Headrest height adjustment mechanism and seat furniture

Abstract

The utility model discloses a headrest height adjusting mechanism and seat, the headrest height adjusting mechanism includes: fixed part and sliding part, fixed part is equipped with first slide groove, and sliding part includes elasticity component and the sliding piece of fixed part side, and the sliding piece is connected in first slide groove, can slide up and down to fixed part, and elasticity component and the sliding piece and fixed part are linked, and elasticity component has first part and has second part in the opposite side of the one side of sliding piece, and first part and second part can be close to each other or away from each other under the action of external force, and the clamping force of elasticity component to sliding piece is adjusted or reduced, to adjust the friction of relative movement between sliding part and fixed part. The utility model realizes the sliding fit of sliding piece and fixed part through first slide groove, realizes the adjustment of the friction between sliding piece and fixed part through the distance of first part and second part, realizes the flexible and persistent height adjustment of headrest.

Description

Technical Field

[0001] This utility model relates to the field of headrest height adjustment technology, and in particular to a headrest height adjustment mechanism and a seat. Background Technology

[0002] In various seating products such as airplane seats, car seats, office chairs, massage chairs, and sofas, headrests are crucial components for ensuring neck comfort and safety. However, most headrests on the market are not height-adjustable. Understandably, people have different sitting postures and heights, and this lack of headrest height adjustment will, to some extent, affect the user's seating experience. Utility Model Content

[0003] This utility model provides a headrest height adjustment mechanism and a seat, aiming to solve the problem that the existing headrest height cannot be adjusted, which affects the user experience.

[0004] In a first aspect, embodiments of the present invention provide a headrest height adjustment mechanism, comprising:

[0005] The fixed component is provided with a first sliding groove that extends vertically.

[0006] A sliding component is used to mount a headrest and can slide up and down relative to the fixed component. The sliding component includes a tensioning assembly and a sliding member located on the side of the fixed component. The sliding member is connected to the first sliding groove and can slide up and down relative to the fixed component. The tensioning assembly, the sliding member, and the fixed component are connected, and a first part of the tensioning assembly is located on one side of the sliding member, and a second part is located on the opposite side of the sliding member. The first part and the second part can move closer to or further away from each other under the action of external force, thereby increasing or decreasing the clamping force of the tensioning assembly on the sliding member to adjust the friction between the sliding component and the fixed component during relative movement.

[0007] In one embodiment, the fixing component is provided with a second sliding groove, the extension direction of the second sliding groove being parallel to the extension direction of the first sliding groove, and the tensioning component has a third part inserted into the second sliding groove, and the third part being kinetically connected to the sliding member.

[0008] In one embodiment, the tightening assembly further includes a fastener and a rotating member that is the first part; the sliding member has a through hole, and a portion of the second sliding groove communicates with the through hole; the fastener passes through the second sliding groove and the through hole, and the portion of the fastener that passes through the second sliding groove belongs to the third part; one end of the fastener has a limiting portion that is the second part; the rotating member is screwed to the end of the fastener away from the limiting portion.

[0009] In one embodiment, the tensioning assembly further includes: a slider; the slider is fixedly connected to the side wall of the sliding member near the fixed member, the slider passes through and is slidably connected to the second slide groove, the slider is provided with a through hole, and the fastener passes through the through hole, the through hole and the second slide groove; the proximity and distance between the first part and the second part are used to affect the frictional force of the slider sliding in the second slide groove.

[0010] In one embodiment, the number of the second slide grooves corresponds one-to-one with the number of the tensioning components; the headrest height adjustment mechanism includes two second slide grooves and two tensioning components; the two tensioning components are respectively inserted into the two second slide grooves; the first slide groove is located between the two second slide grooves.

[0011] In one embodiment, the sliding component further includes a sliding portion; one end of the sliding portion is movably connected to the sliding member, and the other end is slidably connected to the first sliding groove.

[0012] In one embodiment, the sliding part includes: a first elastic member and a locking block; one end of the first elastic member is connected to the sliding member, and the other end is connected to the locking block, and can apply an elastic force to the locking block and the sliding member; one end of the locking block away from the first elastic member is engaged with the inner sidewall of the first sliding groove; the sliding member is provided with a third sliding groove, the locking block is slidably connected to the third sliding groove, and the first elastic member is disposed between the inner wall of the third sliding groove and the locking block.

[0013] In one embodiment, the inner sidewall of the first slide groove is provided with a plurality of locking grooves, which are linearly distributed from top to bottom in the first slide groove, and the width of the first slide groove changes periodically in the vertical direction; the sliding member can carry the locking block into and out of different locking grooves under the action of external force, and after the action of external force disappears, it engages with a locking groove by the first elastic member and is suspended relative to the fixed member.

[0014] In one embodiment, it further includes: a mounting component; the mounting component is used to connect a headrest, and the mounting component is detachably connected to the side of the slider away from the fixed component.

[0015] In one embodiment, the mounting component includes: a mounting member and a locking member; the locking member is slidably connected to the mounting member and can slide relative to the mounting member; the mounting member has a first through hole, and the locking member has a second through hole, the center lines of the second through hole and the first through hole can be at different heights; when the center lines of the second through hole and the first through hole are at different heights, the second through hole and the first through hole are staggered, and a portion of the locking member located on the periphery of the second through hole blocks the first through hole, forming a blocking portion;

[0016] The sliding member has a protruding locking post on the side away from the fixed component. The locking post is coaxially arranged with the first through hole. The end of the locking post away from the sliding member has a limiting groove. The locking post passes through the first through hole and the second through hole. The limiting groove and the blocking part are engaged, so that the locking post and the locking component are engaged.

[0017] The locking pin is configured to apply force to the blocking part after penetrating the first through hole to remove the blocking part, and then extend into the second through hole; the locking member is configured to move relative to the mounting member to release itself from the locking pin and separate from the sliding member.

