Pneumatic four-way headrest

Abstract

The utility model relates to a kind of pneumatic four-way headrest, comprising: the headrest rod being installed on seat framework, four-way headrest being installed on headrest rod, the four-way headrest is pneumatic four-way headrest, the pneumatic four-way headrest includes: Z direction lifting mechanism, X direction adjusting mechanism driven by transverse air bag, wherein, the Z direction lifting mechanism is installed on headrest rod and drives headrest casing to move up and down along vertical direction, the X direction adjusting mechanism is installed on Z direction lifting mechanism and drives headrest casing to move along front-back direction;The utility model has the advantages that: by air bag and coil spring as the four-way adjustment power of headrest, the weight of headrest is reduced, and fundamentally eliminates motor noise and motor vibration when electric headrest is adjusted.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to a pneumatic four-way headrest. Background Technology

[0002] Headrests, as an important component of car seats, primarily serve to ensure the neck safety of drivers and passengers and enhance seating comfort. With continuous technological advancements, most high-end car seat headrests now feature electric adjustment. However, most electric headrests currently employ motors and gears for transmission. The presence of these mechanisms results in a relatively heavy overall weight, increasing the risk of whiplash injury to occupants. Furthermore, vibration and noise during motor adjustment are unavoidable. Utility Model Content

[0003] In view of the above problems, the purpose of this utility model is to provide a pneumatic four-way headrest that uses an air bag and a coil spring to achieve front-to-back and up-and-down adjustment of the headrest, without using a motor or gear structure, thus fundamentally overcoming the shortcomings of the above-mentioned prior art.

[0004] This utility model provides a pneumatic four-way headrest, comprising: a headrest rod mounted on a seat frame, and a four-way headrest mounted on the headrest rod. The improvement is that the four-way headrest is a pneumatic four-way headrest, which includes: a Z-axis lifting mechanism and an X-axis adjustment mechanism driven by a transverse air bag. The Z-axis lifting mechanism is mounted on the headrest rod and drives the headrest shell to move up and down in the vertical direction. The X-axis adjustment mechanism is mounted on the Z-axis lifting mechanism and drives the headrest shell to move in the front-back direction.

[0005] As a preferred embodiment of this utility model, the X-direction adjustment mechanism includes: an X-direction adjustment airbag fixedly connected to the headrest frame in a horizontal square shape and located between the headrest front shell and the headrest frame; an X-direction airbag guide rod for guiding the inflation and deflation of the X-direction adjustment airbag; a transverse coil spring for controlling the headrest front shell to drive the headrest front shell in the opposite direction of the X-direction adjustment airbag; and a headrest shell connecting frame slidably connected to the headrest frame in the X direction and fixedly connected to the headrest front shell. The bottom coil spring bearing of the transverse coil spring is fixedly connected to the headrest frame, and the end of the coil spring band of the transverse coil spring is fixedly connected to the headrest front shell. The X-direction adjustment airbag inflates and extends forward, supporting the headrest front shell as it moves forward in the X direction. At the same time, the coil spring band of the transverse coil spring unfolds under the drive of the headrest front shell. When the headrest front shell is adjusted backward, the X-direction adjustment airbag deflates and releases pressure, driving the headrest front shell to move backward in the X direction under the reset tension of the transverse coil spring.

[0006] As a preferred embodiment of this utility model, the headrest housing connecting frame includes: four rectangularly arranged through holes opened laterally on the headrest frame; X-direction adjusting guide rods slidably connected in the four through holes; and guide rod bushings fitted on the X-direction adjusting guide rods and slidably connected in the through holes. The first ends of the four parallel X-direction adjusting guide rods are fixed to the inner wall of the front headrest housing, and the tail ends of the four parallel X-direction adjusting guide rods are fixed to the guide rod fixing frame. The guide rod fixing frame is located on the side of the headrest frame away from the front headrest housing. The front headrest housing moves forward and backward along the X-direction on the headrest frame through the headrest housing connecting frame.

[0007] As a preferred embodiment of this utility model, the bottom of the X-direction adjustable airbag is adhered and fixed to the side of the headrest frame and located on the side close to the front shell of the headrest. The X-direction adjustable airbag is connected to the air source of the car seat. The air source is used to inflate and deflate the X-direction adjustable airbag and drive the X-direction adjustable airbag to unfold or retract. The bottom spring bearings of the two transverse coil springs are respectively fixed to the side walls of the headrest frame, and the spring ends of the two transverse coil springs are fixed to the inner wall of the front shell of the headrest.

