Vehicle seat headrest

Abstract

The utility model discloses a vehicle seat headrest relates to the field of car. The vehicle seat headrest includes: base, sliding part is used for connecting headrest front cover, and with base sliding cooperation, to form the sliding of headrest front cover in the first direction close or away from the base, locking piece, the locking piece is movably arranged on the base, and the locking piece has a plurality of locking parts, and a plurality of locking parts all cooperate with the sliding part to lock the sliding part, unlocking piece is transmission connection with the locking piece, and the unlocking piece is configured as force drives the locking piece movement to a plurality of locking parts and the sliding part disengages cooperation to remove the locking of sliding part. The utility model provides vehicle seat headrest has the characteristics that the assembly difficulty and manufacturing cost are lower, and the unlocking operation is more smooth and stable, can improve user experience significantly.

Description

Technical Field

[0001] This utility model relates to the automotive field, and more specifically, to a vehicle seat headrest. Background Technology

[0002] Currently, some vehicle headrests on the market have four-way adjustment capabilities, allowing for height and fore-aft adjustment. Some of these headrests are manually adjustable for fore-aft and are equipped with an unlockable locking mechanism to secure the headrest in its fore-aft position after adjustment.

[0003] To ensure reliable locking, such locking mechanisms typically consist of multiple independent locking components. However, this design results in a complex overall headrest structure with an excessive number of parts, increasing assembly difficulty and manufacturing costs. Furthermore, it can lead to inconsistent unlocking actions due to asynchronous movements of the locking components, affecting the smoothness of the unlocking process and the user experience. Utility Model Content

[0004] The purpose of this utility model is to provide a vehicle seat headrest that has the characteristics of lower assembly difficulty and manufacturing cost, and smoother and more stable unlocking operation, which can significantly improve the user experience.

[0005] The embodiments of this utility model provide a technical solution: A vehicle seat headrest, comprising: Base; A slider is used to connect the headrest front cover and slide in cooperation with the base to form a sliding motion of the headrest front cover toward or away from the base in a first direction; A locking member is movably disposed on the base, the locking member having multiple locking portions, each of the multiple locking portions cooperating with the sliding member to lock the sliding member; An unlocking component is connected to the locking component via a transmission mechanism. The unlocking component is configured to be forced to move the locking component until the multiple locking parts disengage from the sliding component, thereby releasing the locking of the sliding component.

[0006] In an optional embodiment, the unlocking member is slidably engaged with the base and can slide relative to the base in a second direction; the locking member is slidably engaged with the base and can slide relative to the base in a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0007] In an optional embodiment, the locking member includes a main body extending in the second direction, with two locking portions respectively disposed at both ends of the main body.

[0008] In an optional embodiment, the locking member further includes two mating parts, which are respectively disposed at both ends of the main body and located on one side of the two locking parts in the first direction; Both of the mating parts are provided with mating inclined surfaces, and the unlocking member is provided with two pushing inclined surfaces. The two pushing inclined surfaces are respectively attached to the two mating inclined surfaces. The unlocking member pushes against the mating inclined surfaces through the pushing inclined surfaces to drive the locking member to move.

[0009] In an optional embodiment, the main body is provided with a hanging part; The vehicle seat headrest also includes a first elastic member, one end of which is connected to the hanging part and the other end of which is connected to the base. The first elastic member is used to continuously apply an elastic force to the locking member to drive the plurality of locking parts to cooperate with the sliding member.

[0010] In an optional embodiment, one of the locking part and the base is provided with a groove extending upward from the third part, and the other part is provided with a protrusion that extends into the groove and slides in cooperation with the groove.

[0011] In an optional embodiment, the vehicle seat headrest further includes a second elastic member, the two ends of which abut against the unlocking member and the base respectively to provide a restoring force for the unlocking member.

[0012] In an optional embodiment, the base is provided with a mounting beam extending in the second direction, the sliding member passes through the base via the mounting beam on one side in the third direction, and the locking member is located on the other side of the mounting beam in the third direction. The mounting beam is provided with a plurality of clearance holes corresponding to the plurality of locking parts. Each locking part passes through a corresponding clearance hole so that the locking part can cooperate with the sliding part.

[0013] In an optional embodiment, the vehicle seat headrest further includes a headrest insert and a lifting motor. The base is sleeved on the headrest insert, and the lifting motor is located on the side of the mounting beam where the locking member is located. The lifting motor is tractively connected to the headrest insert and is used to drive the base to move along the headrest insert in the third direction.

[0014] In an optional embodiment, the unlocking member is provided with a limiting spring buckle, and the surface of the mounting beam is recessed with a limiting groove. The limiting spring buckle is inserted into the limiting groove, and the mechanism is configured such that when the unlocking member is subjected to force and moves along the second direction until the locking part disengages from the sliding member, the limiting spring buckle moves in the limiting groove; and when the unlocking member is restored by the action of the second elastic member, the limiting spring buckle is restricted from disengaging from the limiting groove.

[0015] In an optional embodiment, the slider has a plurality of locking slot queues corresponding to the plurality of locking portions, and any locking slot queue includes a plurality of locking slots arranged sequentially in the first direction; Each of the locking parts is inserted along the third direction into one of the plurality of locking slots in the corresponding locking slot queue.

[0016] In an optional embodiment, the base also has two guide grooves spaced apart in the first direction, and the unlocking member is slidably disposed in the guide grooves. Each guide groove includes two limiting flanges spaced apart in the third direction and extending along the second direction.

[0017] In an optional embodiment, the vehicle seat headrest further includes a headrest rear cover connected to the headrest front cover, and a button assembly disposed on the headrest rear cover, wherein the unlocking member abuts against the button assembly.

