotation of one end of the front upper linkage 51 with the seat cushion assembly 2 can also be achieved through the front upper tube 22. For example, the front upper tube 22 can be pivotally connected to the wall panel 21, and the front upper linkage 51 can be fixedly connected to the front upper tube 22. Alternatively, the front upper tube 22 can be fixedly connected to the wall panel 21, and the front upper linkage 51 can be rotatably connected to the front upper tube 22. The other end of the upper front connecting rod 51 is pivotally connected to one end of the lower front connecting rod 53. The lower front connecting rod 53 is pivotally connected to the inner side of the front support leg 121 of the corresponding slide rail bracket 12. One end of the rear connecting rod 52 is rotatably connected to the seat cushion assembly 2. In this embodiment, one end of the rear connecting rod 52 is fixed to the rear tube 23, and the relative rotation with the seat cushion assembly 2 is achieved by the pivot connection between the rear tube 23 and the wall panel 21. In other embodiments, the relative rotation with the seat cushion assembly 2 can also be achieved by directly pivoting one end of the rear connecting rod 52 to the wall panel 21, or by changing the connection between the rear tube 23 and the wall panel 21 to a fixed connection, while one end of the rear connecting rod 52 is pivotally connected to the rear tube 23. The other end of the rear connecting rod 52 is pivotally connected to the rear support legs 122 of the two slide rail brackets 12 respectively.

[0037] In this embodiment, there is one zero-voltage motor 6, located between the slide rail 11 and the wall panel 21 on one side, and capable of telescopic movement along the extension direction of the slide rail 11, driving the corresponding linkage assembly to move through its telescopic movement. Specifically, as follows... Figure 5As shown, one end of the zero-voltage motor 6 is pivotally connected to the rear support leg 122 of the slide rail bracket 12 on the corresponding side. The rear support leg 122 is provided with a first motor connection point 6a for pivoting one end of the zero-voltage motor 6. The other end of the zero-voltage motor 6 is pivotally connected to the front lower link 53 in the connecting rod assembly on the corresponding side. The front lower link 53 is provided with a second motor connection point 6b for pivoting the other end of the zero-voltage motor 6, a second front upper link connection point 51b for pivoting the other end of the front upper link 51 in the connecting rod assembly, and a front lower link connection point 53a for pivoting to the front support leg 121. The second front upper link connection point 51b and the second motor connection point 6b are located on opposite sides of the front lower link connection point 53a, so that when the zero-voltage motor 6 drives the front lower link 53 to move through telescopic movement, the second front upper link connection point 51b and the second motor connection point 6b rotate in opposite directions relative to the base assembly 1. The other link assembly only needs to have a second connection point 51b for pivoting the other end of the corresponding upper link 51 and a connection point 53a for pivoting to the corresponding lower support leg 121. Preferably, to improve the stability of the zero-pressure link assembly 5, the zero-pressure link assembly 5 also includes a lower front tube 54 fixedly connected to the two lower front links 53 respectively. Preferably, the lower front tube 54 is aligned with the lower front link connection point 53a. In this embodiment, the two ends of the lower front tube 54 pass through and fix the two lower front links 53 respectively, and are pivotally connected to the two front supports 121 at the protruding ends. The lower front tube 54 can also be used to fix the first link 81. Of course, this embodiment only sets one zero-pressure motor 6. For applications with higher drive requirements, two zero-pressure motors 6 can also be set. The two zero-pressure motors 6 can be symmetrically installed between the slide rails 11 and the wall panel 21 on both sides using the above connection method. The extension and retraction movement of the two zero-pressure motors 6 drives the link assemblies on both sides to move. It is only necessary to set the first motor connection point 6a on the rear support leg 122 of both slide rail brackets 12, and set the second motor connection point 6b on both front lower connecting rods 53.

