Seat auxiliary device

Abstract

A seat auxiliary device, comprising: a first support assembly (200) and a second support assembly (300); the first support assembly (200) has a cushion part (210) and a back support mechanism (220); the back support mechanism (220) is rotatably arranged at one end of the cushion part (210), and the back support mechanism (220) pivots between an unfolded position and a folded position relative to the cushion part (210); the second support assembly (300) is arranged at the other end of the cushion part (210), the second support assembly (300) is used for supporting legs, and the second support assembly (300) pivots between a lifting position and a folding position relative to the cushion part (210). By rotating the back support mechanism (220), the adjustment range of a reclining angle of the back support mechanism (220) is increased, so that the back support mechanism (220) can better support a human back, improving the comfort of a seat. The arrangement of the second support assembly (300) can achieve lifting of the legs, thereby achieving auxiliary supporting of multiple parts of a body at the same time, further improving the comfort of the seat, and effectively reducing fatigue.

Description

Seat assist device

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 2024203139759, filed on February 20, 2024, entitled “Seat Auxiliary Device”, which is incorporated into this application in its entirety by reference.

[0003] This application refers to Chinese Patent Application No. 2024203139693, filed on February 20, 2024, entitled “Seat Auxiliary Equipment”, which is incorporated into this application in its entirety by reference. Technical Field

[0004] The present application relates to the field of auxiliary seats, and in particular to a seat auxiliary device. Background Art

[0005] When traveling on airplanes, trains, and other transportation, passengers typically have limited seat space, making it very easy for them to experience localized pain and fatigue during long rides. This is usually due to limited seat space, which results in limited support for various parts of the body, causing prolonged localized pressure and leading to localized pain and fatigue.

[0006] In the related art, most of the products used to improve the riding experience improve a single part, which cannot meet the effective support requirements of all parts of the body. Therefore, it is difficult to effectively reduce the local stress and fatigue. Summary of the Invention

[0007] The present invention provides a seat auxiliary device for solving the defects of the prior art in that the support is insufficient and the auxiliary support for multiple parts of the body cannot be satisfied at the same time.

[0008] A seat auxiliary device, used to cooperate with a seat, includes: a first support assembly, having a seat cushion portion and a back support mechanism, the back support mechanism is rotatably arranged at one end of the seat cushion portion, and the back support mechanism flips between an unfolded position and a folded position relative to the seat cushion portion; a second support assembly, arranged at the other end of the seat cushion portion, the second support assembly is used to support the legs, and the second support assembly at least partially flips between a lifting position and a folded position relative to the seat cushion portion.

[0009] The aforementioned seat assist device rotates the back support mechanism to increase the range of its recline adjustment, allowing it to better support the back and improving seat comfort. Furthermore, the second support assembly allows for leg support, providing simultaneous support for multiple body parts, further enhancing seat comfort and effectively reducing fatigue.

[0010] In some embodiments, the second support assembly includes a first support portion, a second support portion and a rotation connection mechanism, the first support portion is connected to the seat cushion portion, and the second support portion is connected to the first support portion via the rotation connection mechanism.

[0011] In some embodiments, the first support portion is retractable on the seat cushion portion.

[0012] In some embodiments, a first sliding groove is further provided in the cushion portion, and the first support portion is inserted into the first sliding groove.

[0013] In some embodiments, the first support portion includes a fixed end and a linear telescopic end, the fixed end is fixedly connected to the cushion portion, the linear telescopic end is slidably connected to the fixed end, and the rotating connection mechanism is provided at the end of the linear telescopic end.

[0014] In some embodiments, the first support portion includes a fixed end and a linear telescopic end, the linear telescopic end is slidably connected to the cushion portion, the fixed end is connected to an end of the linear telescopic end away from the cushion portion, and there is an avoidance gap between the fixed end and the linear telescopic end.

[0015] In some embodiments, the rotation connection mechanism includes: a seat body, connected to the first support part; an adjusting member, connected to the second support part, and provided on the seat body and capable of rotating around the rotation axis, the seat body being provided with a plurality of mating parts distributed around the periphery of the rotation axis; an elastic locking assembly, provided on the adjusting member, the elastic locking assembly cooperating with the mating part to limit the rotation of the adjusting member in a first direction and allowing the adjusting member to rotate in a second direction opposite to the first direction; an unlocking assembly, including a first unlocking component and a second unlocking component, both of which are provided on the adjusting member, when the adjusting member rotates to a first extreme position along the second direction, the first unlocking component is engaged with the elastic locking assembly and drives the elastic locking assembly to remain separated from the mating part, when the adjusting member rotates to the second extreme position along the first direction, the first unlocking component is separated from the elastic locking assembly so that the elastic locking assembly cooperates with the mating part; the second unlocking component is transmission-connected to the elastic locking assembly to drive the elastic locking assembly to separate from the mating part.

[0016] In some embodiments, the elastic locking assembly includes a pawl and an elastic component, the pawl is rotatably connected to the adjusting member, and one end of the pawl includes a locking end, the elastic component is connected to the pawl and the adjusting member, and is used to drive the locking end to cooperate with the mating portion, when the adjusting member is rotated to the first extreme position, the first unlocking component is engaged with the locking end and drives the locking end to remain separated from the mating portion, and when the adjusting member is rotated to the second extreme position, the first unlocking component is separated from the locking end.

[0017] In some embodiments, the base body is provided with a first guide portion and a second guide portion, the first guide portion is located at one end of all the mating portions along the second direction, and the second guide portion is located at the other end of all the mating portions, and the first unlocking component includes a first surface facing the first guide portion and a second surface facing the second guide portion; when the adjusting member is rotated to the first extreme position, the first guide portion pushes the pawl to rotate along the first direction, so that the locking end disengages from the mating portion and abuts against the second surface, and when the adjusting member is rotated to the second extreme position, the second guide portion pushes the pawl to rotate along the second direction, so that the locking end disengages from the second surface and is located on one side of the first surface.

[0018] In some embodiments, the second unlocking component includes an operating member and a transmission member. The operating member is movably disposed on the adjusting member and is connected to the elastic locking assembly through the transmission member.

[0019] In some embodiments, the second supporting portion includes a fixed connecting portion and a sliding telescopic portion, the fixed connecting portion is connected to the rotating connecting mechanism, and the sliding telescopic portion is sleeved on the fixed connecting portion so that the sliding telescopic portion can slide relative to the fixed connecting portion.

[0020] In some embodiments, a foot pedal is provided at the end of the sliding telescopic part, and the foot pedal has two parallel foot pedal support parts. The foot pedal is rotatably connected to the sliding telescopic part, and the foot pedal flips between a support position and a folded position relative to the sliding telescopic part.

[0021] In some embodiments, the cushion portion includes two main body portions, one end of each of the two main body portions is provided with a hinge seat, and the back support mechanism is connected to the main body portion via the hinge seat.

[0022] In some embodiments, a flexible support portion formed of a flexible material is connected between the two main body portions.

[0023] In some embodiments, the cushion portion further includes a connecting plate, which is disposed between the two main body portions and located at one end of the two main body portions. Both ends of the connecting plate have hinged seats, and the back support mechanism is hinged to the hinged seats.

[0024] In some embodiments, the articulated seat has a first rotating portion and a second rotating portion, the first rotating portion is connected to the back support mechanism so that the first rotating portion can rotate within a first rotation plane; the second rotating portion is connected to the main body so that the second rotating portion can rotate within a second rotation plane, and the first rotation plane and the second rotation plane are arranged to intersect.

[0025] In some embodiments, the back support mechanism includes a back support member and a headrest sliding column, the bottom of the back support member is connected to the hinge seat, and the headrest sliding column is connected to the top of the back support member.

[0026] In some embodiments, the cross section of the headrest sliding column is an arc-shaped structure.

[0027] In some embodiments, the back support member includes a first support body and a second support body, the first support body and the second support body are hinged, the headrest sliding column is connected to the top of the second support body, and the first support body is hinged to the hinge seat.

[0028] In some embodiments, the seat auxiliary device further includes a fixing assembly, wherein the fixing assembly is slidably connected to the seat cushion portion and is configured to be fixedly connected to the seat.

[0029] In some embodiments, a second sliding groove is defined in the cushion portion, and the fixing assembly is inserted into the second sliding groove, so that the cushion portion can slide relative to the fixing assembly.

[0030] In some embodiments, the fixing assembly includes two guide rails arranged in parallel; one end of the guide rail is inserted into the second sliding groove.

[0031] In some embodiments, the fixing assembly includes two guide rails arranged in parallel, and the ends of the guide rails are provided with fixing devices, which are used to cooperate with the rigid structure of the seat for fixing.

[0032] In some embodiments, the first support assembly further includes an auxiliary support rod, which is disposed between the fixing assembly and the back support mechanism to provide auxiliary support force for the back support mechanism.

[0033] In some embodiments, the fixing assembly includes two guide rails arranged in parallel; the fixing plate is rotatably arranged at the ends of the two guide rails, the fixing plate flips between a supporting position and a folding position relative to the guide rails, and one end of the auxiliary support rod is fixedly connected to the fixing plate.

[0034] In some embodiments, the auxiliary support rod includes a first rod body and a second rod body, the first rod body is slidably connected to the second rod body, and one end of the first rod body is fixedly set on the fixed plate, and one end of the second rod body is hinged to the top of the back support mechanism.

[0035] In some embodiments, the seat auxiliary device further includes an adjustable support structure, which is provided at the bottom of the seat cushion portion or the second support assembly, and is configured to be foldable on or unfolded from the seat cushion portion.

[0036] In some embodiments, the adjustable support structure includes: a support member, including a first support member, a second support member and a third support member, the second support member is arranged inside the first support member and can be extended and retracted along the length direction of the first support member, the third support member is arranged inside the second support member and can be extended and retracted along the length direction of the second support member; a first locking assembly and a second locking assembly, the first locking assembly is arranged on the first support member and is used to lock the second support member, the second locking assembly is arranged on the second support member and is used to lock the third support member.

[0037] In some embodiments, the first locking assembly includes a locking tongue and a first locking portion provided on the locking tongue, the locking tongue is provided on the first support member, and the second support member is provided with a plurality of second locking portions spaced apart along its length direction, and the first locking portion cooperates with the second locking portion to lock the second support member.

[0038] In some embodiments, the second locking assembly includes a trigger and a third locking portion provided on the second support member, a plurality of fourth locking portions are provided on the third support member at intervals along its length direction, the trigger is provided on the second support member, the third locking portion is at least partially located on the side of the trigger facing the second support member, and the trigger is configured to drive the third locking portion to cooperate with the fourth locking portion when moving along the length direction of the second support member to lock the third support member.

[0039] In some embodiments, a side surface of the trigger member facing the second support member includes a pushing surface, a pressure release surface, and a transition surface connected between the pushing surface and the pressure release surface, the pushing surface and the pressure release surface are spaced apart along the length direction of the second support member, and the pushing surface is closer to the second support member relative to the pressure release surface; when the trigger member moves to the point where the pushing surface abuts against the third locking portion, the third locking portion is engaged with the fourth locking portion; when the trigger member moves to the point where the pressure release surface is opposite to the third locking portion, the third locking portion is disconnected from the fourth locking portion.

[0040] In some embodiments, the adjustable support structure includes two, and the seat auxiliary device also includes a support mechanism. The two adjustable support structures are arranged side by side and at intervals at the bottom of the seat cushion portion or the second support component, and the support mechanism is connected between the two adjustable support structures; the support mechanism includes two support components that are rotatably connected to each other and a locking component for locking the two support components in the unfolded state, and the two support components can be folded.

[0041] In some embodiments, the connection structure of the adjustable support structure on the seat cushion portion or the second support assembly is configured as a detachable structure.

[0042] In some embodiments, the seat auxiliary device has a folding line, which is located in the middle of the junction between the seat cushion portion and the back support mechanism and extends along the respective length directions of the seat cushion portion, the back support mechanism and the second support component. The seat cushion portion, the back support mechanism and the second support component can all be folded in half along the folding line.

[0043] In some embodiments, the second support component includes an expansion mechanism at one end away from the cushion portion, and the expansion mechanism includes two expansion components rotatably connected to each other and a locking component for locking the two expansion components in the expanded state, and the two expansion components can be folded along the folding line.

[0044] In some embodiments, the locking assembly includes a first locking member and a second locking member that are respectively rotatably connected to the two support assemblies. One end of the first locking member is provided with a first interference end face and a first protrusion, and one end of the second locking member is provided with a second interference end face and a second protrusion. The first protrusion and the second protrusion are rotatably connected. When the end faces of the two support assemblies are rotated and fitted together, the first interference end face abuts against the second interference end face.

[0045] In some embodiments, each of the expansion components includes a first expansion member, a second expansion member and a third expansion member that are sequentially connected, the second expansion member can be telescopically adjusted within the first expansion member, the third expansion member can be telescopically adjusted within the second expansion member, and the ends of the two first expansion members are rotatably connected.

[0046] In some embodiments, one end of the outer surface of the second support member is provided with a first limiting portion and a first locking portion spaced apart along its own length direction, and the inner surface of the first support member is provided with a second limiting portion that cooperates with the first limiting portion for limiting the position, and a second locking portion that locks with the first locking portion.

[0047] In some embodiments, a first spiral portion is provided on one end of the inner surface of the second expansion member, and a second spiral portion cooperating with the first spiral portion is provided on the outer surface of the third expansion member.

[0048] In some embodiments, the connection structures between the back support mechanism and the second support assembly and the seat cushion portion are both constructed as detachable structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the drawings without inventive work. In the drawings:

[0050] FIG1 is a schematic structural diagram of a seat auxiliary device in an unfolded state according to some embodiments of the present application.

[0051] FIG. 2 is a schematic structural diagram of the seat auxiliary device in FIG. 1 in a folded state.

[0052] FIG3 is a schematic structural diagram of a seat auxiliary device in an unfolded state according to some other embodiments of the present application.