[0008] As a preferred embodiment of this utility model, a set of X-direction airbag guide rods are horizontally fixed to the headrest frame and located around the X-direction adjustable airbag. The outer wall of the X-direction adjustable airbag is provided with guide holes that fit onto the X-direction airbag guide rods. The extension and retraction of the X-direction adjustable airbag is guided by the X-direction airbag guide rods.

[0009] As a preferred embodiment of this utility model, the Z-axis lifting mechanism includes: a top fixing plate fixedly connected to the top of the two headrest rods; a headrest frame fitted onto the headrest rods and sliding on the headrest rods; a Z-axis adjusting air bag fixedly connected to the headrest frame and located between the headrest frame and the top fixing plate; a Z-axis air bag guide rod for guiding the inflation and deflation of the Z-axis adjusting air bag; and a vertical coil spring for controlling the headrest frame to drive in the opposite direction of the Z-axis adjusting air bag. The bottom coil spring bearing of the vertical coil spring is fixedly connected to the headrest frame, and the end of the coil spring band is fixedly connected to the top fixing plate. When the Z-axis adjusting air bag is inflated and extends upward, it presses against the top fixing plate and drives the headrest frame to move downward on the headrest rods under the action of the counter-thrust. At the same time, the coil spring band of the vertical coil spring unfolds under the action of the headrest frame. When the headrest frame is adjusted upward, the Z-axis adjusting air bag deflates and releases pressure, driving the headrest frame to move upward under the reset tension of the vertical coil spring.

[0010] As a preferred embodiment of this utility model, the headrest frame is a frame, the bottom of the Z-axis adjustment air bag is glued and fixed to the upper surface of the headrest frame, the Z-axis adjustment air bag is connected to the air source of the car seat, the air source is used to inflate and deflate the Z-axis adjustment air bag and drive the Z-axis adjustment air bag to unfold or retract, the bottom spring bearings of the two vertical coil springs are respectively fixed to the side walls of the headrest frame near the bottom, and the spring ends of the two vertical coil springs are fixed to the sides of the top fixing plate.

[0011] As a preferred embodiment of this utility model, a set of Z-direction airbag guide rods are vertically fixed to the bottom of the top fixing plate and located around the Z-direction adjusting airbag. The outer wall of the Z-direction adjusting airbag is provided with guide holes that fit onto the Z-direction airbag guide rods. The extension and retraction of the Z-direction adjusting airbag are guided by the Z-direction airbag guide rods.

[0012] As a preferred embodiment of this utility model, the front shell of the headrest and the rear shell of the headrest are fixedly connected to form the headrest shell.

[0013] As a preferred embodiment of this utility model, it also includes an inertia lock, which is used to buffer the headrest pressure in the X direction. The inertia lock includes: a bolt hole or a nut with a bolt hole opened laterally on the headrest frame; a lead screw threaded into the bolt hole and arranged in the X direction; a lead screw end self-rotating seat fixed inside the front housing of the headrest; one end of the lead screw extends into the lead screw end self-rotating seat and is locked in the lead screw end self-rotating seat by a retaining ring fixed to the lead screw end and can rotate in the lead screw end self-rotating seat.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model uses an air bag and a coil spring as the four-way adjustment power for the headrest. Compared with motor drive, it reduces the weight of the headrest and fundamentally eliminates motor noise and vibration during electric headrest adjustment.

[0016] 2. This utility model can achieve up-and-down and forward-and-back adjustment of the headrest by using only two air bags and a coil spring, making four-way adjustment control more convenient and reducing the failure rate.

[0017] 3. This utility model guides the expansion and contraction of the air bag by adding a guide rod, ensuring stability during four-way adjustment.

[0018] 4. In this utility model, guide rod bushings are arranged on the headrest shell connecting frame to ensure the clearance and sway of the X-direction adjustment guide rod when it passes through the hole of the headrest frame, so as not to produce obvious sway during front and back adjustment. In addition, the tail ends of the four X-direction adjustment guide rods of the headrest shell connecting frame are fixed by guide rod fixing brackets to ensure the relative parallelism and stability of the four X-direction adjustment guide rods during movement.

