Automobile seat with headrest extraction recognition function

Abstract

The utility model relates to the technical field of automobile seat, disclose a kind of automobile seat with headrest pull-out identification function, it includes: backrest;Guide sleeve assembly, including guide sleeve, unlocking button and elastic part, first conductor and second conductor are equipped on guide sleeve;Unlocking button is equipped with conduction structure;Elastic part makes conduction structure have the tendency to move to the side close to first conductor and second conductor;Headrest is equipped with headrest guide rod;After headrest guide rod is inserted into guide sleeve, headrest guide rod pushes unlocking button, makes conduction structure and at least one of first conductor and second conductor separate;After headrest guide rod is pulled out from guide sleeve, elastic part drives unlocking button, makes conduction structure both first conductor and second conductor conduction, to identify headrest.The utility model is characterized in that, automobile seat with headrest pull-out identification function, it does not need to be equipped with through hole or through slot on the side of metal sleeve and plastic guide sleeve, has no influence to the whipping of automobile seat, high in strength, and good in versatility and economy.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to an automotive seat with a headrest removal recognition function. Background Technology

[0002] Car seats are becoming increasingly versatile, with many models featuring a one-touch bed conversion function. This function allows passengers to lie down by reclining the front seatbacks, creating a seamless connection between the backrests and the rear seat cushions. This process typically requires removing the front seat headrests first to allow the front seatbacks to connect with the rear seat cushions. However, during normal use, car seat headrests provide crucial protection for passengers' heads and necks. Therefore, after disabling the one-touch bed conversion and restoring the front seatbacks to a seated position, it's essential to ensure the headrests are reattached to the front seatbacks.

[0003] When the one-touch bed function is activated, if the front seat headrests are not removed, they may be pressed against the rear seat cushions, posing a risk of damage. After the front seats are reset from the one-touch bed mode, if the headrests are not promptly reinstalled, the occupants' heads and necks will be unprotected. In the event of a collision, without the cushioning and support of headrests, the occupants' heads and necks are more likely to suffer injury, potentially even life-threatening.

[0004] In some existing car seats, a detection device is used to identify whether a headrest is installed on the backrest. This is achieved by creating through holes or slots in the plastic guide sleeve for mounting the headrest guide rod, and correspondingly creating through holes or slots in the metal sleeve on the backrest frame for mounting the plastic guide sleeve. A probe is placed in the through hole or slot to detect whether a headrest is installed. When a headrest is installed, the metal guide rod is inserted into the plastic guide sleeve and will be detected by the probe. However, creating holes or slots in the plastic guide sleeve and the metal sleeve can severely affect the whiplash test score of the car seat, easily causing it to fail the whiplash test. Furthermore, configuring this function requires developing new molds for the metal sleeve on the backrest frame, as existing molds are not applicable, resulting in poor versatility and economy. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a car seat with headrest pull-out recognition function that has no impact on whipping scores, high strength, good versatility, and no impact on whipping scores.

[0006] The technical solution adopted by this utility model to solve its technical problem is to propose a car seat with headrest removal recognition function, comprising:

[0007] Backrest, the backrest including a backrest frame;

[0008] A guide sleeve assembly, disposed on the backrest frame, includes a guide sleeve, an unlock button, and an elastic element. The guide sleeve is disposed on the backrest frame and has a first conductor and a second conductor arranged at intervals on the guide sleeve. The unlock button is movably disposed on the guide sleeve and has a conductive structure. The elastic element is disposed between the guide sleeve and the unlock button, and the force exerted by the elastic element on the unlock button causes the conductive structure to tend to move closer to the first conductor and the second conductor.

[0009] The headrest is equipped with a headrest guide rod;

[0010] After the headrest guide rod is inserted into the guide sleeve, the headrest guide rod pushes against the unlock button, causing the conductive structure to separate from at least one of the first conductor and the second conductor; after the headrest guide rod is pulled out of the guide sleeve, the elastic element drives the unlock button, causing the conductive structure to conduct the first conductor and the second conductor to identify the headrest.