[0018] In one embodiment, the lower part of the mounting member is provided with a groove that is concave relative to its periphery, and a protruding post extends downward from the bottom of the groove; the locking member includes a locking member body and a bent portion extending from the locking member body toward the mounting member; the bent portion extends into the groove and to the lower side of the protruding post, forming a slidable connection between the mounting member and the locking member; a second elastic member is provided between the bent portion and the groove, one end of the second elastic member engaging with the protruding post, and the other end contacting the bent portion; when the locking member slides relative to the mounting member, the length of the second elastic member adapts to change; the second elastic member is used to reset the locking member after it has slid relative to the mounting member.

[0019] In one embodiment, the mounting member is provided with a limiting post, and the locking member is provided with a guide hole, the limiting post passing through the guide hole; the guide hole can slide relative to the limiting post, and the guide hole and the limiting post are used to form a connection point between the locking member and the mounting member.

[0020] Secondly, this utility model embodiment provides a seating device, including the aforementioned headrest height adjustment mechanism and a headrest.

[0021] The advantages of this utility model compared with the prior art are as follows: This utility model realizes the sliding cooperation between the sliding part and the fixed part through the first sliding groove, realizing the flexible adjustment of the headrest height. By adjusting the distance between the first part and the second part of the tensioning component, the friction between the sliding part and the fixed part can be adjusted according to actual needs. Even if the contact surface wears down due to long-term use, the appropriate friction between the fixed part and the sliding part can still be maintained by adjusting the tensioning component, effectively avoiding the problem of loose headrest height adjustment. It eliminates the need for frequent replacement of the seat and is suitable for application scenarios where seat disassembly is difficult, such as airplanes and automobiles.

[0022] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and understandable, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0023] Figure 1 A schematic diagram of the overall structure of a headrest height adjustment mechanism provided in this embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the structure of a headrest height adjustment mechanism provided in an embodiment of this utility model from another perspective;

[0025] Figure 3 A schematic diagram of the assembly structure of the sliding component and the fixed component of a headrest height adjustment mechanism provided in an embodiment of this utility model;

[0026] Figure 4 A schematic diagram of the assembly structure of the sliding component and the fixed component of a headrest height adjustment mechanism provided in an embodiment of this utility model from another perspective;

[0027] Figure 5 A before-and-after comparison diagram of the sliding component of a headrest height adjustment mechanism before and after assembly, provided for an embodiment of this utility model;

[0028] Figure 6 A before-and-after comparison diagram of the fixed components of a headrest height adjustment mechanism provided for an embodiment of this utility model;

[0029] Figure 7 An exploded view of a headrest height adjustment mechanism provided in this embodiment of the present invention;

[0030] Figure 8 An exploded view of a headrest height adjustment mechanism provided as an embodiment of this utility model;

[0031] Figure 9A front view of the assembly structure of the mounting components and locking pin of a headrest height adjustment mechanism provided in this embodiment of the utility model;

[0032] Figure 10 for Figure 9 Schematic diagram of the cross-sectional structure at point AA;

[0033] Figure 11 A front view of the mounting components of a headrest height adjustment mechanism provided in an embodiment of this utility model;

[0034] Figure 12 for Figure 11 Schematic diagram of the cross-sectional structure at BB;

[0035] Figure 13 This is a before-and-after comparison diagram of the installation components of a headrest height adjustment mechanism provided in this embodiment of the present invention.

[0036] Figure label:

[0037] 1. Fixing component; 11. First slide groove; 111. Snap-fit ​​groove; 112. Arc-shaped protrusion; 113. Guide rail; 12. Second slide groove; 13. Fixing component; 14. Connecting component;

[0038] 2. Sliding component; 21. Sliding element; 211. Through hole; 212. Third slide groove; 213. Locking pin; 2131. Limiting groove; 22. Tightening / loosening assembly; 221. Fastener; 2211. Limiting part; 222. Rotating element; 223. Sliding block; 2231. Through hole; 23. Sliding part; 231. First elastic element; 232. Locking block;

[0039] 3. Mounting components; 31. Mounting parts; 311. First through hole; 312. Support cylinder; 313. Gasket; 314. Limiting post; 315. Groove; 316. Protruding post; 32. Locking element; 321. Second through hole; 322. Guide hole; 323. Bending part; 324. Locking element body; 33. Second elastic element. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0041] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0042] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0043] It should also be understood that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" in this utility model should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between 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.

[0044] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0045] Example 1

[0046] Please see Figure 1 and Figure 2 This utility model provides a headrest height adjustment mechanism, including: a fixed component 1 and a sliding component 2; the fixed component 1 is provided with a first sliding groove 11 extending vertically; the sliding component 2 is used to install the headrest (not shown in the figures), and can slide vertically relative to the fixed component, and the sliding component 2 includes a tensioning component 22 and a sliding member 21 located on the side of the fixed component 1; the sliding member 21 is connected to the first sliding groove 11 and can slide vertically relative to the fixed component 1; the tensioning component 22 is connected to the sliding member 21 and the fixed component 1, and the tensioning component 22 has a first part (in one embodiment, a rotating member 222, see below) located on one side of the sliding member 21, and a second part (in one embodiment, a limiting part 2211, see below) located on the opposite side of the sliding member 21; the first part and the second part can move closer or further away from each other under the action of external force, adjusting the clamping force of the tensioning component 22 on the sliding member 21 to adjust the friction force when the sliding component 2 moves relative to the fixed component 1.

[0047] In practice, the sliding component 2 and the fixed component 1 are pre-assembled to ensure that the tensioning assembly 22 connects the sliding component 21 and the fixed component 1. The initial frictional force between the sliding component 21 and the fixed component 1 is determined by setting the initial distance between the first and second parts of the tensioning assembly 22. Then, the headrest is directly installed or mounted on the sliding component 2 via the mounting component 3. Finally, the fixed component 1 is installed on the headrest plate of the seat back (not shown; the structure of the headrest plate is not limited), completing the installation of the headrest height adjustment mechanism. Under the initial frictional force, when the user needs to adjust the headrest height, a pushing or pulling force greater than the initial frictional force is applied to the headrest or the sliding component 21, causing the sliding component 21 to move along the first slide groove 11. When it reaches the predetermined position, the user stops applying the pushing or pulling force, and the sliding component 21 is set to remain stationary relative to the fixed component 1, thereby fixing the headrest height. If the headrest height adjustment mechanism becomes loose between the sliding member 21 and the fixed member 1 after a period of use, the headrest can be removed and the tensioning component 22 can be operated. Specifically, by using external force to bring the first and second parts of the tensioning component 22 closer together, the friction between the sliding member 21 and the fixed member 1 can be increased.