[0018] Compared to existing technologies, the vehicle seat headrest provided by this utility model features a sliding member that can slide relative to the base in a first direction, namely the front-to-back direction. This allows the headrest cover to slide closer to or further away from the base in the front-to-back direction, thus adjusting the headrest's position. The locking member has multiple locking parts, all of which cooperate with the sliding member to reliably lock it. Furthermore, the integration of these locking parts onto the locking member simplifies the overall structure and reduces the number of parts. Under the action of the unlocking member, the locking member can drive the multiple locking parts to move synchronously, disengaging the sliding member and ensuring consistent unlocking action. Therefore, the vehicle seat headrest provided by this utility model offers the following advantages: lower assembly difficulty and manufacturing cost, smoother and more stable unlocking operation, and a significantly improved user experience. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and therefore should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 A schematic diagram of the structure of a vehicle seat headrest provided for an embodiment of this utility model; Figure 2 An exploded view of a vehicle seat headrest provided for an embodiment of this utility model; Figure 3 A schematic diagram of the connection structure of the base, sliding member, locking member, unlocking member and headrest insert from one perspective; Figure 4 A schematic diagram of the connection structure of the base, sliding member, locking member and unlocking member from one perspective; Figure 5 A schematic diagram of the connection structure of the base, sliding member, locking member and unlocking member from another perspective; Figure 6 An exploded schematic diagram of the connection structure of the base, sliding member, locking member and unlocking member; Figure 7 Another exploded view of the connection structure of the base, sliding member, locking member and unlocking member; Figure 8 This is another exploded diagram of the connection structure of the base, sliding member, locking member and unlocking member; Figure 9 This is a schematic diagram of the locking mechanism. Figure 10 for Figure 7 Enlarged view of region A in the middle; Figure 11 This is a structural diagram of the unlocking component; Figure 12 for Figure 7 Enlarged view of region B in the middle; Figure 13 A schematic diagram of the connection structure of the base, sliding parts, locking parts, unlocking parts and headrest insert rod from another perspective; Figure 14 for Figure 13 Sectional view of AA; Figure 15 This is a schematic diagram of the connection structure of the button assembly, base, slider, locking component, and unlocking component in the locked state; Figure 16 This is a schematic diagram of the connection structure of the sliding component, locking component, and unlocking component in the locked state; Figure 17 This is a cross-sectional view of the connection structure between the sliding member and the locking member in the locked state. Figure 18 A cross-sectional view of the connection structure between the locking and unlocking components in the locked state; Figure 19 This is a schematic diagram of the connection structure of the button assembly, base, slider, locking component, and unlocking component in the unlocked state. Figure 20 This is a schematic diagram of the connection structure of the slider, locking component, and unlocking component in the unlocked state. Figure 21 This is a cross-sectional view of the connection structure between the slider and the locking element in the unlocked state. Figure 22 A cross-sectional view of the connection structure between the locking and unlocking components in the unlocked state; Figure 23 To complete the sectional view of the connection structure between the sliding part and the locking part when the vehicle seat headrest is adjusted backward; Figure 24 A cross-sectional view of the connection structure between the sliding member and the locking member when the vehicle seat headrest is adjusted backward; Figure 25 This is a schematic diagram of the connection structure between the two preload springs and the base; Figure 26 for Figure 25 An exploded view of the structure shown; Figure 27 This is a schematic diagram of the connection structure between the slider and the base in another embodiment; Figure 28 for Figure 27 The diagram shown in the embodiment illustrates the connection structure between the slider and the headrest front cover. Figure 29 This is a schematic diagram of the connection structure between the lifting motor and the base; Figure 30 This is a cross-sectional view of the connection structure between the lifting motor and the base; Figure 31 A cross-sectional view of the connection structure of the lifting motor, locking components, base, and sliding components; Figure 32 A schematic diagram of the connection structure of the headrest insert, fixing components, base, and lifting motor; Figure 33 An exploded view of the connection structure of the headrest insert, fixing components, base, and lifting motor; Figure 34 A schematic diagram of the connection structure between the base and the headrest insert when the vehicle seat headrest is in its lower limit position; Figure 35 for Figure 34 A cross-sectional view of the structure shown; Figure 36 A schematic diagram of the connection structure between the base and the headrest insert when the vehicle seat headrest is in its upper limit position; Figure 37 for Figure 36 A cross-sectional view of the structure shown; Figure 38 This is a schematic diagram of the connection structure between the lifting motor and the base in another embodiment; Figure 39 for Figure 38 A schematic diagram of the connection structure of the lifting motor, base and sliding component in the embodiment shown; Figure 40 for Figure 38 An exploded view of the connection structure between the lifting motor and the base in the illustrated embodiment; Figure 41 for Figure 38 The schematic diagram of the locking member and the sliding member in the embodiment shown is as follows; Figure 42 This is a schematic diagram of the connection structure between the fastener and the nut in one state in this embodiment; Figure 43 This is a schematic diagram of the connection structure between the fastener and the nut in another state. Figure 44 for Figure 42 An exploded view of the structure shown.

[0021] Icons: 10-Vehicle seat headrest; 11-Base; 111-Protrusion; 112-Mounting beam; 1121-Connecting part; 113-Leaving hole; 114-Limiting flange; 115-Limiting groove; 116-Guide column; 117-Positioning protrusion; 118-Slide rail; 119-Upper slide rail; 12-Sliding part; 121-Lock groove array; 122-Lock groove; 13-Headrest front cover; 14-Locking part; 141-Locking part; 142-Main body; 143-Slide rail; 144-Mating part; 145-Mating slope; 146-Hanging part; 15-Unlocking part; 151-Pushing slope; 152-Limiting spring buckle; 1 521-Guide slope; 1522-Stop surface; 153-Pressure bearing part; 154-Unlocking part; 1541-Leaning groove; 1542-Limiting protrusion; 155-Guide hole; 156-Positioning hole; 157-Limiting part; 16-First elastic element; 17-Headrest insert rod; 18-Lifting motor; 181-Lead screw; 19-Second elastic element; 20-Headrest back cover; 21-Button assembly; 22-Upper slide rail; 23-Preload spring; 24-Fixing element; 241-Nut; 242-Positioning groove; 243-Matching groove; 244-Mounting hole; 245-Anti-disengagement groove; 246-Elastic hook; 25-Motor shock absorber. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0029] Example Please refer to the following: Figure 1 and Figure 2 , Figure 1 The diagram shown is a structural schematic of the vehicle seat headrest 10 provided in this embodiment. Figure 2 The diagram shown is an exploded view of the vehicle seat headrest 10.