[0011] Furthermore, the guide sleeve assembly also includes a mounting base, which is mounted on the backrest frame, and the mounting base is respectively provided with a first mating plug and a second mating plug;

[0012] The first conductor is detachably connected to the first mating plug, and the second conductor is detachably connected to the second mating plug.

[0013] Furthermore, the first conductor and the second conductor are configured as male terminals, and the first mating plug and the second mating plug are configured as female terminals.

[0014] Furthermore, it also includes a controller, with the first and second docking plugs electrically connected to the controller respectively; the controller identifies the presence or absence of the headrest based on the continuity or disconnection between the first and second conductors.

[0015] Furthermore, the car seat is equipped with a sleeping mode, and when the car seat is switched to the sleeping mode, the backrest of the car seat reclines backward;

[0016] When the headrest is not removed from the backrest, the first conductor and the second conductor are disconnected, and the car seat cannot be switched to the sleeping mode.

[0017] Furthermore, it also includes alarms;

[0018] When the car seat is in bed mode and the headrest is not removed from the backrest, the alarm sounds, prompting the headrest to be removed.

[0019] When the car seat is out of the sleeping mode and the headrest is not installed on the backrest, the alarm sounds to prompt the installation of the headrest.

[0020] Furthermore, a sleeve is provided on the backrest frame, the mounting base is installed on the sleeve, and the guide sleeve passes through the sleeve from top to bottom to connect the male terminal to the female terminal.

[0021] Furthermore, the sleeve is made of metal, the guide sleeve is made of plastic, and the mounting base is made of plastic;

[0022] The male terminal is embedded in the guide sleeve and is integrally formed with the guide sleeve; the female terminal is embedded in the mounting base and is integrally formed with the mounting base.

[0023] Furthermore, the top of the guide sleeve has a boss, and the boss has a mounting cavity, in which the unlocking button is retractably and movably disposed;

[0024] The conductive structure is configured as a conductive contact piece, which is embedded in the unlock button; the unlock button has a through hole through which the headrest guide rod can pass.

[0025] Furthermore, the headrest guide rod can be raised and lowered within the guide sleeve to adjust the height of the headrest;

[0026] The headrest guide rod is provided with multiple locking grooves along its axial direction. The unlocking button is provided with a locking part, which can be locked into the locking groove to lock the headrest guide rod.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] In this invention, a first conductor and a second conductor are spaced apart within the guide sleeve. The unlocking button has a conductive structure for connecting the first and second conductors. When the headrest guide rod is inserted into the guide sleeve, it pushes against the unlocking button, causing it to move away from the first and second conductors. At this time, the conductive structure does not connect the first and second conductors, thus not forming a circuit. The controller can determine that the headrest has been installed. If the headrest is removed, i.e., the headrest guide rod is pulled out of the guide sleeve, it no longer pushes against the unlocking button. Under the action of the elastic element, the unlocking button moves closer to the first and second conductors, and the conductive structure connects them. The controller can determine that the headrest has been removed, and the car seat can then switch to a sleeping mode, ensuring that the headrest is not forgotten and the rear seats are not compressed. Notably, there is no need to create through holes or slots on the side of the guide sleeve or the side of the metal sleeve to accommodate the probe, ensuring the overall strength of the headrest and preventing any impact on its whiplash score. Furthermore, when upgrading, only the old plastic guide sleeve needs to be replaced, and the mold used to form the metal sleeve does not need to be redeveloped, which is versatile and economical.

[0029] In this utility model, the guide sleeve assembly also includes a mounting base, which is fixed on the metal sleeve of the backrest frame. The mounting base is provided with a first mating plug and a second mating plug, wherein the two mating plugs are female terminals, and the first conductor and the second conductor are male terminals. The guide sleeve connects with the two female terminals of the mounting base through the two male terminals to achieve connection with the controller. This connection method can ensure that the conductive assembly is easy to install.