[0048] It should be noted that the phrase "directly mounting the headrest or mounting it on the sliding member 2 via the mounting component 3" refers to the possibility that, in possible embodiments, the headrest can be directly connected to the sliding member 2, and / or, the headrest can be directly connected to the mounting component 3. It is understood that, in other embodiments, the mounting component 3 may not be provided, and the headrest may be directly wrapped around the sliding member 2; or, the headrest may be wrapped around and connected to the mounting component 3, and there is no non-detachable connection between the headrest and both the sliding member 2 and the fixed member 1. It is also understood that, in possible embodiments, the headrest may be a soft body that is simultaneously wrapped around the combined body of the sliding member 2 and the mounting component 3. In any case, during the headrest height adjustment process, the headrest is always configured to move along the fixed member 1 with the sliding member 2.

[0049] As can be seen from the above, the headrest height adjustment mechanism of this application achieves sliding engagement between the sliding member 21 and the fixed member 1 through the first sliding groove 11, realizing flexible adjustment of the headrest height. Furthermore, by adjusting the distance between the first and second parts of the tensioning component 22, this application can adjust the frictional force between the sliding member 21 and the fixed member 1 during relative sliding according to actual needs. This ensures that even with long-term use leading to wear of the contact surface, the tensioning component 22 can still be adjusted to maintain appropriate friction between the fixed member 1 and the sliding member 2, effectively avoiding the problem of loosening of the headrest height adjustment. This eliminates the need for frequent seat replacement and is suitable for applications where seat disassembly is difficult, such as in airplanes and automobiles. Additionally, if needed, the user can also adjust the frictional force between the sliding member 2 and the fixed member 1 during relative movement according to specific requirements.

[0050] In a further embodiment, refer to Figure 2 The fixing component 1 is provided with a second slide groove 12, the extension direction of the second slide groove 12 being parallel to the extension direction of the first slide groove 11. The tensioning component 22 has a third part (in one embodiment, part of the fastener 221, as detailed below) that passes through the second slide groove 12, and the third part is connected to the sliding member 21 in a transmission manner. In specific implementation, for example, when the sliding member 21 slides up and down along the first slide groove 11, since the second slide groove 12 is parallel to the first slide groove 11, the third part of the tensioning component 22 passing through the second slide groove 12 will move up and down along the second slide groove 12 synchronously with the sliding member 21. The movement directions of the two are consistent, and there will be no movement interference, ensuring that the tensioning component 22 can continuously play the role of adjusting friction.

[0051] In a further embodiment, refer to Figure 2 and Figure 3 The tensioning assembly 22 also includes: a fastener 221 and a rotating member 222, which is the first part; the sliding member 21 is provided with a through hole 211 (see... Figure 5 The second slide groove 12 is partially connected to the through hole 211. The fastener 221 passes through the second slide groove 12 and the through hole 211, and the part of it that passes through the second slide groove 12 belongs to the third part. One end of the fastener 221 is provided with a limiting part 2211, which is the second part. The rotating member 222 is screwed to the end of the fastener 221 away from the limiting part 2211. When it is necessary to adjust the friction, the limiting part 2211 remains stationary and is as close as possible to the sliding member 21. The rotating member 222 is rotated. Since the rotating member 222 is screwed to the fastener 221, the rotating member 222 will move along the axial direction of the fastener 221, changing the distance between the rotating member 222 and the limiting part 2211, thereby realizing the adjustment of the distance between the first part and the second part. It is understandable that when the rotating member 222 moves closer to the limiting part 2211, it will push the sliding member 2 and the fixed member 1 to fit more tightly together, thereby increasing the friction between them; when the rotating member 222 moves away from the limiting part 2211, the clamping force between the sliding member 2 and the fixed member 1 decreases, and the friction decreases accordingly.

[0052] In a preferred embodiment, refer to Figure 4 and Figure 5The fastener 221 is a screw with partial threads and partial smooth rods, the limiting part 2211 is a nut, and the rotating part 222 is a nut. The nut abuts against the edge of the second sliding groove 12 away from the sliding member 21, the screw extends from the nut to the side of the sliding member 21 away from the fixing member 1, and the nut is screwed onto the end of the screw away from the nut and abuts against the edge of the through hole 211 away from the fixing member 1. In practice, rotating the nut causes it to move along the thread direction of the screw. When the nut is tightened towards the nut, the distance between the nut and the screw decreases, increasing the clamping force on the sliding member 21 and the fixing member 1, thus increasing the friction between them. When the nut rotates in the opposite direction, the clamping force between the nut and the screw on the sliding member 21 and the fixing member 1 decreases, and the friction also decreases. By utilizing the self-locking characteristic of the threaded connection to adjust the friction between the sliding member 21 and the fixing member 1, the operation is simple and the structure is stable, preventing it from loosening due to external forces such as vibration.

[0053] Understandably, in other embodiments, the first part of the tightening assembly 22 is a nut, the second part is also a nut, and the third part is a screw. The screw passes through the second sliding groove 12 and the through hole 211, and two nuts are respectively screwed to both ends of the screw, with the two nuts clamping the sliding member 21 and the fixing member 1 from both sides. By rotating one or both nuts, the distance between the two nuts, i.e., the distance between the first part and the second part, can be adjusted, thereby adjusting the friction between the sliding member 21 and the fixing member 1.

[0054] Understandably, in other embodiments, the first part of the tightening assembly 22 is a nut, the second part is also a nut, and the third part is a protruding post rigidly connected (e.g., integrally formed or welded) to the slider 21; in this embodiment, the slider 21 does not have a through hole 211, the middle portion of the protruding post is located at the original position of the through hole 211, and has both a fourth part extending from that position toward the fixing member 1, and a fifth part extending from that position away from the fixing member 1. The fourth and fifth parts are threaded.