[0030] The vehicle seat headrest 10 provided in this embodiment is applied to an automobile seat and specifically includes a base 11, a slider 12, a headrest front cover 13, a locking member 14, an unlocking member 15, a headrest rear cover 20, a button assembly 21, a headrest insert 17, and a lifting motor 18. The headrest front cover 13 and the headrest rear cover 20 are connected and closed to form an accommodating space, and the base 11, slider 12, locking member 14, unlocking member 15, and lifting motor 18 are all disposed within the accommodating space. One end of the headrest insert 17 extends into the accommodating space, and the other end is used to connect to the backrest of the automobile seat.

[0031] Please refer to the following: Figure 3 , Figure 3 The diagram shown is a schematic diagram of the connection structure of the base 11, the sliding member 12, the locking member 14, the unlocking member 15 and the headrest insert 17 from one perspective.

[0032] The sliding member 12 is slidably disposed on the base 11 and connected to the headrest front cover 13, so as to allow the headrest front cover 13 to slide closer to or further away from the base 11 in a first direction. The first direction is actually the front-back direction, which allows for manual adjustment of the front-back position of the vehicle seat headrest 10 under the action of external force. The base 11 is slidably sleeved on the insert rod, and the lifting motor 18 is disposed on the base 11 and drivenly connected to the headrest insert rod 17, which can drive the base 11 to move along the headrest insert rod 17 in a third direction, which is actually the up-down direction, thus enabling automatic adjustment of the height position of the vehicle seat headrest 10.

[0033] The locking member 14 is movably disposed on the base 11 and has multiple locking portions 141, each of which cooperates with the sliding member 12 to lock the sliding member 12. The button assembly 21 is mounted on the headrest back cover 20 and is connected to the locking member 14 via the unlocking member 15. When the button assembly 21 is pressed, the unlocking member 15 drives the locking member 14 to move until the multiple locking portions 141 disengage from the sliding member 12, thereby releasing the locking of the sliding member 12.

[0034] In this embodiment, when the multiple locking parts 141 cooperate with the sliding member 12, the sliding member 12 can still slide forward relative to the base 11 under force, while the backward sliding of the sliding member 12 relative to the base 11 is locked. In other words, when the sliding member 12 is locked, the vehicle seat headrest 10 can still be adjusted forward, but cannot be adjusted backward. This achieves quick forward adjustment of the vehicle seat headrest 10 without unlocking, and prevents the headrest cover 13 from shifting backward due to impact with the occupant's head during driving.

[0035] Please refer to the following: Figure 4 and Figure 5 , Figure 4The diagram shown is a schematic representation of the connection structure of the base 11, sliding member 12, locking member 14, and unlocking member 15 from one perspective. Figure 5 The diagram shown is a schematic diagram of the connection structure of the base 11, the slider 12, the locking member 14 and the unlocking member 15 from another perspective.

[0036] Figure 4 The X arrow points to the first direction, i.e., the front-to-back direction; the Y arrow points to the second direction, i.e., the left-to-right direction; and the Z arrow points to the third direction, i.e., the up-to-down direction.

[0037] In this embodiment, both the locking member 14 and the unlocking member 15 are slidably engaged with the base 11. The unlocking member 15 can slide relative to the base 11 in a second direction under the action of the button assembly 21, thereby causing the locking member 14 to slide upward in a third direction, thereby unlocking the sliding member 12. In fact, the second direction is the left and right direction.

[0038] The vehicle seat headrest 10 also includes a first elastic member 16, which is disposed between the locking member 14 and the base 11. The first elastic member 16 is used to continuously apply an elastic force to the locking member 14 so that when the force of the unlocking member 15 is removed, the locking member 14 returns to its original position and slides upward to cooperate with the multiple locking parts 141 and the sliding member 12, thereby realizing automatic locking of the sliding member 12 after the front and rear position adjustment is completed.

[0039] Please refer to the following: Figure 6 , Figure 7 and Figure 8 , Figure 6 The diagram shown is an exploded view of the connection structure of the base 11, the sliding member 12, the locking member 14, and the unlocking member 15. Figure 7 The diagram shown is another exploded view of the connection structure of the base 11, the slider 12, the locking member 14, and the unlocking member 15. Figure 8 The diagram shown is another exploded view of the connection structure of the base 11, the sliding member 12, the locking member 14 and the unlocking member 15.

[0040] In this embodiment, a mounting beam 112 extending in the second direction is provided on the base 11, and the sliding member 12 passes through the base 11 through the mounting beam 112 on the third-direction side. The locking member 14 and the unlocking member 15 are located on the other side of the mounting beam 112 in the third-direction direction.

[0041] like Figure 7 As shown, in this embodiment, the base 11 has a slide rail 118 extending in a first direction extending through it below the mounting beam 112. The sliding member 12 passes through the slide rail 118 and slides in cooperation with it. The locking member 14 and the unlocking member 15 are both located above the mounting beam 112.

[0042] In fact, the base 11 has a clearance space above the mounting beam 112 for the locking member 14 to slide up and down, and the locking member 14 is located within this clearance space. The vehicle seat headrest 10 also includes a second elastic member 19, which is disposed between the unlocking member 15 and the base 11, and is used to continuously apply an elastic force to the unlocking member 15 so that the unlocking member 15 returns to its original position and slides in a second direction when the force of the button assembly 21 is removed.

[0043] Please refer to the following: Figure 9 and Figure 10 , Figure 9 The diagram shown is a structural schematic of the locking element 14. Figure 10 As shown Figure 7 An enlarged schematic diagram of region A in the middle.

[0044] In this embodiment, the locking member 14 includes a main body 142 extending in the second direction, and two locking parts 141 are respectively disposed at both ends of the main body 142. The mounting beam 112 is provided with two clearance holes 113 corresponding to the two locking parts 141. The two locking parts 141 pass through the two clearance holes 113 respectively and cooperate with the sliding member 12 located below the mounting beam 112 to lock the sliding member 12.