[0019] 5. This utility model uses a lead screw and nut as an inertial lock to reduce the whiplash effect and its impact on the occupants. Attached Figure Description

[0020] Figure 1 This is an exploded view of the overall structure of the headrest in the embodiment.

[0021] Figure 2 This is a schematic diagram of the overall structure of the shell after removing the headrest, as shown in the embodiment.

[0022] Figure 3 This is a schematic diagram of the overall structure of the headrest housing and guide rod fixing frame after removing the headrest in this embodiment.

[0023] Figure 4 This is a schematic diagram of the installation structure of the headrest front housing, X-axis adjustment guide rod, and lateral coil spring in an embodiment.

[0024] Figure 5 This is a schematic diagram of the installation structure of the headrest front shell, headrest frame, and headrest shell connecting frame in an embodiment.

[0025] Figure 6 This is a schematic diagram of the installation structure of the headrest frame and the headrest shell connecting bracket in an embodiment.

[0026] Figure 7 This is a schematic diagram of the headrest front shell, headrest frame, and inertia lock installation structure in an embodiment.

[0027] Figure 8 The front view of the headrest front shell, headrest frame, and inertia lock mounting structure is shown in the embodiment.

[0028] Figure 9 for Figure 8 AA sectional view.

[0029] Reference numerals in the attached drawings: 1. Headrest rod; 2. Top fixing plate; 3. Headrest frame; 4. Z-direction adjusting air bag; 5. Z-direction air bag guide rod; 6. Vertical coil spring; 7. Front headrest housing; 8. X-direction adjusting air bag; 9. X-direction air bag guide rod; 10. Horizontal coil spring; 11. Through hole; 12. X-direction adjusting guide rod; 13. Guide rod bushing; 14. Guide rod fixing bracket; 15. Nut; 16. Lead screw; 17. Lead screw end self-rotating seat; 18. Snap ring; 19. Rear headrest housing. Detailed Implementation

[0030] See Figure 1-9As shown, this embodiment provides a pneumatic four-way headrest, including: a headrest rod 1 installed on the seat frame, and a pneumatic four-way headrest installed on the headrest rod 1. The pneumatic four-way headrest includes: a Z-axis lifting mechanism driven by a Z-axis adjusting air bag, and an X-axis adjusting mechanism driven by a transverse air bag. The Z-axis lifting mechanism is installed on the headrest rod 1 and drives the headrest shell to move up and down in the vertical direction. The X-axis adjusting mechanism is installed on the Z-axis lifting mechanism and drives the headrest shell to move in the front and back direction. The Z-axis lifting mechanism includes: a top fixing plate 2 fixed to the top of the two headrest rods 1; a headrest frame 3 fitted onto and sliding on the headrest rods 2; a Z-axis adjusting air bag 4 fixed to the headrest frame 3 and located between the headrest frame 3 and the top fixing plate 2; a Z-axis air bag guide rod 5 for guiding the inflation and deflation of the Z-axis adjusting air bag 4; and vertical coil springs 6 for controlling the headrest frame 3 to drive in the opposite direction of the Z-axis adjusting air bag 4. The bottom coil spring bearings of the two vertical coil springs 6 are fixed to the side walls of the headrest frame 3 near the bottom. The two vertical coil springs 6 are fixed to the two sides of the top fixed plate 2. The Z-direction adjusting air bag 4 is inflated and extends upward to support the top fixed plate 2. Under the action of the counter-thrust, it drives the headrest frame 3 to move downward on the headrest rod 1, thus realizing the downward adjustment of the headrest. At the same time, the coil springs of the two vertical coil springs 6 are unfolded under the action of the headrest frame 3 (overcoming the elasticity of the coil springs). When the headrest frame 3 is adjusted upward, the Z-direction adjusting air bag 4 is depressurized and, under the reset pull of the two vertical coil springs 6, it drives the headrest frame 3 to move upward, thus realizing the upward adjustment of the headrest. The X-axis adjustment mechanism includes: an X-axis adjustment airbag 8 horizontally and squarely fixed to the headrest frame 3 and located between the headrest front shell 7 and the headrest frame 3; an X-axis airbag guide rod 9 for guiding the inflation and deflation of the X-axis adjustment airbag 8; a transverse coil spring 10 for controlling the headrest front shell 7 to drive in the opposite direction of the X-axis adjustment airbag 8; and a headrest shell connecting frame slidably connected to the headrest frame 3 and fixed to the headrest front shell 7 in the X-axis direction. The bottom coil spring bearing of the transverse coil spring 10 is fixed to the headrest frame, and the bottom coil spring bearings of the two transverse coil springs 10 are respectively fixed to the headrest frame. On the two side walls of 3, the ends of the spring bands of the two transverse coil springs 10 are fixed to the inner wall of the front shell 7 of the headrest. The transverse coil springs 10 are set perpendicular to the vertical coil springs 6. The X-direction adjustment air bag 9 is inflated and extends forward, supporting the front shell 7 of the headrest to move forward in the X direction, thus realizing the forward adjustment of the headrest. At the same time, the spring bands of the two transverse coil springs 10 are unfolded under the drive of the front shell 7 of the headrest (overcoming the elasticity of the coil springs). When the front shell 7 of the headrest is adjusted backward, the X-direction adjustment air bag 9 is deflated and depressurized. Under the reset pull of the two transverse coil springs 10, the front shell 7 of the headrest is driven to move backward in the X direction, thus realizing the backward adjustment of the headrest.