[0055] In a further embodiment, refer to Figure 4 and Figure 5 The tensioning component 22 also includes a slider 223. After the headrest height adjustment mechanism is assembled, the slider 223 is fixed on the side wall of the sliding member 21 near the fixed member 1. The slider 223 passes through and is slidably connected to the second slide groove 12. The middle part of the slider 223 is located in the second slide groove 12. The slider 223 is provided with a through hole 2231. The fastener 221 passes through the through hole 2231, the through hole 211 and the second slide groove 12. Thus, the approach and distance between the first part (rotating member 223) and the second part (limiting part 2211) actually affect the friction of the slider 223 sliding in the second slide groove 12.

[0056] As mentioned above, the slider 223 increases the contact area between the sliding member 21 and the fixed member 1, resulting in more uniform force distribution between them. The slider 223 also reduces the local wear rate of the headrest height adjustment mechanism, extending its service life. Simultaneously, the slider 223 improves the smoothness of the fastener 221 sliding on the second groove 12. Furthermore, the slider 223 provides support and positioning for the fastener 221, preventing it from shifting during adjustment or sliding and ensuring the accuracy of the friction adjustment by the tensioning component 22.

[0057] In a preferred embodiment, refer to Figure 4 and Figure 5 The number of fasteners 221 and rotating parts 222 corresponds one-to-one. All fasteners 221 in the tensioning assembly 22 are linearly distributed from top to bottom in the second slide groove 12, and the rotating parts 222 are connected to the fasteners 221 one-to-one. The arrangement of multiple fasteners 221 and rotating parts 222 forms a multi-point friction adjustment mechanism, which makes the force between the sliding part 21 and the fixed part 1 more uniform, and can better cope with the wear problem during long-term use. Even if some parts are worn, other parts can still provide sufficient friction to ensure the stability of the overall headrest height adjustment mechanism.

[0058] In a further embodiment, refer to Figure 4 and Figure 5 The headrest height adjustment mechanism includes two second slide grooves 12 and two tensioning components 22. The two second slide grooves 12 are symmetrically arranged on the fixed component 1, and the two tensioning components 22 are respectively inserted through the two second slide grooves 12. A first slide groove 11 is located between the two second slide grooves 12. The two second slide grooves 12 are symmetrically distributed on both sides of the first slide groove 11, so that the force exerted by the two tensioning components 22 on the sliding member 21 is also symmetrically distributed, thereby balancing the force on the sliding member 21 and allowing for more precise control of the overall friction force during adjustment.

[0059] In a further embodiment, refer to Figure 4 and Figure 5The sliding component 2 further includes a sliding part 23; one end of the sliding part 23 is movably connected to the sliding member 21, and the other end is slidably connected to the first slide groove 11. In specific implementation, when the user lifts or presses down the headrest, the sliding member 21 moves up and down, causing the sliding part 23 to move up and down along the first slide groove 11. The sliding part 23 is set corresponding to the first slide groove 11, which is located between the two second slide grooves 12. This allows the force transmission point between the sliding part 23 and the sliding member 21 to form an approximately three-point balanced force state with the force transmission point of the tensioning components 22 on the sliding member 21 at the two second slide grooves 12. This effectively prevents the sliding member 21 from tilting or getting stuck due to force offset, ensuring that the sliding member 21 moves smoothly in the up and down direction. The two tensioning components 22 are located on both sides of the sliding part 23, and each tensioning component 22 includes at least two fasteners 221 and a rotating component 222. This facilitates all-round adjustment of the friction force of the sliding member 21 around the sliding part 23. It can be precisely adjusted according to the wear conditions at different positions around the sliding part 23, so that the friction force between the sliding member 21 and the fixed component 1 remains balanced overall.

[0060] In a further embodiment, refer to Figure 4 and Figure 5 The sliding part 23 includes: a first elastic member 231 and a locking block 232; one end of the first elastic member 231 is connected to the sliding member 21, and the other end is connected to the locking block 232, and can apply elastic force to the locking block 232 and the sliding member 21; the end of the locking block 232 away from the first elastic member 231 can slide into the inner sidewall of the first groove 11.

[0061] In a further embodiment, refer to Figure 4The inner sidewall of the first slide groove 11 is recessed with several locking grooves 111, and the width of the first slide groove 11 changes periodically in the vertical direction; the sliding member 21 can carry the locking block 232 into and out of different locking grooves 111 under the action of external force, and after the action of external force disappears, it is locked with a locking groove 111 by the first elastic member 231 and hovers relative to the fixed member 1. In practice, the headrest or sliding member 21 is pushed upwards to disengage the locking block 232 from the initial engagement slot 111. When the locking block 232 moves between the initial engagement slot 111 and its adjacent engagement slot 111, the inner wall of the first sliding groove 11 applies force to the locking block 232, causing the locking block 232 to press against the first elastic member 231, thus compressing the first elastic member 231. When the locking block 232 moves down to the next engagement slot 111, the force exerted on the locking block 232 near the inner wall of the first sliding groove 11 suddenly disappears due to the recessed design of the engagement slot 111. Consequently, under the action of the first elastic member 231 restoring its own elastic potential energy, the locking block 232 enters the engagement slot 111. If the external force is removed at this time, the locking block 232 engages with the first sliding groove 11, and the sliding member 2 is suspended at the corresponding height. If the external force continues, the locking block 232 will leave the slot 111 and repeat the above-mentioned action of entering and exiting different slots 111 until the external force is removed and the locking block 232 engages with a certain slot 111.

[0062] Understandably, based on the elastic element 231, the locking block 232 is always in contact with the inner wall of the first slide groove 11. As the sliding element 21 slides, the locking block 232 will slide along the inner wall of the first slide groove 11. When the sliding element 21 stops moving, the elastic force of the first elastic element 231 causes the locking block 232 to contact the inner wall, increasing the friction between the sliding element 21 and the fixed component 1.

