Headrest adjustment device and seat

Abstract

The present invention provides a headrest adjustment device and a seat, and relates to the technical field of seat headrest adjustment. The headrest adjustment device provided by the present invention includes a slide rail, a slide cover assembly, and an adjustment mechanism. The slide cover assembly has an adjustment channel, the slide rail passes through the adjustment channel and is movably connected to the slide cover assembly along its own extension direction, and the adjustment mechanism is installed on the slide cover assembly and cooperates with the slide rail to lock or unlock the position of the slide rail relative to the slide cover assembly. The headrest adjustment device provided by the present invention adopts a modular design, and only simple connectors such as screws are needed to connect the headrest and the seat back to the headrest adjustment device, respectively, so as to realize multiple uses of one pillow, and there is no need to install complex structures on the headrest and the seat back, thereby reducing the mold opening cost.

Description

Technical Field

[0001] The invention relates to the technical field of seat headrest adjustment, in particular to a headrest adjustment device and a seat. Background Art

[0002] When designing a car seat or a child safety seat, a headrest adjustment device is usually provided to facilitate raising or lowering the headrest height of the seat. However, the existing headrest adjustment device has the following disadvantages:

[0003] 1. The headrest adjustment device can only be adapted to a certain type of headrest. The so-called "universal" is just a false "universal" in terms of structure, and it cannot be directly universal in a fool-proof manner.

[0004] 2. The headrest and the seat back cannot be assembled in a truly modular manner. That is, when installing, some other mechanical parts need to be installed on the headrest or the seat back first and then installed in pairs;

[0005] 3. The existing paired structure requires complex structures on both the headrest and the seat back, which increases the mold cost;

[0006] 4. The headrest adjustment device experiences sliding friction and makes unusual noises when sliding up and down, which cannot provide a good experience for the user. Summary of the invention

[0007] The object of the present invention is to provide a headrest adjustment device and a seat, which adopt a modular design and do not require complex structures to be added to the headrest and the seat back during installation, thereby reducing the mold opening cost.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] In a first aspect, the present invention provides a headrest adjustment device, comprising a slide rail, a slide cover assembly and an adjustment mechanism, wherein the slide cover assembly has an adjustment channel, the slide rail passes through the adjustment channel and is movably connected to the slide cover assembly along its own extension direction, and the adjustment mechanism is installed on the slide cover assembly and cooperates with the slide rail to lock or unlock the position of the slide rail relative to the slide cover assembly.

[0010] Furthermore, the sliding cover assembly includes an upper cover and a lower cover connected to the upper cover, the adjustment channel is formed between the upper cover and the lower cover, and the adjustment mechanism is installed on the upper cover.

[0011] Furthermore, a plurality of first balls are provided between the upper cover and the slide rail, and the plurality of first balls are used to reduce friction between the upper cover and the slide rail.

[0012] Furthermore, a plurality of second balls are provided between the lower cover and the slide rail, and the plurality of second balls are used to reduce friction between the lower cover and the slide rail.

[0013] Further, the adjustment mechanism includes a clamping assembly and a release assembly;

[0014] The clamping assembly is slidably disposed on the upper cover, and the sliding direction is perpendicular to the extending direction of the slide rail, and the clamping assembly has a tendency to be clamped on the slide rail;

[0015] The release assembly is slidably disposed on the upper cover, and the sliding direction is parallel to the extending direction of the slide rail. The release assembly cooperates with the inclined surface of the clamping assembly so that when the release assembly slides, the clamping assembly is pushed by the release assembly to separate from the slide rail.

[0016] Furthermore, the clamping assembly includes a force storage spring and a latch tongue, the latch tongue is slidably configured on the upper cover and cooperates with the inclined surface of the release assembly, and the sliding direction is perpendicular to the extension direction of the slide rail. The force storage spring is located between the upper cover and the latch tongue, and the latch tongue has a tendency to be fixed to the slide rail under the action of the elastic force of the force storage spring.

[0017] Furthermore, the latch tongue includes a plug-in block and a card block connected to the plug-in block, the end of the plug-in block facing away from the card block is slidably plugged into the upper cover, and the end surface of the plug-in block close to the card block has a first inclined surface that cooperates with the release assembly.