[0031] Furthermore, in this embodiment, the headrest frame 3 is a frame. The bottom of the Z-axis adjustment airbag 4 is fixed to the upper surface of the headrest frame 3 with double-sided tape, and the bottom of the X-axis adjustment airbag 8 is fixed to the side of the headrest frame 3 with double-sided tape and located on the side close to the front shell 7 of the headrest. The Z-axis adjustment airbag 4 and the X-axis adjustment airbag 8 are connected to the air source (air pump) of the car seat. The air source is used to inflate and deflate the Z-axis adjustment airbag 4 and the X-axis adjustment airbag 8 and drive the Z-axis adjustment airbag 4 and the X-axis adjustment airbag 8 to unfold or retract.

[0032] Furthermore, in this embodiment, the four Z-direction airbag guide rods 5 are vertically fixed to the bottom of the top fixing plate 2 and located around the Z-direction adjusting airbag 4. The outer wall of the Z-direction adjusting airbag 4 has four guide holes that fit onto the four Z-direction airbag guide rods 5. The extension and retraction of the Z-direction adjusting airbag 4 are guided by the Z-direction airbag guide rods 5, ensuring the stability of the headrest adjustment. The four X-direction airbag guide rods 9 are horizontally fixed to the headrest frame 3 and located around the X-direction adjusting airbag 8. The outer wall of the X-direction adjusting airbag 8 has four guide holes that fit onto the four X-direction airbag guide rods 9. The extension and retraction of the X-direction adjusting airbag 9 are guided by the X-direction airbag guide rods 8, ensuring the stability of the headrest adjustment.

[0033] Furthermore, the headrest housing connecting frame in this embodiment includes: four rectangular through holes 11 opened laterally on the headrest frame 3; X-direction adjusting guide rods 12 slidably connected in the four through holes 11; and guide rod bushings 13 fitted on the X-direction adjusting guide rods 12 and slidably connected in the through holes 11. The first ends of the four parallel X-direction adjusting guide rods 12 are fixed to the inner wall of the front headrest housing 7, and the tail ends of the four parallel X-direction adjusting guide rods 12 are fixed to the guide rod fixing frame 14. The guide rod fixing frame 14 is located on the side of the headrest frame 3 away from the front headrest housing 7. The front headrest housing 7 moves forward and backward along the X direction on the headrest frame 3 through the headrest housing connecting frame.

[0034] Furthermore, the inertia lock in this embodiment is used to buffer the headrest pressure in the X direction, preventing excessive impact force from damaging the X-direction adjustment mechanism when the passenger's head leans back against the headrest, thus reducing the whiplash effect and injury to the occupant. The inertia lock includes: two nuts 15 with bolt holes opened laterally on the headrest frame 3; a lead screw 16 threaded into the bolt holes of the nuts 15 and arranged in the X direction; a lead screw end self-rotating seat 17 fixed inside the headrest front housing 7; one end of the lead screw 16 extends into the lead screw end self-rotating seat 17 and is engaged in the lead screw end self-rotating seat 17 by a retaining ring 18 fixed to the lead screw end and can rotate within the lead screw end self-rotating seat.