[0030] In this invention, the controller determines whether the headrest has been removed based on whether the conductive contact piece connects the first and second conductors. This reduces the risk of misjudgment. Furthermore, if the headrest is removed and the car seat returns from the sleeping position to the designed position, the alarm will sound to remind the user to install the headrest, thus ensuring the safety of passengers sitting in the car seat. Attached Figure Description

[0031] Figure 1 This is a partial structural diagram of the car seat with headrest pull-out recognition function according to this utility model;

[0032] Figure 2 for Figure 1 Exploded view;

[0033] Figure 3 for Figure 2 A structural diagram from another perspective;

[0034] Figure 4 This is a schematic diagram of the guide sleeve assembly;

[0035] Figure 5 for Figure 4Exploded view;

[0036] Figure 6 This is an exploded view of the guide sleeve and mounting base;

[0037] Figure 7 for Figure 6 A structural diagram from another perspective;

[0038] Figure 8 This is a plan view of the guide sleeve assembly;

[0039] Figure 9 for Figure 8 Sectional view along the middle AA.

[0040] In the picture:

[0041] 1. Backrest; 10. Backrest frame; 100. Sleeve;

[0042] 2. Guide sleeve assembly; 20. Guide sleeve; 21. Unlock button; 22. Elastic element; 23. Mounting base; 201. First conductor; 202. Second conductor; 203. Boss; 203A. Mounting cavity; 210. Conductive structure; 211. Through hole; 212. Locking part; 231. First mating plug; 232. Second mating connector;

[0043] 3. Headrest; 30. Headrest guide rod; 301. Locking groove. Detailed Implementation

[0044] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0045] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0046] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0049] like Figures 1-9As shown, a car seat with headrest removal recognition function according to this embodiment mainly includes: a backrest 1, a guide sleeve assembly 2, and a headrest 3. The backrest 1 includes a backrest frame 10, which is made of metal. The guide sleeve assembly 2 is disposed on the backrest frame 10 and includes a guide sleeve 20, an unlock button 21, and an elastic member 22. The guide sleeve 20 is disposed on the backrest frame 10 and has a first conductor 201 and a second conductor 202 arranged at intervals. The unlock button 21 is movably disposed on the guide sleeve 20 and has a conductive structure 210 for connecting the first conductor 201 and the second conductor 202. The elastic member 22 is disposed between the guide sleeve 20 and the unlock button 21, and the force exerted by the elastic member 22 on the unlock button 21 causes the conductive structure 210 to tend to move towards the first conductor 201 and the second conductor 202. The headrest 3 is provided with a headrest guide rod 30. In actual use, when the headrest guide rod 30 is inserted into the guide sleeve 20, the headrest guide rod 30 pushes the unlock button 21, causing the conductive structure 210 to separate from at least one of the first conductor 201 and the second conductor 202. Preferably, the conductive structure 210 is separated from both the first conductor 201 and the second conductor 202, so that the first conductor 201 and the second conductor 202 are not conductive. Of course, it is also possible for the conductive structure 210 to separate from one of the first conductor 201 and the second conductor 202, which will also cause the first conductor 201 and the second conductor 202 to be non-conductive. That is, when the first conductor 201 and the second conductor 202 are not conductive, it indicates that the headrest 3 is in the installed state. When the headrest guide rod 30 is pulled out of the guide sleeve 20, the elastic element 22 drives the unlock button 21, causing the conductive structure 210 to move closer to both the first conductor 201 and the second conductor 202. The conductive structure 210 connects the first conductor 201 and the second conductor 202. At this time, the first conductor 201 and the second conductor 202 are in a conductive state, which means that the headrest 3 is in the pulled-out state.