[0045] The slider 12 has two locking slot queues 121 spaced apart in a second direction, each locking slot queue 121 including a plurality of locking slots 122 arranged sequentially in a first direction. Two locking parts 141 correspond one-to-one with the two locking slot queues 121 in a third direction, and each locking part 141 is inserted into one of the plurality of locking slots 122 in the corresponding locking slot queue 121 along the third direction.

[0046] Regarding the sliding engagement between the locking member 14 and the base 11 in the third direction, in this embodiment, the two locking parts 141 are provided with sliding grooves 143 on both sides that are opposite to each other in the second direction. The sliding grooves 143 extend in the third direction. The base 11 is provided with two protrusions 111 that are opposite to each other in the second direction. The two protrusions 111 extend into the two sliding grooves 143 respectively and slide in engagement with the sliding grooves 143.

[0047] In fact, the two protrusions 111 are respectively protruding on the two side walls of the clearance space in the second direction. Through the sliding cooperation of the two protrusions 111 and the two slide grooves 143, the locking member 14 is guided to slide in the third direction, and the movement of the locking member 14 relative to the base 11 in the first and second directions is restricted, so as to prevent the locking member 14 from getting stuck in the third direction and ensure that the unlocking and locking process is smooth.

[0048] In another embodiment, the locking member 14 and the base 11 may be fitted together in a sliding engagement in the third direction using other structures. For example, a groove 143 may be provided on the base 11, and a protrusion 111 may be provided on the main body 142 or the locking member 141.

[0049] Please refer to the following: Figure 11 and Figure 12 , Figure 11 The diagram shown is a structural schematic of the unlocking component 15. Figure 12 As shown Figure 7 Enlarged schematic diagram of region B in the middle.

[0050] The locking member 14 also includes two mating parts 144, which are respectively disposed at both ends of the main body 142 and on one side of the two locking parts 141 in the first direction. Each of the two mating parts 144 is provided with a mating inclined surface 145. The unlocking member 15 is provided with two pushing inclined surfaces 151, which are respectively engaged with the two mating inclined surfaces 145. The unlocking member 15 pushes the mating inclined surfaces 145 through the pushing inclined surfaces 151 to drive the locking member 14 to move.

[0051] Understandably, both the mating ramp 145 and the pushing ramp 151 are inclined relative to the second and third directions. During the unlocking process, the button assembly 21 pushes the unlocking member 15 to slide from left to right on the mounting beam 112. The two pushing ramps 151 on the unlocking member 15 push against their respective mating ramps 145, thereby pushing the locking member 14 to slide from bottom to top, causing the two locking parts 141 to disengage from their respective locking grooves 122, thus unlocking the sliding member 12.

[0052] It should be noted that in this embodiment, the two mating parts 144 are provided at both ends of the main body 142, corresponding to the two locking parts 141. This can improve the consistency of the actions of the two locking parts 141 during the unlocking process, ensure that the two locking parts 141 exit their respective lock slots 122 synchronously, and ensure that the unlocking operation is smooth and stable.

[0053] Please refer to the following: Figure 13 and Figure 14 , Figure 13 The diagram shown is a schematic representation of the connection structure of the base 11, sliding member 12, locking member 14, unlocking member 15, and headrest insert 17 from another perspective. Figure 14 As shown Figure 13 Sectional view of AA.

[0054] The main body 142 is provided with a hanging part 146 at the middle position in the second direction, and the mounting beam 112 of the base 11 is provided with a connecting part 1121. In this embodiment, the first elastic element 16 is a tension spring, one end of which is hung and connected to the hanging part 146, and the other end is hung and connected to the connecting part 1121.

[0055] During the unlocking process, the locking member 14 slides upward relative to the mounting beam 112, and the first elastic member 16 is stretched more, gradually accumulating its elastic potential energy. When the pressing force applied to the button assembly 21 is removed, the first elastic member 16 releases its elastic potential energy, pulling the locking member 14 downward until the two locking parts 141 are inserted back into the corresponding locking grooves 122.

[0056] It should be noted that in this embodiment, the hanging part 146 is located at the middle position of the main body part 142 in the second direction, which ensures that the two locking parts 141 at both ends of the main body part 142 are subjected to equal force, thereby ensuring that the two locking parts 141 can move downward synchronously during the process of relocking the sliding member 12, and preventing jamming due to inconsistent movement of the two locking parts 141.

[0057] The unlocking component 15 includes a pressure-bearing part 153 and an unlocking part 154. The pressure-bearing part 153 is located on one side of the base 11 in the second direction, and the unlocking part 154 is located on one side of the base 11 in the first direction. Two abutting inclined surfaces 151 are spaced apart on the unlocking part 154. One end of the pressure-bearing part 153 is connected to the unlocking part 154 and abuts against the button assembly 21, so as to drive the unlocking part 154 to move from left to right under the pushing action of the button assembly 21.

[0058] To limit the unlocking member 15 in the first direction and the third direction, in this embodiment, the base 11 also has two guide grooves spaced apart in the first direction. The unlocking member 15 is slidably disposed in the guide grooves. Each guide groove includes two limiting flanges 114 spaced apart in the third direction and extending along the second direction. In other words, at least two limiting flanges 114 are spaced apart in the third direction to form guide grooves extending in the second direction, and the unlocking part 154 is slidably disposed in the guide grooves. Specifically, the unlocking part 154 has limiting protrusions 1542 on both opposite sides in the third direction. The limiting protrusions 1542 on both sides slide and cooperate with the corresponding limiting flanges 114 to reliably limit the unlocking member 15.

[0059] Furthermore, the unlocking component 15 also includes a limiting part 157, which is located on the side of the base 11 facing away from the unlocking part 154 in a first direction, and the limiting part 157 is connected to the end of the pressure-bearing part 153 away from the unlocking part 154. The front surface of the base 11 is also provided with at least two limiting flanges 114 spaced apart in a third direction, and the limiting part 157 is also slidably disposed in the guide groove formed by the two limiting flanges 114.

