Seat waist pillow and seat backrest

Abstract

The utility model discloses a seat waist pillow and a seat backrest. The seat waist pillow comprises a movable part, a supporting rod, an adjusting assembly, a first base and a second base. The adjusting assembly comprises a rotating shaft and a long-strip-shaped elastic supporting piece, the rotating shaft is at least partially installed in the second base, the first end of the elastic supporting piece is fixed to the supporting rod, the second end of the elastic supporting piece is connected with the rotating shaft, and the second end of the elastic supporting piece stretches in the direction away from the first end or retracts in the direction close to the first end along with rotation of the rotating shaft. The elastic supporting piece has a supporting state and a relaxed state, the bending degree of the elastic supporting piece in the supporting state is larger than that in the relaxed state, and the elastic supporting piece abuts against the first base. The movable part is rotationally installed at the first end of the supporting rod, the second end of the supporting rod is rotationally connected to the rotating shaft, and a waist pillow is installed on the movable part. The waist supporting device can adapt to sitting postures of different users, and corresponding waist supporting force is provided for the different users.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of seat, concretely relates to a seat waist pillow and seat backrest. BACKGROUND

[0002] As people's daily use furniture, the seat is prone to cause the muscle fatigue, soreness of waist and back, and even the lumbar disease of the people who sit on the seat for a long time. Therefore, the seat waist pillow is needed to support the waist of the human body to reduce the stress of the waist of the human body when sitting for a long time.

[0003] However, the seat waist pillow can only adjust the position and the simple angle, and cannot adapt to the sitting posture of different users to provide the corresponding waist supporting force for different users. SUMMARY

[0004] The utility model discloses a seat waist pillow and seat backrest, which can adapt to the sitting posture of different users and provide the corresponding waist supporting force for different users.

[0005] The technical scheme is as follows:

[0006] The seat waist pillow of the utility model comprises:

[0007] The movable piece, the supporting rod, the adjusting assembly, the first base and the second base;

[0008] The adjusting assembly comprises a rotating shaft and an elastic supporting piece in the shape of a strip, the rotating shaft is at least partially installed in the second base, the first end of the elastic supporting piece is installed on the supporting rod, the second end is coupled with the rotating shaft, and the second end of the elastic supporting piece can stretch away from the first end or retract close to the first end;

[0009] The elastic supporting piece has a supporting state, when in the supporting state, the elastic supporting piece is in the shape of an arc and the side, away from the supporting rod, is abutted on the first base;

[0010] The movable piece comprises a movable rod, a first arm and a second arm, the movable rod is bent away from the supporting rod to form the first arm and the second arm, the movable rod is longitudinally arranged, the movable rod is installed at the first end of the supporting rod, the movable rod can be inclined forward or inclined backward relative to the supporting rod, the second end of the supporting rod is rotatably connected to the rotating shaft, and the first arm and the second arm are both provided with a waist pillow which is clamped and installed.

[0011] In one of the embodiments, the first end of the supporting rod is provided with two lugs, a clamping position is formed between the two lugs, the movable rod is partially embedded in the clamping position and is installed on the two lugs through a pin shaft.

[0012] In one of the embodiments, the movable rod is provided with a pin hole matched with the pin shaft, the movable rod comprises a first rod body and a second rod body, the pin hole is located on the first rod body, the second rod body has a width greater than that of the first rod body, the support rod is provided with a mounting hole below the lug, the mounting hole extends towards the movable rod to form a boss, the first end of the elastic support member is fixed on the support rod through the mounting hole, the movable member has a first position and a second position, in the first position, the bottom end of the second rod body abuts against the top end of the support rod, in the second position, the rear surface of the first rod body abuts against the boss.

[0013] In one of the embodiments, the second end of the elastic support member is provided with a rack, the rotating shaft is provided with a gear matched with the rack, the side of the elastic support member away from the gear is provided with a ball groove, the ball groove is arranged along the extension direction of the elastic support member, the second base is provided with a ball matched with the ball groove.