[0063] In this embodiment, the distance between adjacent locking slots 111 is 2cm (understandably, this value can be flexibly adjusted). Each time the user slightly lifts the headrest, the locking block 232 moves to the previous locking slot 111. The spacing between adjacent locking slots 111 provides clear adjustment levels for the headrest height, allowing the user to more intuitively perceive the adjustment position. Understandably, the design of the locking slots 111, in addition to the frictional clamping provided by the tensioning component 22, adds mechanical positioning, further preventing accidental slippage of the headrest and improving the reliability of headrest adjustment and positioning.

[0064] Understandably, in possible embodiments, the locking block 232 is configured to always engage with the snap-fit ​​groove 111 by means of the first elastic member 231. Understandably, in possible embodiments, when the first elastic member 231 is at its original length, the locking block 232 can be configured to precisely engage with the snap-fit ​​groove 111.

[0065] In a further embodiment, refer to Figure 4An arc-shaped protrusion 112 is provided between adjacent locking slots 111. The locking slots 111 are arc-shaped, and the locking slots 111 and the arc-shaped protrusions 112 form a wave-shaped guide rail 113. The locking block 232 slides against the guide rail 113. When the slider 21 moves, the locking block 232 slides along the wave-shaped guide rail 113 under the action of the first elastic member 231. When it passes the arc-shaped protrusion 112, the locking block 232 is squeezed by the protrusion, which compresses the first elastic member 231. When it slides to the locking slot 111, the first elastic member 231 returns to its original position, pushing the locking block 232 into the locking slot 111. The design of the wave-shaped guide rail 113 makes the locking block 232 slide more smoothly when sliding and switching gears, reduces jamming, and improves the user's adjustment feel.

[0066] In a preferred embodiment, refer to Figure 4 The shape of the locking block 232 is adapted to the groove shape of the locking slot 111. The matching of the locking block 232 and the locking slot 111 in shape ensures good contact between the locking block 232 and the locking slot 111, reduces the gap between the two, avoids shaking during the adjustment process, and makes the headrest more stable after positioning.

[0067] In a preferred embodiment, refer to Figure 4 The system comprises two first slide grooves 11 and two sliding parts 23. The two first slide grooves 11 are mirror images of each other between the two second slide grooves 12. Each of the two first slide grooves 11 has several engaging slots 111 on its adjacent sidewall. The two sliding parts 23 are mirror images of the two first slide grooves 11 and slide within each of the two first slide grooves 11. In practice, moving the slider 21 causes the two sliding parts 23 to slide synchronously within the two mirror images of the first slide grooves 11, with locking blocks 232 engaging with their corresponding engaging slots 111. The mirror image arrangement of the two first slide grooves 11 and the sliding parts 23 prevents the slider 21 from tilting or jamming due to unilateral force, further improving the overall stability and reliability of the headrest height adjustment mechanism.

[0068] In a further embodiment, refer to Figure 4 and Figure 5 The sliding member 21 is provided with a third sliding groove 212, and the locking block 232 is slidably connected to the third sliding groove 212. The first elastic member 231 is disposed between the inner wall of the third sliding groove 212 and the locking block 232. The third sliding groove 212 guides and restricts the movement of the locking block 232, providing a horizontal movement path for the locking block 232, so that the elastic force of the first elastic member 231 can be accurately applied to the locking block 232 and the inner wall of the first sliding groove 11, avoiding the locking block 232 from being deviated due to force and affecting the positioning effect.

[0069] In a preferred embodiment, refer to Figure 4 and Figure 5The extension directions of the third slide groove 212 and the first elastic member 231, as well as the extension direction of the first slide groove 11, are perpendicular to the arrangement direction of the sliding member 21 and the fixing member 1. The locking block 232 passes through the first slide groove 11. For example, the sliding member 21 and the fixing member 1 are arranged overlapping along the first direction, and the third slide groove 212 and the first elastic member 231 extend along the second direction, which is the arrangement direction of the first slide groove 11 and the second slide groove 12. The extension direction of the first slide groove 11 is the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. In this case, the first elastic member 231 drives the locking block 232 to abut against the wave-shaped guide rail 113 along the second direction. The locking block 232 passes through the first slide groove 11, so that the locking block 232 and the first slide groove 11 form a nested fit, preventing the sliding part 23 from disengaging from the fixing member 1 during sliding or positioning, thus ensuring the stability of the headrest height adjustment and positioning functions.

[0070] In a further embodiment, refer to Figure 5 and Figure 6 The fixing component 1 includes a fixing member 13 and a connecting member 14. A first sliding groove 11 and a second sliding groove 12 are provided on the fixing member 13. The connecting member 14 is fixedly connected to the side wall of the fixing member 13 away from the sliding member 21. The thickness of the connecting member 14 is greater than the thickness of the limiting part 2211. The connecting member 14 is used to fixally connect to the headrest plate of the seat back. The setting of the connecting member 14 enables the fixing component 1 to be firmly installed on the seat back. The thickness of the connecting member 14 is greater than the thickness of the limiting part 2211, providing sufficient installation space for the limiting part 2211, avoiding interference between the limiting part 2211 and the headrest plate, ensuring the service life of the components, and leaving sufficient space for the adjustment of the tensioning component 22, improving the reliability of the headrest height adjustment mechanism. In addition, the first sliding groove 11 and the second sliding groove 12 are concentrated on the fixing member 13, which facilitates processing and assembly and reduces production difficulty.

[0071] In a further embodiment, refer to Figure 7 The headrest height adjustment mechanism also includes: mounting component 3; mounting component 3 is used to connect the headrest, and mounting component 3 is detachably connected to the side of the sliding member 21 away from the fixed member 1.