[0060] In order to limit the sliding stroke of the unlocking member 15 in the second direction, in this embodiment, the unlocking member 15 is provided with a limiting spring buckle 152, and the surface of the mounting beam 112 is recessed with a limiting groove 115. The limiting spring buckle 152 is inserted into the limiting groove 115, and the mechanism is configured such that when the unlocking member 15 is subjected to force and moves along the second direction to the process of the locking part 141 disengaging from the sliding member 12, the limiting spring buckle 152 moves in the limiting groove 115; and when the unlocking member 15 is restored by the action of the second elastic member 19, the limiting spring buckle 152 is restricted from disengaging from the limiting groove 115.

[0061] like Figure 12 As shown, the limiting spring 152 is a cantilever structure with elastic deformation capability. A clearance groove 1541 is formed on the bottom surface of the unlocking part 154. One end of the limiting spring 152 is connected to the right side wall of the clearance groove 1541, while the other end is suspended and protrudes from the opening of the clearance groove 1541. When the suspended end of the limiting spring 152 is subjected to an upward force, the limiting spring 152 can bend upward, thereby retracting into the clearance groove 1541.

[0062] In this embodiment, to facilitate the assembly of the unlocking component 15, the right side surface of the suspended end of the limiting spring buckle 152 is provided with a guide slope 1521 inclined relative to the second direction, while the left side surface of the suspended end is provided with a stop surface 1522 approximately perpendicular to the second direction. During the actual assembly process, the unlocking part 154 extends into the guide groove from left to right and gradually slides to the right along the guide groove. During this process, when the guide slope 1521 on the limiting spring buckle 152 contacts the mounting beam 112, it causes the limiting spring buckle 152 to bend upward until the suspended end retracts into the interior of the relief groove 1541.

[0063] When the unlocking part 154 slides to the right along the guide groove until the limiting spring 152 reaches the position of the limiting groove 115, the limiting spring 152 releases its elastic potential energy and extends into the limiting groove 115, thus completing the assembly of the unlocking part 15. In this state, the left side wall of the limiting groove 115 is opposite to the stop surface 1522 of the limiting spring 152, while the left side wall of the base 11 forms a stop on the right side of the pressure bearing part 153. The combination of the two restricts the movement stroke of the unlocking part 15 in the second direction.

[0064] In this embodiment, a guide post 116 extending in the second direction is protruding from the side wall of the base 11 opposite to the pressure-bearing part 153. A guide hole 155 is provided through the pressure-bearing part 153, and the guide post 116 passes through the guide hole 155 and slides in cooperation with the guide hole 155. The second elastic member 19 is actually a compression spring, sleeved on the guide post 116, and the two ends of the second elastic member 19 respectively abut against the pressure-bearing part 153 and the base 11.

[0065] Furthermore, in order to further improve the stability of the unlocking component 15 moving in the second direction, in this embodiment, a positioning protrusion 117 is also provided on the side wall opposite to the pressure bearing part 153 of the base 11, and a positioning hole 156 is provided through the pressure bearing part 153. The positioning protrusion 117 passes through the positioning hole 156 and slides in cooperation with the positioning hole 156.

[0066] Please refer to the following: Figures 15 to 18 , Figure 15 The diagram shows the connection structure of the button assembly 21, base 11, slider 12, locking member 14, and unlocking member 15 in the locked state. Figure 16 The diagram shows the connection structure of the sliding member 12, the locking member 14, and the unlocking member 15 in the locked state. Figure 17 The figure shown is a cross-sectional view of the connection structure between the sliding member 12 and the locking member 14 in the locked state. Figure 18 The figure shown is a cross-sectional view of the connection structure between the locking member 14 and the unlocking member 15 in the locked state.

[0067] In the locked state, the locking member 14 is in the lower limit position, and the two locking parts 141 on the locking member 14 pass through the clearance holes 113 on the mounting beam 112 and are inserted into the corresponding lock slots 122 in the lock slot queue 121. The unlocking member 15 is in the left limit position, and the left side wall of the limiting groove 115 contacts the stop surface 1522 of the limiting spring buckle 152. The two pushing slopes 151 on the unlocking part 154 are respectively engaged with the mating slopes 145 on the two locking parts 141.

[0068] In this embodiment, both the locking groove 122 and the locking part 141 are wedge-shaped. When the locking part 141 is inserted into the locking groove 122, it forms a stop against the front wall of the locking groove 122, thereby restricting the sliding member 12 from sliding backward and thus restricting the rearward adjustment of the vehicle seat headrest 10. When the sliding member 12 slides forward, the locking part 141 can smoothly exit the locking groove 122, ensuring that the vehicle seat headrest 10 can still be adjusted forward in the locked state.

[0069] Please refer to the following: Figures 19 to 22 , Figure 19 The diagram shows the connection structure of the button assembly 21, base 11, slider 12, locking component 14, and unlocking component 15 in the unlocked state. Figure 20 The diagram shows the connection structure of the slider 12, locking member 14, and unlocking member 15 in the unlocked state. Figure 21 The figure shown is a cross-sectional view of the connection structure between the slider 12 and the locking member 14 in the unlocked state. Figure 22 The figure shown is a cross-sectional view of the connection structure between the locking member 14 and the unlocking member 15 in the unlocked state.

[0070] When it is necessary to unlock the slider 12, a pressing force is applied to the button assembly 21, causing the button assembly 21 to push the locking member 14 to slide from left to right. The second elastic member 19, located between the pressure-bearing part 153 and the base 11, is compressed and accumulates elastic potential energy. During this process, the two pushing ramps 151 on the unlocking part 154 slide from left to right relative to the mating ramps 145 on the two locking parts 141, thereby pushing the locking member 14 to slide vertically upward until the two locking parts 141 disengage from the corresponding locking grooves 122, thereby unlocking the slider 12. The first elastic member 16 between the locking member 14 and the base 11 is stretched and accumulates elastic potential energy.

[0071] Please refer to the following: Figure 23 , Figure 23 The diagram shows a cross-sectional view of the connection structure between the sliding member 12 and the locking member 14 when the vehicle seat headrest 10 is adjusted backward.