[0014] In one of the embodiments, the gear is arranged at the middle part of the rotating shaft, the rotating shaft is provided with connecting rods on both sides of the gear, the second end of the support rod is provided with two C-shaped clamping rings, the clamping rings are buckled on the connecting rods, the second base is provided with two support tables for supporting the connecting rods, the two support tables form an avoiding area accommodating the gear, the support tables are provided with arc-shaped recesses recessed inward.

[0015] In one of the embodiments, the top end of the arc-shaped recess is provided with a horizontal column, the horizontal column and the top end of the arc-shaped recess form a fulcrum groove, the upper end of the clamping ring is embedded in the fulcrum groove.

[0016] In one of the embodiments, the avoiding area extends downwards to the second base to form a containing part, at least part of the second end of the elastic support member is located in the containing part.

[0017] In one of the embodiments, the second base comprises a bottom plate and a cover plate, the support tables are arranged on the bottom plate, the cover plate is provided with two ring covers, the two ring covers are provided with a gap for the support rod to pass through, and the clamping ring is buckled in the ring cover.

[0018] In one of the embodiments, the first base is provided with a sliding groove and a sliding block capable of sliding in the sliding groove, and is further provided with an elastic member, one end of the elastic member is connected to the first base, the other end of the elastic member is connected to the sliding block, the outer surface of the sliding block is an outwardly curved arc surface, and in the support state, the elastic support member abuts against the arc surface.

[0019] The utility model also provides a seat backrest, comprising:

[0020] The seat support, the backrest support mounted on the seat support and the seat waist pillow of any one of the above;

[0021] The seat support comprises a first support and a second support, the second support is vertically arranged, a cavity is arranged in the second support, and the seat waist pillow is fixed in the cavity.

[0022] The technical scheme provided by the utility model has the following advantages and effects:

[0023] The waist pillow is mounted on the movable piece, the movable piece is rotatably mounted on the supporting rod, the angle of the waist pillow can be adjusted according to the sitting posture of different users; the supporting rod is rotatably connected with the rotating shaft in the second base, the elastic supporting piece is stretched or retracted through the rotating shaft, the bending degree of the elastic supporting piece is adjusted, the greater the bending degree is, the greater the thrust of the elastic supporting piece on the supporting rod is, so that the forward thrust of the elastic supporting piece on the supporting rod and the inclination angle of the supporting rod are changed. When a user sits on the seat, the first base abuts against the elastic supporting piece, so as to provide support force for the waist of the user. Therefore, different users can adjust the waist support force through the rotating shaft according to needs, so as to provide corresponding waist support force for different users. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a perspective view of the seat backrest of the utility model embodiment;

[0025] Figure 2 It is a perspective view of the seat waist pillow of the utility model embodiment;

[0026] Figure 3 It is a side view of the seat waist pillow of the utility model embodiment;

[0027] Figure 4 It is a perspective view of the movable piece in the seat waist pillow of the utility model;

[0028] Figure 5 It is a first perspective view of the supporting rod in the seat waist pillow of the utility model;

[0029] Figure 6 It is a second perspective view of the supporting rod in the seat waist pillow of the utility model;

[0030] Figure 7 It is a perspective view of the rotating shaft in the seat waist pillow of the utility model;

[0031] Figure 8 It is an exploded view of the seat waist pillow of the utility model;

[0032] Figure 9 It is a perspective view of the bottom plate of the second base of the seat waist pillow of the utility model;

[0033] Figure 10 It is the perspective view of the cover plate of the seat waist pillow of the utility model;

[0034] Figure 11 It is the front view of the first base of the seat waist pillow of the utility model;

[0035] Figure 12 It is Figure 11 It is the middle A-A sectional view;

[0036] Figure 13 It is the rear view of the part seat waist pillow of the utility model.