[0072] In a further embodiment, when it is necessary to replace the headrest, adjust the tensioning component 22, or repair the sliding part 23, the mounting component 3 can be detached from the sliding member 21, so that both the mounting component 3 and the headrest are separated from the sliding member 21 (or sliding member 2), exposing the tensioning component 22 and the sliding part 23 on the sliding member 21, facilitating headrest replacement and adjustment and maintenance of the sliding member 2. When the headrest replacement, tensioning component 22 adjustment, or sliding part 23 repair is completed, the mounting component 3 can be reattached to the sliding member 21. Throughout the process, the sliding member 21 does not need to be moved, and the fixing component 1 does not need to be disassembled, reducing maintenance costs and difficulty, and not affecting the already adjusted headrest height, thus enhancing the practicality, flexibility, and user experience of the seating. To achieve the detachability of the mounting component 3, in a further embodiment, refer to... Figure 8 , Figure 9 and Figure 10 The mounting component 3 includes a mounting member 31 and a locking member 32. The mounting member 31 and the locking member 32 are parallel to each other, and the locking member 32 is slidably connected to the mounting member 31 and can slide relative to the mounting member 31. The mounting member 31 has a first through hole 311, and the locking member 32 has a second through hole 321. The center lines of the second through hole 321 and the first through hole 311 can be at different heights. When the center lines of the second through hole 321 and the first through hole 311 are at different heights, the second through hole 321 and the first through hole 311 are staggered. A portion of the locking member 32 located around the second through hole 321 blocks the first through hole 311, forming a blocking part. In other words, the second through hole 321 and the first through hole 311 partially overlap.

[0073] Correspondingly, a locking post 213 protrudes from the side of the sliding member 21 away from the fixed member 1. The inner diameters of the first through hole 311 and the second through hole 321 are larger than the outer diameter of the locking post 213. The locking post 213 is coaxially arranged with the first through hole 311, and a limiting groove 2131 is provided at the end of the locking post 213 away from the sliding member 21. After the seat is assembled, as... Figure 10 As shown, the locking pin 213 passes through the first through hole 311 and the second through hole 321, and the locking pin 213 and the locking member 32 are engaged at the limiting groove 2131 and the blocking part (that is, the blocking part is engaged in the limiting groove 2131).

[0074] More specifically, the locking pin 213 is configured to apply force to the blocking part after penetrating the first through hole 311 to remove the blocking part, and then extend into the second through hole 321; the locking member 32 is configured to move relative to the mounting member 31 to release itself from the locking pin 213 and separate from the sliding member 2. That is, when the mounting component 3 is not installed on the locking pin 213, the center line of the second through hole 321 is lower than the center line of the first through hole 311. During installation, the first through hole 311 is aligned with the locking pin 213. After the locking pin 213 passes through the first through hole 311, it passes into the second through hole 321 and touches the blocking part. The blocking part is lifted (or pushed open), and the locking member 32 is lifted, so that the locking pin 213 can continue to pass into the second through hole 321. When the locking pin 213 continues to move until the limiting groove 2131 is aligned with the blocking part, the blocking part will fall and be stuck in the limiting groove 2131, thereby restoring the locking member 32 to the state where the center line of the second through hole 321 is lower than the center line of the first through hole 311. In other words, after the locking member 32 slides relative to the mounting member 31, the center line of the second through hole 321 can return to a state lower than the center line of the first through hole 311. At this time, the limiting groove 2131 of the locking pin 213 engages with the blocking part (i.e., the inner wall of the second through hole 321), thereby fixing the mounting member 31 and the locking member 32 to the sliding member 2. Thus, it can be understood that for a design that "wraps the headrest around the mounting member 3 and connects to the mounting member 3, and there is no irremovable connection between the headrest and the sliding member 2 and the fixed member 1," when it is necessary to remove the mounting member 3 from the sliding member 2, force is applied to the headrest, causing the locking member 32 to slide relative to the mounting member 31 and the sliding member 2 until the limiting groove 2131 separates from the blocking part, the locking pin 213 and the locking member 32 are released from engagement, and the headrest with the mounting member 3 can be removed from the locking pin 213, allowing the mounting member 3 itself and the sliding member 2 to separate from the fixed member 1.

[0075] Understandably, in possible embodiments, after the blocking part is lifted, the center lines of the first through hole 311 and the second through hole 321 may momentarily be at the same height; this is determined by the relative dimensions of the first through hole 311 and the second through hole 321, the dimensions of each part of the locking pin 213, and the stroke of the locking member 32 that can move upward, and is also within the scope of flexible design that can be achieved by those skilled in the art.

[0076] In a further embodiment, refer to Figure 9 and Figure 10The mounting member 31 is provided with a limiting post 314, and the locking member 32 is provided with a guide hole 322. The limiting post 314 passes through the guide hole 322. The horizontal width of the end of the limiting post 314 away from the mounting member 31 is greater than the horizontal diameter of the guide hole 322, and it abuts against the edge of the guide hole 322 away from the sliding member 21. The guide hole 322 extends in the vertical direction and can slide up and down relative to the limiting post 314 to a certain extent. In related embodiments, the guide hole 322 and the limiting post 314 are used to form a connection point between the locking member 32 and the mounting member 31, and the friction between the guide hole 322 and the limiting post 314 is configured so that the two will not easily separate. This ensures that the mounting member 31 and the locking member 32 will not easily separate during the removal of the headrest. In addition, the guide hole 322 is also used to determine the stroke of the locking member 32 sliding up and down.

[0077] In this embodiment, reference is made to Figure 9 and Figure 10 There are four limiting posts 314 and four guide holes 322. The four limiting posts 314 are rectangularly distributed on the mounting component 31, and the four guide holes 322 are respectively set for the four limiting posts 314. In specific implementation, moving the headrest causes the locking component 32 to slide. During the sliding process of the locking component 32, the four guide holes 322 will slide synchronously relative to the four limiting posts 314, so that the locking component 32 is evenly stressed around its perimeter, and the movement is smooth, which greatly improves the structural stability and operation smoothness of the mounting component 3.

[0078] In a further embodiment, refer to Figure 10 The locking element 32 is located on the side of the mounting component 31 away from the sliding component 21. A support cylinder 312 protrudes from the side wall of the mounting component 31 closest to the sliding component 21. The support cylinder 312 is coaxially arranged with the first through hole 311. The support cylinder 312 has a hollow structure with open ends along its axis, communicating with the first through hole 311. When the mounting component 3 is connected to the sliding component 21, the locking pin 213 passes through the support cylinder 312, the first through hole 311, and the second through hole 321 in sequence, and then the mounting component 3 and the sliding component 2 engage. When the headrest is moved up and down, the locking pin 213 will drive the support cylinder 312, the mounting component 31, and the locking element 32 to move synchronously. The support cylinder 312 provides support, limitation, and protection for the locking pin 213, making the force on the locking pin 213 more even, reducing the headrest's swaying during use, and improving the stability of the connection between the mounting component 3 and the sliding component 21.