[0038] With the above structure, when the zero-pressure motor 6 performs its telescopic movement, a driving force is applied to the lower front link 53 through the second connection point 6b of the motor, causing the lower front link 53 to rotate relative to the base assembly 1. On one hand, the lower front link 53 can drive the upper front link 51 to swing through the second connection point 51b of the upper front link, thereby raising and lowering the front end of the seat cushion assembly 2, and thus cooperating with the seat assembly to achieve zero-pressure posture adjustment. On the other hand, the lower front tube 54 drives the first link 81 to link with the leg support link assembly 7, thereby realizing the retraction and expansion of the leg support assembly 4. Therefore, this embodiment can achieve the linkage and expansion of zero pressure and leg support using only one drive motor.

[0039] As a preferred implementation method, see [link / reference] Figures 6-9As shown, a leg support interface bracket 26 is fixed on the leg support mounting plate 24. The leg support linkage assembly 7 includes an active double link 71, a passive double link 72, and a drive link 73. The two free ends of the active double link 71 are respectively hinged to the front end of the leg support interface bracket 26 and the front end of the leg support assembly 4. The two free ends of the passive double link 72 are respectively hinged to the rear end of the leg support interface bracket 26 and the rear end of the leg support assembly 4. Furthermore, the active rear link 711 of the active double link 71 and the passive front link 721 of the passive double link 72 are cross-hinged (e.g., ...). Figure 9 The cross hinge point 7x shown forms a foldable linkage group. The drive linkage 73 is fixed to the active rear linkage 711 of the active second linkage 71, and the second linkage 82 is fixed to the drive linkage 73. In order to make the extension and retraction of the leg support assembly 4 more stable, in this embodiment, there are two leg support mounting plates 24, which are fixed at intervals on the front upper tube 22. There are two foldable linkage groups, which are correspondingly connected between the two leg support interface brackets 26 on both sides of the leg support assembly 4. The two ends of the drive linkage 73 are respectively fixed to the two foldable linkage groups. Furthermore, to increase the connection stability of the two leg support mounting plates 24, a first reinforcing rod 25 is fixed between the two leg support mounting plates 24. The leg support interface bracket 26 is arranged parallel to the lower front side of the upper tube 22. To further increase the connection stability of the two leg support interface brackets 26, a second reinforcing rod 27 is fixed between the two leg support interface brackets 26. The second reinforcing rod 27 is arranged parallel to the lower front side of the first reinforcing rod 25. Through the arrangement of the leg support interface bracket 26, the leg support linkage assembly 7 has sufficient connection space. The first connection point 71a of the active dual linkage 71 is provided on the upper front side of the second reinforcing rod 27 on the leg support interface bracket 26 for pivoting the active dual linkage 71. The first connection point 72a of the passive dual linkage 72 is provided on the lower rear side of the second reinforcing rod 27 on the leg support interface bracket 26 for pivoting the passive dual linkage 72. When the leg support interface bracket 26 rises and falls with the front upper tube 22, the active dual linkage 71 and the passive dual linkage 72 will drive the leg support assembly 4 to rise and fall. The drive linkage 73, driven by the second linkage 82, will cause the active dual linkage 71 to swing up and down. Since the active dual linkage 71 and the passive dual linkage 72 are pivotally connected at the cross hinge point 7x, the swinging of the active dual linkage 71 will drive the swinging of the passive dual linkage 72, thereby realizing the extension and folding of the foldable linkage group, and thus driving the leg support assembly 4 to unfold and retract. Specifically, as follows... Figure 8 As shown, Figure 8 Figure (a) shows the retracted state of the leg support assembly 4 before it is flipped over, and Figure (b) shows the unfolded state of the leg support assembly 4 after it is flipped over.

[0040] Preferably, due to the setting of the second reinforcing rod 27, the swing space of the second link 82 may be partially obstructed. In order to ensure that the second link 82 is not obstructed by the second reinforcing rod 27 and the leg support assembly 4 when swinging, in this embodiment, the drive link 73 is set as a "U"-shaped structure with the middle section higher than the two end sections, and the third link 83 is fixed to the middle section of the drive link 73. The height difference between the middle section and the end sections allows the third link 83 to avoid the second reinforcing rod 27 and the leg support assembly 4 when swinging.