[0037] Mark explanation:

[0038] 100, seat backrest, 110, seat support, 111, first support, 112, second support, 1121, cavity, 120, backrest support,

[0039] 200, seat waist pillow,

[0040] 210, support rod, 211, first end, 212, second end, 213, lug, 214, clamping position, 215, through hole, 216, mounting hole, 217, boss, 218, snap ring,

[0041] 220, adjusting assembly, 221, rotating shaft, 2210, gear, 2211, connecting rod, 2212, handle, 222, elastic support, 2221, rack, 2222, ball groove,

[0042] 230, first base, 231, sliding groove, 232, sliding block, 2321, arc surface, 233, elastic member,

[0043] 240, second base, 241, bottom plate, 2411, support table, 2412, avoidance area, 2413, arc-shaped groove, 2414, cross column, 2415, fulcrum groove, 2416, connecting plate, 2417, mounting hole, 2418, accommodating portion, 242, cover plate, 2421, ring cover, 2422, baffle, 2423, accommodation gap, 243, ball, 244, mounting column,

[0044] 250, movable piece, 251, movable rod, 252, first arm, 253, second arm, 254, buckle, 255, pin hole, 256, first rod body, 257, second rod body,

[0045] 260, waist pillow. DETAILED DESCRIPTION

[0046] For the convenience of understanding the utility model, the specific embodiments of the utility model will be described in more detail below with reference to the accompanying drawings of the description.

[0047] Unless specifically stated or otherwise defined, the "first, second" used in the present text is merely used for distinguishing names, and does not represent the specific quantity or order.

[0048] Unless specifically stated or otherwise defined, the term "and / or" used in the present text includes any and all combinations of one or more related listed items.

[0049] It should be noted that "fixed to", "connected to" in the present text can be directly fixed or connected to an element, or indirectly fixed or connected to an element.

[0050] In view of the problem that the current seat waist pillow cannot provide corresponding waist supporting force for different users and adapt to the sitting posture of different users, the utility model provides a seat waist pillow, the waist pillow is installed on a movable piece, the movable piece is rotatably installed on a supporting rod, and the angle of the waist pillow can be adjusted to adapt to the sitting posture of different users; when the elastic supporting piece is bent, a forward thrust (when a user sits on a seat, the direction of the back of the user to the front of the user is forward) acting on the supporting rod is generated. The bending degree of the elastic supporting piece is adjusted by rotating the rotating shaft, and the greater the bending degree is, the greater the thrust acting on the supporting rod is. Therefore, different users can adjust the elastic supporting piece to different bending degrees, and the corresponding waist supporting force is realized.

[0051] The seat waist pillow of the embodiment is used for being installed on a seat backrest, and the installed seat backrest is as shown in Figure 1 The seat backrest 100 mainly comprises a seat support 110, a backrest support 120 and a seat waist pillow 200. The backrest support 120 and the seat support 110 can be separate, the backrest support 120 is installed on the seat support 110, or the backrest support 120 and the seat support 110 can be integrally formed. The seat support 110 comprises a first support 111 arranged horizontally and a second support 112 arranged vertically, the second support 112 is similar to a Y-shaped, the second support 112 is internally hollowed out to form a cavity 1121, and the seat waist pillow 200 is fixed in the cavity 1121. It should be noted that the seat waist pillow 200 of the embodiment is not limited to being installed on the seat backrest 100 as shown in Figure 1 The seat backrest 100, and can be installed on other types of seat backrests.