[0018] Furthermore, the release assembly includes a reset spring and a release plate, the release plate is slidably configured on the upper cover and cooperates with the inclined surface of the clamping assembly, and the sliding direction is parallel to the extension direction of the slide rail. The reset spring connects the upper cover and the release plate, and the reset spring is used to pull the release plate to reset after sliding.

[0019] Furthermore, the release piece includes a connecting frame and a pushing block connected to the connecting frame, the connecting frame is slidably connected to the upper cover, and the surface of the pushing block facing the connecting frame has a second inclined surface that cooperates with the snap-on assembly.

[0020] In a second aspect, the present invention further provides a seat, comprising a seat back, a seat cushion, a headrest, and the headrest adjustment device described in the above scheme, wherein the seat cushion is connected to the seat back;

[0021] The seat back is connected to the slide rail, and the headrest is connected to the slide cover assembly;

[0022] Alternatively, the seat back is connected to the sliding cover assembly, and the headrest is connected to the sliding rail.

[0023] The headrest adjustment device and seat provided by the present invention can produce the following beneficial effects:

[0024] When the headrest adjustment device is used to connect the headrest and the seat back, the slide rail and the seat back can be directly connected by simple connectors such as screws, and then the slide cover assembly can be connected to the headrest by simple connectors such as screws, or vice versa, the slide rail and the headrest can be connected, and the slide cover assembly can be connected to the seat back; when the height of the headrest needs to be adjusted, the adjustment mechanism first releases the locking state of the slide rail and the slide cover assembly, and adjusts the position of the slide cover assembly relative to the slide rail along the extension direction of the slide rail. After the adjustment is completed, the adjustment mechanism can be used to lock the position of the slide rail relative to the slide cover assembly.

[0025] Compared with the prior art, the slide rail in the headrest adjustment device provided by the first aspect of the present invention passes through the adjustment channel on the sliding cover assembly. The headrest adjustment device adopts a modular design and has a compact structure. The adjustment mechanism on the sliding cover assembly directly cooperates with the slide rail to realize the adjustment function. Therefore, when in use, only simple connecting parts such as screws are needed to connect the headrest and the seat back to the above-mentioned headrest adjustment device respectively, thereby realizing multiple uses of one pillow, eliminating the need for complex structures on the headrest and the seat back, and reducing mold opening costs.

[0026] Compared with the prior art, the seat provided in the second aspect of the present invention comprises a seat back, a seat cushion, a headrest and the above-mentioned headrest adjustment device, which is easy to assemble and does not require a complex connection structure between the headrest and the seat back. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a headrest adjustment device provided in an embodiment of the present invention;

[0029] Figure 2 An exploded view of a headrest adjustment device provided in an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the three-dimensional structure of a slide rail provided in an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the three-dimensional structure of the upper cover provided in an embodiment of the present invention;

[0032] Figure 5A schematic diagram of a three-dimensional structure when the upper cover provided by an embodiment of the present invention is connected to the adjustment mechanism;

[0033] Figure 6 A schematic diagram of the three-dimensional structure of a latch provided in an embodiment of the present invention;

[0034] Figure 7 A schematic diagram of the three-dimensional structure of a release piece provided in an embodiment of the present invention;

[0035] Figure 8 A cross-sectional view of a headrest adjustment device in which the adjustment mechanism provided by an embodiment of the present invention is in a first working position;

[0036] Fig. 9 for Figure 8 A local enlarged schematic diagram of point A;

[0037] Fig.10 A cross-sectional view of a headrest adjustment device in which the adjustment mechanism provided by an embodiment of the present invention is in the second working position;

[0038] Fig.11 for Fig.10 A local enlarged schematic diagram of point B;

[0039] Fig.12 An exploded view of a seat provided in an embodiment of the present invention.

[0040] Icons: 1-slide rail; 2-slide cover assembly; 21-upper cover; 22-lower cover; 3-adjustment mechanism; 31-clamping assembly; 311-force storage spring; 312-clamping tongue; 3121-plug-in block; 3122-clamping block; 3123-first inclined plane; 32-release assembly; 321-reset spring; 322-release plate; 3221-connecting frame; 3222-pushing block; 3223-second inclined plane; 4-first ball bearing; 5-second ball bearing; 6-seat back; 7-seat cushion; 8-headrest. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0045] The embodiment of the first aspect of the present invention is to provide a headrest adjustment device, such as Figure 1 and Figure 2 As shown, it includes a slide rail 1, a slide cover assembly 2 and an adjustment mechanism 3. The slide cover assembly 2 has an adjustment channel. The slide rail 1 passes through the adjustment channel and is movably connected to the slide cover assembly 2 along its own extension direction. The adjustment mechanism 3 is installed on the slide cover assembly 2 and cooperates with the slide rail 1 to lock or unlock the position of the slide rail 1 relative to the slide cover assembly 2.