[0050] In this embodiment, a first conductor 201 and a second conductor 202 are spaced apart in the guide sleeve 20. The unlock button 21 is provided with a conduction structure 210 for connecting the first conductor 201 and the second conductor 202. When the headrest guide rod 30 is inserted into the guide sleeve 20, the headrest guide rod 30 pushes against the unlock button 21, causing it to move away from the first conductor 201 and the second conductor 202. At this time, the conduction structure 210 will not connect the first conductor 201 and the second conductor 202, and no circuit will be formed. The controller can determine that the headrest 3 has been installed based on this. If the headrest 3 is removed, i.e., the headrest guide rod 30 is pulled out of the guide sleeve 20, the headrest guide rod 30 no longer pushes against the unlock button 21. Under the action of the elastic element 22, the unlock button 21 moves closer to the first conductor 201 and the second conductor 202. The conducting structure 210 connects the first conductor 201 and the second conductor 202. The controller can then determine that the headrest 3 has been removed. At this time, the car seat can switch to the sleeping mode, ensuring that the headrest 3 is not forgotten and the rear seat is not compressed. Notably, there is no need to create through holes 211 or through slots on the side of the guide sleeve 20 and the side of the metal sleeve 100 to accommodate the probe, thus ensuring the overall strength of the headrest 3 and preventing any impact on its whiplash score. Furthermore, during upgrades, only the old plastic guide sleeve 20 needs to be replaced; the mold used to form the metal sleeve 100 does not need to be redeveloped, resulting in good versatility and cost-effectiveness.

[0051] Furthermore, in this embodiment, the guide sleeve assembly 2 also includes a mounting base 23, which is mounted on the backrest frame 10. Specifically, a metal sleeve 100 is provided on the backrest frame 10, and the mounting base 23 is fixedly mounted on the metal sleeve 100. The mounting base 23 is provided with a first mating plug 231 and a second mating plug; the first conductor 201 is detachably connected to the first mating plug 231, and the second conductor 202 is detachably connected to the second mating plug. In the actual assembly process, both the first conductor 201 and the second conductor 202 ultimately need to be electrically connected to the controller. If the first conductor 201 and the second conductor 202 are directly connected to the controller via wires, the assembly process would be very inconvenient.

[0052] In this application, the mounting base 23 can be first installed on the metal sleeve 100 of the backrest frame 10. The two mating plugs of the metal sleeve 100 are electrically connected to the controller through wires. During the assembly process, the guide sleeve 20 is simply inserted into the metal sleeve 100, and the first conductor 201 and the second conductor 202 on the guide sleeve 20 are respectively connected to the first mating plug 231 and the second mating plug, which is convenient for assembly.

[0053] In this design, the first conductor 201 and the second conductor 202 are configured as male terminals, and the first mating plug 231 and the second mating plug are configured as female terminals. When the guide sleeve 20 is inserted into the metal sleeve 100 from top to bottom, the male terminals are inserted into the female terminals. The male terminals on the guide sleeve 20 are inserted into the female terminals on the mounting base 23, making the connection more convenient and reducing assembly difficulty.

[0054] To facilitate the control of various functions of the car seat, the car seat in this embodiment also includes a controller. The first docking plug 231 and the second docking plug (i.e., two female terminals) are electrically connected to the controller. In actual use, the controller identifies whether there is a headrest 3 based on the continuity or disconnection between the first conductor 201 and the second conductor 202. When the first conductor 201 and the second conductor 202 are connected, the controller determines that there is no headrest 3 on the backrest 1. When the first conductor 201 and the second conductor 202 are disconnected, the controller determines that there is a headrest 3 on the backrest 1.

[0055] Specifically, the sleeve 100 is made of metal, the guide sleeve 20 is made of plastic, and the mounting base 23 is made of plastic. Furthermore, the male terminal is embedded in the guide sleeve 20 and integrally injection molded with it; that is, the male terminal is placed as an insert in the mold of the guide sleeve 20 and integrally injection molded with it, eliminating the need for additional fixation between the male terminal and the guide sleeve 20. Similarly, the female terminal is embedded in the mounting base 23 and integrally injection molded with it; also, the female terminal is placed as an insert in the mold of the mounting base 23 and integrally injection molded with it, eliminating the need for additional fixation between the female terminal and the mounting base 23.