[0035] Furthermore, in this embodiment, the front headrest shell 7 and the rear headrest shell 19 are fixedly connected to form the headrest shell.

[0036] Z-axis adjustment principle: When the headrest is adjusted downwards, the air pump built into the chair back inflates the Z-axis adjustment air bag 4 through the air tube. After inflation, the pleats of the air bag unfold, and under the guidance of the Z-axis air bag guide rod 5, it extends towards the top fixed plate 2. When it reaches the top fixed plate 2, the Z-axis adjustment air bag 4 continues to inflate. Under the counter-push force of the top fixed plate 2, the Z-axis adjustment air bag 4 pushes the headrest frame 3 downwards, realizing the downward adjustment of the headrest. When the headrest is adjusted upwards, the Z-axis adjustment air bag 4 is depressurized, and under the reset pull of the vertical coil spring 6, the upward adjustment is realized. During the above adjustment process, the headrest rod 1 is connected to the chair back frame through the headrest guide sleeve and the headrest rod guide sleeve mounting tube, so the position of the headrest rod is fixed.

[0037] X-direction adjustment principle: When the headrest is adjusted forward, the air pump built into the chair back inflates the X-direction adjustment air bag 8 through the air tube. After inflation, the X-direction adjustment air bag 8 is fixed to the headrest frame 3 by the rear end through the tape. Under the guidance of the X-direction air bag guide rod 9, the X-direction adjustment air bag 8 extends and opens in the horizontal direction. When it contacts the front shell 7 of the headrest, the X-direction adjustment air bag 8 continues to inflate and supports the front shell 7 of the headrest. The front shell 7 of the headrest drives the headrest shell connecting frame to move forward on the headrest frame 3. When the headrest is adjusted backward, the X-direction adjustment air bag 8 is depressurized, and the headrest is adjusted backward under the return tension of the transverse coil spring 10.

[0038] The adjustment principle of the inertia lock: When the passenger's head leans back against the headrest, it squeezes the front housing 7 of the headrest. During the backward movement of the front housing 7 of the headrest, the supporting screw 16 rotates in the nut 15, realizing the slow backward movement of the front housing 7 of the headrest. The presence of the self-rotating seat 17 at the end of the screw allows the screw 16 to rotate relative to the front housing 7 of the headrest.

[0039] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A pneumatic four-way headrest, comprising: A headrest rod mounted on a seat frame and a four-way headrest mounted on the headrest rod, characterized in that the four-way headrest is a pneumatic four-way headrest, the pneumatic four-way headrest comprising: a Z-axis lifting mechanism and an X-axis adjustment mechanism driven by a transverse air bag, wherein the Z-axis lifting mechanism is mounted on the headrest rod and drives the headrest housing to move up and down in the vertical direction, and the X-axis adjustment mechanism is mounted on the Z-axis lifting mechanism and drives the headrest housing to move in the front-back direction.

2. A pneumatic four-way headrest according to claim 1, characterized in that, The X-axis adjustment mechanism includes: an X-axis adjustment airbag fixed horizontally to the headrest frame and located between the headrest front shell and the headrest frame; an X-axis airbag guide rod for guiding the inflation and deflation of the X-axis adjustment airbag; a transverse coil spring for controlling the headrest front shell to drive in the opposite direction of the X-axis adjustment airbag; and a headrest shell connecting frame slidably connected to the headrest frame and fixedly connected to the headrest front shell in the X direction. The bottom coil spring bearing of the transverse coil spring is fixedly connected to the headrest frame, and the end of the coil spring band is fixedly connected to the headrest front shell. When the X-axis adjustment airbag is inflated and extends forward, it supports the headrest front shell and moves forward in the X direction. At the same time, the coil spring band of the transverse coil spring unfolds under the drive of the headrest front shell. When the headrest front shell is adjusted backward, the X-axis adjustment airbag deflates and releases pressure, and under the reset tension of the transverse coil spring, it drives the headrest front shell to move backward in the X direction.