[0046] In the above-mentioned headrest adjustment device, the position of the slide rail 1 relative to the slide cover assembly 2 can be adjusted by the adjustment mechanism 3, which has a compact structure and does not require the headrest 8 and the seat back 6 to be equipped with other mechanism components to cooperate therewith, so the installation process is convenient and simple.

[0047] The structure of the slide rail 1 is described in detail below:

[0048] like Figure 3 As shown, along the extension direction of the slide rail 1, the slide rail 1 has a slot, and the slot has a plurality of continuous snap positions. When the adjustment mechanism 3 locks the position of the slide rail 1 relative to the slide cover assembly 2, the adjustment mechanism 3 snaps into any snap position on the slot.

[0049] The structure of the sliding cover assembly 2 is described in detail below:

[0050] like Figure 1 and Figure 5 As shown, the sliding cover assembly 2 includes an upper cover 21 and a lower cover 22 connected to the upper cover 21 , an adjustment channel is formed between the upper cover 21 and the lower cover 22 , and the adjustment mechanism 3 is installed on the upper cover 21 .

[0051] The separate arrangement of the slide cover assembly 2 facilitates the connection between the slide rail 1 and the slide cover assembly 2 , and also facilitates the installation of the adjustment mechanism 3 .

[0052] Specifically, Figure 2 As shown, the lower cover 22 includes a connection plate with a concave U-shaped structure and wing plates connected to both sides of the connection plate, and the connection plate cooperates with the upper cover 21 to form an adjustment channel; the upper cover 21 is concave with a U-shaped structure, and the adjustment mechanism 3 is installed in the concave cavity of the upper cover 21. When the upper cover 21 is connected to the lower cover 22, the two side plates of the upper cover 21 extend into the concave cavity of the lower cover 22, and the top plate of the upper cover 21 is basically in the same horizontal plane as the two wing plates of the lower cover 22.

[0053] The upper cover 21 and the lower cover 22 may be connected in a variety of ways, specifically, they may be connected by screws, or the upper cover 21 and the lower cover 22 may be snap-fitted, and so on.

[0054] In at least one embodiment, the upper cover 21 is connected to the lower cover 22 by screws, and the connecting plate of the lower cover 22 and the upper cover 21 are provided with threaded holes for connection with the screws. In order to facilitate the alignment of the screw holes on the upper cover 21 with the screw holes of the lower cover 22, the inner surfaces of the two side plates in the connecting plate have longitudinal grooves, and the outer surfaces of the two side plates of the upper cover 21 have protrusions that match the longitudinal grooves. When it is necessary to buckle the upper cover 21 on the lower cover 22, the protrusions are aligned with the grooves and pushed into the grooves to ensure that the upper cover 21 is accurately buckled on the lower cover 22.

[0055] In some embodiments, Figure 2 and Fig. 9 As shown, a plurality of first balls 4 are provided between the upper cover 21 and the slide rail 1 , and the plurality of first balls 4 are used to reduce the friction between the upper cover 21 and the slide rail 1 .

[0056] In the above embodiment, the rolling friction of the first ball 4 replaces the traditional sliding friction, which makes the operation smoother and solves the problem of abnormal noise caused by the sliding friction between the upper cover 21 and the slide rail 1.

[0057] In some embodiments, a plurality of second balls 5 are disposed between the lower cover 22 and the slide rail 1 , and the plurality of second balls 5 are used to reduce friction between the lower cover 22 and the slide rail 1 .

[0058] In the above embodiment, the rolling friction of the second ball 5 replaces the traditional sliding friction, which makes the operation smoother and solves the problem of abnormal noise caused by the sliding friction between the lower cover 22 and the slide rail 1.