[0053] FIG. 4 is a schematic structural diagram of the seat auxiliary device shown in FIG. 3 in a folded state.

[0054] FIG5 is a schematic structural diagram of a seat auxiliary device in an unfolded state according to some other embodiments of the present application.

[0055] FIG. 6 is a schematic structural diagram of the seat auxiliary device shown in FIG. 5 in an incompletely folded state.

[0056] FIG. 7 is a schematic structural diagram of the seat auxiliary device shown in FIG. 5 in a fully folded state.

[0057] FIG8 is a schematic diagram of a rotation connection mechanism described in some embodiments of the present application.

[0058] FIG9 is an exploded view of the rotary connection mechanism described in some embodiments of the present application.

[0059] FIG10 is a first cross-sectional view of the rotary connection mechanism described in some embodiments of the present application.

[0060] FIG11 is a structural diagram of the first unlocking component and the pawl when they are mated, as described in some embodiments of the present application.

[0061] FIG12 is a schematic structural diagram of the adjusting member described in some embodiments of the present application.

[0062] FIG13 is a second cross-sectional view of the rotating connection mechanism described in some embodiments of the present application.

[0063] FIG14 is a schematic diagram of an adjustable support structure described in some embodiments of the present application.

[0064] FIG15 is a cross-sectional view of a local structure when the first support member and the second support member are locked, as described in some embodiments of the present application.

[0065] FIG16 is a cross-sectional view of a local structure when the second support member and the third support member are locked, as described in some embodiments of the present application.

[0066] FIG17 is an enlarged view of the structure at circle A in FIG16 .

[0067] FIG18 is a schematic structural diagram of the expansion mechanism in the expanded state described in some embodiments of the present application.

[0068] FIG19 is an exploded view of the structure of the expansion mechanism described in some embodiments of the present application.

[0069] FIG20 is a schematic structural diagram of the first propping member described in some embodiments of the present application.

[0070] FIG21 is a cross-sectional view of the structure of the second propping member and the third propping member in cooperation with each other as described in some embodiments of the present application.

[0071] Figure 100, fixing assembly; 110, guide rail; 120, fixing device; 130, fixing plate; 200, first support assembly; 210, cushion portion; 2101, main body; 2102, flexible support portion; 220, back support mechanism; 2201, first support body; 2202, second support body; 2203, headrest sliding column; 230, connecting plate; 240, hinged seat; 2401, first rotation plane; 2402, second rotation plane; 250, auxiliary support rod; 2501, first rod body; 2502, second rod body; 300, second support assembly; 310, first support portion; 3101, fixed end; 3102, linear telescopic end; 3103, avoidance gap; 320, rotating connection mechanism; 330, second support portion; 3301, fixed connection portion; 3302, sliding telescopic portion; 3303, footrest Plate; 400, folding line; 510, seat; 511, matching portion; 5111, abutting surface; 5112, pushing surface; 512, first guide portion; 513, second guide portion; 514, locking chamber; 515, rotation axis; 516, lateral support portion; 517, fixing portion; 520, adjusting member; 521, first chamber; 5211, arc concave surface; 522, second chamber; 523, transmission groove; 524, mounting groove; 525, limiting protrusion; 526, rotating shaft; 530, elastic locking assembly; 531, pawl; 5311, locking end; 532, elastic component; 540, unlocking assembly; 541, first unlocking component; 5411, first surface; 5412, second Second side; 542, second unlocking component; 5421, operating component; 542a, operating end; 542b, transmission end; 5422, transmission component; 5423, slot; X, first direction; Y, second direction; 340, adjustable support structure; 610, support member; 611, first support member; 6111, connecting component; 6112, telescopic channel; 6113, channel opening; 6114, support; 612, second support member; 6121, second locking portion; 612a, second mating surface; 612b, second guide surface; 6122, first limiting protrusion; 6123, perforation; 6124, positioning column; 613, third support member; 6131, fourth locking portion; 6132 , contact component; 6133, second limiting protrusion; 620, first locking assembly; 621, lock tongue; 6211, rotating portion; 6212, first branch; 6213, second branch; 6214, first locking portion; 621a, first mating surface; 621b, first guide surface; 622, first elastic member; 623, fixing seat; 6231, storage cavity; 6232, opening; 6233, mating port; 630, second locking assembly; 631, trigger member; 6311, pushing surface; 6312, transition surface; 6313, pressure release surface; 632, third locking portion; 633, second elastic member; 700, expansion mechanism; 710, expansion assembly; 711, first expansion member;712, second expansion member; 713, third expansion member; 71a, first limiting portion; 71b, first locking portion; 71c, second limiting portion; 71b, second locking portion; 71d, first spiral portion; 71e, second spiral portion; 71g, guide groove; 720, locking assembly; 721, first locking member; 72a, first interfering end surface; 72b, first protrusion; 722, second locking member; 72c, second interfering end surface; 72d, second protrusion; 730, mounting seat; 731, first connecting portion; 732, second connecting portion. DETAILED DESCRIPTION

[0072] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0073] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0074] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0075] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0076] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0077] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0078] In some embodiments, referring to Figures 1 to 5 , the present application provides a seat auxiliary device for use with a seat, comprising: a first support assembly 200 and a second support assembly 300. The first support assembly 200 includes a seat cushion portion 210 and a back support mechanism 220. The back support mechanism 220 is rotatably disposed at one end of the seat cushion portion 210 and is capable of flipping between an extended position and a folded position relative to the seat cushion portion 210. The second support assembly 300 is disposed at the other end of the seat cushion portion 210 and is configured to support the legs. The second support assembly 300 is capable of flipping between a supporting position and a folded position relative to the seat cushion portion 210, at least partially.

[0079] The aforementioned seat assist device rotates the back support mechanism 220 to increase the range of adjustment for the back support mechanism 220's reclining angle, allowing the back support mechanism 220 to better support the back and enhance seat comfort. Furthermore, the second support assembly 300 provides support for the legs, thereby simultaneously providing auxiliary support for multiple body parts, further enhancing seat comfort and effectively reducing fatigue.

[0080] It should be noted that, generally, the reclining adjustment range of the seat itself is limited, and it cannot provide auxiliary support for the legs. This causes local pressure on the body, which is prone to local soreness and fatigue. For this reason, the back support mechanism 220 is rotatably set at one end of the seat cushion portion 210. The reclining angle of the back support mechanism 220 can be adjusted by rotation, and the placement of the seat cushion portion 210 on the seat can be adjusted so that the user can adjust it according to the riding comfort. Among them, after the reclining angle of the back support mechanism 220 is adjusted, it can directly abut against the back of the seat to form a fixation. Of course, a locking structure can also be provided to lock the back support mechanism 220 to one end of the seat cushion portion 210; or, the back support mechanism 220 can be supported by a support structure so that the adjusted back support mechanism 220 is fixed.

[0081] In some examples, the back support mechanism 220 is reversible relative to the seat cushion 210. After reversing, the back support mechanism 220 can be parallel to the seat cushion 210. Specifically, the deployed position of the back support mechanism 220 is a position where it forms a rearward tilt angle, while the folded position is a position where the back support mechanism 220 is approximately parallel to the seat cushion 210 after being folded, thereby achieving foldability. Similarly, the second support assembly 300 can at least partially provide leg support when deployed. This leg support position is the lifting position. The second support assembly 300 can be reversible relative to the seat cushion 210. After reversing, the position where the back support mechanism 220 is approximately parallel to the seat cushion is the folded position. This reversible configuration makes the entire device more portable and reduces the overall volume occupied when folded. It should be noted that the second support assembly 300 can partially be reversible relative to the seat cushion 210 between the lifting position and the folded position. In other embodiments, the entire second support assembly 300 can be reversible between the lifting position and the folded position.

[0082] It is understandable that the cushion portion 210 can be provided on the seat by means of a restraint strap or by direct placement, and the back support mechanism 220 can abut against the back of the seat after reclining, thereby achieving stable support for the back support mechanism 220 and improving the overall load-bearing capacity and stability.

[0083] Further, please refer to Figures 1 to 5. The second support assembly 300 includes a first support portion 310, a second support portion 330 and a rotating connection mechanism 320. The first support portion 310 is connected to the cushion portion 210, and the second support portion 330 is connected to the first support portion 310 via the rotating connection mechanism 320. On a seat, the human body is often able to effectively relax various parts of the body when in a semi-reclining position, thereby providing effective auxiliary support for various parts of the body and reducing fatigue. In this embodiment, the second support assembly 300 is used to support the leg force. By dividing the second support assembly 300 into two independent support portions for arrangement, the overall posture design is more in line with the ergonomic structure, further achieving effective support for various parts of the human body, improving comfort, and reducing fatigue.

[0084] In some examples, please refer to Figures 1 to 5. The first support part 310 is roughly parallel to the cushion part 210, and the second support part 330 can form a lifting angle for lifting the human legs with the first support part 310 through the rotating connection mechanism 320, so that the calf and thigh parts of the human body are naturally bent, achieving effective support for various parts of the human body and reducing the fatigue of the human body.

[0085] It is understood that when a person is half-lying in the seat, their thigh remains substantially parallel to their buttocks, and there is a natural bend between their calf and thigh. In this case, all parts of the body are supported, thereby reducing fatigue. In this embodiment, the first support portion 310 is used to support the thigh, which is roughly parallel to the seat cushion portion 210. The second support portion 330 is used to support the calf below the thigh. The second support portion 330 can maintain a certain lifting angle with the first support portion 310, thereby effectively supporting all parts of the leg, reducing fatigue, and improving comfort.

[0086] In some examples, the rotational connection mechanism 320 includes a torque hinge. Everyone has different body structures and physiological characteristics, including leg length, pelvic position, and size. This results in variations in the natural bending angle of the lower leg. In this embodiment, the use of a torque hinge allows for support of the lower leg at any angle in a semi-recumbent position, making it suitable for people with various bending angle requirements, thereby enhancing the product's applicability.

[0087] It can be understood that by selecting a torque hinge, different people can achieve different natural bending angles by rotating the second support part 330, thereby improving applicability. When folding, the torque hinge can also be used to achieve overall stability after folding. That is, ordinary hinges cannot withstand a certain supporting force, which makes it easy to flip after folding, making it inconvenient to maintain the stability of the folded state. In this embodiment, the torque hinge can withstand a certain force, thereby maintaining the stability of the folded state.

[0088] In some embodiments, referring to Figures 1 to 5 , the first support portion 310 is extendable on the seat cushion portion 210. This extension allows the first support portion 310 to be adjusted based on a person's height and sitting posture, thereby increasing the support area for the person's thighs, improving riding comfort, and reducing fatigue.

[0089] It should be noted that there can be various telescopic designs of the first support portion 310 on the cushion portion 210, for example: the first support portion 310 can be slidably sleeved inside the cushion portion 210; or, the first support portion 310 is set on the cushion portion 210 through a structure such as a guide groove or a track, etc.

[0090] Furthermore, referring to Figures 3 and 4 , a first sliding groove is further defined within the cushion portion 210, into which the first support portion 310 is inserted. Thus, through the cooperative sliding of the first support portion 310 and the first sliding groove, the first support portion 310 can slide along the extension direction of the first sliding groove, thereby meeting the extension dimension requirements and improving the applicability of the device.

[0091] It is understandable that different people have different heights and require different support areas for their thighs and buttocks. In this embodiment, the sliding arrangement of the first support portion 310 and the first sliding groove allows for adjustment based on needs, thereby facilitating adjustment for people of different heights, thereby improving applicability and making it suitable for people of all heights. Furthermore, this sliding arrangement allows the first support portion 310 to be located within the seat cushion portion 210 when in the folded position, further reducing the overall space occupied and the overall volume.

[0092] In some embodiments, referring to Figures 1 and 2 , the first support portion 310 includes a fixed end 3101 and a linear telescopic end 3102. The fixed end 3101 is fixedly connected to the seat cushion 210, and the linear telescopic end 3102 is slidably connected to the fixed end 3101. The rotating connection mechanism 320 is provided at the end of the linear telescopic end 3102. Human fatigue in a chair is largely due to limited auxiliary support for various parts of the body, which causes soreness and aggravated fatigue in certain parts of the body. In this embodiment, the first support portion 310 has a linear telescopic end 3102. The linear telescopic end 3102 can further increase the auxiliary support area for the buttocks and thighs of the human body, thereby providing a more comprehensive support effect, reducing fatigue, and improving applicability.

[0093] It is understandable that different people have different heights and require different support areas for their thighs and buttocks. In this embodiment, the provision of the linear telescopic end 3102 allows for adjustment based on demand, making it easier to adjust for people of different heights, thereby improving applicability and making it suitable for people of all heights. Furthermore, the provision of the linear telescopic end 3102 allows it to be located within the fixed end 3101 and the seat cushion portion 210 when in the folded position, further reducing the overall space occupied and the overall volume.

[0094] In some embodiments, referring to FIG5 , the first support portion 310 includes a fixed end 3101 and a linear telescopic end 3102. The linear telescopic end 3102 is slidably connected to the seat cushion 210. The fixed end 3101 is connected to the end of the linear telescopic end 3102 away from the seat cushion 210, and a clearance gap 3103 is defined between the fixed end 3101 and the linear telescopic end 3102. As can be seen, the fixed end 3101 can extend and retract along with the linear telescopic end 3102 on the seat cushion 210. This allows the fixed end 3101 to be moved to the thigh area according to different body heights, effectively supporting the thigh area.

[0095] A clearance gap 3103 is defined between the fixed end 3101 and the linear telescopic end 3102. When the linear telescopic end 3102 is retracted onto the seat cushion 210, a portion of the seat cushion 210 can extend into the clearance gap 3103, preventing structural interference between the fixed end 3101 and the seat cushion 210 during retraction, significantly improving the stowage performance of the seat assist device. Furthermore, the sliding connection of the linear telescopic end 3102 within the seat cushion 210 can be designed in a variety of ways, such as inserting the linear telescopic end 3102 into the seat cushion 210 or providing a guide groove or track for the linear telescopic end 3102 within the seat cushion 210.