3. A pneumatic four-way headrest according to claim 2, characterized in that, The headrest housing connecting frame includes: four rectangular through holes opened laterally on the headrest frame; X-axis adjusting guide rods slidably connected in the four through holes; and guide rod bushings fitted on the X-axis adjusting guide rods and slidably connected in the through holes. The first ends of the four parallel X-axis adjusting guide rods are fixed to the inner wall of the front headrest housing, and the tail ends of the four parallel X-axis adjusting guide rods are fixed to the guide rod fixing frame. The guide rod fixing frame is located on the side of the headrest frame away from the front headrest housing. The front headrest housing moves forward and backward along the X-axis on the headrest frame through the headrest housing connecting frame.

4. A pneumatic four-way headrest according to claim 2, characterized in that, The bottom of the X-direction adjustable airbag is attached to the side of the headrest frame and located near the front shell of the headrest. The X-direction adjustable airbag is connected to the air source of the car seat. The air source is used to inflate and deflate the X-direction adjustable airbag and drive it to expand or retract. The bottom spring bearings of the two transverse coil springs are respectively fixed to the two side walls of the headrest frame, and the spring ends of the two transverse coil springs are fixed to the inner wall of the front shell of the headrest.

5. A pneumatic four-way headrest according to claim 2, characterized in that, A set of X-direction airbag guide rods are horizontally fixed to the headrest frame and located around the X-direction adjustable airbag. The outer wall of the X-direction adjustable airbag is provided with guide holes that fit onto the X-direction airbag guide rods. The extension and retraction of the X-direction adjustable airbag is guided by the X-direction airbag guide rods.

6. A pneumatic four-way headrest according to claim 1, characterized in that, The Z-axis lifting mechanism includes: a top fixing plate fixed to the top of the two headrest rods; a headrest frame fitted onto the headrest rods and sliding on the headrest rods; a Z-axis adjusting air bag fixed to the headrest frame and located between the headrest frame and the top fixing plate; a Z-axis air bag guide rod for guiding the inflation and deflation of the Z-axis adjusting air bag; and a vertical coil spring for controlling the headrest frame to drive in the opposite direction of the Z-axis adjusting air bag. The bottom coil spring bearing of the vertical coil spring is fixed to the headrest frame, and the end of the coil spring band is fixed to the top fixing plate. When the Z-axis adjusting air bag is inflated and extends upward, it presses against the top fixing plate and drives the headrest frame to move downward on the headrest rods under the action of the counter-thrust. At the same time, the coil spring band of the vertical coil spring unfolds under the action of the headrest frame. When the headrest frame is adjusted upward, the Z-axis adjusting air bag deflates and releases pressure, driving the headrest frame to move upward under the return tension of the vertical coil spring.

7. A pneumatic four-way headrest according to claim 6, characterized in that, The headrest frame is a frame, and the bottom of the Z-axis adjustment air bag is glued and fixed to the upper surface of the headrest frame. The Z-axis adjustment air bag is connected to the air source of the car seat. The air source is used to inflate and deflate the Z-axis adjustment air bag and drive the Z-axis adjustment air bag to unfold or retract. The bottom spring bearings of the two vertical springs are respectively fixed to the two side walls of the headrest frame near the bottom. The spring ends of the two vertical springs are fixed to the two sides of the top fixing plate.

8. A pneumatic four-way headrest according to claim 6, characterized in that, A set of Z-direction airbag guide rods are vertically fixed to the bottom of the top fixing plate and located around the Z-direction adjusting airbag. The outer wall of the Z-direction adjusting airbag is provided with guide holes that fit onto the Z-direction airbag guide rods. The extension and retraction of the Z-direction adjusting airbag are guided by the Z-direction airbag guide rods.

9. A pneumatic four-way headrest according to claim 2, characterized in that, The front and rear shells of the headrest are fixedly connected to form the headrest shell.

10. A pneumatic four-way headrest according to claim 2, characterized in that, It also includes an inertia lock, which is used to buffer the headrest pressure in the X direction. The inertia lock includes: a bolt hole or nut with a bolt hole opened laterally on the headrest frame; a lead screw threaded into the bolt hole and arranged in the X direction; a lead screw end self-rotating seat fixed inside the front housing of the headrest; one end of the lead screw extends into the lead screw end self-rotating seat and is locked in the lead screw end self-rotating seat by a retaining ring fixed to the lead screw end and can rotate in the lead screw end self-rotating seat.

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