[0052] As shown in Figure 2 , Figure 3As shown, the lumbar support 200 mainly includes a support rod 210, an adjustment assembly 220, a first base 230, a second base 240, and a movable component 250. The support rod 210 has a first end 211 and a second end 212. The movable component 250 is longitudinally arranged and rotatably mounted on the first end 211 of the support rod 210. The lumbar support 260 is mounted on the movable component 250. Through this rotatable connection, the movable component 250 can tilt forward or backward relative to the support rod 210, thereby flexibly adjusting the angle of the lumbar support 260 to adapt to different users' sitting postures. Specifically, as... Figure 4 As shown, this embodiment includes two lumbar pillows 260. The movable component 250 includes a movable rod 251, a first arm 252, and a second arm 253. The movable rod 251, the first arm 252, and the second arm 253 are integrally formed. The two ends of the movable rod 251 are bent away from the support rod 210 to form the first arm 252 and the second arm 253. The ends of the first arm 252 and the second arm 253 are provided with C-shaped buckles 254. The two lumbar pillows 260 are respectively fastened to the first arm 252 and the second arm 254 by the buckles 254, and the lumbar pillows 260 can rotate relative to the first arm 252 and the second arm 253, making the angle adjustment of the lumbar pillows 260 more flexible. It is easy to understand that one lumbar pillow 260 can also be installed on the movable component 250. Compared with one lumbar pillow 260, installing two lumbar pillows 260 can provide more comfortable support for the waist.

[0053] like Figure 5 and Figure 6 As shown, the first end 211 of the support rod 210 is provided with two lugs 213 opposite to each other, and a snap-fit ​​position 214 is formed between the two lugs 213. The lugs 213 are provided with through holes 215, and the movable rod 251 is provided with pin holes 255. The movable rod 251 is partially embedded in the snap-fit ​​position 214, and the support rod 210 and the movable rod 251 are rotatably connected by a pin through the through hole 215 and the pin hole 255.

[0054] refer to Figure 4 To limit the rotation of the movable rod 251 relative to the support rod 210, the movable rod 251 is designed to include a first rod body 256 and a second rod body 257. The width of the second rod body 257 is greater than the width of the first rod body 256, thus forming a shoulder at the connection point between the second rod body 257 and the first rod body 256. The pin hole 255 is located on the first rod body 256. When the movable part 250 tilts backward (i.e., in the first position), the bottom end of the second rod body 257 abuts against the top end of the support rod 210 to prevent excessive tilting backward. (Reference) Figure 5 and Figure 6The support rod 210 is plate-shaped and is located below the lug 213. The support rod 210 is provided with a mounting hole 216, which extends towards the movable rod 215 to form a boss 217. The first end of the elastic support 222 is fixed to the support rod 210 through the mounting hole 216 by using a fastener. When the movable member 250 is tilted forward (i.e., the second position), the rear surface of the first rod body 256 abuts against the boss 217 to prevent excessive tilting forward.

[0055] The adjusting assembly 220 mainly includes a rotating shaft 221 and an elastic support 222, which are used to adjust the inclination angle of the support rod 210 and the forward thrust acting on the support rod 210. The first base 230 and the second base 240 are used to be mounted on the seat support 110. After being mounted, as shown in Figure 1 , the first base 230 is located above the second base 240. After being mounted on the seat support 110, the first base 230 serves as an abutting object of the adjusting assembly 220, and the second base 240 forms a fixed seat of the seat headrest 200. The support rod 210 is rotatable forward and backward relative to the second base 240.

[0056] The elastic support 222 in the adjusting assembly 220 is long-strip-shaped, and the rotating shaft 221 is mounted in the second base 240. As shown in Figure 7 , the middle part of the rotating shaft 221 is provided with a gear 2210, and the two sides of the gear 2210 are provided with connecting rods 2211. The connecting rods 2211 are further connected with handles 2212. The mounting mode of the gear 2210, the connecting rods 2211 and the handles 2212 is not limited. The gear 2210, the connecting rods 2211 and the handles 2212 can be fixed by using fasteners or can be bonded by using glue. The rotating shaft 221 is rotated by rotating the handles 2212. Figure 5 Figure 6 As shown in, the second end of the support rod 210 extends to both sides to form two C-shaped clamping rings 218, which are buckled on the connecting rods 2211, so that the support rod 210 is mounted on the rotating shaft 221. In this buckling mode, the support rod 210 can rotate forward and backward relative to the rotating shaft 221.