[0096] In some embodiments, referring to Figures 8 to 10 , the rotation connection mechanism 320 includes a base 510, an adjustment member 520, an elastic locking assembly 530, and an unlocking assembly 540. The base 510 is connected to the first support portion 310; the adjustment member 520 is connected to the second support portion 330 and is disposed on the base 510 and can rotate about a rotation axis 526. The base 510 is provided with a plurality of mating portions 511 distributed around the periphery of the rotation axis 526; the elastic locking assembly 530 is disposed on the adjustment member 520. The elastic locking assembly 530 cooperates with the mating portions 511 to restrict the adjustment member 520 from rotating in a first direction X and allows the adjustment member 520 to rotate in a second direction Y opposite to the first direction X. The unlocking assembly 540 includes a first unlocking component 541 and a second unlocking component 542, both of which are arranged on the adjusting member 520. When the adjusting member 520 rotates to the first extreme position along the second direction Y, the first unlocking component 541 is matched with the elastic locking assembly 530 and drives the elastic locking assembly 530 to remain separated from the matching portion 511. When the adjusting member 520 rotates to the second extreme position along the first direction X, the first unlocking component 541 is separated from the elastic locking assembly 530 to allow the elastic locking assembly 530 to cooperate with the matching portion 511; the second unlocking component 542 is transmission-connected to the elastic locking assembly 530, and is used to drive the elastic locking assembly 530 to separate from the matching portion 511.

[0097] In the hinge structure described above, when adjusting the angle, the adjusting member 520 is rotated along the second direction Y, so that the elastic locking assembly 530 engages with different mating portions 511. Since the elastic locking assembly 530 can limit the rotation of the adjusting member 520 along the first direction X when mating with the mating portions 511, it can ensure that the adjusting member 520 is at the desired angle to complete the angle adjustment operation. When the adjusting member 520 is rotated to the first extreme position along the second direction Y, the elastic locking assembly 530 engages with the first unlocking component 541 and remains separated from each mating portion 511. At this time, the adjusting member 520 can be rotated and reset along the first direction X. When the adjusting member 520 is rotated to the second extreme position along the first direction X, the elastic locking assembly 530 separates from the first unlocking component 541, allowing the elastic locking assembly 530 to re-engage with the mating portion 511, thereby achieving the automatic unlocking and reset function. Furthermore, by operating the second unlocking member 542, the elastic locking assembly 530 is separated from the mating portions 511, thereby enabling the hinge structure to be manually unlocked at different travels. This design allows for automatic unlocking at the maximum rotational travel while also enabling unlocking at different travels, improving folding performance.

[0098] It should be noted that the elastic locking assembly 530 is a structure having a certain elastic function. When the elastic locking assembly 530 is engaged with the mating portion 511, the adjusting member 520 cannot rotate in the first direction X, but can continue to rotate in the second direction Y, thereby realizing a one-way locking function. There are various ways to implement the one-way rotation locking. For example, when the adjusting member 520 rotates in the second direction Y, the direction of the force applied by the mating portion 511 to the elastic locking assembly 530 intersects the longitudinal direction of the adjusting member 520, causing the elastic locking assembly 530 to elastically rotate. When the adjusting member 520 tends to rotate in the first direction X, the direction of the force applied by the mating portion 511 to the elastic locking assembly 530 is parallel or substantially parallel to the longitudinal direction of the adjusting member 520, preventing the elastic locking assembly 530 from rotating, thereby causing the mating portion 511 to abut against the elastic locking assembly 530. Alternatively, the elastic locking assembly 530 can be designed to rotate in the first direction X but not in the second direction Y.

[0099] The first direction X may be a clockwise direction, and the second direction Y may be a counterclockwise direction; or the first direction X may be a counterclockwise direction, and the second direction Y may be a clockwise direction. In some embodiments, the first direction X is a clockwise direction, and the second direction Y is a counterclockwise direction.

[0100] During the automatic unlocking process, when the adjusting member 520 rotates to the first limit position along the second direction Y, the elastic locking assembly 530 engages with the first unlocking component 541 and remains separated from each of the mating portions 511. For example, when the adjusting member 520 rotates to the first limit position along the second direction Y, the elastic locking assembly 530 is restrained by the limiting structure on the base 510, causing the elastic locking assembly 530 to rotate or move along the first direction X until it abuts or engages with the first unlocking component 541, thereby combining the first unlocking component 541 with the elastic locking assembly 530. Since the elastic locking assembly 530 is disconnected from the mating portion 511, the adjusting member 520 can rotate along the first direction X. When it rotates to the second extreme position, the elastic locking assembly 530 can be affected by another limiting structure on the base body 510, so that the elastic locking assembly 530 is subjected to a force along the second direction Y, thereby disconnecting the elastic locking assembly 530 from the first unlocking component 541. At this time, the elastic locking assembly 530 is re-engaged with each mating portion 511.

[0101] The first limit position refers to the position corresponding to the maximum rotation stroke of the adjusting member 520 along the second direction Y, and the second limit position refers to the position corresponding to the maximum rotation stroke of the adjusting member 520 along the first direction X.

[0102] It should also be noted that the second unlocking member 542 is a structure that applies a force to the elastic locking member 530, thereby disconnecting the elastic locking member 530 from the mating portion 511. For example, during angle adjustment, if the adjusting member 520 has not yet reached the first limit position, the user may need to adjust it in the opposite direction of the first direction X. In this case, the second unlocking member 542 can be manually triggered to disconnect the elastic locking member 530 from the mating portion 511, thereby enabling manual unlocking of the adjusting member 520 at different rotational ranges.

[0103] The second unlocking component 542 can move on the adjusting component 520 in various ways, for example: the second unlocking component 542 moves smoothly to drive the elastic locking component 530 away from the matching portion 511; or the second unlocking component 542 rotates to move the elastic locking component 530 away from the matching portion 511, etc.

[0104] Further, please refer to Figure 10, the elastic locking assembly 530 includes a pawl 531 and an elastic component 532, the pawl 531 is rotatably connected to the adjusting member 520, and one end thereof includes a locking end 5311, the elastic component 532 is connected to the pawl 531 and the adjusting member 520, and is used to drive the locking end 5311 to cooperate with the matching portion 511. When the adjusting member 520 is rotated to the first extreme position, the first unlocking component 541 is matched with the locking end 5311 and drives the locking end 5311 to remain separated from the matching portion 511. When the adjusting member 520 is rotated to the second extreme position, the first unlocking component 541 is separated from the locking end 5311.

[0105] As can be seen, when the locking end 5311 of the pawl 531 engages with the mating portion 511, the adjusting member 520 cannot rotate in the first direction X, achieving one-way rotation locking. When the adjusting member 520 rotates to the first extreme position, the mating portion 511 is replaced by the first unlocking member 541 and mates with the locking end 5311, allowing the adjusting member 520 to rotate in the first direction X. When the adjusting member 520 rotates to the second extreme position, the first unlocking member 541 separates from the locking end 5311, and the locking end 5311 re-engages with the mating portion 511 under the elastic force of the elastic member 532.

[0106] It should be noted that the elastic component 532 is connected to the pawl 531 and the adjusting member 520 and can be in a compressed state or a stretched state. Specifically, in some embodiments, the elastic component 532 is located on one side of the pawl 531 along the first direction X, and one end thereof elastically abuts against the pawl 531, so that the locking end 5311 engages with the mating portion 511. The elastic component 532 can be a spring, elastic rubber, elastic metal sheet, etc.

[0107] It should also be noted that the pawl 531 is rotatably connected to the adjusting member 520, so that the pawl 531 can be engaged or disengaged with the mating portion 511 by rotation. There are various possible rotational connection methods, such as: one end of the pawl 531 is hinged to the adjusting member 520, or one end of the pawl 531 is cylindrical or spherical, and the adjusting member 520 is provided with a matching cylindrical hole or spherical hole.

[0108] In some embodiments, please refer to Figures 10 and 11, a first guide portion 512 and a second guide portion 513 are provided on the base body 510, the first guide portion 512 is located at one end of all the matching portions 511 along the second direction Y, and the second guide portion 513 is located at the other end of all the matching portions 511, and the first unlocking component 541 includes a first surface 5411 facing the first guide portion 512 and a second surface 5412 facing the second guide portion 513; when the adjusting member 520 rotates to the first extreme position, the first guide portion 512 pushes the pawl 531 to rotate along the first direction X, so that the locking end 5311 disengages from the matching portion 511 and abuts against the second surface 5412, when the adjusting member 520 rotates to the second extreme position, the second guide portion 513 pushes the pawl 531 to rotate along the second direction Y, so that the locking end 5311 disengages from the second surface 5412 and is located on one side of the first surface 5411.

[0109] As can be seen, when the adjusting member 520 rotates in the second direction Y to the first extreme position, the first guide portion 512 pushes the pawl 531, causing the locking end 5311 to overcome the elastic force of the elastic member 532 and disengage from the mating portion 511. Under the thrust of the first guide portion 512, the locking end 5311 passes over the first unlocking member 541 from the first surface 5411 and abuts against the second surface 5412 of the first unlocking member 541. This abutment of the second surface 5412 prevents the locking end 5311 from reengaging with the mating portion 511. At this point, the locking end 5311 is engaged with the first unlocking member 541 and rotates along the adjusting member 520 in the first direction X. When the adjusting member 520 rotates to the second extreme position, the second guide portion 513 pushes the pawl 531 in the opposite direction, causing it to rotate in the second direction Y, driving the locking end 5311 from the second surface 5412 to the side where the first surface 5411 is located. At this time, the locking end 5311 re-mates with the matching portion 511 under the elastic force of the elastic component 532 , thereby achieving one-way rotation locking of the adjusting member 520 .

[0110] It should be noted that the first guide portion 512 and the second guide portion 513 are respectively located at both ends of the mating portion 511. The first guide portion 512 is a structure capable of applying a force along the first direction X to the pawl 531, causing it to disengage from the mating portion 511 and abut against the second surface 5412. The second guide portion 513 is a structure capable of applying a force along the second direction Y to the pawl 531, causing the locking end 5311 of the pawl 531 to disengage from the second surface 5412 and be located on the side of the first surface 5411. The structures of the first guide portion 512 and the second guide portion 513 can be designed in various ways. For example, both can be designed as protrusions on the base body 510, or as the walls of a cavity or groove in the base body 510.

[0111] It should also be noted that the first unlocking component 541 can be in a fixed design on the adjusting member 520; it can also be in a movable design, for example: a chamber is provided on the adjusting member 520, and the first unlocking component 541 is movably provided in the chamber, so that when the adjusting member 520 rotates to the first extreme position, the pawl 531 is separated from the matching portion 511 under the push of the first guide portion 512, and the first unlocking component 541 is pushed between the pawl 531 and the matching portion 511 along the cavity wall of the chamber in the first direction X, so that the locking end 5311 of the pawl 531 abuts against the second surface 5412.

[0112] Further, referring to FIG10 , the base 510 is provided with a lock cavity 514 extending around the outer periphery of the rotation axis 526. The first guide portion 512, the mating portions 511, and the second guide portion 513 are sequentially disposed on the cavity wall of the lock cavity 514 away from the rotation axis 526. The first unlocking member 541 and the pawl 531 both extend into the lock cavity 514. As can be seen, within the lock cavity 514, the locking end 5311 of the pawl 531 engages with different mating portions 511 along the second direction Y, thereby securing the adjusting member 520 at different travels and achieving effective angle adjustment.

[0113] In order to ensure stable operation of the first guide portion 512 and the second guide portion 513 , the first guide portion 512 can be designed as a planar cavity wall of the locking cavity 514 , and the second guide portion 513 can be designed as an arcuate cavity wall of the locking cavity 514 .

[0114] At the same time, in order to achieve effective rotation of the pawl 531, an arc concave surface 5211 can be set on a cavity wall of the lock cavity 514 close to the rotation axis 526 line, specifically a cylindrical concave surface, and the end of the pawl 531 away from the locking end 5311 is inserted into the arc concave surface 5211 and can rotate around the rotation axis 526 line.

[0115] In some embodiments, referring to Figures 10 and 11 , the adjusting member 520 is provided with a first chamber 521 and a second chamber 522 communicating with the first chamber 521. The second chamber 522 is located at an end of the first chamber 521 away from the rotation axis 526. A pawl 531 is disposed in the first chamber 521, and a first unlocking member 541 is movably disposed within the second chamber 522. When the adjusting member 520 is rotated to a first extreme position, the second chamber 522 pushes the first unlocking member 541 along the wall of the first chamber 522 in the first direction X to move between the elastic locking assembly 530 and the mating portion 511, so that the locking end 5311 abuts the second surface 5412. Thus, during the automatic unlocking process, in addition to the first guide portion 512 pushing the pawl 531 in the first direction X to disengage the mating portion 511, the wall of the second chamber 522 also pushes the first unlocking member 541 between the pawl 531 and the mating portion 511, making the automatic unlocking more stable and reliable.

[0116] The first unlocking member 541 is movably disposed within the second chamber 522. This means that the first unlocking member 541 can move within the limited range of the wall of the second chamber 522. When the adjusting member 520 is rotated to the first limit position, the first unlocking member 541 is also pushed by the wall of the second chamber 522. The dimensional relationship between the first unlocking member 541 and the second chamber 522 can be determined based on the actual rotational travel of the adjusting member 520. It is sufficient that when the adjusting member 520 is rotated to the first limit position, the first unlocking member 541 is pushed between the elastic locking assembly 530 and the mating portion 511.