[0056] In this embodiment, the car seat is equipped with a sleeping mode. When the car seat is switched to sleeping mode, the backrest 1 of the car seat reclines backward, and the backrest 1 is flush with the seat cushion of the rear car seat, thus realizing the sleeping mode. When the headrest 3 is not removed from the backrest 1, the first conductor 201 and the second conductor 202 are in a disconnected and non-conductive state, and the car seat cannot switch to sleeping mode. This ensures that the headrest 3 will not be forgotten and the backrest 1 will not be reclined, thus preventing the headrest 3 from pressing against the rear seat.

[0057] Preferably, the car seat in this embodiment also includes an alarm, which is electrically or communicatively connected to the controller, and is controlled by the controller. In actual use, when the headrest 3 is not removed from the backrest 1 and the car seat executes the bed mode command, the alarm sounds, prompting the user to remove the headrest 3. Only after the user removes the headrest 3 can the car seat be switched to bed mode. When the car seat exits bed mode and the headrest 3 is not installed on the backrest 1, the alarm sounds, prompting the user to install the headrest 3, ensuring the safety of passengers sitting in the car seat. This is because if the headrest 3 is not installed on the backrest 1 in time after the car seat returns to its designed position from bed mode, the occupant's head and neck will be unprotected. In the event of a collision, without the cushioning and support of the headrest 3, the occupant's head and neck are easily injured, potentially even endangering their life.

[0058] The guide sleeve 20 has a boss 203 on its top, and a mounting cavity 203A is provided on the boss 203. The side of the mounting cavity 203A is open for mounting the unlock button 21. The unlock button 21 is telescopically mounted in the mounting cavity 203A. The elastic element 22 is preferably a spring, which is also provided in the mounting cavity 203A. One end of the spring abuts against the unlock button 21, and the other end abuts against the guide sleeve 20. The conductive structure 210 on the guide sleeve 20 is set as a conductive contact, i.e., a metal conductive sheet. The conductive contact is embedded in the unlock button 21 and is integrally injection molded with the unlock button 21. The unlock button 21 has a through hole 211 through which the headrest guide rod 30 can pass.

[0059] The headrest guide rod 30 is height-adjustable within the guide sleeve 20 to adjust the height of the headrest 3. The headrest guide rod 30 has multiple locking grooves 301 arranged sequentially along its axial direction. The unlocking button 21 has a locking part 212 that locks into the locking grooves 301, locking the headrest guide rod 30. This means the unlocking button 21 retains the basic function of adjusting the headrest 3's height. When adjusting the headrest 3's height, the unlocking button 21 must be pressed first, disengaging it from the locking grooves 301 on the headrest guide rod 30 and unlocking the headrest 3. When the unlocking button 21 is pressed, its movement direction is away from the first conductor 201 and the second conductor 202. Therefore, the conductive structure 210, i.e., the conductive contact, will not connect the first conductor 201 and the second conductor 202.

[0060] The working principle of the car seat with headrest 3 removal recognition function in this embodiment is as follows:

[0061] When the car seat is in the designed position, the headrest 3 is installed on the backrest 1. The headrest 3 is inserted into the guide sleeve 20 through the headrest guide rod 30 for installation. At this time, the headrest guide rod 30 pushes against the unlock button 21, compresses the elastic element 22, and prevents the conductive structure 210 on the unlock button 21, i.e. the conductive contact, from conducting the first conductor 201 and the second conductor 202. The controller recognizes that the headrest 3 is in the installed state. If the sleeping mode is triggered at this time, the alarm will sound a voice alarm to remind the user to remove the headrest 3 first. When the headrest 3 is removed from the backrest 1, the headrest guide rod 30 is pulled out from the guide sleeve 20. The headrest guide rod 30 no longer pushes against the unlock button 21. Under the elastic force of the elastic element 22, the unlock button 21 moves closer to the first conductor 201 and the second conductor 202. The conductive structure 210 on the unlock button 21, i.e. the conductive contact piece, contacts the first conductor 201 and the second conductor 202, connecting the first conductor 201 and the second conductor 202. The controller recognizes that the headrest 3 is in the removed state. At this time, the user can switch the car seat to the bed mode with one button.