[0041] As a preferred implementation method, see [link / reference] Figures 9-12 As shown, the rear end of the first link 81 in the linkage assembly 8 is fixed to the front lower tube 54 by welding, and an arc-shaped groove adapted to the outer periphery of the front lower tube 54 is formed at the weld. Similarly, the front end of the second link 82 is fixed to the drive link 73 by welding, and an arc-shaped groove adapted to the outer periphery of the drive link 73 is formed at the weld. The rear end of the third link 83 is pivotally connected to the first link 81 by a mounting bolt 85, and the front end of the third link 83 is pivotally connected to the second link 82 by a rivet 86. The pivoting method mentioned in the above embodiments can be either screwed or riveted, that is, it can be achieved using mounting bolts 85 or rivets 86. Preferably, there are two linkage assemblies 8, symmetrically arranged between the zero-pressure linkage assembly 5 and the leg support linkage assembly 7. A third reinforcing rod 84 is fixedly connected between the third link 83 of the two linkage assemblies 8, enhancing the overall stability of the linkage assembly 8. The linkage assemblies 8 connect the zero-pressure linkage assembly 5 and the leg support linkage assembly 7, driven by a zero-pressure motor, to achieve the coordinated unfolding of the seat cushion assembly 2 and the leg support assembly 4. Furthermore, through the installation positions and coordinated operation of the zero-pressure linkage assembly 5, the leg support linkage assembly 7, and the linkage assembly 8, the opening angles of the leg support assembly 4 and the seat cushion assembly 2 can change over time, thus enabling the leg support to unfold synchronously while the seat is in zero-pressure mode. Specifically... Figure 12 As shown, Figure 12 Figure (a) shows the state of the linkage assembly 8 before the linkage is deployed, and Figure (b) shows the state of the linkage assembly 8 after the linkage is deployed. Figure 13 As shown, Figure 13 Figure (a) shows the state of the seat assembly before it is deployed, and Figure (b) shows the state of the seat assembly after it is deployed.

[0042] Regarding the overall linkage principle of the seat assembly of this utility model, in conjunction with... Figure 14 As shown, Figure 14Figure (a) shows the position of each key connection point before the linkage is deployed, and Figure (b) shows the position of each key connection point after the linkage is deployed. The key connection points include: the first connection point 52a and the second connection point 52b of the rear link 52 between the rear link 52 and the seat assembly 2 and the base assembly 1, respectively; the first connection point 6a and the second connection point 6b of the zero-voltage motor 6 between the base assembly 1 and the front lower link 53, respectively; the first connection point 51a and the second connection point 51b of the front upper link 51 between the seat assembly 2 and the front lower link 53, respectively; and the third link 83 between the first link 81 and the second link 52a. The first connection point 83a and the second connection point 83b of the third link between the two links 82; the first connection point 71a and the second connection point 71b of the active two links 71 between the leg support interface bracket 26 and the leg support assembly 4; the first connection point 72a and the second connection point 72b of the passive two links 72 between the leg support interface bracket 26 and the leg support assembly 4; and the 7x connection between the active two links 71 and the passive two links 72, etc. Taking the change from Figure (a) to Figure (b) as an example, the changes of each component and the corresponding key connection points are as follows:

[0043] When the zero-pressure motor 6 extends, the lower front link 53 swings under the action of the second connection point 6b of the motor. As the lower front link 53 swings, two aspects of linkage will occur simultaneously: First, under the action of the second connection point 51b and the first connection point 51a of the upper front link, the upper front link 51 lifts the front end of the seat cushion assembly 2. Under the linkage of the rear link 52, the rear end of the seat cushion assembly 2 sinks, and the tilt angle of the seat cushion assembly 2 increases. At this time, in conjunction with the relative rotation of the backrest assembly 3, the zero-pressure posture adjustment of the seat assembly can be realized. Secondly, as the front end of the seat cushion assembly 2 rises, the leg support interface bracket 26 will drive the leg support linkage assembly 7 (including the active double linkage 71, the passive double linkage 72, and the drive linkage 73) and the leg support assembly 4 to rise. Simultaneously, since the front lower tube 54 is fixed to the front lower linkage 53, and the first linkage 81 is fixed to the front lower tube 54, when the front lower linkage 53 swings, the linkage assembly 8 (including the first linkage 81, the second linkage 82, and the third linkage 83) will be linked, thereby driving the active double linkage 71 to swing. Under the action of the cross hinge point 7x, the passive double linkage 72 is linked with the active double linkage 71, causing the leg support linkage assembly 7 to push the leg support assembly 4 upward while simultaneously unfolding it. When the seat cushion assembly 2 is raised into position, the leg support assembly 4 also rises and unfolds into position, as shown in Figure (b).