[0117] In some embodiments, please refer to Figure 11, each mating portion 511 includes a contact surface 5111 and a pushing surface 5112, the pushing surface 5112 is located at one end of the contact surface 5111 along the second direction Y, and the contact surface 5111 abuts against the elastic locking assembly 530 to limit the adjustment member 520 from rotating along the first direction X; the pushing surface 5112 is configured to push the elastic locking assembly 530 when the adjustment member 520 rotates along the second direction Y, so that the elastic locking assembly 530 abuts against the adjacent contact surface 5111 along the second direction Y. It can be seen that when the adjusting member 520 rotates along the second direction Y, the pushing surface 5112 pushes the elastic locking assembly 530, so that the elastic locking assembly 530 can move along the first direction X and disengage from the abutment with the abutment surface 5111; as the rotating movement of the adjusting member 520 continues, the next mating portion 511 along the second direction Y is opposite to the elastic locking assembly 530, so that the elastic locking assembly 530 abuts against the abutment surface 5111 of the mating portion 511.

[0118] It is understandable that, in order to facilitate the pushing surface 5112 to push the elastic locking assembly 530, the pushing surface 5112 is convexly extended at one end of the abutting surface 5111 and toward one side of the rotation axis 526. At this time, the pushing surface 5112 and the abutting surface 5111 can be designed to intersect.

[0119] Further, referring to Figures 10 and 11 , the elastic locking assembly 530 includes a pawl 531 and an elastic member 532 . One end of the pawl 531 includes a locking end 5311 , which abuts against the abutment surface 5111 to limit the adjustment member 520 from rotating in the first direction X. Simultaneously, when the adjustment member 520 rotates in the second direction Y, the pushing surface 5112 pushes the pawl 531 , causing the pawl 531 to compress or stretch the elastic member in the first direction X and disengage from the abutment surface 5111 .

[0120] In some embodiments, referring to FIG. 12 , the second unlocking component 542 includes an operating member 5421 and a transmission member 5422 . The operating member 5421 is movably disposed on the adjusting member 520 and is connected to the elastic locking assembly 530 through the transmission member 5422 .

[0121] It can be seen that the operating member 5421 drives the transmission member 5422 to move, so that the transmission member 5422 drives the elastic locking assembly 530 to move, so that it is disengaged from the matching portion 511, thereby achieving manual unlocking.

[0122] It should be noted that the operating member 5421 can be designed to slide or rotate on the adjusting member 520. For example, the operating member 5421 is rotated so that one end of the operating member 5421 pulls the transmission member 5422, thereby separating the elastic locking assembly 530 from the matching portion 511.

[0123] Further, please refer to Figure 12, the elastic locking assembly 530 includes a pawl 531 and an elastic component 532, and the elastic component 532 and the transmission member 5422 are both located on one side of the pawl 531 along the first direction X. In this way, when manually unlocked, the transmission member 5422 pulls the pawl 531, causing it to overcome the elastic force of the elastic component 532 along the first direction X and separate from the mating portion 511.

[0124] In some embodiments, referring to Figures 11 and 12 , the adjusting member 520 is provided with a first chamber 521 and a transmission slot 523 communicating with the first chamber 521. The transmission slot 523 is located on one side of the first chamber 521 along the first direction X. The elastic locking assembly 530 is disposed in the first chamber 521. The transmission member 5422 is disposed within the transmission slot 523, with one end connected to the elastic locking assembly 530 and the other end connected to the operating member 5421. Thus, the introduction of the transmission slot 523 facilitates the second unlocking member 542 to stably manually unlock the elastic locking member.

[0125] When the elastic locking assembly 530 includes a pawl 531 and an elastic member 532, a limiting protrusion 525 is provided on the wall of the transmission groove 523 to facilitate stabilization of the elastic locking assembly 530 within the first chamber 521. One end of the elastic member 532 abuts against the limiting protrusion 525, while the other end abuts against the pawl 531 located within the first chamber 521. Simultaneously, the transmission member 5422 located within the transmission groove 523 can also engage with the limiting protrusion 525 on the side facing away from the first chamber 521 to limit the travel of the transmission member 5422.

[0126] In some examples, the adjusting member 520 also includes a second chamber 522, within which the first unlocking member 541 is movably disposed. This means that the space within the second chamber 522 is larger than the volume of the first unlocking member 541, allowing the first unlocking member 541 to move within the second chamber 522. Furthermore, one end of all the mating portions 511 along the second direction Y is a first guide portion 512, and one end of all the mating portions 511 along the first direction X is a second guide portion 513. The elastic locking assembly 530 includes a pawl 531 and an elastic member 532. Thus, when the adjusting member 520 is rotated to the first extreme position, the first guide portion 512 pushes the pawl 531 away from the mating portion 511. At this point, the walls of the second chamber 522 along the first direction X also push the first unlocking member 541, positioning it between the locking end 5311 of the pawl 531 and the mating portion 511, thereby maintaining the separation between the locking end 5311 and the mating portion 511. When the adjusting member 520 rotates to the second extreme position, the second guide portion 513 pushes the pawl 531, and the second chamber 522 pushes the first unlocking component 541 along the inner cavity of the second direction Y, so that the pawl 531 disengages from the first unlocking component 541 and re-engages with the mating portion 511.

[0127] In some embodiments, referring to Figures 8 and 13 , the base 510 includes two juxtaposed and spaced lateral support portions 516 and a fixing portion 517 connected to the two lateral support portions 516 . The two lateral support portions 516 have mating portions 511 on both surfaces facing each other. The adjusting member 520 is rotatably connected between the two lateral support portions 516 . A first chamber 521 and a second chamber 522 are both provided through the adjusting member 520 . The elastic locking assembly 530 abuts against the mating portions 511 on both sides, and the first unlocking member 541 frictionally abuts against the lateral support portions 516 on both sides. This design facilitates stable adjustment of the adjusting member 520 between the two lateral support portions 516 , thereby improving the stability of the hinge structure.

[0128] The first unlocking member 541 frictionally abuts against the lateral support portions 516 on both sides. This can be understood as friction between the first unlocking member 541 and each lateral support portion 516. Thus, when the first unlocking member 541 is movably mounted on the adjusting member 520, such as within the second chamber 522 of the adjusting member 520, the first unlocking member 541 can remain stationary relative to the lateral support portion 516, maintaining its original position until the wall of the second chamber 522 drives the first unlocking member 541 to move. The first unlocking member 541 can be a friction structure, such as a rubber structure, a plastic structure, etc.

[0129] In some embodiments, referring to FIG. 12 , the operating member 5421 includes an operating end 542a and a transmission end 542b at each end. The portion of the operating member 5421 located between the operating end 542a and the transmission end 542b is rotatably connected to the adjustment member 520. The transmission member 5422 is provided with a slot 5423, into which the transmission end 542b is inserted. Thus, by rotating the operating member 5421, the elastic locking assembly 530 is separated from the mating portion 511, achieving effective manual unlocking.

[0130] It should be noted that, in order to avoid structural interference, a mounting groove 524 may be provided on the adjusting member 520 , and a rotating shaft 526 is provided on the bottom wall of the mounting groove 524 . The operating member 5421 is received in the mounting groove 524 and is rotatably connected to the rotating shaft 526 .

[0131] In some embodiments, please refer to Figures 1, 3 and 5. The second support part 330 includes a fixed connection part 3301 and a sliding telescopic part 3302. The fixed connection part 3301 is connected to the rotating connection mechanism 320, and the sliding telescopic part 3302 is mounted on the fixed connection part 3301 so that the sliding telescopic part 3302 can slide relative to the fixed connection part 3301.

[0132] In some examples, the second support portion 330 includes a skeleton structure on both sides, and a flexible mesh material can be provided in the middle of the skeleton structure to provide effective and comfortable support for the legs. Of course, to further enhance comfort, a layer of soft surface material can also be provided on the surface of the flexible arrangement material.

[0133] It can be understood that the use of a skeleton structure and mesh materials can make the overall weight of the device lighter, making it easier to carry and fold.

[0134] In addition, the number of the sliding telescopic parts 3302 can be one or more. Referring to Figure 5, when there are multiple sliding telescopic parts 3302, the sliding telescopic parts 3302 are sequentially connected and arranged so that the sliding telescopic parts 3302 can be extended and retracted in sequence.

[0135] Further, referring to Figure 3, a footrest 3303 is provided at the end of the sliding and telescopic portion 3302. The footrest 3303 comprises two parallel foot support portions. The footrest 3303 is pivotally connected to the sliding and telescopic portion 3302 and can be flipped between a support position and a folded position relative to the sliding and telescopic portion 3302. The footrest 3303 can be used to provide auxiliary support for the sole of the foot, improving the comprehensiveness of the support. Furthermore, the sliding and telescopic portion 3302 allows the device to accommodate people of different heights, thus enhancing its applicability.

[0136] In some embodiments, referring to Figures 1 and 3 , the seat cushion portion 210 includes two main bodies 2101, each of which has a hinged seat 240 at one end. The back support mechanism 220 is connected to the main bodies 2101 via the hinged seat 240. Thus, the back support mechanism 220 can be effectively adjusted through the hinged seat 240.

[0137] In some examples, when the first support portion 310 includes a fixed end 3101 and a linear telescopic end 3102 , a sliding track may be provided in the main body 2101 , and the sliding track cooperates with the linear telescopic end 3102 so that the linear telescopic end 3102 can slide and telescope with the main body 2101 .

[0138] Further, referring to Figure 1 , a flexible support portion 2102 formed of a flexible material is connected between the two main bodies 2101. As can be seen, if the support area in contact with the buttocks were made of a hard material, the support contact surface would be reduced, thereby exacerbating fatigue and causing localized stress. In this embodiment, the two main bodies 2101 form a frame, and by connecting the two main bodies 2101 with a flexible material, the buttocks support area is made flexible, increasing the support contact surface and reducing fatigue.

[0139] It is understood that the flexible material can be a woven material, which improves comfort and increases the contact area with the buttocks. In addition, the flexible material connected between the two main parts 2101 can reduce the overall weight and facilitate carrying.

[0140] In some embodiments, referring to Figures 1, 3, and 5, the seat cushion portion 210 further includes a connecting plate 230, which is disposed between the two main bodies 2101 and located at one end of the two main bodies 2101. Both ends of the connecting plate 230 include hinged seats 240, and the back support mechanism 220 is hingedly connected to the hinged seats 240. As can be seen, the two main bodies 2101 and the connecting plate 230 form a frame, and by connecting the flexible material between the two main bodies 2101, the buttocks support area is flexible, increasing the support contact surface and reducing fatigue.

[0141] It should be noted that the number of connecting plates 230 between the two main bodies 2101 can be one or more. When there are multiple connecting plates 230, each connecting plate 230 can be connected to each other by rotation or sliding. This allows each connecting plate 230 to be extended or folded in a corresponding manner, further reducing the space occupied by the seat auxiliary device after storage and greatly improving storage performance.

[0142] In some embodiments, the articulated seat 240 has a first rotating portion and a second rotating portion. The first rotating portion is connected to the back support mechanism 220 so that the first rotating portion can rotate within a first rotation plane. The second rotating portion is connected to the main body 2101 so that the second rotating portion can rotate within a second rotation plane. The first rotation plane and the second rotation plane are arranged to intersect. To minimize the space occupied after folding, the articulated seat 240 in this embodiment has two rotational positions. One plane is the plane formed by the backward rotation. The back support mechanism 220 achieves a greater backward rotation by connecting to one rotation plane of the articulated seat 240. The other rotation plane can cause the two sides of the main body 2101 to flip relative to each other, so that the main body 2101 as a whole folds inward, further reducing the overall space occupied and facilitating portability.

[0143] It can be understood that there are two hinged seats 240, and the two hinged seats 240 are connected by the connecting plate 230 to form a frame. In this way, the stability of the overall structure can be maintained, which facilitates the deployment of the device.

[0144] In some embodiments, referring to Figures 1, 3, and 5, the back support mechanism 220 includes a back support member and a headrest sliding post 2203. The bottom of the back support member is connected to the hinge seat 240, and the headrest sliding post 2203 is connected to the top of the back support member. The back support mechanism 220 abuts against the back of the seat. When the back support mechanism 220 is adjusted for reclining, the top portion of the back support mechanism 220 abuts against the seat back and applies pressure. In this embodiment, the headrest sliding post 2203 is configured with a curved cross-section to reduce friction with the seat back, facilitating upward and downward sliding along the seat back during adjustment.

[0145] It should be noted that the number of headrest sliding posts 2203 can be one or more. When there are multiple headrest sliding posts 2203, each headrest sliding post 2203 can be rotatably or slidably connected to each other. This allows each headrest sliding post 2203 to be correspondingly extended or folded, further reducing the space occupied by the rear seat auxiliary device and significantly improving storage performance.

[0146] Furthermore, referring to Figures 1 and 3, the cross-section of the headrest sliding column 2203 is an arc-shaped structure. By configuring the cross-section of the headrest sliding column 2203 as an arc, friction with the seat back is reduced, facilitating up and down sliding along the seat back during adjustment. In a further example, the headrest sliding column 2203 is configured as a teardrop-shaped structure, providing a larger contact surface with the passenger seat back, reducing pressure and deformation on the seat back, and enabling smooth up and down sliding on the seat back. This reduces sliding resistance and facilitates real-time adjustment of the reclining angle during the ride.

[0147] The headrest sliding column 2203 is made of a material with a low friction coefficient, and the outer surface of the headrest sliding column 2203 is processed into a smooth curved surface, which is conducive to sliding up and down during the adjustment process.

[0148] In other embodiments, the headrest sliding post 2203 is configured in a teardrop-shaped structure, providing a larger contact surface with the passenger seat back to reduce pressure and deformation on the seat back, thereby enabling smooth up and down sliding on the seat back. This reduces resistance during sliding and facilitates real-time adjustment of the reclining angle during riding.

[0149] In some embodiments, referring to Figures 1, 3, and 5, the back support comprises a first support body 2201 and a second support body 2202. The first support body 2201 and the second support body 2202 are hingedly connected, a headrest sliding column 2203 is connected to the top of the second support body 2202, and the first support body 2201 is hingedly connected to the hinge seat 240. Typically, the back support area occupies a large portion of the space. In this embodiment, the back support area is folded into two foldable parts to further reduce the space occupied after folding, making it easier to carry.