[0057] Referring to Figure 8 , the second base 240 includes a bottom plate 241 and a cover plate 242. Referring to Figure 9The bottom plate 241 is provided with two support tables 2411, and the support tables 2411 are used to support the connecting rods 2211 when the rotating shaft 221 is installed on the second base 240. The two support tables 2411 form an avoiding area 2412 between them, which is used to accommodate the gear 2210. The clasp ring 218 buckled on the rotating shaft 221 is correspondingly located at the position of the support tables 2411. In order to enable the support rod 210 to rotate, the support tables 2411 are provided with inwardly recessed arc-shaped grooves 2413. The arc-shaped grooves 2413 can provide the space required when the clasp ring 218 rotates. Preferably, the top end of the arc-shaped groove 2413 is provided with a cross column 2414, and the cross column 2414 and the top end of the arc-shaped groove 2413 form a fulcrum groove 2415. The upper end of the clasp ring 218 is embedded in the fulcrum groove 2415. When the clasp ring 218 rotates, it can rotate with the upper end of the clasp ring 218 and the contact point of the cross column 2414 as the fulcrum, and the rotation is more stable. The fulcrum groove 2415 can limit the left and right movement of the clasp ring 218, and the rotating shaft 221 will not deviate left and right when it rotates.

[0058] As shown in Figure 10 , the cover plate 242 is provided with two ring covers 2421, and the outer side of the ring cover 2421 is provided with a baffle 2422. The two ring covers 2421 are provided with a gap 2423 for accommodating the support rod 210. When installed, the clasp ring 218 is buckled in the ring cover 2421 and the ring cover 2421 does not affect the rotation of the clasp ring 218.

[0059] As shown in Figure 8 , the first end of the elastic support 222 is fixed on the support rod 210, and the second end is provided with a rack 2221 for engaging with the gear 2210 on the rotating shaft 221. With the rotation of the rotating shaft 221, the second end of the elastic support 222 stretches away from the first end or retracts towards the first end. That is, with the rotation of the rotating shaft 221, the length between the first end of the elastic support 222 and the engagement point of the rack 2221 and the gear 2210 changes. Since the first end of the elastic support 222 is fixed on the support rod 210, when the length between the first end of the elastic support 222 and the engagement point of the rack 2221 and the gear 2210 becomes longer, the bending degree of the elastic support 222 becomes larger. The greater the bending degree of the elastic support 222, the greater the forward thrust acting on the support rod 210. When the user sits on the seat, the bending degree of the elastic support 222 is adjusted by the rotating shaft 221 to change the waist support provided by the lumbar pillow 211; when not sitting on the seat, the forward thrust acting on the support rod 210 will make the support rod 210 rotate forward, and the bending degree of the elastic support 222 is adjusted by the rotating shaft 221 to change the inclination angle of the support rod 210.

[0060] When the user sits on the seat, the user will give the support rod 210 a backward pushing force, and a corresponding backward pushing force is generated on the elastic support 222. According to the balance of forces, the first base 230 for being mounted on the seat support 110 is designed in this embodiment. After the elastic support 222 abuts against the first base 230, the first base 230 can provide a corresponding supporting force, that is, a reaction force, to realize the supporting effect of the waist pillow 211. That is, the elastic support 222 has a supporting state and a relaxed state. In the supporting state, the elastic support 222 needs to provide the supporting force for the waist. At this time, the bending degree of the elastic support 222 is greater than that in the relaxed state. The elastic support 222 is in an arc shape, and at this time, the side of the elastic support 222 away from the support rod 210 (that is, the outer side of the arc shape) abuts against the first base 230. In the relaxed state, the bending degree of the elastic support 222 is small, and at this time, the elastic support 222 is separated from the first base 230. Therefore, when the user sits on the seat, the bending degree of the elastic support 222 can be adjusted by rotating the rotating shaft 221 to adjust the supporting force for the waist. The first base 230 can be a separate component that can be mounted on the seat support 110, or can be a protrusion provided on the seat support 110.

