A comfortable chair and its comfortable chair support

Abstract

The present invention belongs to the technical field of seats, and particularly relates to a comfortable chair and a bracket thereof, a backrest frame, a headrest assembly, and a leg rest assembly. The bottom end of the backrest frame is movably connected to the rear end of the seat frame, the upper part of the leg rest assembly is movably connected to the front part of the seat frame, the headrest assembly includes a headrest frame and an adjustment plate, the upper end of the adjustment plate is connected to the bottom of the headrest frame, the lower part of the adjustment plate is movably connected to the upper end of the backrest frame, and linkage plates for jointly adjusting the angle between the headrest frame and the backrest frame during the inclination adjustment of the backrest frame are arranged on the outer sides of the left and right sides of the backrest frame. The upper end of the linkage plate is movably connected to the adjustment plate, and the lower end of the linkage plate is movably connected to the rear part of the seat frame. A rotating base frame is arranged at the bottom of the seat frame, and the upper part of the rotating base frame is connected to the seat frame through a flipping mechanism. The headrest and the lumbar support are jointly adjusted, the structure is simple, the adjustment is convenient, the "zero gravity" adjustment is added, and the comfort is high.

Description

Technical Field

[0001] The invention belongs to the technical field of seats, and in particular relates to a comfort chair and a comfort chair bracket thereof. Background Art

[0002] A comfortable chair is a chair that people usually use to enjoy their leisure time. This kind of chair is not as formal as a dining chair or an office chair. It has multiple functional adjustments and can bring people a sense of physical relaxation and comfort.

[0003] At present, the main adjustment functions of conventional comfort chairs include backrest tilt adjustment, headrest angle adjustment, leg rest (or footrest) angle adjustment, etc. However, the above functional adjustments of existing comfort chairs are all single-item adjustments, that is, the backrest tilt adjustment and headrest angle adjustment are independent of each other and cannot be linked. Therefore, there are many problems. For example, ① the operation is cumbersome and not convenient enough; ② the adjustment of the backrest tilt angle and headrest angle does not conform to the ergonomic design and has poor comfort.

[0004] The adjustment function of the comfort chair is mainly controlled by the change of the state of its internal bracket. The backrest inclination adjustment and the headrest angle adjustment are independent of each other, which means that the backrest adjustment structure and the headrest angle adjustment structure are independent of each other. Undoubtedly, the structure of the comfort chair bracket is more complicated and the production cost is higher. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a comfortable chair and a comfortable chair bracket thereof in view of the above-mentioned defects. The headrest and the lumbar support can be adjusted in linkage, the design is ergonomic, the structure is simple, the adjustment convenience and the comfort of use are greatly improved, the support length of the leg rest can be adaptively adjusted as the leg rest is opened, a "zero gravity" adjustment is added, and the production cost is low.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0007] A comfortable chair bracket comprises a seat frame frame, a backrest frame, a headrest assembly, and a leg support assembly. The bottom end of the backrest frame is movably connected to the rear end of the seat frame frame, a backrest adjustment mechanism for adjusting the inclination angle of the backrest frame is provided at the seat frame frame, the upper part of the leg support assembly is movably connected to the front of the seat frame frame, and a leg support adjustment mechanism for controlling the leg support assembly to flip forward and open is provided at the seat frame frame. The headrest assembly comprises a headrest frame and an adjustment plate on the bottom side of the headrest frame, the upper end of the adjustment plate is connected to the bottom of the headrest frame, the lower part of the adjustment plate is movably connected to the upper end of the backrest frame, the lower end plate of the adjustment plate is bent and extended toward the rear lower side of the backrest frame to form an adjustment connection end, and the left and right sides of the backrest frame are provided with When the inclination angle of the backrest frame is adjusted, a linkage plate is used to adjust the angle between the headrest frame and the backrest frame in a linkage manner. The upper end plate body of the linkage plate is bent and extended toward the upper rear side of the backrest frame to form a linkage end, and the linkage end is movably connected to the adjustment connecting end of the adjustment plate. The lower end plate body of the linkage plate is bent and extended toward the side of the seat frame frame and is connected to the seat frame connecting piece arranged at the rear end of the seat frame frame. A rotating base frame is provided at the bottom of the seat frame frame. The flipping mechanism includes a fixed plate arranged at the top of the rotating base frame, a flipping plate that can be flipped upward at the upper part of the fixed plate, and a flipping driving element arranged at the front side of the fixed plate. A connecting platform is provided at the bottom of the seat frame frame. The upper part of the flipping plate is fixedly connected to the bottom of the connecting platform, and the connecting platform is connected to the seat frame. There is a gap between the frames, and the gap forms a buffer installation space. The flip plate is movably connected to the fixed plate through a movable connecting piece. Two arc-shaped limiting holes are provided at the lower part of the flip plate, and a limiting protrusion embedded in the limiting hole is provided at the corresponding position of the fixed plate. The bottom end of the flip driving element is hingedly connected to the fixed plate, and the output end of the flip driving element is movably connected to the seat frame frame. The leg support assembly includes a leg support, a leg support mounting frame on the upper side of the leg support, the leg support mounting frame is detachably connected to the front part of the seat frame frame, and the upper end of the leg support is movably connected to the leg support mounting frame. The leg support adjustment mechanism includes a connecting plate and a leg support driving element on the rear side of the connecting plate. The rear end of the leg support driving element is connected to the seat frame frame. The front end of the driving element is connected to the connecting plate, and the front end of the connecting plate is connected to the rear side of the upper end of the leg bracket. The leg bracket is also provided with a sub-bracket that slides with the leg bracket and can slide forward. The leg bracket is provided with a connecting rod mechanism that pushes the sub-bracket forward when the leg bracket is opened. The connecting structure includes a first connecting rod, a second connecting rod, and a third connecting rod arranged in an "N" shape. The upper end of the first connecting rod is movably connected to the seat frame through a first joint bearing, the lower end of the first connecting rod is movably connected to one end of the second connecting rod through a second joint bearing, the other end of the second connecting rod is movably connected to the upper end of the third connecting rod, the lower end of the third connecting rod is connected to the sub-bracket, and the middle part of the second connecting rod is movably connected to the leg bracket.

[0008] Furthermore, the left and right sides of the auxiliary bracket are provided with slide grooves, the corresponding positions of the leg bracket are provided with sliding protrusions embedded in the slide grooves, and the front part of the seat frame skeleton is provided with connecting rod protrusions. The connecting rod protrusions and the upper end of the first connecting rod, and the movable connections between the lower end of the first connecting rod and the second connecting rod are all connected and cooperated through joint bearings.

[0009] Further, the leg rest driving element is arranged on one side at the bottom of the seat frame skeleton. The rear end of the leg rest driving element is hinged to the seat frame skeleton. The front end of the leg rest driving element is movably connected to the middle of the connecting plate through a connecting rod. A connecting protrusion movably connected to the front end of the connecting plate is arranged at the rear side of the upper end of the leg rest bracket. A guiding slot hole is formed at the rear end of the connecting plate along its length direction. A limiting wheel inserted into the guiding slot hole is arranged at the corresponding position on the bottom side of the seat frame skeleton. A second support rod is arranged at the leg rest mounting bracket. Connecting sleeves are arranged at both ends of the second support rod. A square hole is formed at the axis center of the connecting sleeve. The corresponding part of the second support rod to the square hole is a square structure matching the square hole structure. The connecting sleeve rotates synchronously with the second support rod. The outer peripheral surface of the connecting sleeve is rotatably matched with the leg rest mounting bracket. A support connecting rod extending downward is arranged on the second support rod. The bottom end of the support connecting rod is movably connected to the middle of the connecting plate.

[0010] Further, the front part of the seat frame connecting piece is inserted into the rear end of the seat frame skeleton and is welded to the rear end of the seat frame skeleton. A protruding seat frame connecting protrusion is arranged at the rear side of the seat frame connecting piece. A backrest protrusion movably connected to the seat frame connecting protrusion of the seat frame connecting piece is arranged at the corresponding position at the lower part of the backrest skeleton. The output end of the backrest adjusting mechanism is movably connected to the bottom end of the backrest skeleton. The end of the backrest adjusting mechanism is movably connected to the bottom side of the seat frame skeleton. The leg rest driving element and the backrest adjusting mechanism are symmetrically arranged about the middle left and right of the seat frame skeleton.

[0011] Further, a headrest adjusting mechanism is arranged between the bottom of the headrest bracket and the adjusting plate. The headrest adjusting mechanism includes a headrest fixing plate and a connecting rod on the upper side of the headrest fixing plate. The bottom of the connecting rod is connected to the upper part of the headrest fixing plate through an angle adjusting mechanism. The bottom end of the headrest bracket is sleeved on the upper end of the connecting rod. The bottom of the headrest bracket is slidably matched with the upper end of the connecting rod. A plurality of positioning slot holes distributed up and down are arranged on the connecting rod. A locking hole is formed at the lower part of the adjusting plate. A locking bolt in threaded fit is arranged at the locking hole. After being locked, the locking bolt is inserted into the upper part of the backrest skeleton to limit the follow-up adjustment of the headrest bracket along with the backrest skeleton.

[0012] Further, the upper end of the fixing plate and the lower end of the connecting rod are movably connected through a pin shaft. The angle adjusting mechanism is a damping block sleeved on the pin shaft. The damping block is located between the fixing plate and the connecting rod.