[0079] In this embodiment, reference is made to Figure 9 and Figure 10The device comprises two locking pins 213, two support cylinders 312, two first through holes 311, and two second through holes 321. The two locking pins 213 are arranged side-by-side symmetrically along the arrangement direction of the first sliding groove 11 and the second sliding groove 12. The two support cylinders 312 are coaxially arranged with the two locking pins 213, and the two first through holes 311 are respectively positioned corresponding to the two support cylinders 312. The two second through holes 321 are positioned lower than the first through holes 311. When the locking member 32 slides, the two second through holes 321 move simultaneously relative to the two first through holes 311, achieving synchronous locking or unlocking. During headrest adjustment, moving the headrest moves the mounting member 31, which in turn causes the mounting member 31 and the locking member 32 to move the two locking pins 213, resulting in the sliding member 21 moving up and down evenly under force, thus achieving headrest height adjustment. The symmetrically distributed structure of two locking pins 213, two support cylinders 312, two first through holes 311, and two second through holes 321 avoids tilting caused by unilateral force on the mounting component 3 and the sliding component 2.

[0080] In a preferred embodiment, refer to Figure 10 A pad 313 is provided at the end of the support cylinder 312 away from the locking member 32. The pad 313 acts as a buffer, preventing excessive local force on the sliding member 21 due to the collision of the support cylinder 312, thus avoiding wear or deformation. It also reduces the collision and noise between the mounting component 3 and the sliding member 21 during use, thereby improving the durability and comfort of the headrest height adjustment mechanism.

[0081] In a further embodiment, the aforementioned "applying force to the headrest" specifically refers to applying force to the lower middle part of the headrest. Specifically, refer to... Figures 10 to 13The mounting member 31 has a groove 315 at the lower center position that is concave relative to the periphery, and a protruding post 316 protrudes downward from the bottom of the groove 315. The locking member 32 includes a locking member body 324 and a bent portion 323 extending from the locking member body 324 toward the mounting member 31. The bent portion 323 extends into the groove 315 and extends to the lower side of the protruding post 316, forming a slidable connection between the mounting member 31 and the locking member 32. A second elastic member 33 is provided between the bent portion 323 and the groove 315. One end of the second elastic member 33 is engaged with the protruding post 316, and the other end is in contact with the bent portion 323. When the locking member 32 slides relative to the mounting member 31, the length of the second elastic member 33 adapts to the change. The second elastic member 33 is used to reset the locking member 32 after it has slid relative to the mounting member 31. When it is necessary to release the locking member 32 from the locking post 213, the center position of the bottom of the headrest causes the locking member 32 to move upward, and the bent part 323 will move with the locking member 32, causing the second elastic member 33 to be compressed. After the blocking part is disengaged from the limiting groove 2131, the headrest and the mounting part 3 can be removed from the locking post 213. Then the second elastic member 33 returns to its original position with the mounting part 31 due to the removal of external force. Similarly, when installing the headrest, align the support cylinder 312 with the locking pin 213 and move the mounting piece 31 towards the sliding piece 21. This allows the locking pin 213 to be inserted into the support cylinder 312, the first through hole 311, and the second through hole 321. This causes the blocking part (or the edge of the second through hole 321) to be lifted by force. Subsequently, when the edge of the second through hole 321 moves above the limiting groove 2131, under the action of gravity and the elasticity of the second elastic member 33, the edge of the second through hole 321 will be engaged in the limiting groove 2131, and the locking member 32 and the locking pin 213 will be re-engaged.

[0082] In a preferred embodiment, refer to Figure 13 The number of second elastic elements 33 is at least two, and all second elastic elements 33 are linearly distributed along the arrangement direction of the first slide groove 11 and the second slide groove 12. The linear distribution of multiple second elastic elements 33 provides a more uniform and stable rebound force for the locking element 32, and also enhances the durability of the elastic force. Even if one second elastic element 33 experiences a slight failure, the other second elastic elements 33 can still guarantee basic functionality, extending the service life of the mounting component 3. In a possible embodiment, the end of the second elastic element 33 away from the protrusion 316 can be welded to the bending portion 323.

[0083] Understandably, the above-mentioned method of locking and unlocking by changing the relative positions of the first through hole 311 and the second through hole 321 through the sliding locking member 32 is simple and intuitive to operate, can quickly fix and disassemble the installation component 3, and the unlocking process is convenient and labor-saving, without the need for tools, which improves the user experience. At the same time, the structure is simple and low in cost, making it suitable for mass production and widespread use.

[0084] In this embodiment, reference is made to Figure 8 The locking component 32, mounting component 31, sliding component 21, fixing component 13, and connecting component 14 are all plate-shaped components. Plate-shaped components allow for a higher degree of fit between components, a larger contact area, and more uniform force distribution, effectively improving the stability and load-bearing capacity of the overall structure. The manufacturing process of plate-shaped components is relatively simple, reducing production difficulty and cost. The regular shape of plate-shaped components makes positioning and connection more convenient, reducing assembly errors and effectively saving space. This makes the overall structure of the headrest height adjustment mechanism more compact, suitable for use in scenarios with high space requirements, such as aircraft seats and car seats.

[0085] Example 2

[0086] Reference Figure 1 This utility model provides a seat (not shown, the seat is a seat with the headrest height adjustment mechanism of Embodiment 1 installed), including the headrest height adjustment mechanism of Embodiment 1.

[0087] In a further embodiment, the seating in this embodiment also includes: a backrest, a headrest board, and a headrest; the headrest board is fixedly connected to the backrest, the fixing component 1 is fixedly connected to the headrest board, and the headrest is wrapped around the mounting component 3.