[0061] As shown in Figure 11 and Figure 12 , the first base 230 of this embodiment is provided with a sliding groove 231 and a sliding block 232. The sliding block 232 can slide in the sliding groove 231. The outer surface of the sliding block 232 is an outwardly curved arc surface 2321. In the supporting state, the elastic support 222 abuts against the arc surface 2321. In order to prevent the rotating shaft 221 from rotating beyond the stroke of the elastic support 222, causing the elastic support 222 to disengage from the meshing between the gear 2210, an elastic member 233 is also provided. One end of the elastic member 233 is connected to the sliding block 232, and the other end is connected to the top wall of the first base 230. When the rotating shaft 221 is rotated to cause the elastic support 222 to retract towards the first end of the elastic support 222 (that is, to become more curved), the elastic support 222 abuts against the arc surface 2321, which will push the sliding block 232 to slide upwards so that the elastic member 233 is compressed. When the elastic member 233 is compressed to a certain extent, the counteracting force of the elastic member 233 will cause the elastic support 222 to stretch in the direction away from the first end.

[0062] As shown in Figure 13 , in order to limit the stretching of the elastic support 222 away from the first end when adjusted to the position, a ball groove 2222 is provided on the side of the elastic support 222 away from the gear 2210. The ball groove 2222 is arranged in the stretching direction of the elastic support 222. The second base 240 is provided with a ball 243 cooperating with the ball groove 2222. Specifically, as shown in Figure 8 and Figure 9As shown, the second base 240 is provided with a mounting hole 2417 on the connecting plate 2416 between the two support tables 2411, and the ball 243 is fixed on the mounting column 244 which is fitted into the mounting hole 2417. The extension or retraction of the elastic support 222 is limited by the ball 243 embedded in the ball groove 2222, and the state adjusted by the user is maintained. In this state, when the user sits on the seat, the elastic support 222 is adjusted in bending form by the reaction force of the first base 230 when the elastic support 222 is stressed; when the user gets up and leaves the seat, the elastic support 222 pushes the support rod 210 to rotate forward to achieve force balance.

[0063] As shown in the drawings, Figure 9 As shown, in order to prevent the second end of the elastic support 222 from shifting left and right when it is extended or retracted, causing the meshing of the elastic support 222 and the gear 2210 to fail, the second base 240 is extended downward from the second base 240 to form a receiving portion 2418, the shape of the receiving portion 2418 is matched with the outer shape of the second end of the elastic support 222, and at least part of the second end of the elastic support 222 is located in the receiving portion 2418. The extension or retraction direction of the elastic support 222 is limited by the receiving portion 2418.

[0064] It should be noted that the movable connection mode of the elastic support and the shaft is not limited to the meshing of the gear and the rack in the embodiment, and other structures that can realize the extension or retraction function of the elastic support can also be used, such as chain and gear, screw and nut, etc.

[0065] In some examples, the elastic support 222 is provided with a plurality of elastic supports 222, and the shaft 221 is provided with a plurality of gears 2210, each gear 2210 is meshed with a rack 2221 on an elastic support 222. The plurality of elastic supports 222 can improve the service life of the seat backrest.

[0066] In summary, the support rod in the embodiment is used to install the backrest to form the leaning of the waist, the bending degree of the elastic support is adjusted by the shaft on the second base, the greater the bending degree of the elastic support, the greater the support force on the waist. After adjusting the bending degree of the elastic support, the extension or retraction of the elastic support is limited by the ball, the elastic support abuts against the first base to provide the support force on the waist. The corresponding waist support force can be provided according to different users. That is, the angle and support force of the waist support can be adjusted according to different user groups or different sitting postures, so as to solve the problems of the spine and lumbar vertebrae caused by long sitting, and provide better use experience for consumers.

[0067] The above embodiments are not exhaustive enumeration based on the utility model, in addition, there can be a plurality of other embodiments not listed. Any replacement and improvement made without violating the concept of the utility model is within the scope of protection of the utility model.