[0150] It should be noted that the first support body 2201 and the second support body 2202 are both a combination structure of a frame and a mesh, that is, a skeleton is formed by the frame, and a flexible support surface is formed by connecting the mesh inside the skeleton, thereby achieving effective support for the human back.

[0151] In this embodiment, the first support body 2201 and the second support body 2202 form a certain convex arc surface, which makes the overall outer contour conform to the ergonomic structure, can increase the contact area with the human body, thereby achieving support for various parts of the human body, reducing the fatigue of the passenger's waist and back when riding, and improving riding comfort.

[0152] In some embodiments, referring to Figures 1 and 3 , the seat assist device further includes a fixing assembly 100 slidably coupled to a seat cushion portion 210 and configured to be fixedly coupled to the seat. Typically, a seat's reclining angle is limited due to space and design constraints. In this embodiment, the fixing assembly 100 is secured to the seat, while the seat cushion portion 210 is movable along the fixing assembly 100, i.e., in the fore-aft direction of the seat. This allows for greater reclining space at the rear of the seat, thereby increasing the reclining angle and achieving a greater reclining angle, thereby enhancing seat comfort.

[0153] It is understandable that the cushion portion 210 of the seat itself is difficult to support the buttocks of the human body when a larger reclining angle is required due to its limited distribution area. In this embodiment, the cushion portion 210 can slide along the fixing assembly 100, which enables it to support the buttocks of the human body at a larger reclining angle, thereby achieving a larger reclining angle, thereby improving the comfort of the seat.

[0154] Further, referring to Figure 3, a second sliding groove is defined within the seat cushion portion 210, into which the fixing assembly 100 is inserted, allowing the seat cushion portion 210 to slide relative to the fixing assembly 100. In this embodiment, the fixing assembly 100 is disposed on the seat cushion and arranged along the front-to-back direction of the seat. This allows the seat cushion portion 210 to move along the fixing assembly 100 in the front-to-back direction, thereby increasing the contact area with the buttocks, providing adequate support for all parts of the human body, and reducing fatigue.

[0155] It can be understood that the seat cushion portion 210 can be moved by plugging, and the plugging facilitates the overall recovery and folding, thereby reducing the overall volume occupied and facilitating portability.

[0156] In some examples, a first sliding groove and a second sliding groove are provided in the cushion portion 210, and the first sliding groove is located on one side of the second sliding groove; the second support assembly 300 includes a first support portion 310, a second support portion 330, a rotating connection mechanism 320 and an adjustable support structure 340, the first support portion 310 is inserted into the first sliding groove, the rotating connection mechanism 320 is provided at the end of the first support portion 310, and the second support portion 330 is connected to the first support portion 310 through the rotating connection mechanism 320, the adjustable support structure 340 is connected to the rotating connection mechanism 320, and extends in a vertical direction to be suitable for supporting the first support portion 310.

[0157] In some embodiments, referring to Figure 3 , the fixing assembly 100 includes two parallel guide rails 110; one end of each guide rail 110 is inserted into a second sliding slot. As can be seen, the guide rails 110 are arranged on the seat and are primarily used to move the seat cushion 210. The parallel arrangement of the guide rails 110 allows the seat cushion 210 to cover the entire seat cushion area.

[0158] In some embodiments, referring to FIG1 , a fixing assembly 100 includes two parallel guide rails 110 , with fixing devices 120 disposed at the ends of the guide rails 110 for securing with the rigid structure of the seat. The seat cushion 210 needs to slide along the guide rails 110 to increase the contact area between the buttocks and the guide rails 110 . In this embodiment, by disposing fixing devices 120 at the ends of the guide rails 110 and engaging with the rigid structural components of the seat, the device is secured and the stability of the connection is improved.

[0159] In some examples, the fixing device 120 at the end of the guide rail 110 is a hook. When connecting, the hook is connected to the rigid structural members at the rear ends of both sides of the seat. The connection of the hook can be quickly connected and disassembled.

[0160] It can be understood that the cushion portion 210 is subjected to downward pressure under normal conditions and to axial tension when sliding. The hook in this embodiment can provide a pulling support force to maintain the overall stability of the device.

[0161] 3 and 4 , the first support assembly 200 further includes an auxiliary support rod 250, which is disposed between the fixing assembly 100 and the back support mechanism 220 to provide auxiliary support for the back support mechanism 220. It can be seen that the auxiliary support rod 250 can support the back support mechanism 220, thereby improving the stability and load-bearing capacity of the device.

[0162] It should be noted that a roughly triangular structure is formed between the auxiliary support rod 250, the back support mechanism 220 and the seat cushion portion 210. The auxiliary support improves the force on the back support structure and can withstand greater pressure.

[0163] It can be understood that, through the above embodiments, when in the support position, the back support mechanism 220 leans back and abuts against the back of the seat, which forms a force-bearing space between the back support mechanism 220 and the back of the seat. The connection of the auxiliary support rod 250 can increase the force-bearing area between the back support mechanism 220 and the back of the seat. The auxiliary support rod 250 can provide more effective support for the back support mechanism 220, thereby improving the stability of the back support mechanism 220 and the load-bearing capacity of the back support mechanism 220.

[0164] In some examples, both ends of the auxiliary support rod 250 are connected by a hinge, that is, one end of the auxiliary support rod 250 is hinged to the guide rail 110, and the other end of the auxiliary support rod 250 is hinged to the back support mechanism 220, so that when the back support mechanism 220 is flipped, the auxiliary support rod 250 will also rotate accordingly.

[0165] In some embodiments, referring to Figures 3 and 4 , the fixing assembly 100 includes two juxtaposed guide rails 110; a fixing plate 130 is rotatably mounted at the ends of the two guide rails 110. The fixing plate 130 flips relative to the guide rails 110 between a support position and a folded position, and one end of the auxiliary support rod 250 is fixedly connected to the fixing plate 130. The ends of the guide rails 110 are the ends away from the first sliding slots. The fixing plate 130 is rotatably connected to the ends of the guide rails 110, allowing the fixing plate 130 to flip around the ends of the guide rails 110. The provision of the fixing plate 130 provides a more stable support.

[0166] It can be understood that the fixing plate 130 connects the auxiliary support rods 250 on both sides, thereby forming a support surface at the bottom of the auxiliary support rods 250, so that when supporting, a support structure can be formed through the connection between the fixing plate 130 and the auxiliary support rods 250, thereby improving the stability of the support for the back support mechanism 220 and further improving the load-bearing capacity.

[0167] In some embodiments, referring to FIG3 , the auxiliary support rod 250 includes a first rod 2501 and a second rod 2502. The first rod 2501 and the second rod 2502 are slidably connected, with one end of the first rod 2501 fixedly mounted on the fixing plate 130, and one end of the second rod 2502 hingedly connected to the top of the back support mechanism 220. When the back support mechanism 220 rotates, the auxiliary support rod 250 needs to be at different heights for support. In this embodiment, the first rod 2501 is a fixed rod, and the second rod 2502 is able to move axially relative to the first rod 2501, thereby providing effective contact areas at different heights and improving the stability and load-bearing capacity of the structure.

[0168] It is understood that the back support mechanism 220 is used to support the back, and the back is subjected to greater forces when the human body is in a semi-reclining position, so certain stability requirements are required. In this embodiment, the auxiliary support rod 250 and the fixed plate 130 are arranged so that when in the support position, the auxiliary support rod 250, the fixed plate 130, and the top area of ​​the back support mechanism 220 are in contact with the back of the seat, thereby increasing the contact area between the back support mechanism 220 and the seat back, and improving the load-bearing capacity and stability of the overall structure.

[0169] In some embodiments, referring to FIG3 and FIG5 , the seat assist device further includes an adjustable support structure 340. The adjustable support structure 340 is disposed at the bottom of the seat cushion portion 210 or the second support assembly 300. The adjustable support structure 340 is configured to be foldable onto or unfolded from the seat cushion portion 210. As can be seen, during use, the adjustable support structure 340 is unfolded from the seat cushion portion 210 so that it rests on the bottom of the seat cushion portion 210 or the second support assembly 300, providing effective support for the thighs of the human body and, within the limited passenger seat space, providing as much riding comfort assistance as possible to the passenger, thereby improving riding comfort.

[0170] It should be noted that the adjustable support structure 340 can be located at the bottom of the seat cushion portion 210 or at the bottom of the second support assembly 300. It is sufficient to ensure that the adjustable support structure 340, when deployed, is located in the front of the seat and provides effective support for the thighs. When the adjustable support structure 340 is deployed from the seat cushion portion 210, the adjustable support structure 340 can maintain a perpendicular or substantially perpendicular relationship with the seat cushion portion 210.

[0171] In addition, when the adjustable support structure 340 is folded onto the seat cushion portion 210, the adjustable support structure 340 can be folded inside the seat cushion portion 210, for example: the bottom of the seat cushion portion 210 is recessed to form a receiving space, so that the adjustable support structure 340 is folded into the receiving space of the seat cushion portion 210; or, the adjustable support structure 340 can be folded onto the seat cushion portion 210 or overlapped on the surface of the seat cushion portion 210.

[0172] In some examples, the second support assembly 300 includes a first support portion 310, a second support portion 330, and a rotating connection mechanism 320. The first support portion 310 is connected to the seat cushion portion 210, and the second support portion 330 is connected to the first support portion 310 via the rotating connection mechanism 320. The rotating connection mechanism 320 is rotatably connected to the first support portion 310, and the adjustable support structure 340 is connected to the rotating connection mechanism 320. In this manner, during use, the rotating connection mechanism 320 can be rotated away from the first support portion 310 to open, and the adjustable support structure 340 and the second support portion 330 are simultaneously driven to open by the rotating connection mechanism 320. The support angle of the second support portion 330 can then be adjusted to effectively support the lower leg portion of the human body.

[0173] The second support portion 330 can be connected to the adjustment member 520 of the rotating connection mechanism 320, while the first support portion 310 and the adjustable support structure 340 are both connected to the base 510 of the rotating connection mechanism 320. Furthermore, the rotating connection mechanism 320 can be rotatably connected to the first support portion 310 via a folding structure, such as, but not limited to, a rotating shaft structure. In this case, the second support portion 330 and the adjustable support structure 340 share a folding structure.

[0174] Further, referring to FIG14 , the adjustable support structure 340 includes a support member 610, a first locking assembly 620, and a second locking assembly 630. The support member 610 includes a first support member 611, a second support member 612, and a third support member 613. The second support member 612 is disposed within the first support member 611 and is capable of extending and retracting along the length of the first support member 611. The third support member 613 is disposed within the second support member 612 and is capable of extending and retracting along the length of the second support member 612. The first locking assembly 620 is disposed on the first support member 611 and is used to lock the second support member 612. The second locking assembly 630 is disposed on the second support member 612 and is used to lock the third support member 613.

[0175] The adjustable support structure 340 described above has the second support member 612 inserted into the first support member 611, allowing the second support member 612 to extend and retract along the length of the first support member 611 and be locked by the first locking assembly 620. Furthermore, the third support member 613 is inserted into the second support member 612, allowing the second support member 612 to extend and retract along the length of the first support member 611 and be locked by the second locking assembly 630. This design achieves multi-stage extension and retraction, greatly satisfying the requirements of the adjustable support structure 340 for a wide range of extension and stable support. At the same time, when storing, only the first locking assembly 620 and the second locking assembly 630 need to be released separately, so that the third support member 613 is stored in the second support member 612, and the second support member 612 is stored in the first support member 611, making storage more convenient.

[0176] It should be noted that the second support member 612 is disposed within the first support member 611, and the third support member 613 is disposed within the second support member 612, indicating that both the first support member 611 and the second support member 612 are hollow structures. For example, both can be, but are not limited to, tubular structures, square hollow structures, etc. Specifically, in some embodiments, the first support member 611 defines a telescopic channel 6112, and the second support member 612 is disposed within the telescopic channel 6112. Furthermore, a channel opening 6113 communicating with the telescopic channel 6112 is provided on the surface of the first support member 611, and a first position-limiting protrusion 6122 is provided on the second support member 612. The first position-limiting protrusion 6122 is located within the channel opening 6113 to limit the telescopic travel of the second support member 612, thereby preventing the second support member 612 from excessively extending and sliding out of the first support member 611.

[0177] During storage, the third support member 613 can also be completely or partially stored in the second support member 612; and the second support member 612 can be partially stored in the first support member 611 during the storage process because it is provided with the second locking assembly 630.

[0178] The first locking assembly 620 can lock the second support member 612 in a variety of ways, such as by clamping, snapping, or by engaging a pin with a hole. Similarly, the second locking assembly 630 can lock the third support member 613 in a variety of ways, such as by clamping, snapping, engaging a pin with a hole, or engaging teeth. Furthermore, the structures of the first locking assembly 620 and the second locking assembly 630 can be identical or different.

[0179] It should also be noted that, in addition to the first support member 611, the second support member 612 and the third support member 613, the adjustable support structure 340 of the present application may also include other support members, for example: the adjustable support structure 340 has more than four support members to achieve telescopic extension of more sections.

[0180] To facilitate connection with an external structure, a connecting member 6111 may be provided at the end of the first support member 611 away from the second support member 612. Furthermore, to facilitate contact with the ground, a contact member 6132 may be provided at the end of the third support member 613 away from the second support member 612. Furthermore, to prevent the third support member 613 from disengaging from the second support member 612, a second retaining protrusion 6133 may be provided on the third support member 613.

[0181] In some embodiments, please refer to Figure 15, the first locking assembly 620 includes a locking tongue 621 and a first locking portion 6214 provided on the locking tongue 621, the locking tongue 621 is provided on the first support member 611, and the second support member 612 is provided with multiple second locking portions 6121 spaced apart along its own length direction, and the first locking portion 6214 cooperates with the second locking portion 6121 to lock the second support member 612.