[0059] In at least one embodiment, Figure 2 As shown, four first balls 4 are arranged between the upper cover 21 and the slide rail 1, and the four first balls 4 are half-embedded in the upper cover 21. Meanwhile, four second balls 5 are arranged between the lower cover 22 and the slide rail 1, and the four second balls 5 are half-embedded in the lower cover 22. The above arrangement enables the slide rail 1 to only have rolling friction with the slide cover assembly 2 during the adjustment process, and has a better mute effect.

[0060] The structure of the adjustment mechanism 3 is described in detail below:

[0061] It should be noted that any structure capable of locking or unlocking the position of the slide rail 1 relative to the slide cover assembly 2 can be the adjustment mechanism 3 mentioned in the above embodiment. For example, the adjustment mechanism 3 includes an elastic buckle that cooperates with the slide rail 1, or the adjustment mechanism 3 includes a bolt and a nut, and along the extension direction of the slide rail 1, the slide rail 1 is provided with a plurality of connection holes, and the bolts can pass through the connection holes and cooperate with the nuts.

[0062] In some embodiments, Figure 5 As shown, the adjustment mechanism 3 includes a clamping assembly 31 and a releasing assembly 32; the clamping assembly 31 is slidably configured on the upper cover 21, and the sliding direction is perpendicular to the extension direction of the slide rail 1, and the clamping assembly 31 has a tendency to be clamped on the slide rail 1; the releasing assembly 32 is slidably configured on the upper cover 21, and the sliding direction is parallel to the extension direction of the slide rail 1, and the releasing assembly 32 cooperates with the inclined surface of the clamping assembly 31, so that when the releasing assembly 32 slides, the clamping assembly 31 is separated from the slide rail 1 under the pushing of the releasing assembly 32.

[0063] by Figure 5 For example, in the initial state, the clamping assembly 31 is clamped on the slide rail 1, and the slide cover assembly 2 cannot move relative to the slide rail 1; when the position of the slide cover assembly 2 needs to be adjusted, the release assembly 32 is pulled to the right, and since the release assembly 32 cooperates with the inclined surface of the clamping assembly 31, the release assembly 32 pushes the clamping assembly 31 downward, so that the clamping assembly 31 is separated from the slide rail 1, and then the position of the slide cover assembly 2 can be adjusted. After the adjustment is completed, the release assembly 32 is released, and the release assembly 32 returns to the initial state. The above-mentioned adjustment mechanism 3 is easy to adjust, and the position of the slide cover assembly 2 can be adjusted by only pulling the release assembly 32, and the locking is reliable, which has strong practicality.

[0064] Among them, Figure 5As shown, the clamping assembly 31 includes a force storage spring 311 and a clamping tongue 312. The clamping tongue 312 is slidably arranged on the upper cover 21 and cooperates with the inclined surface of the lock release assembly 32, and the sliding direction is perpendicular to the extension direction of the slide rail 1. The force storage spring 311 is located between the upper cover 21 and the clamping tongue 312. The clamping tongue 312 has a tendency to be clamped to the slide rail 1 under the elastic force of the force storage spring 311. Compared with the clamping structure using elastic materials, the clamping assembly 31 is more stable and firm, and the clamping tongue 312 can have a larger moving stroke.

[0065] Specifically, when in use, the latch tongue 312 is latched on the slide rail 1 under the elastic force of the force storage spring 311 , and after the release assembly 32 is pulled, the release assembly 32 pushes the latch tongue 312 through the inclined surface, and the latch tongue 312 overcomes the elastic force of the force storage spring 311 and moves in a direction away from the slide rail 1 .

[0066] Specifically, Figure 6 As shown, the latch tongue 312 includes a plug-in block 3121 and a card block 3122 connected to the plug-in block 3121. The end of the plug-in block 3121 facing away from the card block 3122 is slidably plugged into the upper cover 21 to ensure that the latch tongue 312 slides stably relative to the upper cover 21. The end face of the plug-in block 3121 close to the card block 3122 has a first inclined surface 3123 that cooperates with the release assembly 32.

[0067] In addition, in order to ensure that the latch tongue 312 is firmly connected to the upper cover 21, the end of the plug-in block 3121 away from the latch block 3122 has a latch block that is latched with the top surface of the upper cover 21. The latch block serves as a limit to prevent the latch tongue 312 from falling off the upper cover 21 under the action of the force storage spring 311.