Claims

1. A seat headrest, characterized by, The utility model provides a kind of adjustable car seat, including: movable element, support rod, adjusting assembly, first base and second base; The adjusting assembly includes a rotating shaft and an elongated elastic support, the rotating shaft is at least partially installed in the second base, the first end of the elastic support is installed on the support rod, and the second end is coupled with the rotating shaft, the second end of the elastic support can be stretched away from the first end or retracted towards the first end; The elastic support has a support state, when in the support state, the elastic support is arc-shaped and the side away from the support rod abuts on the first base; The movable element includes a movable rod, a first arm and a second arm, the movable rod is bent away from the support rod to form the first arm and the second arm, the movable rod is longitudinally arranged, the movable rod is movably installed on the first end of the support rod, the movable rod can be tilted forward or tilted backward relative to the support rod, the second end of the support rod is rotatably connected to the rotating shaft, and the first arm and the second arm are both equipped with a headrest. The first end of the support rod is oppositely provided with two lugs, a clamping position is formed between the two lugs, the movable rod is partially embedded in the clamping position and is installed on the two lugs through a pin shaft.

2. The seat headrest according to claim 1, wherein The movable rod is provided with a pin hole matched with the pin shaft, the movable rod includes a first rod body and a second rod body, the pin hole is located in the first rod body, the width of the second rod body is greater than that of the first rod body, the support rod is provided below the lugs with a mounting hole, the mounting hole extends towards the movable rod to form a boss, the first end of the elastic support is fixed on the support rod through the mounting hole, and the movable element has a first position and a second position, in the first position, the bottom end of the second rod body abuts on the top end of the support rod, and in the second position, the rear surface of the first rod body abuts on the boss.

3. The seat headrest according to claim 2, wherein The second end of the elastic support is provided with a rack, the rotating shaft is provided with a gear engaged with the rack, the side of the elastic support away from the gear is provided with a ball groove, the ball groove is arranged along the stretching direction of the elastic support, and the second base is provided with a ball matched with the ball groove.

4. The seat headrest according to claim 1, wherein The gear is arranged in the middle of the rotating shaft, the rotating shaft is provided with connecting rods on both sides of the gear, the second end of the support rod is provided with two C-shaped clamping rings, the clamping rings are buckled on the connecting rods, the second base is provided with two support tables for supporting the connecting rods, an avoidance area accommodating the gear is formed between the two support tables, and the support table is provided with an arc-shaped recess recessed inward.

5. The seat headrest according to claim 4, wherein The top end of the arc-shaped recess is provided with a horizontal column, the horizontal column and the top end of the arc-shaped recess form a fulcrum groove, and the upper end of the clamping ring is embedded in the fulcrum groove.

6. The seat headrest according to claim 5, wherein The avoidance area extends downwards to the second base to form a containing portion, and at least part of the second end of the elastic support is located in the containing portion.

7. The seat headrest according to claim 5, wherein ​ 8. The seat headrest according to claim 5, wherein The second base comprises a bottom plate and a cover plate, the supporting table is arranged on the bottom plate, the cover plate is provided with two ring covers, a gap is arranged between the two ring covers for the supporting rod to pass through, and the clamping ring is buckled in the ring cover.

9. The seat headrest according to any one of claims 1 to 8, wherein The first base is provided with a sliding groove and a sliding block capable of sliding in the sliding groove, and is further provided with an elastic member, one end of the elastic member is connected to the first base, the other end is connected to the sliding block, the outer surface of the sliding block is an outwardly curved arc surface, and in the supporting state, the elastic supporting member abuts against the arc surface.

10. A seat back characterized by, Comprising: A seat support, a backrest support mounted on the seat support, and a seat waist pillow according to any one of claims 1-9; The seat support comprises a first support and a second support, the second support is vertically arranged, the second support is provided with a cavity, and the seat waist pillow is fixed in the cavity.

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