[0182] It can be seen that when the second support member 612 is adjusted to the desired position, the first locking portion 6214 can cooperate with the second locking portion 6121 to fix the second support member 612 on the first support member 611, thereby achieving stable support.

[0183] It should be noted that the first locking portion 6214 cooperates with the second locking portion 6121 to lock the second support member 612, preventing it from further extending along the length of the first support member 611. To achieve this locking cooperation, the first locking portion 6214 can be a convex structure, such as a tooth, and the second locking portion 6121 can be a groove-like structure, such as a tooth groove; alternatively, the first locking portion 6214 can be a groove-like structure, such as a tooth groove, and the second locking portion 6121 can be a convex structure, such as a tooth groove. In some embodiments, the first locking portion 6214 is a tooth groove, and the second locking portion 6121 is a tooth.

[0184] At the same time, there are also various ways to connect the lock tongue 621 to the first support member 611. For example, the lock tongue 621 is fixed to the first support member 611 so that the first locking portion 6214 is pressed against the second locking portion 6121 to achieve locking. When unlocking, the lock tongue 621 can be pulled to separate the first locking portion 6214 from the second locking portion 6121. In this case, to facilitate the pulling of the lock tongue 621, the lock tongue 621 can be designed with a structure that has a certain degree of elastic deformation, such as a plastic strip. The lock tongue 621 can also be rotatably connected to the first support member 611. In this case, to ensure that the first locking portion 6214 and the second locking portion 6121 are matched, a spring, torsion spring, or magnetic structure can be provided between the lock tongue 621 and the first support member 611, so that the first locking portion 6214 and the second locking portion 6121 are matched under the action of elastic force or magnetic force.

[0185] In addition, the first locking portion 6214 and the second locking portion 6121 can be designed to be one-way self-locking. For example, referring to FIG15 , the first locking portion 6214 has a first mating surface 621a and a first guide surface 621b spaced apart along the length of the first support member 611, and the second locking portion 6121 has a second mating surface 612a and a second guide surface 612b spaced apart along the length of the first support member 611. When the second support member 612 contracts within the first support member 611, the first mating surface 621a abuts the second mating surface 612a. When the second support member 612 extends within the first support member 611, the first guide surface 621b and the second guide surface 612b engage with each other, allowing the first locking portion 6214 to push away the second locking portion 6121, for example, by overcoming the elastic force, thereby achieving one-way self-locking of the first locking assembly 620. Both the first guide surface 621b and the second guide surface 612b can be designed as inclined surfaces.

[0186] In some embodiments, referring to FIG. 15 , the first locking assembly 620 further includes a first elastic member 622. A locking tongue 621 is rotatably connected to the first support member 611. The first elastic member 622 is connected to the first support member 611 and the locking tongue 621, and is used to drive the first locking portion 6214 to engage with the second locking portion 6121. As can be seen, when the adjustable support structure 340 needs to be stored or extended, the locking tongue 621 can be rotated to separate the first locking portion 6214 from the second locking portion 6121. When the second support member 612 is adjusted to the desired position, the locking tongue 621 is released, allowing the locking tongue 621 to return to its original position under the action of the elastic member 532, thereby engaging the first locking portion 6214 with the second locking portion 6121 to complete the locking.

[0187] Optionally, the first elastic member 622 may be, but is not limited to, a spring, a torsion spring, elastic rubber, an elastic metal sheet, etc.

[0188] It is understood that the first elastic member 622 is connected to the first support member 611 and the lock tongue 621, and can provide elastic force to the lock tongue 621 with the first support member 611 as a support base, so that it returns to its initial position. The connection between the first elastic member 622 and the first support member 611 can be direct or indirect, for example: the first support member 611 is provided with an intermediate structure, and the first elastic member 622 is directly connected to the intermediate structure.

[0189] In addition, the locking tongue 621 can be rotatably connected to the first support member 611 in various ways, such as shaft-hole matching, hinge connection, etc. In some embodiments, two supports 6114 are spaced apart on the first support member 611, and one end of the locking tongue 621 is rotatably connected between the two supports 6114.

[0190] In some embodiments, please refer to Figure 15, the first locking assembly 620 also includes a fixing seat 623 provided on the first support member 611, the fixing seat 623 is provided with a storage cavity 6231 and an opening 6232 and a matching port 6233 respectively connected to the storage cavity 6231, a portion of the lock tongue 621 passes through the opening 6232 and is located in the storage cavity 6231, the matching port 6233 is connected to the interior of the first support member 611 to allow the first locking portion 6214 to be matched with the second locking portion 6121, and the first elastic member 622 is connected to the cavity wall of the storage cavity 6231 and the lock tongue 621.

[0191] As can be seen, a portion of the lock tongue 621 extends through the opening 6232 into the receiving chamber 6231. This restricts the rotation of the lock tongue 621 by the opening 6232, preventing excessive rotation of the lock tongue 621 and structural failure of the first locking assembly 620. Furthermore, utilizing the receiving chamber 6231 also helps protect the mating of the first locking portion 6214 and the second locking portion 6121, preventing them from being exposed and prone to jamming. Furthermore, because the mating port 6233 communicates with the interior of the first support member 611, the first locking portion 6214 can pass through the mating port 6233 and extend into the interior of the first support member 611, mating with the second locking portion 6121 to achieve effective locking.

[0192] It should be noted that the mating port 6233 is connected to the interior of the first support member 611 . Therefore, the mating port 6233 can be provided on the interface between the fixing seat 623 and the first support member 611 and respectively connect the fixing seat 623 and the first support member 611 .

[0193] Further, referring to FIG15 , the lock tongue 621 includes a rotating portion 6211 and a first branch 6212 and a second branch 6213 spaced apart from the rotating portion 6211. The first branch 6212 passes through the opening 6232 and is located in the receiving cavity 6231. The first elastic member 622 is connected to the first branch 6212 within the receiving cavity 6231. The second branch 6213 is located outside the fixed base 623, facing away from the receiving cavity 6231. Therefore, since the second branch 6213 is located outside the fixed base 623, facing away from the receiving cavity 6231, during the telescopic operation, the second branch 6213 can be pulled to rotate the rotating portion 6211, thereby driving the first branch 6212 and separating the first locking portion 6214 from the second locking portion 6121.

[0194] It should be noted that there are many ways to connect the first branch 6212 and the second branch 6213 to the rotating part 6211 respectively, such as: bolt connection, clamping, riveting, bonding, welding, etc.; of course, the first branch 6212, the second branch 6213 and the rotating part 6211 can also be an integrated structure.

[0195] When the operation on the second branch 6213 is canceled, the first branch 6212, under the elastic force of the first elastic member 622, drives the first locking portion 6214 to mate with the second locking portion 6121. The elastic force exerted by the first elastic member 622 on the first branch 6212 can be a pulling force, a pushing force, or a torsional force. In some embodiments, the first elastic member 622 is a torsion spring disposed on the wall of the receiving chamber 6231, with one end of the torsion spring abutting the wall of the receiving chamber 6231 and the other end abutting the first branch 6212.

[0196] In some embodiments, please refer to Figure 16, the second locking assembly 630 includes a trigger member 631 and a third locking portion 632 provided on the second support member 612, and a plurality of fourth locking portions 6131 are provided on the third support member 613 along its own length direction. The trigger member 631 is provided on the second support member 612, and the third locking portion 632 is at least partially located on the side of the trigger member 631 facing the second support member 612. The trigger member 631 is configured to drive the third locking portion 632 to cooperate with the fourth locking portion 6131 when moving along the length direction of the second support member 612 to lock the third support member 613.

[0197] It can be seen from this that when the third support member 613 is adjusted to the desired position, the trigger member 631 can be moved along the length direction of the second support member 612, so that the trigger member 631 pushes the third locking portion 632, thereby making the third locking portion 632 cooperate with the fourth locking portion 6131 to lock the third support member 613.

[0198] It should be noted that the trigger member 631 can move along the length direction of the second support member 612, and this can be achieved by linear push or spiral movement. For example, the trigger member 631 is screwed onto the outside of the second support member 612, and by rotating the trigger member 631, the trigger member 631 can be spirally advanced or retreated along the length direction of the second support member 612. In some embodiments, the trigger member 631 moves linearly along the length direction of the second support member 612 on the second support member 612.

[0199] At the same time, there are many ways to set the trigger member 631 on the second support member 612, for example: the trigger member 631 can be mounted on the outside of the second support member 612; a groove structure can also be set on the second support member 612, and the trigger member 631 can be set with a guide structure matching the groove structure, etc.

[0200] The locking mechanism between the third locking portion 632 and the fourth locking portion 6131 can be implemented in a variety of ways, such as, but not limited to, a pin-and-hole engagement mechanism, a toothed engagement mechanism, and the like. It should be noted that when the third locking portion 632 is not affected by the trigger member 631, the third locking portion 632 can be reset by an elastic structure. Alternatively, the third locking portion 632 and the fourth locking portion 6131 can be designed as non-self-locking structures. In this way, when the third support member 613 is extended or contracted, the force of the extension or contraction can cause the third locking portion 632 to separate from the fourth locking portion 6131. ​​Specifically, in some embodiments, the third locking portion 632 is a sliding pin, and the fourth locking portion 6131 is a hole-shaped structure. One end of the sliding pin is a circular arc surface, and the inner wall of the hole-shaped structure is also a circular arc surface. This allows the third locking portion 632 to more easily disengage from the fourth locking portion 6131 when the trigger member 631 is not acting on it, thus achieving a non-self-locking structure.

[0201] The number of the fourth locking portions 6131 can be multiple, such as two, three, or four. In some specific embodiments, there can be two fourth locking portions 6131, wherein when one of the fourth locking portions 6131 engages with the third locking portion 632, the third support member 613 is extended relative to the second support member 612; and when the other of the fourth locking portions 6131 engages with the third locking portion 632, the third support member 613 is retracted relative to the second support member 612.

[0202] It is understandable that the third locking portion 632 is at least partially located on the side of the trigger member 631 facing the second support member 612, so that the trigger member 631 can move to push the third locking portion 632 to mate with the fourth locking portion 6131. ​​The third locking portion 632 can be connected to the second support member 612 in various ways, such as: the third locking portion 632 is rotatably connected to the second support member 612, and under the push of the trigger member 631, one end of the third locking portion 632 rotates to mate with the fourth locking portion 6131; or the third locking portion 632 is slidably arranged on the second support member 612 along the radial direction of the second support member 612, etc.

[0203] In some embodiments, please refer to Figures 16 and 17, the side of the trigger member 631 facing the second support member 612 includes a pushing surface 6311, a pressure release surface 6313 and a transition surface 6312 connected between the pushing surface 6311 and the pressure release surface 6313, the pushing surface 6311 and the pressure release surface 6313 are spaced apart along the length direction of the second support member 612, and the pushing surface 6311 is closer to the second support member 612 relative to the pressure release surface 6313; when the trigger member 631 moves to the point where the pushing surface 6311 abuts against the third locking portion 632, the third locking portion 632 is coupled with the fourth locking portion 6131; when the trigger member 631 moves to the point where the pressure release surface 6313 is opposite to the third locking portion 632, the third locking portion 632 is disconnected from the fourth locking portion 6131.

[0204] As can be seen, when the trigger member 631 moves along the length of the second support member 612, the pressing surface 6311, the transition surface 6312, and the pressure-releasing surface 6313 sequentially pass by the third locking portion 632. Because the pressing surface 6311 is closer to the second support member 612 than the transition surface 6312, when the pressing surface 6311 passes by the third locking portion 632, the gap between the pressing surface 6311 and the second support member 612 is relatively small, which pushes the third locking portion 632 in a direction perpendicular to the pressing surface 6311, toward the fourth locking portion 6131, and engages with it, thereby achieving locking. When the pressure release surface 6313 passes through the third locking portion 632, due to the large gap between it and the second support member 612, no pushing force is applied to the third locking portion 632 to move closer to the fourth locking portion 6131, and the third locking portion 632 can move in a direction away from the fourth locking portion 6131, so that it is disconnected from the fourth locking portion 6131.

[0205] The gap between the pressure-releasing surface 6313 and the second support member 612 can be set based on the actual product, as long as the third locking portion 632 can be disconnected and reconnected with the fourth locking portion 6131. ​​Furthermore, when the trigger member 631 moves to a position where the pressure-releasing surface 6313 faces the third locking portion 632, the third locking portion 632 and the fourth locking portion 6131 can be disconnected in a variety of ways. For example, the third locking portion 632 and the fourth locking portion 6131 are non-self-locking, and the third support member 613 extends or contracts to drive the third locking portion 632 and the fourth locking portion 6131 apart. Alternatively, in other embodiments, an elastic structure can be employed to reset the third locking portion 632 and disengage the fourth locking portion 6131.

[0206] The transition surface 6312 connects the pressing surface 6311 and the pressure-releasing surface 6313, facilitating transition of the third locking portion 632 between the pressing surface 6311 and the pressure-releasing surface 6313. The transition surface 6312 can be an inclined plane or a curved surface. In some embodiments, the pressing surface 6311 mates with the surface of the second support member 612, while a gap exists between the pressure-releasing surface 6313 and the surface of the second support member 612.

[0207] In some embodiments, referring to FIG. 17 , the second support member 612 is provided with a through-hole 6123 communicating with the second support member 612. The third locking portion 632 is disposed within the through-hole 6123 and at least partially located outside the through-hole 6123. The trigger member 631 covers the through-hole 6123. Thus, the through-hole 6123 is introduced, allowing the third locking portion 632 to move up and down within the through-hole 6123. Thus, when the trigger member 631 moves and pushes the third locking portion 632, the third locking portion 632 can move within the through-hole 6123 and engage with the fourth locking portion 6131, thereby locking the second support member 612 and the third support member 613, preventing relative expansion and contraction.