[0013] Furthermore, vertical plates extending upward are provided on the left and right sides of the fixed plate, and connecting plates extending downward are provided on the left and right sides of the flip plate. The distance between the two connecting plates is greater than the distance between the two vertical plates. The flip plate covers the upper part of the fixed plate, and the connecting plates are located outside the vertical plates. The movable connecting member is a connecting bolt, which is arranged on the connecting plate. The inner end of the connecting bolt extends inward through the vertical plate, and the connecting bolt realizes the movable connection between the flip plate and the fixed plate. An arc-shaped limiting hole is provided on the connecting plate, and a limiting post inserted into the limiting hole is provided at the corresponding position on the vertical plate. The limiting post contacts the end of the limiting hole to limit the flipping angle range of the flip plate. The width of the bottom of the vertical plate is greater than the width of the upper part of the vertical plate, and the rear side of the vertical plate is an inclined surface. A limiting surface that abuts against the inclined surface of the vertical plate is provided at the rear part of the flip plate. A prism-shaped positioning boss is provided on the connecting bolt corresponding to the connecting plate, and a positioning hole that is structurally matched with the positioning boss is provided at the corresponding position on the connecting plate. A limiting boss is provided on the bolt body of the connecting bolt outside the positioning boss, and the limiting boss contacts and limits the outer side surface of the connecting plate. A connecting sleeve that is matched with the bolt body of the connecting bolt is provided at the corresponding position on the vertical plate. A connecting sleeve is provided on the bolt body of the connecting bolt corresponding to the connecting sleeve. A limiting plate is provided on the bolt body of the connecting bolt inside the connecting sleeve, and a connecting platform that is in interference fit with the limiting plate is provided at the corresponding position on the connecting bolt. A fastening nut is provided on the bolt body of the connecting bolt inside the limiting plate. The seat frame skeleton includes seat frame skeleton rods, a rear cross bar, and multiple first support rods. The rear cross bar is connected to the rear part of the seat frame skeleton rods to form a square frame for placing the seat cushion. Multiple first support rods are arranged inside the square frame. The front end of the first support rod is connected to the front end of the seat frame skeleton rod, and the rear end of the first support rod is connected to the rear cross bar. The rear end of the rod body of the first support rod and the middle part of the rod body of the rear cross bar smoothly extend downward to form the connecting platform. The end of the flipping drive element is hingedly connected to the driving element hinge protrusion provided at the bottom of the front side plate, and the output end of the flipping drive element is movably connected to the bottom of the front end of the first support rod.

[0014] Furthermore, armrest skeletons are provided on the left and right sides of the seat frame skeleton, and the bottom of the armrest skeletons is detachably connected to the side of the seat frame skeleton.

[0015] Furthermore, a folding table board is provided on the side of the seat frame skeleton, and the bottom of the folding table board is fixedly connected to the connection fixing holes on the front side plate.

[0016] Furthermore, the included angle between the headrest frame and the backrest skeleton is 0° - 25°, and the angle adjustment range between the backrest skeleton and the seat frame skeleton is 90 - 105°.

[0017] Furthermore, the flipping drive element and the leg rest drive element are electric drive mechanisms or manual drive mechanisms.

[0018] Further, the flipping drive element includes and is provided with a flipping electric push rod and a pulling gas spring. The bottom ends of the flipping electric push rod and the pulling gas spring are hingedly connected to the hinge protrusion of the drive element, and the output ends of the flipping electric push rod and the pulling gas spring are hingedly connected to the bottom of the first support rod.

[0019] Further, the comfortable chair bracket further includes a control component. The control component includes a control box disposed at the buffer installation space and a power supply module for powering the control box. The control box is connected to control the flipping drive element and the leg rest drive element. The control box is connected to a controller by means of wireless connection or wired connection. The controller is provided with control buttons for controlling the flipping drive element and the leg rest drive element.

[0020] Preferably, the power supply module is a battery. A battery rack is provided at the buffer installation space, and the battery is detachably disposed at the battery rack.

[0021] A comfortable chair includes the above-mentioned comfortable chair bracket. A seat cushion is provided on the seat frame skeleton of the bracket. An elastic seat cushion cover is provided outside the seat cushion, and a seat cover outer sleeve is sleeved outside the seat cushion cover. A backrest cushion is provided on the backrest skeleton of the bracket. An elastic backrest cover is sleeved outside the backrest cushion, and a backrest outer sleeve is sleeved outside the backrest cover. Multiple V-shaped air overflow grooves are provided on the backrest cushion, and massage air bags and lumbar support air bags are provided at the position corresponding to the human waist on the backrest cushion.

[0022] The beneficial effects of the present invention are as follows: Adopting the above solutions,

[0023] 1) The angle of the headrest is adjusted correspondingly with the adjustment of the backrest inclination angle. A relatively comfortable angle is always maintained between the backrest and the headrest. The linkage adjustment is convenient to operate, more in line with the ergonomic design, and simplifies the structure of the comfortable chair bracket, reducing the production cost;

[0024] 2) The overall angle of the seat frame skeleton is adjustable, driving the overall angle adjustment of the comfortable chair, having a "zero gravity" adjustment function, expanding the use function, improving comfort, and having a mechanical limit structure during adjustment, with relatively reliable safety. The safety of zero gravity adjustment is high, and there will be no backward overturning. While the zero gravity adjustment is carried out, the leg support can also be adjusted;

[0025] 3) The supporting length of the leg rest component for the legs changes correspondingly with the change of the flipping opening and closing angle of the leg support, and the linkage structure is simple, improving the comfort of the legs;

[0026] 4) The comfortable chair has multiple adjustment functions and multiple use functions, greatly improving the comfort, having higher safety, and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Through the following detailed description in conjunction with the drawings, the foregoing and other objects, features, and advantages of the present invention will become apparent.

[0028] Figure 1 This is a schematic structural view of the comfortable chair bracket in the normal state in an embodiment of the present invention.

[0029] Figure 2 This is a schematic structural view of the backrest frame and the leg rest assembly of the comfortable chair bracket when they are opened in an embodiment of the present invention.

[0030] Figure 3 This is a schematic structural view of the seat frame skeleton of the comfortable chair bracket in an embodiment of the present invention.

[0031] Figure 4 This is a side view of the seat frame skeleton of the comfortable chair bracket in an embodiment of the present invention.

[0032] Figure 5 This is a side view of the backrest frame of the comfortable chair bracket when it is opened in an embodiment of the present invention.

[0033] Figure 6 This is a schematic structural view of the connection structure between the backrest frame and the seat frame skeleton of the comfortable chair bracket in an embodiment of the present invention.

[0034] Figure 7 This is a schematic structural view of the headrest adjustment mechanism of the comfortable chair bracket in an embodiment of the present invention.

[0035] Figure 8 This is a schematic structural view of the cooperation between the leg rest assembly and the seat frame skeleton of the comfortable chair bracket in an embodiment of the present invention.

[0036] Figure 9 This is a bottom view of the leg rest assembly of the comfortable chair bracket when it is opened in an embodiment of the present invention.

[0037] Figure 10 This is a schematic structural view of the leg rest bracket of the comfortable chair bracket in an embodiment of the present invention.

[0038] Figure 11 This is a cross-sectional structural view of the leg rest bracket of the comfortable chair bracket in an embodiment of the present invention.

[0039] Figure 12 This is a partial schematic structural view of the leg rest mounting bracket of the comfortable chair bracket in an embodiment of the present invention.

[0040] Figure 13 This is a schematic view of the leg rest mounting bracket of the comfortable chair bracket in an embodiment of the present invention.

[0041] Figure 14 This is a schematic structural view of the second support rod of the comfortable chair bracket in an embodiment of the present invention.

[0042] Figure 15Schematic diagram of the rear side structure at the flipping mechanism of the comfort chair bracket in an embodiment of the present invention.

[0043] Figure 16 Schematic diagram of the front side structure at the flipping mechanism of the comfort chair bracket in an embodiment of the present invention.

[0044] Figure 17 Schematic diagram of the structure of the flipping mechanism in the comfort chair bracket in an embodiment of the present invention.

[0045] Figure 18 Front view of the flipping mechanism in the comfort chair bracket in an embodiment of the present invention.

[0046] Figure 19 Partial cross-sectional schematic diagram at the connecting bolt in the comfort chair bracket in an embodiment of the present invention.

[0047] Figure 20 Schematic diagram of the structure of the connecting bolt in the comfort chair bracket in an embodiment of the present invention.

[0048] Figure 21 Cross-sectional schematic diagram at the damping block in another embodiment of the present invention.

[0049] Figure 22 Schematic diagram of the structure connecting the table board of the comfort chair bracket in an embodiment of the present invention.

[0050] Wherein: 1 is the seat frame skeleton, 11 is the seat frame protrusion, 12 is the limit wheel, 13 is the connecting rod protrusion, 14 is the armrest skeleton, 15 is the seat cushion support rod, 16 is the backrest push rod protrusion, 111 is the seat frame skeleton rod, 112 is the rear cross bar, 113 is the first support rod, 114 is the connecting platform.

[0051] 2 is the backrest skeleton, 21 is the backrest protrusion, 22 is the backrest electric push rod, 23 is the backrest support rod, 24 is the backrest electric push rod hinge protrusion.

[0052] 3 is the headrest frame, 31 is the adjustment plate, 311 is the locking hole, 32 is the headrest fixing plate, 33 is the connecting rod, 34 is the damping block, 35 is the connecting shaft, 341 is the first damping block, 3411 is the annular groove, 342 is the second damping block, 3421 is the wrapping part, 3422 is the connecting protrusion.

[0053] 4 is the linkage plate.

[0054] 5 is the leg bracket, 51 is the leg rest mounting bracket, 511 is the second support rod, 512 is the support connecting rod, 513 is the connecting sleeve, 52 is the connecting plate, 521 is the guide slot hole, 53 is the leg rest electric push rod, 54 is the connecting rod, 55 is the connecting protrusion, 56 is the sub-bracket, 561 is the sliding groove, 57 is the first connecting rod, 58 is the second connecting rod, 59 is the third connecting rod, 510 is the sliding protrusion.