[0072] After the two locking parts 141 disengage from their corresponding locking slots 122, the locking member 14 releases its lock on the sliding member 12. In this state, a force can be applied to the headrest front cover 13, causing the sliding member 12 to slide relative to the base 11 from front to back, so that the headrest front cover 13 gradually moves closer to the base 11. After adjustment, the locking slot 122 further forward in the locking slot queue 121 is aligned with the locking part 141 in the third direction, achieving the desired alignment. Figure 23 The state shown.

[0073] Please refer to the following: Figure 24 , Figure 24 The diagram shows a cross-sectional view of the connection structure between the sliding member 12 and the locking member 14 after the vehicle seat headrest 10 has been adjusted backward.

[0074] After the rearward adjustment of the vehicle seat headrest 10 is completed, the pressing force applied to the button assembly 21 is released, and the first elastic member 16 and the second elastic member 19 release elastic potential energy. The first elastic member 16 pulls the locking member 14 to slide from top to bottom until the two locking parts 141 are respectively inserted into the two currently aligned locking grooves 122. The second elastic member 19 pushes the unlocking member 15 to slide from right to left until the stop surface 1522 of the limiting spring buckle 152 contacts the left side wall of the limiting groove 115 again, thus completing the re-locking of the sliding member 12.

[0075] To ensure the stability of the fore-and-aft position adjustment of the vehicle seat headrest 10, the vehicle seat headrest 10 provided in this embodiment also includes two upper slide rails 22, which are also in sliding engagement with the base 11 in the first direction.

[0076] In this embodiment, preferably in the left and right directions, both upper slide rails 22 are located on the side of the mounting beam 112 away from the sliding member 12 in the third direction. Furthermore, in the second direction, the mounting member is approximately positioned between the two upper slide rails 22.

[0077] Specifically, the base 11 has upper sliding grooves 119 on both opposite sides in the second direction, and the two upper sliding rails 22 are slidably engaged with the two upper sliding grooves 119 respectively. In order to ensure that the upper sliding rails 22 can slide smoothly along the upper sliding grooves 119 in the first direction and avoid shaking and jamming, the vehicle seat headrest 10 provided in this embodiment also includes two pre-tensioning springs 23, which are respectively disposed in the two upper sliding grooves 119.

[0078] Please refer to the following: Figure 25 and Figure 26 , Figure 25 The diagram shows the connection structure between the two preloaded springs 23 and the base 11. Figure 26 As shown Figure 25 An exploded view of the structure shown.

[0079] In this embodiment, two pre-tightening springs 23 are respectively disposed on the lower side wall of the two upper sliding grooves 119. When the assembly is completed, the two pre-tightening springs 23 continuously apply an upward elastic force to the corresponding upper slide rail 22 to eliminate the gap between the upper slide rail 22 and the corresponding upper sliding groove 119 in the vertical direction, so as to ensure that the upper slide rail 22 can slide smoothly and steadily in the upper sliding groove 119.

[0080] In this embodiment, the slider 12 has two cantilevered lower rails, which are spaced apart in the second direction and pass through two slide rails 118 provided on the base 11. The two lower rails correspond to the two locking parts 141 of the locking member 14, that is, the two locking grooves 121 are respectively provided on the upper surface of the two lower rails.

[0081] Please refer to the following: Figure 27 and Figure 28 , Figure 27 The diagram shown is a schematic representation of the connection structure between the slider 12 and the base 11 in another embodiment. Figure 28 The diagram shown is a schematic diagram of the connection structure between the slider 12 and the headrest front cover 13 in this embodiment.

[0082] In this embodiment, the slider 12 has only one lower slide rail, which cooperates with a slide rail 118 provided on the base 11. Two locking slots 121 are both provided on the upper surface of the lower slide rail, and the two locking slots 121 are arranged at intervals in the second direction, corresponding to the two locking parts 141 of the locking member 14 respectively.

[0083] It is understandable that in this embodiment, since the slider 12 slides with the base 11 through only one lower rail, the overall structure of the vehicle seat headrest 10 is simplified and the assembly difficulty is lower.

[0084] Please refer to the following: Figure 29 , Figure 30 and Figure 31 , Figure 29 The diagram shows the connection structure between the lifting motor 18 and the base 11. Figure 30 The figure shown is a cross-sectional view of the connection structure between the lifting motor 18 and the base 11. Figure 31 The figure shown is a cross-sectional view of the connection structure of the lifting motor 18, locking member 14, base 11 and sliding member 12.

[0085] The lifting motor 18 is located on the side of the mounting beam 112 where the locking member 14 is located, that is, above the mounting beam 112. The vehicle seat headrest 10 provided in this embodiment also includes a fixing member 24, which is located at the top of the headrest insert 17. The output end of the lifting motor 18 is connected to the fixing member 24. During operation, the lifting motor 18 drives the base 11 to move along the headrest insert 17 closer to or away from the fixing member 24, thereby adjusting the height of the vehicle seat headrest 10.

[0086] Please refer to the following: Figure 32 and Figure 33 , Figure 32 The diagram shows the connection structure of the headrest insert 17, the fixing component 24, the base 11, and the lifting motor 18. Figure 33 The diagram shown is an exploded view of the connection structure of the headrest insert 17, the fixing member 24, the base 11 and the lifting motor 18.

[0087] In this embodiment, the output end of the lifting motor 18 is provided with a lead screw 181 extending upward in a third direction, and a nut 241 is provided on the fixing member 24, with the lead screw 181 and the nut 241 threadedly engaged. In practical applications, the lifting motor 18 drives the lead screw 181 to rotate. Since the nut 241 is fixed on the fixing member 24, the rotation of the lead screw 181 causes the base 11 to rise or fall in a third direction, thereby adjusting the height of the vehicle seat headrest 10.

[0088] The vehicle seat headrest 10 provided in this embodiment also includes a motor damping pad 25. The motor damping pad 25 is disposed between the lifting motor 18 and the mounting beam 112, which serves to isolate vibration transmission, prevent the vibration of the lifting motor 18 from being transmitted to the base 11 during operation, and reduce noise.