[0208] Furthermore, the side of the trigger member 631 facing the second support member 612 includes a pressing surface 6311, a pressure-releasing surface 6313, and a transition surface 6312 connecting the pressing surface 6311 and the pressure-releasing surface 6313. The pressing surface 6311 is used to push the third locking portion 632 to move within the through-hole 6123 and mate with the fourth locking portion 6131. ​​The pressure-releasing surface 6313 is used to allow the third locking portion 632 in the through-hole 6123 to disengage from the fourth locking portion 6131.

[0209] In some embodiments, referring to FIG. 16 , the second locking assembly 630 further includes a second elastic member 633 connected to the trigger member 631 and the second support member 612, and configured to reset the trigger member 631 so that the trigger member 631 forces the third locking portion 632 to engage with the fourth locking portion 6131. ​​As can be seen, when a telescopic operation is required, the trigger member 631 can be pushed, compressing or stretching the second elastic member 633, thereby disengaging the third locking portion 632 from the fourth locking portion 6131, thereby allowing the third support member 613 to slide within the second support member 612. After the position of the third support member 613 is adjusted, the force acting on the trigger member 631 can be removed, and the trigger member 631 returns to its initial position under the elastic force of the second elastic member 633, causing the third locking portion 632 to re-engage with the fourth locking portion 6131 under the action of the trigger member 631.

[0210] It should be noted that when the third locking portion 632 and the fourth locking portion 6131 are unlocked, the second elastic member 633 may be compressed or stretched. Furthermore, the second elastic member 633 may be, but is not limited to, a spring, an elastic metal sheet, or elastic rubber. Specifically, in some embodiments, the second support member 612 is provided with a positioning post 6124. The second elastic member 633 is sleeved on the positioning post 6124, with one end abutting against the trigger member 631.

[0211] In some embodiments, referring to FIG. 5 , two adjustable support structures 340 are provided, and the seat assist device further includes a spreading mechanism 700. The two adjustable support structures 340 are arranged side by side and spaced apart at the bottom of the seat cushion 210 or the second support assembly 300. The spreading mechanism 700 is connected to the two adjustable support structures 700. The spreading mechanism 700 includes two spreading assemblies 710 rotatably connected to each other and a locking assembly 720 for locking the two spreading assemblies 710 in the unfolded state. The two spreading assemblies 710 are capable of folding. As can be seen, during support, the two adjustable support structures 340 are unfolded from the seat cushion 210, so that the two adjustable support structures 340 are supported side by side at the bottom of the seat cushion 210 or the second support assembly 300, providing more stable support for the legs. Furthermore, the spreading mechanism 700 is connected between the two adjustable support structures 340, making the structures of the two adjustable support structures 340 more stable.

[0212] In addition, when storing, the two adjustable support structures 700 are folded on the seat cushion portion 210. At the same time, the two expansion components 710 are unlocked by the locking component 720, and the two expansion components 710 are folded in half, so that the storage volume of the seat auxiliary device is smaller, the space occupied is smaller, and it is convenient to carry.

[0213] It should be noted that the locking assembly 720 can be designed in a variety of ways, such as locking via a threaded sleeve, securing via a pin, or a self-locking structure that abuts against each other. Furthermore, the expansion assembly 710 can also be designed as a retractable structure, such as multiple tubular structures that are connected in sequence.

[0214] In some embodiments, the connection structure of the adjustable support structure 340 on the cushion portion 210 or the second support assembly 300 is configured as a detachable structure. This design facilitates the operator to quickly disassemble the adjustable support structure 340.

[0215] Among them, there are various designs of the detachable structure, as long as the connection structure between the adjustable support structure 340 and the cushion part 210 or the second support component 300 can be quickly disassembled, for example: it can be but not limited to snap-on, magnetic fit, etc.; or each connection structure is designed to be a structure whose material is easy to disassemble.

[0216] In some embodiments, referring to Figures 5 to 7 , the seat assist device includes a fold line 400 located midway between the seat cushion portion 210 and the back support mechanism 220 and extending along the lengths of the seat cushion portion 210, the back support mechanism 220, and the second support assembly 300. The seat cushion portion 210, the back support mechanism 220, and the second support assembly 300 can all be folded in half along the fold line 400. Therefore, when stowed, the back support mechanism 220 can be folded onto one surface of the seat cushion portion 210, and the second support assembly 300 can be folded onto the other surface of the seat cushion portion 210. Since the fold line 400 sequentially extends to the seat cushion portion 210, the back support mechanism 220, and the second support assembly 300, the combined seat cushion portion 210, the back support mechanism 220, and the second support assembly 300 can be folded in half along the fold line 400, significantly reducing the storage space occupied by the seat assist device and making the device lightweight and easy to carry.

[0217] It should be noted that fold line 400 can be the centerline of the seat assist device along its width, which allows the seat assist device to fold more neatly. There are various ways to achieve the folding of the seat assist device along fold line 400. For example, the seat assist device can be divided into left and right parts, where the left and right parts can be connected by a rotating shaft and a hole, or by a hinge or other component, so that the left and right parts can rotate and overlap.

[0218] In some embodiments, referring to FIG. 5 , the seat cushion portion 210 includes two main bodies 2101 and two connecting plates 230 connected between the two main bodies 2101. The two connecting plates 230 are pivotally connected. In this case, the fold line 400 is located between the two connecting plates 230. Meanwhile, the second support assembly 300 includes a first support portion 310, a pivoting connection mechanism 320, and a second support portion 330 connected to the first support portion 310 via the pivoting connection mechanism 320. The first support portion 310 includes two parallel, linear, telescopic ends 3102 and two fixed ends 3101 connected between the linear telescopic ends 3102. The linear telescopic ends 3102 are slidably connected to the main bodies 2101 and pivotally connected. It can be seen that when folded, the linear telescopic ends 3102 can be slidably folded onto the main bodies 2101. Then, the two connecting plates 230 and the two fixed ends 3101 are folded in half along the fold line 400. It is understandable that, in order to facilitate folding, the folding axis of the first support portion 310 and the folding axis of the cushion portion 210 may be coaxially arranged.

[0219] In addition, the back support mechanism 220 includes a back support member and a headrest sliding post 2203. The bottom of the back support member is connected to the hinge seat 240, and the headrest sliding post 2203 is connected to the top of the back support member. There are two back supports, and the headrest sliding post 2203 is connected between the two back supports.

[0220] To achieve maximum foldability, as shown in Figures 6 and 7 , two headrest sliding posts 2203 are provided, rotatably connected. Each back support member may include a first support body 2201 and a second support body 2202, each hingedly connected. The headrest sliding posts 2203 are connected to the top of the second support body 2202, and the first support body 2201 is hingedly connected to the hinge seat 240. As can be seen, during folding, the first and second support bodies 2201, 2202 are rotated and superimposed on the seat cushion 210; then, the two headrest sliding posts 2203 and the main body 2101 are folded in half along the folding line 400.

[0221] In some embodiments, referring to Figures 5 and 18 , the second support assembly 300 includes an expansion mechanism 700 at the end distal from the seat cushion 210. The expansion mechanism 700 comprises two expansion assemblies 710 rotatably connected to each other and a locking assembly 720 for locking the two expansion assemblies 710 in the expanded state. The two expansion assemblies 710 can be folded along a fold line 400. Because the second support assembly 300 needs to support the calf, to prevent the second support assembly 300 from sag or collapse during support, which would affect the support effect, the expansion mechanism 700 is provided at the end distal from the seat cushion 210. During use, the two expansion assemblies 710 are deployed and locked, providing support force across the width of the second support assembly 300. When stowed, the second support assembly 300 is superimposed on the seat cushion 210 and the two expansion assemblies 710 are folded in half along the fold line 400. This design effectively balances support effectiveness with storage performance.

[0222] Further, referring to FIG5 , the second support assembly 300 includes a first support portion 310, a rotating connection mechanism 320, and a second support portion 330 connected to the first support portion 310 via the rotating connection mechanism 320. The second support portion 330 includes a fixed connection portion 3301 and a plurality of sliding and telescopic portions 3302 that are sequentially sleeved. The fixed connection portion 3301 is connected to the rotating connection mechanism 320, and one of the sliding and telescopic portions 3302 is sleeved on the fixed connection portion 3301 so that the sliding and telescopic portion 3302 can slide relative to the fixed connection portion 3301. The end of the sliding and telescopic portion 3302 that is farthest from the fixed connection portion 3301 includes a spreading mechanism 700. It should be noted that both the fixed connection portion 3301 and the sliding and telescopic portion 3302 can be a combination structure of a frame and a mesh. That is, a skeleton is formed by the frame, and a flexible support surface is formed by connecting the mesh within the skeleton, thereby achieving effective support for the lower leg of the human body.

[0223] In addition, when there are two adjustable support structures 340 , and the two adjustable support structures 340 are respectively disposed on the first support portion 310 of the second support assembly 300 at intervals, an expansion mechanism 700 may be connected between the two adjustable support structures 340 .

[0224] In some embodiments, referring to Figures 18 and 19 , the locking assembly 720 includes a first locking member 721 and a second locking member 722, each rotatably connected to the two expansion members 710. The first locking member 721 has a first interfering end surface 72a and a first protrusion 72b at one end, and the second locking member 722 has a second interfering end surface 72c and a second protrusion 72d at one end. The first protrusion 72b and the second protrusion 72d are rotatably connected. When the end surfaces of the two expansion members 710 are rotated and aligned, the first interfering end surface 72a and the second interfering end surface 72c abut against each other. It can be seen that during use, the two expansion members 710 are rotated and extended, so that the end surfaces of the two expansion members 710 are aligned with each other. At this time, the first locking member 721 and the second locking member 722 rotate accordingly, so that the first contact end surface 72a abuts against the second contact end surface 72c, thereby forming a self-locking state between the first locking member 721 and the second locking member 722, ensuring that the two expansion components 710 are locked and in a stable expanded state.

[0225] It should be noted that to achieve a certain abutment force between the first and second abutment end surfaces 72a, 72c, the sum of the lengths of the first and second locking members 721, 722 can be greater than the distance between the rotational connection locations of the first and second locking members 721, 722 on the expansion assembly 710. In this way, when fully deployed, a certain thrust is applied to the first and second locking members 721, 722 to cause the first abutment end surface 72a to abut against the second abutment end surface 72c, thereby achieving self-locking. Of course, the two expansion assemblies 710 can also be pulled in a direction away from each other to make it easier for the first abutment end surface 72a to abut against the second abutment end surface 72c.

[0226] In some examples, the first locking member 721 and the second locking member 722 can both be composed of connected connecting rods with a certain elastic material and the same length. The two can be folded and unfolded around the connection position between the first protrusion 72b and the second protrusion 72d, and are limited in the unfolded position and the folded position; and through elastic deformation, the connection position between the first protrusion 72b and the second protrusion 72d passes over the connection position between the two support components 710, thereby realizing the locking and unlocking functions.

[0227] To facilitate the installation of the first locking member 721 and the second locking member 722, please refer to Figures 19 and 20. One end of each expansion component 710 is provided with a mounting base 730, and the mounting base 730 is provided with a first connecting portion 517 and a second connecting portion 517. The first connecting portions 517 of the two expansion components 710 are rotatably connected to each other, and the first locking member 721 and the second locking member 722 are respectively rotatably connected to the two second connecting portions 517.

[0228] Further, referring to Figure 19, each expansion assembly 710 includes a first expansion member 711, a second expansion member 712, and a third expansion member 713, which are sequentially connected. The second expansion member 712 can be telescopically adjusted within the first expansion member 711, and the third expansion member 713 can be telescopically adjusted within the second expansion member 712. The ends of the two first expansion members 711 are rotatably connected. Therefore, it can be seen that during use, the ends of the two first expansion members 711 are rotated open so that the two first expansion members 711 are at or substantially at 180 degrees; then, the second expansion member 712 and the third expansion member 713 are respectively extended, so that one end of the second support assembly 300 is expanded, ensuring that the second support assembly 300 provides stable support for the calf.

[0229] It should be noted that there are multiple ways to adjust the telescopic adjustment of the second stretching member 712 on the first stretching member 711, such as: the second stretching member 712 is clamped in different holes on the first stretching member 711 through a pin shaft to achieve adjustment; or, the second stretching member 712 is threadedly engaged in the first stretching member 711, and the telescopic adjustment of the second stretching member 712 is achieved by using a threaded adjustment method; or, a locking device is used to fix the telescopic second stretching member 712 to the first stretching member 711, etc.

[0230] Similarly, there are multiple ways to adjust the telescopic adjustment of the third support member 713 on the second support member 712, such as: the third support member 713 is clamped in different holes on the second support member 712 through a pin shaft to achieve adjustment; or, the third support member 713 is threadedly engaged in the second support member 712, and the telescopic adjustment of the third support member 713 is achieved by using a threaded adjustment method; or, a locking device is used to fix the telescopic third support member 713 in the second support member 712, etc.

[0231] In some embodiments, referring to Figures 19 and 21 , a first limiting portion 71a and a first locking portion 71b are spaced apart along the length of one end of the outer surface of the second expansion member 712. The inner surface of the first expansion member 711 is provided with a second limiting portion 71c that engages with the first limiting portion 71a, and a second locking portion 71b that engages with the first locking portion 71b. It can be seen that the first limiting portion 71a and the second limiting portion 71c cooperate to prevent the second expansion member 712 from disengaging from the first expansion member 711 during withdrawal. Simultaneously, the first locking portion 71b and the second locking portion 71b cooperate to lock the extended second expansion member 712.

[0232] It should be noted that both the first limiting portion 71a and the second limiting portion 71c can be raised structures. For example, the first limiting portion 71a can be a raised ring structure on one end of the second expansion member 712, while the second limiting portion 71c can be a protruding block structure inside the first expansion member 711. Furthermore, the structures of the first locking portion 71b and the second locking portion 71b can be designed in a variety of ways. For example, both the first locking portion 71b and the second locking portion 71b can be threaded structures; or the first locking portion 71b can be a wedge-shaped protrusion while the second locking portion 71b can be a wedge-shaped surface.