[0055] 6 is the first spherical plain bearing, 61 is the second spherical plain bearing, 7 is the rotating base frame,

[0056] 8 is the fixed plate, 81 is the vertical plate, 82 is the limit post, 83 is the front side plate, 831 is the connecting and fixing hole,

[0057] 9 is the flipping plate, 91 is the connecting plate, 911 is the limiting surface, 92 is the limiting hole, 93 is the flipping electric push rod, 94 is the tension gas spring, 95 is the protruding part,

[0058] 10 is the connecting bolt, 101 is the positioning boss, 102 is the connecting sleeve, 103 is the connecting collar, 104 is the limiting plate, 105 is the cut flat groove. Detailed implementation mode

[0059] The present invention will be further described below with reference to the accompanying drawings.

[0060] Example 1: Refer to Figure 1 - Figure 2 A comfortable chair bracket includes a seat frame skeleton 1, a backrest skeleton 2, a headrest assembly, and a leg rest assembly. Refer to Figure 3 , Figure 4 , the seat frame skeleton 1 includes a seat frame skeleton rod 111, a rear cross bar 112, and two first support rods 113. The rear cross bar 112 is connected to the rear part of the seat frame skeleton rod 111. The rear cross bar 112 and the seat frame skeleton rod 111 form a square frame for placing the seat cushion. The two first support rods 113 are arranged inside the square frame. The front end of the first support rod 113 is connected to the front end of the seat frame skeleton rod 111. The rear end of the first support rod 113 is connected to the middle part of the rear cross bar 112. The rear end of the rod body of the first support rod 113 and the middle part of the rod body of the rear cross bar 112 smoothly extend towards the bottom side to form a connection platform 114. A plurality of front and rear evenly distributed seat cushion support rods 15 are provided on the upper part of the seat frame skeleton 1. The seat cushion support rods 15 adopt serpentine springs to enhance the support for the seat frame covering (seat cushion) on the seat frame skeleton 1 and improve the comfort at the seat cushion. There is a drop interval between the connection platform 114 and the square frame. The drop interval forms a buffer installation space for installing the control box, power supply components, etc. of the bracket. The buffer installation space enables the seat frame skeleton 1 to have sufficient space longitudinally, increases the component installation space at the seat frame skeleton 1, and enables the seat frame skeleton 1 to have sufficient seat cushion buffer space. During the process of a person getting up from the seat, the seat cushion will fluctuate up and down for buffering. The buffer installation space gives the seat cushion sufficient buffer space to avoid the seat cushion directly contacting the components arranged at the connection platform during buffering, improves the use flexibility of the bracket, and also avoids causing component damage. A seat frame protrusion 11 is provided at the rear end of the seat frame skeleton 1. A front convex backrest protrusion 21 is provided on the front side of the lower part of the backrest skeleton 2. The ends of the backrest protrusion 21 and the seat frame protrusion 11 are hinged to realize the movable connection between the backrest skeleton 2 and the seat frame skeleton 1.

[0061] The seat frame skeleton rod 111 is bent from a square tube. The seat frame skeleton rod 111 has a U-shaped structure with an opening facing backward. The rod body of the seat frame skeleton rod 111 has an opening facing backward. At the front end of the seat frame protrusion 11, there is a welding protrusion that can be embedded in the opening of the seat frame skeleton rod 111. After the welding protrusion is inserted into the rear end rod body of the seat frame skeleton rod 111, the seat frame protrusion and the seat frame skeleton rod 111 are welded. This structure is convenient for mass production and assembly, which is beneficial to improving production efficiency. The product has good consistency, good quality, and a high qualified rate. The seat frame protrusion 11 makes the seat frame skeleton 1 have a connecting and mating space facing backward. This connecting and mating space can facilitate the setting of the cushion on the seat frame skeleton 1. More importantly, it provides sufficient space for the connection and mating of the backrest skeleton. At the rear side of the seat frame protrusion 11, there is a protruding seat frame connecting protrusion. The front end of the backrest protrusion 21 is hingedly connected to the seat frame connecting protrusion. The cooperation between the seat frame protrusion and the backrest protrusion makes the mating part of the seat frame skeleton 1 and the backrest skeleton have sufficient mating space. This mating space, on the one hand, reserves sufficient space for the setting of the cushion and the backrest. On the other hand, it is convenient for the connection of the backrest skeleton and the cushion skeleton, and also convenient for the installation of the cushion and the backrest. The large mating space effectively improves the production and assembly efficiency of this bracket and the comfortable chair, and reduces the assembly difficulty.

[0062] The seat frame protrusion 11 protruding backward and upward and the backrest protrusion 21 protruding forward reserve sufficient space on the upper side of the seat frame skeleton 1 and the front side of the backrest skeleton 2. Compared with the existing connection structure where the ends of the backrest skeleton and the seat frame skeleton 1 are connected, the mating space at the mating part is increased, which increases the inclination adjustment range of the backrest skeleton, reduces the production and assembly difficulty of the comfortable chair, improves the adjustment range of the comfortable chair, thereby improving the comfort of the comfortable chair and the use effect. Refer to Figure 5 , on the left side of the bottom of the seat frame skeleton 1, there is a backrest electric push rod 22. The end of the backrest electric push rod 22 is hingedly connected to a backrest push rod protrusion 16 arranged at the bottom of the seat frame skeleton 1. The backrest push rod protrusion 16 protrudes backward and downward from the front bottom end surface of the seat frame skeleton rod 111. The output end of the backrest electric push rod 22 is movably connected to a backrest electric push rod hinged protrusion 24 arranged at the bottom end of the backrest skeleton 2. The backrest electric push rod hinged protrusion 24 protrudes forward from the front end of the backrest skeleton 2. The settings of the backrest electric push rod hinged protrusion 24 and the backrest push rod protrusion 16, on the one hand, facilitate the setting of the backrest electric push rod. On the other hand, the backrest electric push rod hinged protrusion 24 plays a role in promoting the expansion of the opening angle range of the backrest. When the output end of the backrest electric push rod 22 opens, it pushes the whole backrest skeleton to open. When the output end of the backrest electric push rod 22 opens and retracts, it controls the backrest skeleton to reset.

[0063] Refer to Figure 6The headrest assembly includes a headrest frame 3 and an adjustment plate 31 on the bottom side of the headrest frame 3. The upper end of the adjustment plate 31 is connected to the bottom of the headrest frame 3 through a headrest adjustment mechanism. The lower plate body of the adjustment plate 31 is movably connected to the upper end of the backrest frame 2 through a pin shaft. The lower end plate body of the adjustment plate 31 below the movably connected position with the backrest frame 2 is bent and extended to the rear lower side of the backrest frame 2 to form an adjustment connection end. The left and right sides of the backrest frame 2 are provided with a linkage plate 4 for linkage adjusting the angle between the headrest frame 3 and the backrest frame 2 when the inclination angle of the backrest frame 2 is adjusted. The upper end plate body of the linkage plate 4 is bent and extended to the rear upper side of the backrest frame 2 to form a linkage end. The linkage end end of the linkage plate 4 is hinged to the adjustment connection end end of the adjustment plate 31. The lower end plate body of the linkage plate 4 is bent and extended to the side of the seat frame frame 1 and is hinged to the bottom end of the seat frame protrusion 11 at the rear of the seat frame frame 1. The connection end of the linkage plate 4 and the seat frame protrusion 11 is a follower end. During the process of adjusting the inclination angle of the frame, as the backward inclination angle of the backrest frame 2 continues to increase, the follower end of the linkage plate 4 makes the linkage plate change with the inclination angle of the backrest frame, and the linkage plate 1 follows the movable connection point with the seat frame protrusion as the axis to make a swinging motion. The "Z"-shaped linkage plate, plus the adjustment connection end bent and extended backward, makes the linkage end of the linkage plate push the adjustment plate 31 to swing with its hinged point with the backrest frame as the axis during the backward swinging of the connection plate, and makes the upper end of the adjustment plate 31 swing upward to achieve the adjustment of the angle between the headrest frame and the backrest frame, and realize the adaptive adjustment of the headrest frame during the process of adjusting the inclination angle of the backrest frame. During the adjustment of the inclination angle of the backrest frame, the headrest frame gradually flips up to prop up the head, so that a relatively comfortable angle is always maintained between the back of the human body and the head. The follow-up adjustment structure of the headrest frame and the backrest frame conforms to the ergonomic design, greatly improves the comfort of use, has a simple structure, and is easy to use. Figure 5 In this embodiment, when the backrest sub-frame is in a normal state, that is, the state of minimum inclination, the angle between the headrest frame and the backrest frame is 0°, and when the backrest frame is in a state of maximum inclination, the angle α between the headrest frame and the backrest frame is 20°. The angle between the back of the human body and the head and neck is 20°, which conforms to the ergonomic design and is a more comfortable angle, thereby improving the comfort of the neck and thus improving the performance. A locking hole 311 is provided at the lower part of the adjustment plate 31, and a locking bolt with threaded matching is provided at the locking hole 311. The locking bolt and the locking hole are threaded. In conjunction with the detachable connection, after the locking bolt is tightened and locked, the front end of the locking bolt will be inserted into the frame body on the upper part of the backrest frame, or the front end of the locking bolt will be stuck between the backrest frame and the upper end of the adjustment plate, which can clamp the relative position between the headrest frame and the backrest frame, limiting the follow-up adjustment of the headrest frame with the backrest frame, thereby expanding the adjustment function of the headrest. Through the same bracket structure, the headrest frame can be adjusted or fixed, thereby realizing the controllability of the headrest frame following the angle adjustment of the backrest frame. For this bracket or comfort chair, it can be adjusted according to actual needs.