[0089] It should be noted that, since the lifting motor 18 is located on the side of the mounting beam 112 where the locking part 14 is located, that is, on the side of the mounting beam 112 away from the sliding part 12, and the fixing part 24 and the nut 241 are located at the top of the headrest insert 17, the length of the lead screw 181 can be effectively reduced, avoiding the wobbling during the rotation process caused by the excessive length of the lead screw 181, thereby ensuring the stability of the height adjustment process of the vehicle seat headrest 10.

[0090] Please refer to the following: Figure 34 and Figure 35 , Figure 34 This is a schematic diagram of the connection structure between the base 11 and the headrest insert 17 when the vehicle seat headrest 10 is in its lower limit position. Figure 35 As shown Figure 34 A cross-sectional view of the structure shown. Figure 34 In the state shown, the base 11 is in the lower limit position, at which point the distance between the nut 241 and the lifting motor 18 in the third direction is the maximum.

[0091] Please refer to the following: Figure 36 and Figure 37 , Figure 36 This is a schematic diagram of the connection structure between the base 11 and the headrest insert 17 when the vehicle seat headrest 10 is in its upper limit position. Figure 37 As shown Figure 36 A cross-sectional view of the structure shown. Figure 36 In the state shown, the base 11 is in the upper limit position, at which point the distance between the nut 241 and the lifting motor 18 in the third direction is the minimum.

[0092] Please refer to the following: Figures 38 to 40 , Figure 38 The diagram shown is a schematic representation of the connection structure between the lifting motor 18 and the base 11 in another embodiment. Figure 39 The diagram shown is a schematic representation of the connection structure of the lifting motor 18, the base 11, and the sliding member 12 in this embodiment. Figure 40 The diagram shown is an exploded view of the connection structure between the lifting motor 18 and the base 11 in this embodiment.

[0093] In this embodiment, the sliding member 12 is positioned above the mounting beam 112, while the locking member 14 and the lifting motor 18 are both located below the mounting beam 112. In this case, the fixing member 24 can be positioned below the lifting motor 18, such that the lead screw 181 extends vertically downward from the lifting motor 18 to engage with the nut 241 on the fixing member 24.

[0094] It is understandable that although the lifting motor 18 is located below the mounting beam 112 in this embodiment, the length of the lead screw 181 can also be effectively reduced because the fixing member 24 and the nut 241 are both located below the lifting motor 18, thus ensuring the stability of the height adjustment process of the vehicle seat headrest 10.

[0095] Please refer to the following: Figure 41 , Figure 41 The image shown is in Figure 38 The schematic diagram of the locking member 14 and the sliding member 12 in the embodiment shown is shown.

[0096] In this embodiment, the sliding member 12 is positioned above the mounting beam 112, and the locking member 14 and the lifting motor 18 are positioned below the mounting beam 112. During the unlocking process, a pressing force is applied to the button assembly 21, causing the button assembly 21 to push the locking member 14 to slide from left to right. The two pushing ramps 151 on the unlocking part 154 slide from left to right relative to the mating ramps 145 on the two locking parts 141, thereby pushing the locking member 14 to slide vertically downward until the two locking parts 141 disengage from the corresponding locking grooves 122, thus unlocking the sliding member 12. The first elastic member 16 between the locking member 14 and the base 11 is stretched and accumulates elastic potential energy.

[0097] When the pressing force applied to the button assembly 21 is removed, the first elastic element 16 releases its elastic potential energy, pulling the locking element 14 to slide from bottom to top until the two locking parts 141 are respectively inserted into the two currently aligned locking grooves 122, thus completing the re-locking of the sliding element 12.

[0098] Please refer to the following: Figure 42 , Figure 43 and Figure 44 , Figure 42 The diagram shown is a schematic representation of the connection structure between the fastener 24 and the nut 241 in one state in this embodiment. Figure 43 The diagram shown is a schematic representation of the connection structure between the fastener 24 and the nut 241 in another configuration. Figure 44 As shown Figure 42 An exploded view of the structure shown.

[0099] In this embodiment, for ease of assembly, the nut 241 is installed on the fixing member 24 by a snap-fit ​​method, allowing for repeated assembly and disassembly. Specifically, the fixing member 24 has a positioning groove 242, and the outer side wall of the nut 241 is provided with a mating groove 243. The two opposite side walls of the positioning groove 242 are embedded in the mating groove 243 to achieve positioning of the nut 241 and restrict the nut 241 from moving in the third direction relative to the fixing member 24.

[0100] For ease of assembly, in this embodiment, the fastener 24 also has a mounting hole 244. The diameter of the mounting hole 244 is larger than the width of the positioning groove 242, and one end of the mounting hole 244 is connected to the positioning groove 242. The mounting hole 244 assists in the assembly of the nut 241, and the area of ​​the mounting hole 244 is also larger than the cross-sectional area of ​​the nut 241. During assembly, one end of the nut 241 is first inserted into the mounting hole 244 until the mating groove 243 on the outer side wall of the nut 241 is horizontally aligned with the positioning groove 242. Then, a force is applied to drive the nut 241 into the positioning groove 242. During this process, the two sidewalls of the positioning groove 242 are embedded into the mating groove 243 of the nut 241.

[0101] In addition, in this embodiment, the fixing member 24 also has an anti-disengagement groove 245, and the nut 241 is provided with an elastic hook 246, which is embedded in the anti-disengagement groove 245. Specifically, the elastic hook 246 includes a rod extending outward from the side wall of the nut 241 and a hook located at the end of the rod. The hook abuts against the side wall of the anti-disengagement groove 245 to restrict the nut 241 from sliding in the direction of exiting the positioning groove 242.

[0102] For ease of assembly, an anti-disengagement groove 245 is formed on the side wall of the mounting hole 244 away from the positioning groove 242. When installing the nut 241, after one end of the nut 241 is inserted into the mounting hole 244, its rod portion bends and deforms, and the hook portion abuts against the surface of the fixing member 24. As the nut 241 slides into the positioning groove 242, the hook portion slides on the surface of the fixing member 24 and gradually approaches the anti-disengagement groove 245. When the nut 241 slides into place in the positioning groove 242, the hook portion is embedded in the anti-disengagement groove 245 and faces the side wall of the anti-disengagement groove 245 away from the positioning groove 242, thus preventing the nut 241 from sliding close to the mounting hole 244.