[0068] Among them, Figure 5 and Figure 7 As shown, the release assembly 32 includes a return spring 321 and a release piece 322. The release piece 322 is slidably disposed on the upper cover 21 and cooperates with the inclined surface of the clamping assembly 31, and the sliding direction is parallel to the extension direction of the slide rail 1. The return spring 321 connects the upper cover 21 and the release piece 322. The return spring 321 is used to pull the release piece 322 to reset after sliding. The release assembly 32 does not need to be reset manually, which is more convenient for people to use and easier to operate.

[0069] Specifically, when in use, the release piece 322 is maintained in the initial state under the action of the return spring 321, that is, the latch tongue 312 is not squeezed. After overcoming the elastic force of the return spring 321 to pull the release piece 322, the release piece 322 pushes the latch tongue 312 through the inclined surface to unlock the position of the slide rail 1 relative to the slide cover assembly 2.

[0070] Specifically, Figure 7As shown, the release piece 322 includes a connecting frame 3221 and a pushing block 3222 connected to the connecting frame 3221 . The connecting frame 3221 is slidably connected to the upper cover 21 . The surface of the pushing block 3222 facing the connecting frame 3221 has a second inclined surface 3223 that cooperates with the snap-on assembly 31 .

[0071] The connecting frame 3221 allows the latch tongue 312 to pass through and connect with the upper cover 21. The second inclined surface 3223 on the pushing block 3222 can cooperate with the first inclined surface 3123, so that the pushing block 3222 can push the latch tongue 312 when moving. The release piece 322 has a simple structure and is convenient for installing the clamping assembly 31 and the upper cover 21.

[0072] Along the moving direction of the connecting frame 3221, one end of the connecting frame 3221 is provided with a first traction seat, and the other end is provided with a pull rod, and the length direction of the pull rod is perpendicular to the moving direction of the connecting frame 3221; one end of the return spring 321 is connected to the first traction seat, and the other end is connected to the second traction seat on the upper cover 21; Figure 4 As shown, the upper cover 21 has an opening for the pull rod to pass through, and the user can move the connecting frame 3221 by pulling the pull rod, which is more convenient for the user to exert force.

[0073] The following Figures 8 to 11 The working principle of the headrest adjustment device is described in detail:

[0074] like Figures 8 to 9 As shown, in the initial state, the latch tongue 312 is clamped in the slot of the slide rail 1 under the pressure of the elastic force of the force storage spring 311, and the adjustment mechanism 3 is in a locked state; Figure 10 to Figure 11 When the locking plate 322 is pulled horizontally to the left to overcome the elastic force of the return spring 321, the second inclined surface 3223 of the locking plate 322 compresses and pushes the first inclined surface 3123 upward, and the latch tongue 312 slides upward to disengage from the latch slot, and the adjustment mechanism 3 is in an unlocked state; after unlocking, the sliding cover assembly 2 can roll arbitrarily on the slide rail 1 through the first ball 4 and the second ball 5; when the sliding cover assembly 2 moves to a suitable position, the locking plate 322 is released, and the locking plate 322 will reset under the pulling force of the return spring 321 and no longer squeeze the latch tongue 312. At the same time, the latch tongue 312 will be re-engaged in the slide rail 1 under the elastic force of the force storage spring 311, and the adjustment mechanism 3 is in a locked state again.

[0075] To sum up, the above-mentioned headrest adjustment device adopts a modular design. When in use, it is first fixed to the seat back 6 by screws or other simple connecting parts, and then the headrest 8 is connected to the device by screws or other simple connecting parts, thereby achieving the purpose of connecting the headrest 8 to the seat back 6. For the headrest 8, only a few standard screw holes are needed to achieve multiple uses of one pillow. The adjustment process is convenient, stable and reliable. At the same time, a certain number of balls are embedded in the device, and the rolling friction of the balls replaces the traditional sliding friction. The operation is smoother and the abnormal noise problem caused by sliding friction is solved.

[0076] The embodiment of the second aspect of the present invention is to provide a seat, such as Fig.12 As shown, the seat provided by the embodiment of the second aspect of the present invention comprises a seat back 6, a seat cushion 7, a headrest 8 and the above-mentioned headrest adjustment device, and the seat cushion 7 is connected to the seat back 6;

[0077] The seat back 6 is connected to the slide rail 1, and the headrest 8 is connected to the slide cover assembly 2;

[0078] Alternatively, the seat back 6 is connected to the slide cover assembly 2 , and the headrest 8 is connected to the slide rail 1 .