[0064] During use, the headrest frame is supported by the backrest frame, and the backrest frame is supported by the seat frame frame 1. The force of the headrest frame is borne by the backrest frame, and the force of the backrest frame is borne by the seat frame frame 1. The linkage plate connects the seat frame frame 1 and the adjustment plate. When the backrest frame is opened or fully opened, the adjustment plate serves as a connecting support for the headrest frame. The linkage plate is connected to the adjustment plate, and the linkage plate then forms a support for the adjustment plate. The linkage plate provides additional support for the adjustment plate, assists in sharing the force of the headrest assembly, and then improves the stability of the headrest assembly, improves the stability of the headrest frame during the adjustment process, and has high safety. Since the linkage plate is located on the outside of the backrest frame, the upper end of the linkage plate is connected to the upper end of the backrest frame through the adjustment plate, and then the linkage plate also forms an auxiliary support for the backrest frame, shares the force of the backrest frame, improves the stability of the backrest frame during adjustment, improves the safety and durability of the frame of the comfort chair, extends the service life of the comfort chair, improves the stability of the lumbar frame and the headrest assembly, and can withstand larger loads.

[0065] In order to further increase the adjustment range of the headrest frame 3 and improve the comfort of the comfort chair, a headrest adjustment mechanism is provided between the bottom of the headrest frame 3 and the adjustment plate 31. Figure 7 The headrest adjustment mechanism includes a headrest fixing plate 32 and a connecting rod 33 on the upper side of the headrest fixing plate 32. The bottom of the connecting rod 33 is movably connected to the upper part of the headrest fixing plate 32 through a connecting shaft 35. Two damping blocks 34 are arranged on the connecting shaft between the fixing plate and the connecting rod. The two damping blocks 34 are respectively connected to the fixing plate and the connecting rod. The surfaces of the two damping blocks 34 facing each other are in contact. A locking nut is arranged on the connecting shaft. The two damping blocks are pressed together by an axial locking force. The contact surfaces of the two damping blocks have sufficient friction force, so that the fixing plate and the connecting rod can maintain a certain angle. The angle between the fixing plate and the connecting rod can be adjusted and variable, and damping is generated between the damping blocks. , bend the headrest frame, the bend force overcomes the damping, the connecting rod rotates, the bend force disappears, and the angle between the connecting rod and the fixed plate is kept fixed, thereby realizing fine-tuning of the headrest angle and improving comfort. Specifically, the bottom end of the headrest frame 3 is sleeved on the upper end of the connecting rod 33, and the bottom of the headrest frame 3 is provided with a blind hole that cooperates with the rod body of the connecting rod, and the blind hole and the upper end rod body of the connecting rod are slidably matched, and the connecting rod 33 is provided with a plurality of positioning notches distributed up and down, and a rubber positioning block that is inserted into the positioning notch is provided at the corresponding position of the blind hole. The height of the headrest frame can be adjusted by pulling the headrest frame up and down, and the positioning notch and the positioning block realize the limitation of the height of the headrest frame. The headrest frame is height-adjustable and inclination-adjustable, and can be adjusted in multiple directions to improve the performance.

[0066] Reference Figure 9 - Figure 10, the leg rest assembly includes a leg rest bracket 5 and a leg rest mounting bracket 51 on the upper side of the leg rest bracket 5. The leg rest mounting bracket 51 is detachably connected to the front part of the seat frame skeleton 1 by screws, and the selection and installation of the leg rest assembly can be realized according to actual needs. The upper end of the leg rest bracket 5 is movably connected to the front end of the leg rest mounting bracket 51 by a pin shaft. A leg rest adjustment mechanism for controlling the forward flipping and opening of the leg rest bracket 5 is provided at the right bottom of the seat frame skeleton 1. The leg rest adjustment mechanism includes a connecting plate 52 and a leg rest electric push rod 53 behind the connecting plate 52. The rear end of the leg rest electric push rod 53 is movably connected to a leg rest electric push rod protrusion provided at the right bottom of the seat frame skeleton 1 by a pin shaft. The output end of the leg rest electric push rod 53 is movably connected to the middle part of the connecting plate 52 by a connecting rod 54. The rear end of the connecting rod 54 is hinged to the output end of the leg rest electric push rod 53, and the front end of the connecting rod 54 is movably connected to the upper part of the middle of the connecting plate 52 by a shaft. The front end of the connecting plate 52 is connected to a connecting protrusion 55 provided at the rear side of the front end of the leg rest bracket 5, and the front end of the connecting plate 52 is movably connected to the connecting protrusion 55 by a pin shaft. Under normal conditions, the leg rest bracket 5 is retracted at the front bottom of the seat frame skeleton 1. By controlling the extension of the output end of the leg rest electric push rod 53, the connecting rod 54 pushes the connecting plate 52 forward, and then the connecting plate 52 pushes the leg rest bracket 5 forward. The leg rest bracket 5 takes the movable connection part between its upper end and the leg rest mounting bracket as the axis, and the leg rest bracket flips forward and upward to open, supporting the legs of the occupant. The setting of the connecting rod, on the one hand, increases the pushing stroke of the leg rest electric push rod. Within the limited setting space at the bottom side of the seat frame skeleton 1, it increases the pushing stroke, improves the flipping and opening speed and the opening length of the leg rest bracket, improves the adjustment range of the leg rest of the comfortable chair, and improves the comfort of use. On the other hand, it makes the front end of the leg rest electric push rod and the upper part of the middle of the connecting plate 52 have sufficient adaptive space. During the control of the leg rest electric push rod, since both ends are movably connected, its own inclination state will change, so as to better push out the leg rest bracket and reduce the interference between each other. The connecting rod increases the distance between the front end of the leg rest electric push rod and the upper part of the middle of the connecting plate 52, and then increases the movement amount of the front end of the leg rest electric push rod at the upper part of the middle of the push rod, effectively reducing the interference phenomenon between the leg rest electric push rod and the push rod, avoiding collision, and improving the smoothness of the flipping and opening of the leg rest bracket. Refer to Figure 11, the rear end of the connecting plate 52 extends to the middle bottom side of the seat frame skeleton 1. A guiding slot hole 521 extending along its length direction is provided on the rear end plate body of the connecting plate 52. A limiting wheel 12 inserted into the guiding slot hole 521 is provided at the corresponding position in the middle of the bottom side of the seat frame skeleton 1. The limiting wheel 12 is always located within the guiding slot hole 521, and the limiting wheel and the guiding slot hole are in sliding fit. During the process of the connecting plate 52 pushing the leg bracket 5 to flip open / close, the limiting wheel 12 cooperates with the end of the guiding slot hole 521 to limit the flipping amplitude of the leg bracket, preventing the flipping open / close of the leg bracket from exceeding the range, effectively avoiding the overrun of the stroke of the leg support electric push rod and preventing damage. An annular groove is provided on the circumferential surface of the limiting wheel 12, so that the cross-section of the limiting wheel 12 is in the shape of an "I". The width of the annular groove is the same as the width of the connecting plate 52, and the outer diameter of the limiting wheel at the annular groove is the same as the inner diameter of the guiding slot hole, making the limiting wheel firmly stuck in the guiding slot hole. The limiting wheel has the functions of auxiliary support and limitation for the connecting plate 52, and then has a limiting effect on the leg bracket. The push rods on both sides are limited, so as to limit the leg bracket on both sides at the bottom, preventing the leg bracket from shaking left and right during adjustment and improving the stability of the leg bracket during adjustment.

[0067] The leg bracket 5 is further provided with a secondary bracket 56 which is slidably engaged with the leg bracket 5 and can slide forward. The leg bracket 5 is provided with a linkage mechanism that pushes the secondary bracket 56 forward when the leg bracket 5 is opened. The connecting structure includes a first link 57, a second link 58, and a third link 59 arranged in an "N" shape. In the middle of the front side of the seat frame skeleton rod 111, there is a downward protrusion, the link protrusion 13. The link protrusion 13 is located at the rear side of the leg rest mounting bracket. The upper end of the first link is connected and matched with the link protrusion 13 through a first joint bearing 6, reserving sufficient space for the setting and movement of the first link. The lower end of the first link 57 is movably connected to the left end of the second link 58 through a second joint bearing 61. The right end of the second link 58 is movably connected to the upper end of the third link 59 through a pin shaft. The lower end of the third link 59 is movably connected to the secondary bracket 56 through a pin shaft. The middle of the second link 58 is movably connected to the leg bracket 5 through a pin shaft. When the leg bracket 5 is in the closed state, the linkage mechanism is in the retracted state, and the first link 57, the second link 58, and the third link 59 are in an "N" shape. The first link 57, the third link 59, and the second link 58 are basically along the longitudinal direction. During the process of the leg bracket flipping and opening, the flipping movement of the leg bracket drives the first link 57 to flip and open accordingly. The first link 57 rotates outward with its upper end as the axis. The lower end of the first link will pull the left end of the second link upward, and the right end of the second link will move downward. Subsequently, the third link is pushed forward, and the forward-pushing third link then pushes the secondary bracket 56 to slide forward, realizing the follow-up automatic opening of the secondary bracket 56 as the leg bracket flips and opens, increasing the support length of the leg rest assembly, improving the support for the legs, and enhancing the use effect of the comfortable chair. During the flipping and closing of the leg bracket, the linkage mechanism operates in reverse to control the automatic closing of the secondary bracket along with the leg rest bracket. The three-link mechanism drives the secondary bracket to open and close following the movement, with a simple and delicate structure. Compared with other linear reciprocating drive mechanisms, this linkage mechanism is simpler, has a lower manufacturing cost, and the linkage mechanism controls the follow-up opening and closing of the secondary bracket, with higher durability and reliability in the mechanical structure cooperation, not easily failing, and having a low failure rate. Since the first link gradually flips while the leg bracket flips, the lower end of the first link is gradually lifted with a small degree of lifting. Only when the first link flips to a certain angle, that is, when the bottom end of the first link is lifted to a certain angle, will it pull the second link, so that in the initial stage of the leg bracket flipping, the secondary bracket does not slide out and the length of the leg rest remains unchanged. After the leg rest is opened to a certain angle, the secondary bracket slides out. The three-link structure has the function of adjusting the sliding-out timing of the secondary bracket, which can prevent the secondary bracket from hitting the ground and being damaged when opening at the initial stage of the leg bracket opening, making the opening of the leg bracket smoother. This footrest bracket has the function of automatically extending after opening to a suitable angle, with a better use effect;During the process of the leg bracket flipping and closing, the first link flips and resets synchronously with the leg bracket. The lower end of the first link swings downward, pulling the right end of the second link to move along the leg bracket towards the lower part of the leg bracket. The left end of the second link will move along the leg bracket body towards the upper part of the leg bracket. Subsequently, the second link pushes the third link to move along the leg bracket body towards the upper part of the leg bracket, pulling the auxiliary bracket to reset, realizing the flipping and closing of this leg adjustment bracket. The three-link structure composed of the first pull rod, the second pull rod, and the third pull rod enables the opening of the auxiliary bracket without additional driving components. The opening and reset of the auxiliary bracket follow the flipping of the leg bracket. Compared with the prior art, the structure of the leg rest bracket is simplified, and the manufacturing cost is reduced. The process of the three-link controlling the opening and closing of the auxiliary bracket is smooth, giving full play to the adjustment function of the leg rest. The left end of the second link is movably connected to the upper end of the third link through a pin rod. Sleeve tubes are sleeved on the pin rods of the second link and the third link rod members. Nuts are provided at both ends of the pin rod. The pin rod realizes the movable cooperation between the second link and the third link. The setting of the sleeve tube is to match the distance between the third link and the second link member. The second link and the third link are not in the same plane. The setting of the sleeve tube enables the second link and the third link to cooperate with their respective states during the pulling cooperation, and the rod bodies of the second link and the third link do not have axial deflection, effectively reducing wear. The first joint bearing 6 and the second joint bearing 61 at both ends of the first link can effectively reduce the wear at the connection. During the movement of the first link, since the first link and the second link are not in the same plane, the rod body of the first link will generate torsion during operation. The torsion will cause interference and wear at the connection between the first link and the second link and the seat frame, and even damage the rod body of the first link. The setting of the first joint bearing 6 and the second joint bearing 61 effectively eliminates the torsion, making the cooperation of the three-link mechanism smoother. It can realize the smooth opening / closing of the auxiliary bracket within a limited space, and can control the opening timing of the auxiliary bracket to avoid touching the ground during the opening process and causing danger.;