[0062] In this solution, the car seat with headrest 3 pull-out recognition function does not require through holes 211 or through slots to be opened on the side of the metal sleeve 100 and the plastic guide sleeve 20, which has no impact on the whiplash score of the car seat, has high strength, and is versatile and economical.

Claims

1. A car seat with headrest removal recognition function, characterized in that, include: Backrest, the backrest including a backrest frame; A guide sleeve assembly, disposed on the backrest frame, includes a guide sleeve, an unlock button, and an elastic element. The guide sleeve is disposed on the backrest frame and has a first conductor and a second conductor arranged at intervals on the guide sleeve. The unlock button is movably disposed on the guide sleeve and has a conductive structure. The elastic element is disposed between the guide sleeve and the unlock button, and the force exerted by the elastic element on the unlock button causes the conductive structure to tend to move closer to the first conductor and the second conductor. The headrest is equipped with a headrest guide rod; After the headrest guide rod is inserted into the guide sleeve, the headrest guide rod pushes against the unlock button, causing the conductive structure to separate from at least one of the first conductor and the second conductor; After the headrest guide rod is pulled out of the guide sleeve, the elastic element drives the unlock button, causing the conductive structure to connect the first conductor and the second conductor to identify the headrest.

2. The car seat with headrest removal recognition function according to claim 1, characterized in that, The guide sleeve assembly also includes a mounting base, which is mounted on the backrest frame, and the mounting base is respectively provided with a first mating plug and a second mating plug; The first conductor is detachably connected to the first mating plug, and the second conductor is detachably connected to the second mating plug.

3. The car seat with headrest removal recognition function according to claim 2, characterized in that, The first conductor and the second conductor are configured as male terminals, and the first mating plug and the second mating plug are configured as female terminals.

4. The car seat with headrest removal recognition function according to claim 2, characterized in that, It also includes a controller, with the first and second docking plugs electrically connected to the controller respectively; the controller identifies whether the headrest is present or not based on the continuity or disconnection between the first and second conductors.

5. The car seat with headrest removal recognition function according to claim 4, characterized in that, The car seat is equipped with a sleeping mode. When the car seat is switched to the sleeping mode, the backrest of the car seat reclines backward. When the headrest is not removed from the backrest, the first conductor and the second conductor are disconnected, and the car seat cannot be switched to the sleeping mode.

6. The car seat with headrest removal recognition function according to claim 5, characterized in that, It also includes alarms; When the car seat is in bed mode and the headrest is not removed from the backrest, the alarm sounds, prompting the headrest to be removed. When the car seat is out of the sleeping mode and the headrest is not installed on the backrest, the alarm sounds to prompt the installation of the headrest.

7. The car seat with headrest removal recognition function according to claim 3, characterized in that, A sleeve is provided on the backrest frame, the mounting base is installed on the sleeve, and the guide sleeve passes through the sleeve from top to bottom to insert the male terminal into the female terminal.

8. The car seat with headrest removal recognition function according to claim 7, characterized in that, The sleeve is made of metal, the guide sleeve is made of plastic, and the mounting base is made of plastic. The male terminal is embedded in the guide sleeve and is integrally formed with the guide sleeve; the female terminal is embedded in the mounting base and is integrally formed with the mounting base.

9. The car seat with headrest removal recognition function according to claim 1, characterized in that, The top of the guide sleeve has a boss, and the boss has a mounting cavity. The unlock button is retractably and movablely disposed in the mounting cavity. The conductive structure is configured as a conductive contact piece, which is embedded in the unlock button; the unlock button has a through hole through which the headrest guide rod can pass.

10. The car seat with headrest removal recognition function according to claim 1 or 9, characterized in that, The headrest guide rod can be raised and lowered within the guide sleeve to adjust the height of the headrest. The headrest guide rod is provided with multiple locking grooves along its axial direction. The unlocking button is provided with a locking part, which can be locked into the locking groove to lock the headrest guide rod.

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