[0044] Second embodiment, see Figure 15 and cooperate Figure 5As shown, the main difference between this embodiment and the first embodiment lies in the connection structure between the linkage assembly 8 and the zero-pressure linkage assembly 5. In this embodiment, each linkage assembly has a front lower linkage 53 with a front upper linkage second connection point 51b for pivoting the other end of the front upper linkage and a front lower linkage connection point 53a for pivoting to the front support leg 121. For the front lower linkage 53 with the zero-pressure motor 6 on the same side, a motor second connection point 6b for pivoting the other end of the zero-pressure motor 6 is further provided. However, unlike the first embodiment, the front upper linkage second connection point 51b and the front lower linkage connection point 53a are located on opposite sides of the motor second connection point 6b, so that when the zero-pressure motor 6 drives the front lower linkage 53 to move through the telescopic movement, the front upper linkage second connection point 51b rotates relative to the base assembly 1, and the axis of rotation passes through the front lower linkage connection point 53a. In the case of only one zero-voltage motor 6, the lower front link 53 in the other linkage assembly only needs to be provided with a second connection point 51b for the other end of the corresponding upper front link 51 to pivotally connect, and a lower front link connection point 53a for pivotally connecting to the corresponding front support leg 121. In the case of two zero-voltage motors 6, the lower front links 53 in the two linkage assemblies have a symmetrical structure. Furthermore, in this embodiment, one end of the first link 81 in the linkage assembly 8 is directly fixedly connected to the lower front link 53, and the fixing point 81a between them is spaced a certain distance from the lower front link connection point 53a. The other end of the first link 83 is pivotally connected to the third link 83.

[0045] With the above structure, when the zero-pressure motor 6 performs telescopic movement, a driving force is applied to the lower front link 53 through the second connection point 6b of the motor, causing the lower front link 53 to rotate relative to the base assembly 1. On one hand, the lower front link 53 can drive the upper front link 51 to swing through the second connection point 51b of the upper front link, thereby raising and lowering the front end of the seat cushion assembly 2, and thus cooperating with the seat assembly to achieve zero-pressure posture adjustment. On the other hand, the lower front link 53 can drive the first link 81 to rotate through the fixed point 81a, thereby raising or lowering it, and thus linking the leg support link assembly 7 to achieve the retraction and expansion of the leg support assembly 4. Preferably, in the case where two linkage links assemblies 8 need to be set, the first link 81 of the two linkage links assemblies 8 can be connected as a single piece, such as... Figure 15 As shown, both ends of the integrated component are fixed to the two front lower connecting rods 53 respectively. By connecting the two first connecting rods 81 into an integrated component, the front lower tube can be used as a support between the two front lower connecting rods 53. Compared with the first embodiment, this embodiment does not require an additional front lower tube to ensure the stability of the entire zero-pressure connecting rod assembly 5.

[0046] This invention uses a single drive motor to achieve the coordinated unfolding of the zero-pressure motor and the leg support, eliminating the need for a separate motor to drive the leg support, which greatly reduces costs. Furthermore, the load range of the zero-pressure motor is dispersed, requiring less motor power and further reducing drive costs.