[0068] Sliding grooves 561 are provided on the left and right sides of the auxiliary bracket 56, and corresponding sliding protrusions 510 are provided on the leg bracket 5 and are embedded in the sliding grooves 561. The sliding protrusions 510 are in sliding cooperation with the sliding grooves 561. At the same time, a notch is formed between the sliding protrusions 510 and the leg support frame body. The auxiliary bracket body below the sliding groove 561 is located within the notch. The sliding groove and the notch form a double sliding and limiting cooperation structure between the leg bracket and the auxiliary bracket, fully ensuring the reliability of the cooperation between the auxiliary bracket and the leg bracket, improving the stability of the leg rest assembly, being able to bear a large load, enhancing the safety of this comfortable chair bracket during use, facilitating the setting of the link mechanism and its associated effects. The setting of the joint bearing reduces the wear at both ends of the first link. During the linkage of the first link, the rod body itself will rotate a certain angle along its axial direction. The setting of the joint bearing enables the first link to have flexible mobility in its axial direction, reducing wear and avoiding affecting the efficacy of the link mechanism.

[0069] Reference Figure 12 , a second support rod 511 is provided at the leg rest mounting bracket 51. Both ends of the second support rod 511 are movably connected to the leg rest mounting bracket 51. Connection sleeves 513 are provided at both ends of the second support rod 511. A square hole is provided at the axis of the connection sleeve 513. The outer wall of the second support rod 511 has a square hole structure that matches the square hole structure. The connection sleeve 513 can rotate synchronously with the second support rod. The outer peripheral surface of the connection sleeve 513 is rotatably engaged with the leg rest mounting bracket 51. The cooperation between the connection sleeve and the second support rod enables the same second support rod to have two different motion forms. The push rod connected to the second support rod rotates synchronously with the second support rod. When the connection sleeve rotates and the leg rest mounting bracket remains stationary, the movable cooperation between the rotating rod and the fixed bracket is realized, which can reduce wear and extend the service life. A support link 512 extending downward is provided on the second support rod 511. The bottom end of the support link 512 is movably connected to the middle bottom end of the connecting plate 52 through a pin shaft. The support link pulls the middle of the connecting plate 52 and applies a pulling force to the connecting plate 52. The force on the connecting plate 52 can be transmitted to the leg rest mounting bracket through the support connecting plate and the second support rod. The second support rod and the support link form a support for the connecting plate 52, sharing the force on the connecting plate 52, protecting the connecting plate 52, preventing the connecting plate 52 from deforming due to force, extending the service life of the connecting plate 52, and improving the stability at the connecting plate 52. The support link is movably connected to the connecting plate 52, avoiding the adverse effect of the support link on the connecting plate 52 when the connecting plate 52 is pushed. In addition, the support link has a guiding effect on the front part of the connecting plate 52. The upper end of the support connecting plate is fixedly connected to the second support rod. The second support rod is movably connected to the leg rest mounting bracket through the connection sleeve. The forwardly pushed connecting plate 52 will drive the support link to flip forward, causing the second support rod to rotate. The forward movement direction of the push rod can be guided through the support link, limiting and guiding the front end of the connecting plate 52. Cooperating with the guiding slot hole at the rear end of the connecting plate 52, the connecting plate 52 moves along the set direction, effectively improving the smoothness of the flipping opening and closing of the leg rest bracket. The leg rest electric push rod and the backrest electric push rod are symmetrically arranged about the middle of the seat frame skeleton 1 left and right, making the seat frame skeleton 1 stable again and improving the safety of use.

[0070] A rotating base frame 7 is provided at the bottom of the seat frame skeleton 1. The upper part of the rotating base frame 7 is connected to the seat frame skeleton 1 through a flipping mechanism. Reference Figure 13 - 15, the flipping mechanism includes a fixing plate 8 arranged at the top of the rotating base frame, a flipping plate 9 that can be flipped upward on the upper part of the fixing plate 8, a flipping electric push rod 93 arranged on the front side of the fixing plate 8, and a pulling air spring 94 arranged in parallel with the flipping electric push rod 93. Vertical plates 81 extending upward are provided on the left and right sides of the fixing plate 8, and connecting plates 91 extending downward are provided on the left and right sides of the flipping plate 9. The fixing plate 8 is of a U-shaped structure, and the flipping plate 9 is of an inverted U-shaped structure covering the upper part of the fixing plate. The distance between the two connecting plates 91 is greater than the distance between the two vertical plates 81. The flipping plate 9 covers the upper part of the fixing plate 8, and the connecting plates 91 are located outside the vertical plates 81. Connecting bolts 10 are provided on the connecting plates 91. Refer to Figure 17 - 18, the inner end of the connecting bolt 10 extends inwards through the vertical plate 81, and the connecting bolt 10 realizes the movable connection between the turning plate 9 and the fixed plate 8. There are two arc-shaped limiting holes 92 on the connecting plate 91, and corresponding limiting posts 82 are provided on the vertical plate 81 and are embedded in the limiting holes 92. During the turning of the turning plate 9, the position of the limiting post 82 in the limiting hole changes, and the limiting post 82 contacts the two side ends in the limiting hole 92, thereby realizing the limitation of the turning angle range of the turning plate 9. Subsequently, the limitation of the zero-gravity adjustment range is realized. The width of the bottom of the vertical plate 81 is greater than the width of the upper part of the vertical plate 81, so that the rear side of the vertical plate 81 is an inclined surface. There is a limiting surface 911 on the rear part of the connecting plate 91 that abuts against the inclined surface of the vertical plate 81. There is a protruding part 95 protruding backward on the rear side of the connecting plate 91. The rear end surface of the connecting plate above the protruding part 95 is a flat straight surface section, and the rear end surface of the connecting plate at the protruding part 22 is an arc surface section. The flat straight surface section and the arc surface section form a limiting surface. The limiting surface mainly relies on the flat straight surface section contacting and abutting against the inclined surface to limit the turning plate. The purpose of the arc surface section is to prevent the flat straight surface section from sliding during the process of abutting against the inclined surface and maintain a good limiting relationship. After abutting and limiting, the fixed plate forms a support for the turning plate, which can improve the load borne by the turning plate, improve the use effect, and improve the stability of the device. It forms a double mechanical limit for the maximum position of the zero-gravity adjustment. The fixed plate is located in the middle side at the bottom of the seat frame skeleton 1. When the seat frame skeleton 1 drives the leg support and the backrest skeleton to turn as a whole, the overall center of gravity of the support frame is at the middle side, which can avoid the center of the support frame from shifting backward excessively, thereby avoiding the support frame from tipping backward. The turning plate has a double limiting structure, effectively improving the limiting ability during zero-gravity adjustment and improving the safety of use. It can limit the center of gravity of the support frame to be in the middle of the support frame during zero-gravity adjustment and is disposed at the bottom of the seat frame skeleton 1, effectively avoiding tipping backward. When the support frame is in zero-gravity adjustment, the leg bracket can still be adjusted. The larger the opening angle of the leg bracket, the lower the center of gravity of the support frame, making the support frame stable and avoiding tipping backward. The structures of the fixed plate and the turning plate have relatively good structural strength, thereby improving the bearing capacity. The outer diameter of the limiting post 82 is the same as the aperture of the limiting hole, so that the limiting post 82 has a limiting effect on the connecting plate, can keep the connecting plate stable, and both side vertical plates 81 are well limited by the limiting posts 82, and then the stable limiting of the turning plate is realized, avoiding the left and right shaking of the turning plate and improving the stability of turning, so that the support frame is stable during zero-gravity adjustment and will not shake left and right.