[0088] It is understood that the seating can be various types of seating, such as airplane seats, car seats, office chairs, massage chairs, and sofas. The seating in this embodiment is equipped with the headrest height adjustment mechanism of Embodiment 1, which reduces the need for complete replacement of the seating due to headrest issues, lowers the maintenance cost of the seating, and is especially suitable for scenarios where disassembly of seating is difficult, such as airplanes and automobiles, significantly improving the market competitiveness of the seating product.

[0089] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A headrest height adjustment mechanism, characterized in that, include: The fixed component is provided with a first sliding groove that extends vertically. A sliding component is used to mount a headrest and can slide up and down relative to the fixed component. The sliding component includes a tensioning assembly and a sliding member located on the side of the fixed component. The sliding member is connected to the first sliding groove and can slide up and down relative to the fixed component. The tensioning assembly, the sliding member, and the fixed component are connected, and a first part of the tensioning assembly is located on one side of the sliding member, and a second part is located on the opposite side of the sliding member. The first part and the second part can move closer to or further away from each other under the action of external force, thereby increasing or decreasing the clamping force of the tensioning assembly on the sliding member to adjust the friction between the sliding component and the fixed component during relative movement.

2. The headrest height adjustment mechanism according to claim 1, characterized in that, The fixing component is provided with a second sliding groove, the extension direction of the second sliding groove is parallel to the extension direction of the first sliding groove, and the tensioning component has a third part that passes through the second sliding groove, and the third part is connected to the sliding member in a transmission manner.

3. The headrest height adjustment mechanism according to claim 2, characterized in that, The fastening assembly further includes a fastener and a rotating member that is the first part; the sliding member has a through hole, and a portion of the second sliding groove communicates with the through hole; the fastener passes through the second sliding groove and the through hole, and the portion of the fastener that passes through the second sliding groove belongs to the third part; one end of the fastener has a limiting portion that is the second part; the rotating member is screwed to the end of the fastener away from the limiting portion.

4. The headrest height adjustment mechanism according to claim 3, characterized in that, The tensioning assembly further includes: a slider; the slider is fixedly connected to the side wall of the sliding member near the fixed member, the slider passes through and is slidably connected to the second slide groove, the slider is provided with a through hole, and the fastener passes through the through hole, the through hole and the second slide groove; the proximity and distance between the first part and the second part are used to affect the friction force of the slider sliding in the second slide groove.

5. The headrest height adjustment mechanism according to claim 2, characterized in that, The number of the second slide grooves corresponds one-to-one with the number of the tensioning components; the headrest height adjustment mechanism includes two second slide grooves and two tensioning components; the two tensioning components are respectively inserted into the two second slide grooves; the first slide groove is located between the two second slide grooves.

6. The headrest height adjustment mechanism according to claim 5 or 1, characterized in that, The sliding component further includes a sliding part; one end of the sliding part is movably connected to the sliding member, and the other end is slidably connected to the first sliding groove.

7. The headrest height adjustment mechanism according to claim 6, characterized in that, The sliding part includes: a first elastic element and a locking block; one end of the first elastic element is connected to the sliding element, and the other end is connected to the locking block, and can apply an elastic force to the locking block and the sliding element; the end of the locking block away from the first elastic element is engaged with the inner sidewall of the first sliding groove; the sliding element is provided with a third sliding groove, the locking block is slidably connected to the third sliding groove, and the first elastic element is disposed between the inner wall of the third sliding groove and the locking block.

8. The headrest height adjustment mechanism according to claim 7, characterized in that, The inner sidewall of the first slide groove is recessed with a plurality of locking grooves, which are linearly distributed from top to bottom in the first slide groove, and the width of the first slide groove changes periodically in the vertical direction; the sliding member can carry the locking block into and out of different locking grooves under the action of external force, and after the action of external force disappears, it engages with a locking groove by the first elastic member and is suspended relative to the fixed member.

9. The headrest height adjustment mechanism according to claim 1, characterized in that, Also includes: Mounting component; the mounting component is used to connect the headrest, and the mounting component is detachably connected to the side of the slider away from the fixed component.

10. The headrest height adjustment mechanism according to claim 9, characterized in that, The mounting component includes: a mounting member and a locking member; the locking member is slidably connected to the mounting member and can slide relative to the mounting member; the mounting member has a first through hole, and the locking member has a second through hole, the center lines of the second through hole and the first through hole can be at different heights; when the center lines of the second through hole and the first through hole are at different heights, the second through hole and the first through hole are staggered, and a portion of the locking member located on the periphery of the second through hole blocks the first through hole, forming a blocking part; The sliding member has a protruding locking post on the side away from the fixed component. The locking post is coaxially arranged with the first through hole. The end of the locking post away from the sliding member has a limiting groove. The locking post passes through the first through hole and the second through hole. The limiting groove and the blocking part are engaged, so that the locking post and the locking component are engaged. The locking pin is configured to apply force to the blocking part after penetrating the first through hole to remove the blocking part, and then extend into the second through hole; the locking member is configured to move relative to the mounting member to release itself from the locking pin and separate from the sliding member.

11. The headrest height adjustment mechanism according to claim 10, characterized in that, The lower part of the mounting component is provided with a groove that is concave to the periphery, and a protruding post extends downward from the bottom of the groove. The locking member includes a locking member body and a bent portion extending from the locking member body toward the mounting member; the bent portion extends into the groove and to the lower side of the protrusion, forming a slidable connection between the mounting member and the locking member; a second elastic member is provided between the bent portion and the groove, one end of the second elastic member engaging with the protrusion and the other end contacting the bent portion; the length of the second elastic member adapts to the sliding of the locking member relative to the mounting member; the second elastic member is used to reset the locking member after it has slid relative to the mounting member.

12. The headrest height adjustment mechanism according to claim 11, characterized in that, The mounting component is provided with a limiting post, and the locking component is provided with a guide hole, through which the limiting post passes; the guide hole can slide relative to the limiting post, and the guide hole and the limiting post are used to form a connection point between the locking component and the mounting component.

13. A seating arrangement, characterized in that, Includes the headrest height adjustment mechanism as described in any one of claims 1-12, and the headrest.

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