[0047] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A zero-pressure seat with a retractable leg rest, comprising a base assembly, a seat cushion assembly, a leg rest assembly, a zero-pressure linkage assembly, a zero-pressure motor, and a leg rest linkage assembly. The seat cushion assembly is movably connected to the upper part of the base assembly via the zero-pressure linkage assembly. One end of the zero-pressure motor is hinged to the base assembly, and the other end is hinged to the zero-pressure linkage assembly. The zero-pressure motor drives the zero-pressure linkage assembly to move, thereby adjusting the seat cushion assembly to achieve zero-pressure posture. The leg rest assembly is rotatably connected to the front end of the seat cushion assembly via the leg rest linkage assembly. The seat cushion assembly is characterized in that: The zero-pressure seat also includes a linkage assembly connecting the zero-pressure linkage assembly and the leg support linkage assembly. This linkage assembly is used to drive the leg support linkage assembly to move when the zero-pressure linkage assembly is driven, thereby enabling the leg support assembly to flip during zero-pressure posture adjustment. The linkage assembly includes a first link fixed to the zero-pressure linkage assembly, a second link fixed to the leg support linkage assembly, and a third link hinged between the first link and the second link.

2. The zero-pressure seat with extendable leg rest as described in claim 1, characterized in that: There are two linkage assemblies, which are symmetrically arranged between the zero-pressure linkage assembly and the leg support linkage assembly.

3. The zero-pressure seat with extendable leg rest as described in claim 2, characterized in that: A third reinforcing rod is fixedly connected between the third links in the two linkage assemblies.

4. The zero-pressure seat with extendable leg rest as described in claim 1, characterized in that: The seat cushion assembly includes two side panels located on both sides, and a front upper tube and a rear tube connected to the front and rear ends of the two side panels, respectively. A leg support mounting plate is fixed on the upper front tube for hinged connection of the leg support linkage assembly.

5. The zero-pressure seat with extendable leg rest as described in claim 4, characterized in that: The zero-pressure linkage assembly includes two sets of front upper linkages, front lower linkages, and rear linkages respectively corresponding to the two wall panels. One end of the front upper linkage rotates relative to the front end of the seat cushion assembly, and the other end is hinged to one end of the front lower linkage. The front lower linkage is hinged to the base assembly. One end of the rear linkage rotates relative to the rear end of the seat cushion assembly, and the other end is hinged to the base assembly.

6. The zero-pressure seat with extendable leg rest as described in claim 5, characterized in that: The middle part of the front lower link is hinged to the base assembly; the other end of the zero-voltage motor is hinged to the other end of the front lower link so as to drive the two ends of the front lower link to rotate in opposite directions relative to the base assembly.

7. The zero-pressure seat with extendable leg rest as described in claim 6, characterized in that: The zero-pressure linkage assembly also includes a front lower tube that is fixedly connected to the two front lower linkages respectively, and the front lower tube is aligned with the hinge point between the front lower linkage and the base assembly.

8. The zero-pressure seat with extendable leg rest as described in claim 7, characterized in that: One end of the first connecting rod is fixedly connected to the front lower tube, and the other end is hinged to the third connecting rod.

9. The zero-pressure seat with extendable leg rest as described in claim 5, characterized in that: The other end of the lower front link is hinged to the base assembly, and the other end of the zero-voltage motor is hinged to the middle of the lower front link so as to drive the end of the lower front link that is hinged to the upper front link to rotate relative to the base.

10. The zero-pressure seat with extendable leg rest as described in claim 9, characterized in that: One end of the first connecting rod is fixedly connected to the lower front connecting rod, and the fixing point is spaced a certain distance from the other end of the lower front connecting rod. The other end of the first connecting rod is hinged to the third connecting rod.

11. The zero-pressure seat with extendable leg rest as described in claim 4, characterized in that: A leg support interface bracket is fixed on the leg support mounting plate. The leg support linkage assembly includes an active double link, a passive double link, and a drive link. The two free ends of the active double link are respectively hinged to the front end of the leg support interface bracket and the front end of the leg support assembly. The two free ends of the passive double link are respectively hinged to the rear end of the leg support interface bracket and the rear end of the leg support assembly. The active rear link of the active double link and the passive front link of the passive double link are cross-hinged to form a foldable link group. The drive link is fixed to the active rear link of the active double link, and the second link is fixed to the drive link.

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