[0071] Refer to Figure 17 - 18, a positioning boss 101 in the shape of a hexagonal prism is provided at the connection bolt 10 corresponding to the connecting plate 91, a hexagonal positioning hole matching the structure of the positioning boss 101 is provided at the corresponding position of the connecting plate 91, a limiting boss is provided on the bolt body of the connection bolt 10 outside the positioning boss 101, the limiting boss contacts and limits the outer side surface of the connecting plate 91, a connecting sleeve 102 matching the bolt body of the connection bolt 10 is provided at the corresponding position on the vertical plate 81, a connecting sleeve 103 is provided on the bolt body of the connection bolt 10 corresponding to the connecting sleeve 102, a limiting plate 104 is provided on the connection bolt 10 inside the connecting sleeve 103, a connecting platform in interference fit with the limiting plate 104 is provided at the corresponding position on the connection bolt 10, a cut flat groove 105 is provided at the connecting platform, the limiting plate 104 is in interference fit with the connecting platform, an inner hole matching the structure of the connecting platform is provided at the corresponding position on the limiting plate 104, the function of the cut flat groove 105 is to prevent the limiting plate from rotating at the connecting platform, thereby improving the stability of the fit of the limiting plate at the connecting platform, the length of the cut flat groove 105 in the axial direction is the same as the thickness of the limiting plate, after the limiting plate is installed in place, it limits the fit sleeve and the connecting sleeve, so that the fit between the connection bolt and the connecting sleeve is limited axially, convex platforms can be provided at both ends of the fit sleeve, and the two side convex platforms are respectively located between the connecting sleeve and the limiting plate, and between the connecting plate and the vertical plate 81, so that the connecting sleeve and the limiting plate do not contact, and the connecting plate and the vertical plate 81 do not contact, avoiding interference with the rotationality of the connection bolt, and this structure is also beneficial to controlling the axial fit accuracy of the connection bolt with the connecting plate, the vertical plate 81, and the connecting sleeve. After the limiting plate is installed, it just restricts the inner end of the connection bolt, ensuring that the connection bolt will not loosen from the connecting sleeve, and ensuring the axial fit clearance, so that the connection bolt has good mobility. The fit sleeve can improve the tightness of the fit between the connection bolt and the connecting sleeve, avoid the connection bolt from diverging and jumping axially, and make the connection bolt always rotate stably along its axis. A fastening nut is provided on the bolt body of the connection bolt 10 inside the limiting plate 104, and the fastening nut limits the limiting plate, effectively preventing the limiting plate from loosening. The connection bolt can realize the effective movable connection of the flip plate and the fixed plate, while maintaining a good fit. The tightening degree of the fastening nut will not interfere with the axial fit degree of the connection bolt. The connection area between the connection bolt and the connecting sleeve is large, the strength is high, the bearing capacity is strong, and the service life is greatly extended, effectively ensuring the use effect of the zero-gravity adjustment function of the support frame. The hexagonal prism-shaped positioning boss 101 of the connection bolt is used to limit the relative movement between the connection bolt and the flip plate, and the connection bolt rotates synchronously with the flip plate. The connection bolt only plays a role of connection and limitation axially, ensuring the connection state of the fixed plate and the flip plate. Under heavy load, the flip plate can still maintain a good flipping function. The connecting sleeve is used to prevent the deformation and wear of the connection bolt, and absorb and buffer the longitudinal force at the connection bolt. When the flip plate is loaded, the pressure at the movable connection of the flip plate and the fixed plate all acts on the connecting sleeve, avoiding the deformation of the connection bolt due to force.The number of connecting sleeves is two, which are arranged on both sides of the connecting sleeve, one on the left and the other on the right. The boss is located outside the connecting sleeve. This structure facilitates the assembly operation of the connecting sleeve, connecting bolt, and connecting sleeve. At the bottom of the front side plate 83, there is a fixed protrusion for the end of the tilting electric push rod 93 to be hinged. The output end of the tilting electric push rod 93 is connected to the bottom of the seat frame skeleton 1. A tension gas spring 94 is arranged in parallel on the side of the tilting electric push rod 94. The bottom end of the tension gas spring 94 is hinged to the hinged protrusion arranged at the front of the front side plate 83. The output end of the tension gas spring 94 is hinged to the bottom of the seat frame skeleton 1. When the output end of the tilting electric push rod ejects, the seat frame skeleton 1 is lifted as a whole, and the seat frame skeleton 1 drives the backrest skeleton to tilt as a whole to achieve the "zero gravity" adjustment. At this time, the tension gas spring extends to generate a force opposite to that of the tilting electric push rod, pulling down the seat frame skeleton 1 to reduce the thrust of the tilting electric push rod and the tilting speed of the seat frame skeleton 1, thereby improving the stability during zero gravity adjustment and enhancing safety. When the output end of the tilting electric push rod retracts, the seat frame skeleton 1 resets. At this time, the pulling force of the tension gas spring is in the same direction as the acting force of the tilting electric push rod, and the acting force of the tension gas spring always acts on the seat frame skeleton 1. Therefore, when the seat frame skeleton 1 resets, the power of the tilting electric push rod during retraction startup is reduced, protecting the tilting electric push rod from damage and prolonging its service life. The angle between the backrest skeleton and the seat frame skeleton 1 is 105°, which conforms to the ergonomic design and provides relatively good comfort. The tilting electric push rod is arranged in the middle at the bottom of the seat frame skeleton 1 to improve the smoothness during zero gravity adjustment, enhance safety, improve the support for the seat frame skeleton 1, and have an auxiliary pulling and supporting effect on the seat frame skeleton 1 to improve smoothness.,

[0072] The connecting bolt and the locking nut only play the role of connecting the tilting plate and the fixing plate, providing axial limit to the connection part to ensure the reliability of the connection. Compared with the existing pins or axles, the structural strength of this connecting bolt is higher, not easily deformed, effectively ensuring the tilting fit at the tilting plate and the fixing plate. The adjustment times of the zero gravity adjustment function are more than 100,000 times, with a long service life, ensuring the use of the zero gravity adjustment function. Refer to Figure 16 、 Figure 22The front side plate 83 is provided with a plurality of connecting and fixing holes 831, which are reserved holes for connecting the table board arranged on the side of the seat frame skeleton 1, so as to expand the use function of the comfort chair. The zero-gravity adjustment structure makes the center of gravity of the human body on the bracket move downward to the lowest point of the bracket, and transmits it to the rotating base through the flip plate and the fixing plate, so that the person on the comfort chair is in a completely relaxed state. The reclining angle of the seat frame skeleton 1 can be adjusted by flipping the electric push rod to achieve the "zero gravity" state at different angles, thereby improving the adjustability and functionality of the comfort chair. In order to improve the safety during the "zero gravity" adjustment, armrest skeletons 14 are provided on the left and right sides of the seat frame skeleton 1, and a connecting block connected to the armrest skeleton 14 is provided at the corresponding side of the seat frame skeleton rod 111. The connecting block is detachably connected to the bottom of the armrest skeleton 14 by screws, and the armrest skeleton supports the armrests of the comfort chair, thereby improving the reliability and safety of the comfort chair.

[0073] The comfortable chair bracket has the functions of "zero gravity" adjustment, backrest angle adjustment, headrest angle adjustment, leg rest angle adjustment and the like. It has rich functions, is easy to adjust and has good convenience. Moreover, the angle of the headrest is adaptively adjusted with the backrest angle adjustment, and the supporting length of the leg rest is adaptively adjusted with the opening degree of the leg rest. Compared with the existing comfortable chair frames, the comfortable chair bracket in the present invention can be adjusted in linkage, and the adjustment process conforms to ergonomic design. While the adjustment is quick and convenient, it meets the comfort requirements. It has a sophisticated and simple structure and also has the advantage of low manufacturing cost.

[0074] The leisure bracket is electrically controlled, and the control box is located in the buffer installation space. Specifically, the control box is fixed on the connecting platform on the upper end surface of the flip plate. The control box is powered by a battery, and the battery is a lithium battery pack. A battery rack is provided on the outside of the battery, and a battery rack slide detachably connected to the battery rack is provided on the connecting platform. The control box and the flip drive push rod, the leg support electric push rod, and the backrest electric push rod are powered by the battery pack. The control box is connected, and the control box is wirelessly connected to a hand controller. The wireless connection method can be controlled by WiFi, Bluetooth, infrared, etc., and the control box can be wirelessly interconnected with a mobile phone, and the adjustment action of the bracket is controlled by the mobile phone. The hand controller is provided with a crank button for controlling the flip electric push rod, the backrest electric push rod, and the leg support electric push rod. The crank button has control contacts in four directions, and one crank button can have multiple adjustment functions. Compared with the existing rocker buttons, the number of buttons can be reduced, the size of the hand controller can be reduced, and the difficulty of control operation can be reduced.

[0075] A comfortable chair includes a comfortable chair bracket as described above. Among them, a seat cushion is provided on the seat frame skeleton 1, and an elastic seat cushion cover is provided on the outer cover of the seat cushion. A leather seat cover is sleeved outside the elastic seat cushion cover. The elastic seat cushion cover facilitates the sleeving of the seat cover. A backrest cushion is provided on the backrest skeleton of the bracket. An elastic backrest cover is sleeved outside the backrest cushion. A backrest outer cover is sleeved outside the backrest cover. Multiple V-shaped air overflow grooves are provided on the backrest cushion. When the human body contacts the backrest, the air overflow grooves can quickly discharge the gas to the outside of the backrest cushion, avoiding bulging of the backrest outer cover, improving comfort, and having the function of ventilation and heat dissipation, which can quickly discharge the heat at the backrest, avoiding stuffiness and sweating at the backrest. Both the seat cushion and the backrest cushion are made of foam material.