[0079] Compared with the prior art, the seat provided by the embodiment of the second aspect of the present invention includes a seat back 6, a seat cushion 7, a headrest 8 and the above-mentioned headrest adjustment device, which is easy to assemble and does not require the headrest 8 and the seat back 6 to have a more complicated connection structure.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A headrest adjustment device, characterized in that: The invention comprises a slide rail (1), a slide cover assembly (2) and an adjustment mechanism (3), wherein the slide cover assembly (2) has an adjustment channel, the slide rail (1) passes through the adjustment channel and is movably connected to the slide cover assembly (2) along its own extension direction, and the adjustment mechanism (3) is installed on the slide cover assembly (2) and cooperates with the slide rail (1) to lock or unlock the position of the slide rail (1) relative to the slide cover assembly (2); The sliding cover assembly (2) comprises an upper cover (21) and a lower cover (22) connected to the upper cover (21), the adjustment channel is formed between the upper cover (21) and the lower cover (22), and the adjustment mechanism (3) is mounted on the upper cover (21); The adjustment mechanism (3) comprises a clamping assembly (31) and a release assembly (32); The clamping assembly (31) is slidably disposed on the upper cover (21), and the sliding direction is perpendicular to the extension direction of the slide rail (1), and the clamping assembly (31) has a tendency to be clamped on the slide rail (1); The lock release component (32) is slidably disposed on the upper cover (21), and the sliding direction is parallel to the extension direction of the slide rail (1). The lock release component (32) cooperates with the inclined surface of the clamping component (31) so that when the lock release component (32) slides, the clamping component (31) is separated from the slide rail (1) under the pushing of the lock release component (32); The clamping assembly (31) comprises a force storage spring (311) and a clamping tongue (312); the clamping tongue (312) is slidably arranged on the upper cover (21) and cooperates with the inclined surface of the lock release assembly (32), and the sliding direction is perpendicular to the extension direction of the slide rail (1); the force storage spring (311) is located between the upper cover (21) and the clamping tongue (312); and the clamping tongue (312) has a tendency to be clamped to the slide rail (1) under the action of the elastic force of the force storage spring (311); The lock release assembly (32) comprises a return spring (321) and a lock release sheet (322); the lock release sheet (322) is slidably arranged on the upper cover (21) and cooperates with the inclined surface of the clamping assembly (31), and the sliding direction is parallel to the extension direction of the slide rail (1); the return spring (321) connects the upper cover (21) and the lock release sheet (322); the return spring (321) is used to pull the lock release sheet (322) to return to its original position after sliding.

2. The headrest adjustment device according to claim 1, characterized in that: A plurality of first rolling balls (4) are provided between the upper cover (21) and the slide rail (1), and the plurality of first rolling balls (4) are used to reduce friction between the upper cover (21) and the slide rail (1).

3. The headrest adjustment device according to claim 1, characterized in that: A plurality of second rolling balls (5) are provided between the lower cover (22) and the slide rail (1), and the plurality of second rolling balls (5) are used to reduce friction between the lower cover (22) and the slide rail (1).

4. The headrest adjustment device according to claim 1, characterized in that: The latch tongue (312) comprises a plug-in block (3121) and a clamping block (3122) connected to the plug-in block (3121); an end of the plug-in block (3121) facing away from the clamping block (3122) is slidably plugged into the upper cover (21); and an end surface of the plug-in block (3121) close to the clamping block (3122) has a first inclined surface (3123) that cooperates with the lock release assembly (32).

5. The headrest adjustment device according to claim 1, characterized in that: The release piece (322) comprises a connecting frame (3221) and a pushing block (3222) connected to the connecting frame (3221); the connecting frame (3221) is slidably connected to the upper cover (21); and the surface of the pushing block (3222) facing the connecting frame (3221) has a second inclined surface (3223) that cooperates with the snap-on assembly (31).

6. A seat, characterized in that: It comprises a chair back (6), a seat cushion (7), a headrest (8) and a headrest adjustment device according to any one of claims 1 to 5, wherein the seat cushion (7) is connected to the chair back (6); The chair back (6) is connected to the slide rail (1), and the headrest (8) is connected to the slide cover assembly (2); Alternatively, the chair back (6) is connected to the sliding cover assembly (2), and the headrest (8) is connected to the sliding rail (1).

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