[0103] In summary, the vehicle seat headrest 10 provided in this embodiment has a locking member 14 with multiple locking portions 141 that cooperate with the sliding member 12, thereby reliably locking the sliding member 12. Furthermore, the multiple locking portions 141 are integrated on the locking member 14, simplifying the overall structure and reducing the number of parts. Under the action of the unlocking member 15, the locking member 14 can drive the multiple locking portions 141 to move synchronously until the sliding member 12 disengages, ensuring the consistency of the unlocking action.

[0104] Therefore, the vehicle seat headrest 10 provided by this utility model has the characteristics of lower assembly difficulty and manufacturing cost, and smoother and more stable unlocking operation, which can significantly improve the user experience.

[0105] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vehicle seat headrest, characterized in that, include: Base (11); A slider (12) is used to connect the headrest cover (13) and slide in cooperation with the base (11) to form a sliding of the headrest cover (13) toward or away from the base (11) in a first direction; A locking member (14) is movably disposed on the base (11). The locking member (14) has a plurality of locking parts (141), and the plurality of locking parts (141) cooperate with the sliding member (12) to lock the sliding member (12). The unlocking member (15) is connected to the locking member (14) in a transmission manner. The unlocking member (15) is configured to be forced to move the locking member (14) to disengage the multiple locking parts (141) from the sliding member (12) in order to release the locking of the sliding member (12).

2. The vehicle seat headrest according to claim 1, characterized in that, The unlocking member (15) is slidably engaged with the base (11) and can slide relative to the base (11) in a second direction; the locking member (14) is slidably engaged with the base (11) and can slide relative to the base (11) in a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

3. The vehicle seat headrest according to claim 2, characterized in that, The locking member (14) includes a main body (142) extending in the second direction, and two locking parts (141) are respectively disposed at both ends of the main body (142).

4. The vehicle seat headrest according to claim 3, characterized in that, The locking member (14) further includes two mating parts (144), which are respectively disposed at both ends of the main body (142) and respectively located on one side of the two locking parts (141) in the first direction; Both of the mating parts (144) are provided with mating inclined surfaces (145), and the unlocking member (15) is provided with two pushing inclined surfaces (151). The two pushing inclined surfaces (151) are respectively attached to the two mating inclined surfaces (145). The unlocking member (15) pushes the mating inclined surfaces (145) through the pushing inclined surfaces (151) to drive the locking member (14) to move.

5. The vehicle seat headrest according to claim 3, characterized in that, The main body (142) is provided with a hanging part (146). The vehicle seat headrest (10) also includes a first elastic member (16), one end of which is connected to the hanging part (146) and the other end is connected to the base (11). The first elastic member (16) is used to continuously apply an elastic force to the locking member (14) to drive the multiple locking parts (141) to cooperate with the sliding member (12).

6. The vehicle seat headrest according to claim 2, characterized in that, One of the locking part (141) and the base (11) is provided with a groove (143) extending upward from the third party, and the other is provided with a protrusion (111) that extends into the groove (143) and slides in cooperation with the groove (143).

7. The vehicle seat headrest according to claim 2, characterized in that, The vehicle seat headrest (10) also includes a second elastic member (19), the two ends of which abut against the unlocking member (15) and the base (11) respectively to provide the restoring force of the unlocking member (15).

8. The vehicle seat headrest according to claim 7, characterized in that, The base (11) is provided with a mounting beam (112) extending in the second direction, the sliding member (12) is passed through the base (11) by the mounting beam (112) on one side of the third direction, and the locking member (14) is located on the other side of the mounting beam (112) in the third direction. The mounting beam (112) is provided with a plurality of clearance holes (113) corresponding to the plurality of locking parts (141). Each locking part (141) passes through a corresponding clearance hole (113) so that the locking member (14) cooperates with the sliding member (12).

9. The vehicle seat headrest according to claim 8, characterized in that, The vehicle seat headrest (10) also includes a headrest insert (17) and a lifting motor (18). The base (11) is sleeved on the headrest insert (17). The lifting motor (18) is located on the side of the mounting beam (112) where the locking member (14) is located. The lifting motor (18) is connected to the headrest insert (17) for driving the base (11) to move along the headrest insert (17) in the third direction.

10. The vehicle seat headrest according to claim 8, characterized in that, The unlocking member (15) is provided with a limiting spring buckle (152), and the surface of the mounting beam (112) is recessed with a limiting groove (115). The limiting spring buckle (152) is inserted into the limiting groove (115), and is configured such that when the unlocking member (15) is subjected to force and moves along the second direction until the locking part (141) and the sliding member (12) are disengaged, the limiting spring buckle (152) moves in the limiting groove (115); and when the unlocking member (15) is restored by the action of the second elastic member (19), the limiting spring buckle (152) is restricted from disengaging from the limiting groove (115).

11. The vehicle seat headrest according to claim 2, characterized in that, The slider (12) has a plurality of locking slots (121) corresponding to the plurality of locking parts (141), and each locking slot (121) includes a plurality of locking slots (122) arranged sequentially in the first direction. Each of the locking parts (141) is inserted along the third direction into one of the plurality of locking slots (122) of the corresponding locking slot queue (121).

12. The vehicle seat headrest according to claim 2, characterized in that, The base (11) also has two guide grooves spaced apart in the first direction, and the unlocking member (15) is slidably disposed in the guide grooves. Each guide groove includes two limiting flanges (114) spaced apart in the third direction and extending along the second direction.

13. The vehicle seat headrest according to claim 1, characterized in that, The vehicle seat headrest (10) also includes a headrest back cover (20) connected to the headrest front cover (13) and a button assembly (21) disposed on the headrest back cover (20), wherein the unlocking member (15) abuts against the button assembly (21).

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