[0076] A heating component, a first temperature sensor, and a second temperature sensor are provided inside the backrest cushion and the seat cushion. The first temperature sensor is arranged at the surface layer of the backrest cushion or the seat cushion close to the human body for detecting the surface layer temperature. The second temperature sensor is arranged inside the backrest cushion or the seat cushion close to the heating component. The second temperature sensor is used for detecting the temperature at the heating component. Under the control of the control box, the constant temperature of the surface layer temperature can be set. The first temperature sensor feeds back the surface layer temperature information to the control box. When the surface layer temperature reaches the set temperature, the control box controls the heating component to stop heating or operate at low power. The second temperature sensor is used for feeding back the temperature at the heating component to the control box to avoid the temperature of the heating component being too high and triggering its thermistor protection system, effectively maintaining the surface layer temperature, improving the accuracy of temperature control, and avoiding the phenomenon of sudden temperature changes.

[0077] Thus, the safety is improved. Buttons for controlling the heating component are provided on the hand controller, and the heating time can be set, with multiple adjustable heating time gears. An emergency stop button is also provided on the hand controller. After being pressed, it can quickly reset the straight bracket and the seat, and turn off components such as the airbag and heating. A lumbar support airbag is provided at the bottom of the backrest cushion corresponding to the human waist position. Back massage airbags are provided in the middle and upper parts of the backrest cushion. Buttons for controlling the lumbar support airbag and the back massage airbags are provided on the hand controller. The lumbar support airbag has the functions of supporting and massaging the waist, and the back massage airbags can perform back massage. A memory button is also provided on the controller, which can memorize multiple gear backrest inclination angles, leg rest angles, and "zero gravity" adjustment angles, having multiple functions and improving comfort.

[0078] The control box has a safety protection function. First, before the zero-gravity drive mechanism of the comfort chair operates, it detects the opening angle of the backrest of the comfort chair. When the angle between the backrest frame and the seat frame 1 is less than 126° (the seat frame is in the initial position), the tilting electric push rod can directly operate. The tilting electric push rod can be directly driven by the control box of the comfort chair to adjust the overall angle of the comfort chair. When the angle between the backrest frame and the seat frame 1 is 126° - 145° (the seat frame is in the initial position), the control box first automatically controls the backrest electric push rod to operate, reset the backrest, and reset the opening angle of the backrest of the comfort chair to within the safe value range less than 126°. Subsequently, the control box controls the tilting electric push rod to operate normally. First, it detects the backrest angle, and then operates the zero-gravity adjustment mechanism, effectively improving the safety during zero-gravity adjustment, keeping the center of gravity of the comfort chair bracket in the middle of the comfort chair, avoiding the backward overturning of the comfort chair when the center of gravity is too far back during zero-gravity adjustment, maintaining the overall stability of the comfort chair, and making the force on the comfort chair balanced, avoiding excessive force on the backrest or base of the comfort chair, protecting the comfort chair and extending its service life. Before the zero-gravity adjustment operation, it detects the position of the backrest and automatically adjusts it, effectively improving the safety during the use of the comfort chair. Second, when the backrest of the comfort chair is opened, it first detects whether the zero-gravity mechanism of the comfort chair is operating. Before the backrest electric push rod operates, it first detects whether the tilting electric push rod is in the closed state. When the tilting push rod is in the closed state, the backrest electric push rod can operate to the maximum stroke, and the backrest of the comfort chair can be opened to the maximum angle. When the tilting electric push rod is in operation or the output end of the tilting electric push rod has extended, the stroke of the backrest electric push rod is restricted and cannot be opened to the maximum stroke, and the backrest cannot be opened to the maximum angle, and the opening angle of the backrest is restricted, improving the safety during the use of the comfort chair;Third, before using the adjustment function of the comfort chair, monitor whether the heating function of the comfort chair is turned on. The adjustment function of the comfort chair includes the adjustment of the angle of the leg support, the adjustment of the backrest angle, and the zero-gravity adjustment. The adjustment of the leg support angle is achieved by driving the leg support with a leg electric push rod. The adjustment of the backrest angle is achieved by pushing the backrest with a backrest electric push rod. The zero-gravity adjustment is achieved by driving the overall flipping of the skeleton with a zero-gravity motor. When the electric push rod starts, it requires a large electromotive force and a large starting voltage instantaneously. The activation of the electric heating function of the comfort chair will increase the load of the power supply circuit of the comfort chair, consume a large amount of energy, and the power is prone to failure. Detect the voltage or current of the circuit of the heating component of the comfort chair. When it is detected that the heating function of the comfort chair is turned on, the control system of the comfort chair first automatically turns off the heating function of the comfort chair, cuts off the power supply of the heating component, and then the adjustment function operates normally, and the corresponding electric push rod can be used normally. Turn off the heating component with high energy consumption to ensure the electromotive force when the electric push rod starts, reduce the circuit pressure, and improve the stability and safety of the comfort chair circuit. If it is detected that the heating function of the comfort chair is turned off, the adjustment function operates normally, improving safety from the control logic aspect. The controller and the drive element also meet the direct control of a large current switch, that is, directly powered by the mains electricity, and have two power supply methods, which can be flexibly selected.;

[0079] The comfort chair adopts two power supply modes: battery power supply and external power supply. When the power is accidentally cut off and neither of the two power supply modes can supply power, after the comfort chair resumes power supply, the control box automatically locks all adjustment functions. Functions such as the backrest adjustment, zero-gravity adjustment, leg adjustment, and heating of the comfort chair cannot be operated through the control handle, and only the reset button of the control handle can be used. Press the reset button, and all adjustment functions are reset, and the comfort chair returns to the initial state to improve safety. After pressing the reset button, the backrest electric push rod, the flipping electric push rod, and the leg rest electric push rod are reset respectively to avoid danger when using again. The control box detects the capacitance value in the power supply line. When the capacitance value drops to the set value, that is, the power supply is cut off, after the power supply is restored, the control system of the comfort chair automatically locks the operation buttons of the control handle, and only the function of the reset button is normal. The RAM of the control box can record all operation records. After the power supply is restored, press the reset button. After all adjustment functions are reset, the control box unlocks other control buttons. Press the corresponding control button to call the data stored in the RAM, and a certain adjustment function of the comfort chair can be restored to the usage state before the power failure, improving convenience. In addition, the use of the airbag realizes functions with memory and can be set. The time can be freely set, or the recently used time can be memorized, improving the usage performance.

[0080] Example 2: Refer to Figure 5The headrest adjustment mechanism includes a headrest fixing plate 32 and a connecting rod 33 on the upper side of the headrest fixing plate 32. The bottom end of the connecting rod 33 is movably connected to the upper end of the headrest fixing plate 32 through a connecting shaft. A damping block 34 is sleeved on the connecting shaft. The damping block 34 is located between the fixing plate and the connecting rod. The damping block is fixed at the upper end of the fixing plate. The bottom end of the connecting rod 33 is a disc-shaped structure corresponding to the damping block. A locking nut is provided on the connecting shaft. The locking nut presses the connecting rod tightly against the damping block. The friction between the damping block and the disc-shaped structure on the connecting rod is used for positioning. The headrest frame is moved. The moving force overcomes the damping of the damping block. The connecting rod rotates and the moving force disappears. The pressing force of the damping block positions the connecting rod to maintain the angle between the connecting rod and the fixing plate. In this way, the fine adjustment of the headrest angle is achieved to improve the comfort.

[0081] Embodiment 3: The difference between this embodiment and embodiment 1 is that in this embodiment, reference Figure 21 The damping block 34 includes a first damping block 341 and a second damping block 342. The first damping block 341 is connected to the headrest fixing plate, and the second damping block 342 is connected to the connecting rod. The end surface of the second damping block 342 close to the first damping block 341 is provided with a wrapping portion 3421 covering the outside of the first damping block 341. The first damping block 341 is provided with a plurality of annular grooves 3411, and the corresponding inner wall of the wrapping portion 3421 is provided with a connecting protrusion 3422 extending into the annular groove 3411. The cooperation between the connecting protrusion 3422 and the annular groove 3411 can increase the contact area between the two damping blocks, thereby increasing the clamping force in the axial direction, so that there is sufficient friction in the circumferential direction, and the position between the connecting plate and the fixing plate can be locked.

[0082] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A comfort chair support, comprising a seat frame, a backrest frame, a headrest assembly, and a leg rest assembly, wherein the bottom end of the backrest frame is movably connected to the rear end of the seat frame frame, the seat frame frame is provided with a backrest adjustment mechanism for adjusting the inclination angle of the backrest frame, the upper part of the leg rest assembly is movably connected to the front part of the seat frame frame, and the seat frame frame is provided with a leg rest adjustment mechanism for controlling the leg rest assembly to flip forward and open, characterized in that: The headrest assembly comprises a headrest frame, an adjustment plate on the bottom side of the headrest frame, the upper end of the adjustment plate is connected to the bottom of the headrest frame, the lower part of the adjustment plate is movably connected to the upper end of the backrest frame, the lower end plate body of the adjustment plate is bent and extended toward the rear lower side of the backrest frame to form an adjustment connection end, and the left and right sides of the backrest frame are provided with linkage plates for linkage adjusting the angle between the headrest frame and the backrest frame when the inclination angle of the backrest frame is adjusted, the upper end plate body of the linkage plate is bent and extended toward the rear upper side of the backrest frame to form a linkage end, the linkage end is movably connected to the adjustment connection end of the adjustment plate, and the lower end plate body of the linkage plate is bent and extended toward the side of the seat frame frame and connected to the seat frame connecting piece arranged at the rear end of the seat frame frame. A rotating base is provided at the bottom of the seat frame skeleton, and the flipping mechanism includes a fixed plate arranged on the top of the rotating base, a flipping plate that can be flipped upward on the upper part of the fixed plate, and a flipping driving element arranged on the front side of the fixed plate. A connecting platform is provided at the bottom of the seat frame skeleton, and the upper part of the flipping plate is fixedly connected to the bottom of the connecting platform. A gap is provided between the connecting platform and the seat frame skeleton, and the gap forms a buffer installation space. The flipping plate is movably connected to the fixed plate through a movable connecting piece, and two arc-shaped limiting holes are provided at the lower part of the flipping plate. The corresponding position of the fixed plate is provided with a limiting protrusion embedded in the limiting hole. The bottom end of the flipping driving element is hingedly connected to the fixed plate, and the output end of the flipping driving element is movably connected to the seat frame skeleton. The leg support assembly includes a leg support, a leg support mounting frame on the upper side of the leg support, the leg support mounting frame is detachably connected to the front part of the seat frame frame, the upper end of the leg support is movably connected to the leg support mounting frame, the leg support adjustment mechanism includes a connecting plate, a leg support driving element on the rear side of the connecting plate, the rear end of the leg support driving element is connected to the seat frame frame, the front end of the leg support driving element is connected to the connecting plate, and the front end of the connecting plate is connected to the rear side of the upper end of the leg support. The leg bracket is also provided with a sub-bracket that slides with the leg bracket and can slide forward. The leg bracket is provided with a connecting rod mechanism that pushes the sub-bracket forward when the leg bracket is opened. The connecting rod mechanism includes a first connecting rod, a second connecting rod, and a third connecting rod that are arranged in an "N" shape. The upper end of the first connecting rod is movably connected to the seat frame through a first joint bearing, the lower end of the first connecting rod is movably connected to one end of the second connecting rod through a second joint bearing, the other end of the second connecting rod is movably connected to the upper end of the third connecting rod, the lower end of the third connecting rod is connected to the sub-bracket, and the middle part of the second connecting rod is movably connected to the leg bracket.