[0233] In addition, to prevent the second spreading member 712 from rotating when sliding in the first spreading member 711 , a guide block may be provided on one of the surfaces of the second spreading member 712 and the first spreading member 711 , and a guide groove 71g may be provided on the other surface.

[0234] In some embodiments, referring to Figure 21 , a first spiral portion 71d is provided on one end of the inner surface of the second expansion member 712, and a second spiral portion 71e is provided on the outer surface of the third expansion member 713 to mate with the first spiral portion 71d. This design allows the third expansion member 713 to be locked within the second expansion member 712 through the engagement of the first spiral portion 71d and the second spiral portion 71e.

[0235] To prevent the third spreading member 713 from rotating when sliding in the second spreading member 712 , a guide block may be provided on one of the mating surfaces of the third spreading member 713 and the second spreading member 712 , and a guide groove 71g may be provided on the other.

[0236] In some embodiments, the connection structures between the back support mechanism 220 and the second support assembly 300 and the seat cushion portion 210 are both configured as detachable structures. This design facilitates the operator to quickly disassemble the various parts of the seat auxiliary device.

[0237] Among them, there are various designs of the detachable structure, as long as the connection structures between the back support mechanism 220 and the second support component 300 and the seat cushion part 210 can be quickly disassembled, for example: it can be but not limited to snap-on, magnetic fit, etc.; or each connection structure is designed to be a structure with materials that are easy to disassemble.

[0238] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0239] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A seat assist device, adapted to cooperate with a seat, comprising: a first support assembly comprising a seat cushion portion and a back support mechanism, wherein the back support mechanism is rotatably disposed at one end of the seat cushion portion and is flippable relative to the seat cushion portion between an unfolded position and a folded position; The second support assembly is arranged at the other end of the cushion portion, the second support assembly is used to support the legs, and the second support assembly is at least partially flipped relative to the cushion portion between a lifting position and a folding position.

2. The seat assist device according to claim 1, wherein: The second support assembly includes a first support portion, a second support portion and a rotation connection mechanism, the first support portion is connected to the seat cushion portion, and the second support portion is connected to the first support portion through the rotation connection mechanism.

3. The seat assist device according to claim 2, wherein: The first support portion is retractable on the seat cushion portion.

4. The seat assist device according to claim 3, wherein: A first sliding groove is further provided in the cushion portion, and the first supporting portion is inserted into the first sliding groove.

5. The seat assist device according to claim 3 or 4, wherein: The first support portion includes a fixed end and a linear telescopic end, the fixed end is fixedly connected to the cushion portion, the linear telescopic end is slidably connected to the fixed end, and the rotation connection mechanism is provided at the end of the linear telescopic end.

6. The seat assist device according to claim 3 or 4, wherein: The first support portion includes a fixed end and a linear telescopic end, the linear telescopic end is slidably connected to the cushion portion, the fixed end is connected to one end of the linear telescopic end away from the cushion portion, and there is an avoidance gap between the fixed end and the linear telescopic end.

7. The seat assist device according to any one of claims 2 to 6, wherein: The rotating connection mechanism comprises: a seat body connected to the first supporting portion; an adjusting member connected to the second supporting portion and provided on the base body and capable of rotating around the rotation axis, wherein the base body is provided with a plurality of matching portions distributed around the periphery of the rotation axis; an elastic locking assembly, provided on the adjusting member, wherein the elastic locking assembly cooperates with the matching portion to limit the adjusting member from rotating in a first direction and allow the adjusting member to rotate in a second direction opposite to the first direction; The unlocking component includes a first unlocking component and a second unlocking component, both of which are provided on the adjusting member. When the adjusting member is rotated to the first extreme position along the second direction, the first unlocking component is engaged with the elastic locking component and drives the elastic locking component to remain separated from the matching portion. When the adjusting member is rotated to the second extreme position along the first direction, the first unlocking component is separated from the elastic locking component to allow the elastic locking component to cooperate with the matching portion; the second unlocking component is transmission-connected to the elastic locking component for driving the elastic locking component to separate from the matching portion.

8. The seat assist device according to claim 7, wherein: The elastic locking assembly includes a pawl and an elastic component. The pawl is rotatably connected to the adjusting member, and one end of the pawl includes a locking end. The elastic component is connected to the pawl and the adjusting member, and is used to drive the locking end to cooperate with the matching portion. When the adjusting member is rotated to the first extreme position, the first unlocking component is engaged with the locking end and drives the locking end to remain separated from the matching portion. When the adjusting member is rotated to the second extreme position, the first unlocking component is separated from the locking end.

9. The seat assist device according to claim 8, wherein: The base body is provided with a first guide portion and a second guide portion, the first guide portion is located at one end of all the matching portions along the second direction, and the second guide portion is located at the other end of all the matching portions, and the first unlocking member includes a first surface facing the first guide portion and a second surface facing the second guide portion; When the adjusting member rotates to the first extreme position, the first guide portion pushes the pawl to rotate along the first direction, so that the locking end disengages from the matching portion and abuts against the second surface. When the adjusting member rotates to the second extreme position, the second guide portion pushes the pawl to rotate along the second direction, so that the locking end disengages from the second surface and is located on one side of the first surface.

10. The seat assist device according to any one of claims 7 to 9, wherein: The second unlocking component includes an operating member and a transmission member. The operating member is movably provided on the adjusting member and is connected to the elastic locking assembly through the transmission member.

11. The seat assist device according to any one of claims 2 to 10, wherein: The second supporting portion includes a fixed connecting portion and a sliding telescopic portion, the fixed connecting portion is connected to the rotating connecting mechanism, and the sliding telescopic portion is sleeved on the fixed connecting portion so that the sliding telescopic portion can slide relative to the fixed connecting portion.

12. The seat assist device according to claim 11, wherein: A foot pedal is provided at the end of the sliding telescopic part. The foot pedal has two parallel foot pedal support parts. The foot pedal is rotatably connected to the sliding telescopic part and flips between a support position and a folding position relative to the sliding telescopic part.

13. The seat assist device according to any one of claims 1 to 12, wherein: The cushion portion comprises two main body portions, one end of each of the two main body portions is provided with a hinge seat, and the back support mechanism is connected to the main body portion via the hinge seat.

14. The seat assist device according to claim 13, wherein: A flexible support portion formed of flexible material is connected between the two main body portions.

15. The seat assist device according to claim 13 or 14, wherein: The cushion portion further comprises a connecting plate, which is arranged between the two main body portions and located at one end of the two main body portions. Both ends of the connecting plate are provided with hinge seats, and the back support mechanism is hinged to the hinge seats.

16. The seat assist device according to any one of claims 13 to 15, wherein: The hinge seat has a first rotating part and a second rotating part, the first rotating part is connected to the back support mechanism so that the first rotating part can rotate along a first direction; the second rotating part is connected to the main body so that the second rotating part can rotate along a second direction, and the first direction and the second direction are arranged to intersect.

17. The seat assist device according to claim 13, wherein: The back support mechanism comprises a back support member and a headrest sliding column, the bottom of the back support member is connected to the hinge seat, and the headrest sliding column is connected to the top of the back support member.

18. The seat assist device according to claim 17, wherein: The cross section of the headrest sliding column is an arc-shaped structure.

19. The seat assist device according to claim 17 or 18, wherein: The back support member includes a first support body and a second support body, the first support body and the second support body are hinged, the headrest sliding column is connected to the top of the second support body, and the first support body is hinged to the hinge seat.

20. The seat assist device according to any one of claims 1 to 19, wherein: The seat auxiliary device further includes a fixing assembly, which is slidably connected to the seat cushion portion and is used for being fixedly connected to the seat.

21. The seat assist device according to claim 20, wherein: A second sliding groove is provided in the cushion portion, and the fixing assembly is inserted into the second sliding groove so that the cushion portion can slide relative to the fixing assembly.

22. The seat assist device according to claim 20 or 21, wherein: The fixing assembly includes two guide rails arranged in parallel; one end of the guide rail is inserted into the second sliding groove.

23. The seat assist device according to any one of claims 20 to 22, wherein: The fixing assembly includes two guide rails arranged in parallel. The ends of the guide rails are provided with fixing devices, and the fixing devices are used to cooperate with the rigid structure of the seat for fixing.

24. The seat assist device according to any one of claims 20 to 23, wherein: The first support assembly further includes an auxiliary support rod, which is disposed between the fixing assembly and the back support mechanism and is suitable for providing auxiliary supporting force for the back support mechanism.

25. The seat assist device according to claim 24, wherein: The fixing assembly also includes a fixing plate, which includes two guide rails arranged in parallel; the fixing plate is rotatably arranged at the end portions of the two guide rails, and the fixing plate flips between a supporting position and a folding position relative to the guide rails, and one end of the auxiliary support rod is fixedly connected to the fixing plate.

26. The seat assist device according to claim 25, wherein: The auxiliary support rod includes a first rod body and a second rod body, the first rod body is slidably connected to the second rod body, and one end of the first rod body is fixedly set on the fixing plate, and one end of the second rod body is hinged to the top of the back support mechanism.

27. The seat assist device according to any one of claims 1 to 26, wherein: The seat auxiliary device further includes an adjustable support structure, which is provided at the bottom of the seat cushion portion or the second support assembly. The adjustable support structure is configured to be foldable on the seat cushion portion or unfoldable from the seat cushion portion.

28. The seat assist device according to claim 27, wherein: The adjustable support structure comprises: The support member includes a first support member, a second support member, and a third support member, wherein the second support member is disposed inside the first support member and can be extended and retracted along the length direction of the first support member, and the third support member is disposed inside the second support member and can be extended and retracted along the length direction of the second support member; A first locking assembly and a second locking assembly, wherein the first locking assembly is provided on the first support member and is used to lock the second support member, and the second locking assembly is provided on the second support member and is used to lock the third support member.

29. The seat assist device of claim 28, wherein: The first locking assembly includes a locking tongue and a first locking portion provided on the locking tongue. The locking tongue is provided on the first support member. The second support member is provided with a plurality of second locking portions spaced apart along its length direction. The first locking portion cooperates with the second locking portion to lock the second support member.

30. A seating assistance device according to claim 28 or 29, wherein: The second locking assembly includes a trigger and a third locking portion provided on the second support member, and a plurality of fourth locking portions are provided on the third support member at intervals along its length direction. The trigger is provided on the second support member, and the third locking portion is at least partially located on a side of the trigger facing the second support member. The trigger is configured to drive the third locking portion to cooperate with the fourth locking portion when moving along the length direction of the second support member to lock the third support member.

31. The seat assist device of claim 30, wherein: The trigger member has a side surface facing the second support member, comprising a pushing surface, a pressure-releasing surface, and a transition surface connected between the pushing surface and the pressure-releasing surface, wherein the pushing surface and the pressure-releasing surface are spaced apart along the length direction of the second support member, and the pushing surface is closer to the second support member than the pressure-releasing surface; When the trigger moves to the point where the pushing surface abuts against the third locking portion, the third locking portion is engaged with the fourth locking portion; when the trigger moves to the point where the pressure release surface is opposite to the third locking portion, the third locking portion is disconnected from the fourth locking portion.

32. The seat assist device according to any one of claims 27 to 31, wherein: The adjustable support structure includes two, and the seat auxiliary device also includes a support mechanism. The two adjustable support structures are arranged side by side and at intervals at the bottom of the seat cushion part or the second support component, and the support mechanism is connected between the two adjustable support structures; the support mechanism includes two support components rotatably connected to each other and a locking component for locking the two support components in the unfolded state, and the two support components can be folded.

33. The seat assist device according to any one of claims 27 to 32, wherein: The connection structure of the adjustable supporting structure on the seat cushion portion or the second supporting assembly is configured as a detachable structure.

34. The seat assist device according to any one of claims 1 to 33, wherein: The seat auxiliary device has a folding line, which is located in the middle of the junction between the seat cushion portion and the back support mechanism and extends along the respective length directions of the seat cushion portion, the back support mechanism and the second support component. The seat cushion portion, the back support mechanism and the second support component can all be folded in half along the folding line.

35. The seat assist device of claim 34, wherein: The second support assembly includes an expansion mechanism at one end away from the cushion portion. The expansion mechanism includes two expansion assemblies rotatably connected to each other and a locking assembly for locking the two expansion assemblies in the expanded state. The two expansion assemblies can be folded along the folding line.

36. The seat assist device of claim 35, wherein: The locking assembly includes a first locking member and a second locking member that are rotatably connected to the two expansion assemblies respectively. One end of the first locking member is provided with a first interference end face and a first protrusion, and one end of the second locking member is provided with a second interference end face and a second protrusion. The first protrusion and the second protrusion are rotatably connected. When the end faces of the two expansion assemblies are rotated and fitted together, the first interference end face abuts against the second interference end face.

37. The seat assist device of claim 35, wherein: Each of the expansion components includes a first expansion member, a second expansion member and a third expansion member that are sequentially connected. The second expansion member can be telescopically adjusted within the first expansion member, and the third expansion member can be telescopically adjusted within the second expansion member. The ends of the two first expansion members are rotatably connected.

38. The seat assist device of claim 37, wherein: One end of the outer surface of the second expansion member is provided with a first limiting portion and a first locking portion spaced apart along its length direction, and the inner surface of the first expansion member is provided with a second limiting portion that is limited and matched with the first limiting portion, and a second locking portion that is locked and matched with the first locking portion; and / or, A first spiral portion is provided on one end of the inner surface of the second expansion member, and a second spiral portion cooperating with the first spiral portion is provided on the outer surface of the third expansion member.

39. The seat assist device according to any one of claims 1 to 38, wherein: The connection structures between the back support mechanism and the second support assembly and the seat cushion portion are both constructed as detachable structures.

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