2. The comfortable chair bracket according to claim 1, characterized in that, The left and right sides of the auxiliary bracket are provided with slide grooves, the corresponding positions of the leg bracket are provided with sliding protrusions embedded in the slide grooves, and the front part of the seat frame skeleton is provided with connecting rod protrusions. The connecting rod protrusions and the upper end of the first connecting rod, and the movable connection between the lower end of the first connecting rod and the second connecting rod are all connected and matched through joint bearings.

3. The comfortable chair bracket according to claim 1, characterized in that, The leg rest driving element is arranged on one side at the bottom of the seat frame skeleton. The rear end of the leg rest driving element is hinged to the seat frame skeleton. The front end of the leg rest driving element is movably connected to the middle of the connecting plate through a connecting rod. A connecting protrusion movably connected to the front end of the connecting plate is arranged at the rear side of the upper end of the leg rest bracket. A guiding slot hole is formed at the rear end of the connecting plate along its length direction. A limiting wheel inserted into the guiding slot hole is arranged at the corresponding position on the bottom side of the seat frame skeleton. A second support rod is arranged at the leg rest mounting bracket. Connecting sleeves are arranged at both ends of the second support rod. A square hole is arranged at the axis center of the connecting sleeve. The corresponding part of the second support rod for the square hole is a square structure matching the square hole structure. The connecting sleeve rotates synchronously with the second support rod. The outer peripheral surface of the connecting sleeve is rotatably matched with the leg rest mounting bracket. A supporting connecting rod extending downward is arranged on the second support rod. The bottom end of the supporting connecting rod is movably connected to the middle of the connecting plate.

4. The comfortable chair bracket according to claim 1, characterized in that, The front part of the seat frame connecting piece is inserted into the rear end of the seat frame skeleton and is welded and connected to the rear end of the seat frame skeleton. A protruding seat frame connecting protrusion is arranged at the rear side of the seat frame connecting piece. A backrest protrusion movably connected to the seat frame connecting protrusion of the seat frame connecting piece is arranged at the corresponding position of the lower part of the backrest skeleton. The output end of the backrest adjusting mechanism is movably connected to the bottom end of the backrest skeleton. The end of the backrest adjusting mechanism is movably connected to the bottom side of the seat frame skeleton. The leg rest driving element and the backrest adjusting mechanism are symmetrically arranged about the middle left and right of the seat frame skeleton.

5. The comfortable chair bracket according to claim 1, characterized in that A headrest adjusting mechanism is arranged between the bottom of the headrest bracket and the adjusting plate. The headrest adjusting mechanism includes a headrest fixing plate and a connecting rod on the upper side of the headrest fixing plate. The bottom of the connecting rod is connected to the upper part of the headrest fixing plate through an angle adjusting mechanism. The bottom end of the headrest bracket is sleeved on the upper end of the connecting rod. The bottom of the headrest bracket is slidably matched with the upper end of the connecting rod. A plurality of positioning slot holes are arranged on the connecting rod in the up and down distribution. A locking hole is arranged at the lower part of the adjusting plate. A locking bolt in threaded fit is arranged at the locking hole. After the locking bolt is locked, it is inserted into the upper part of the backrest skeleton to limit the follow-up adjustment of the headrest bracket along with the backrest skeleton.

6. The comfortable chair bracket according to claim 5, wherein The upper end of the fixing plate and the lower end of the connecting rod are movably connected through a pin shaft. The angle adjusting mechanism is a damping block sleeved on the pin shaft. The damping block is located between the fixing plate and the connecting rod.

7. The comfortable chair bracket according to claim 1, characterized in that, On the left and right sides of the described fixed plate, there are vertical plates extending upward. On the left and right sides of the flipping plate, there are connecting plates extending downward. The distance between the two connecting plates is greater than the distance between the two vertical plates. The flipping plate covers the upper part of the fixed plate, and the connecting plates are located outside the vertical plates. The movable connecting member is a connecting bolt. The connecting bolt is arranged on the connecting plate, and the inner end of the connecting bolt extends inward through the vertical plate. The connecting bolt realizes the movable connection between the flipping plate and the fixed plate. An arc-shaped limiting hole is arranged on the connecting plate, and a limiting post embedded in the limiting hole is arranged at the corresponding position on the vertical plate. The limiting post contacts the end of the limiting hole to limit the flipping angle range of the flipping plate. The width of the bottom of the vertical plate is greater than the width of the upper part of the vertical plate. The rear side of the vertical plate is an inclined surface. The rear part of the flipping plate is provided with a limiting surface that abuts against the inclined surface of the vertical plate. A prismatic positioning boss is arranged on the connecting bolt corresponding to the connecting plate, and a positioning hole that structurally cooperates with the positioning boss is arranged at the corresponding position on the connecting plate. A limiting boss is arranged on the bolt body of the connecting bolt outside the positioning boss. The limiting boss contacts and limits the outer side surface of the connecting plate. A connecting sleeve that cooperates with the bolt body of the connecting bolt is arranged at the corresponding position on the vertical plate. A connecting sleeve is arranged on the bolt body of the connecting bolt corresponding to the connecting sleeve. A limiting plate is arranged on the connecting bolt inside the connecting sleeve. A connecting platform that is in interference fit with the limiting plate is arranged at the corresponding position on the connecting bolt. A fastening nut is arranged on the bolt body of the connecting bolt inside the limiting plate. The seat frame skeleton includes seat frame skeleton rods, a rear cross bar, and multiple first support rods. The rear cross bar is connected to the rear part of the seat frame skeleton rods to form a square frame for placing the seat cushion. Multiple first support rods are arranged inside the square frame. The front end of the first support rod is connected to the front end of the seat frame skeleton rod, and the rear end of the first support rod is connected to the rear cross bar. The rear end of the rod body of the first support rod and the middle part of the rod body of the rear cross bar smoothly extend downward to form the described connecting platform. The end of the flipping driving element is hingedly connected to the driving element hinged protrusion arranged at the bottom of the front side plate. The output end of the flipping driving element is movably connected to the bottom of the front end of the first support rod.

8. The comfortable chair bracket according to claim 1, wherein Armrest skeletons are arranged on the left and right sides of the described seat frame skeleton. The bottom of the armrest skeleton is detachably connected to the side of the seat frame skeleton.

9. The comfortable chair bracket according to claim 7, characterized in that, A folding table board is arranged on the side of the seat frame skeleton. The bottom of the folding table board is fixedly connected to the connection fixing hole on the front side plate.

10. The comfortable chair bracket according to claim 1, characterized in that, The included angle between the headrest frame and the backrest skeleton is 0° - 25°, and the angle adjustment range between the backrest skeleton and the seat frame skeleton is 90 - 105°.

11. The comfortable chair bracket according to claim 1, characterized in that, The described flipping drive element 、 The leg rest drive element is an electric drive mechanism or a manual drive mechanism.

12. A comfortable chair bracket according to claim 7, characterized in that, The described flipping driving element includes a flipping electric push rod and a pulling air spring arranged. The bottom ends of the flipping electric push rod and the pulling air spring are hingedly connected to the driving element hinged protrusion, and the output ends of the flipping electric push rod and the pulling air spring are hingedly connected to the bottom of the first support rod.

13. A comfortable chair bracket according to claim 1, characterized in that, The comfortable chair bracket further includes a control component, which includes a control box arranged at the buffer installation space, a power supply module for powering the control box, and the control box is connected to control the flipping drive element 、 the leg rest drive element. The control box is connected to a controller by means of wireless connection or wired connection, and control buttons for controlling the flipping drive element 、 and the leg rest drive element are provided on the controller.

14. A comfortable chair bracket according to claim 13, characterized in that, The power module is a battery. A battery rack is arranged at the buffer installation space, and the battery is detachably arranged at the battery rack.

15. A comfortable chair, characterized in that, Comprising a comfortable chair bracket as described in any one of claims 1 to 10, a seat cushion is provided on the seat frame skeleton of the bracket, an elastic seat cushion cover is provided on the outer cover of the seat cushion, a seat cover outer cover is sleeved outside the seat cushion cover, a backrest cushion is provided on the backrest skeleton of the bracket, an elastic backrest cover is sleeved outside the backrest cushion, a backrest outer cover is sleeved outside the backrest cover, multiple V-shaped air overflow grooves are provided on the backrest cushion, and massage air bags and lumbar support air bags are provided at the position corresponding to the human waist on the backrest cushion.

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