Bidirectionally adjustable headrest mechanism

Abstract

A bidirectionally adjustable headrest mechanism, comprising a moving component (3), a fixed base (7), and a sliding block (8), wherein the fixed base is fixedly mounted on a seat backrest (100); one of the fixed base and the moving component is provided with a guide rail (71), and the other of the fixed base and the moving component is provided with a guide groove (31); the guide rail is mounted in the guide groove to achieve the movement of the moving component on the fixed base; the fixed base is further provided with an elongated slot (722), and the sliding block is located on the side of the fixed base away from the moving component, passes through the elongated slot and is then fixedly connected to the moving component; or the sliding block is located on the side of the fixed base close to the moving component and is fixedly connected to the moving component, and the fixed base is provided with, on the side surface thereof close to the moving component, a slide groove structure (710) extending parallel to the guide rail and the guide groove; and the sliding block is mounted in the slide groove structure to achieve the movement of the sliding block on the fixed base. According to the bidirectionally adjustable headrest mechanism, the moving component is connected to the fixed base by means of the sliding block, thereby achieving the effect of reinforcing and supplementing rigidity.

Description

Two-way adjustable headrest mechanism Technical Field

[0001] The present disclosure relates to a vehicle seat, and more particularly to a two-way adjustable headrest mechanism. Background Art

[0002] It is known that a headrest can be movably mounted on a seat back to provide head support for passengers of different heights as needed. If the seat back is not high enough, when the headrest is moved to the highest position, the rear structure of the headrest will be exposed, which is not very aesthetically pleasing.

[0003] In order to solve the above-mentioned unsightly problem in the prior art, the present disclosure provides a two-way adjustable headrest mechanism.

[0004] According to the two-way adjustable headrest mechanism disclosed in the present invention, it includes a moving part, a fixed base and a slider, wherein the fixed base is fixedly installed on the seat back, one of the fixed base and the moving part has a guide rail, and the other of the fixed base and the moving part has a guide groove, and the guide rail is installed in the guide groove to realize the movement of the moving part on the fixed base, wherein: the fixed base also has a long groove, the slider is located on the side of the fixed base away from the moving part and is fixedly connected to the moving part in a manner of passing through the long groove; or, the slider is located on the side of the fixed base close to the moving part and is fixedly connected to the moving part, and the fixed base is provided with a slide groove structure extending parallel to the guide rail and the guide groove on its side close to the moving part, and the slider is installed in the slide groove structure to realize the movement of the slider on the fixed base.

[0005] For example, when the headrest is in the high position, the slider can serve as an auxiliary support, in addition to the guide rails and guide slots, to help resist the fore-aft tilting force exerted on the headrest. This allows the guide rails to be designed to be shorter, increasing the adjustment range without affecting the aesthetics. When the slider is positioned on the side of the fixed base near the moving components, it only occupies the fore-aft space originally reserved for the slide rails and guide slots, while saving the fore-aft space reserved for the slider on the rear side of the fixed base. This makes the entire two-way adjustable headrest mechanism more compact in terms of fore-aft dimensions.

[0006] Preferably, the long groove is configured to extend longitudinally, and the fixed base further has a plurality of transversely extending locking grooves connected to the long groove; or, the slide groove structure is configured to extend longitudinally, and the slide groove structure further has a plurality of transversely extending locking grooves connected to the transverse gap of the slide groove structure, and the slider is fixedly connected to the moving part in a manner of passing through the transverse gap.

[0007] Preferably, when the slider is located on a side of the fixed base proximal to the moving component, the fixed base further comprises an elongated slot extending longitudinally, and the fixed base further comprises a plurality of transversely extending locking slots communicating with the elongated slot. Furthermore, the slide structure extends longitudinally, and the slide structure further comprises a plurality of transversely extending locking slots communicating with a transverse gap within the slide structure. The slider is fixedly connected to the moving component by passing through the transverse gap. The dual front and rear locking slots enable a more secure locking of the headrest.

[0008] Preferably, the long slot is configured to penetrate the fixing base front and back or not penetrate the fixing base.

[0009] Preferably, the two-way adjustable headrest mechanism also includes a locking member movably mounted on the moving component, and the locking member has a locking portion. As the moving component moves on the fixed base, the locking portion moves longitudinally in the long slot or in the transverse gap of the slide structure, and can move transversely relative to the moving component to enter the locking slot connected to the long slot or the locking slot connected to the transverse gap of the slide structure for locking.

[0010] The two-way adjustable headrest mechanism also includes a locking member movably mounted on the movable component. The locking member has a locking portion. As the movable component moves on the fixed base, the locking portion moves longitudinally within the transverse gap between the elongated slot and the slide structure, and can move transversely relative to the movable component to enter and lock within both the locking slot connected to the elongated slot and the locking slot connected to the transverse gap of the slide structure. The locking portion of the locking member can be simultaneously supported by both the front and rear locking slots, thereby achieving a more secure locking of the headrest.

[0011] Preferably, the two-way adjustable headrest mechanism further comprises a locking spring, wherein the locking spring acts on the locking member to keep the locking portion in the locking groove.

[0012] Preferably, the slider has a transverse groove, and the locking portion is inserted into the transverse groove and is movable in the transverse groove.

[0013] Preferably, the locking member comprises a steel wire, and the locking portion is configured to be bent into a U-shape perpendicular to an extending direction of the steel wire.

[0014] Preferably, the locking member includes a push plate and a locking piece that are fixedly connected, and the locking portion is configured as the locking piece that is arranged perpendicular to the moving direction of the push plate.

[0015] Preferably, the locking member includes a rotating shaft and a locking plate fixedly connected, and a cable connected to the rotating shaft, and the locking portion is configured as the locking plate that can rotate with the rotating shaft under the action of the cable.

[0016] Preferably, it is characterized in that the two-way adjustable headrest mechanism further comprises a button, and the button acts on the steel wire or the push plate or the pull cable so that the locking portion is disengaged from the locking groove to achieve unlocking.

[0017] Preferably, the two-way adjustable headrest mechanism further comprises a motor and a transmission nut, wherein the motor is fixedly mounted on the fixed base, and the transmission nut is fixedly mounted on the moving component and cooperates with the screw thread of the motor.

[0018] Preferably, the two-way adjustable headrest mechanism further comprises a lubricating strip arranged between the guide groove and the guide rail.

[0019] Preferably, a metal insert is provided in the fixing base, or a reinforcement is attached to the fixing base, or the fixing base is directly provided by a metal material or reinforced plastic.

[0020] Preferably, the chute structure comprises two lugs facing each other, and the slide block is at least partially in a chute defined by the lug and the fixed base. Here, the slide block not only can be guided when moving up and down in the chute, but also is defined and anti-overturning by the chute.

[0021] Preferably, one of the fixed base and the moving component has a guide rail on its left and right sides, and the other of the fixed base and the moving component has a guide groove on its left and right sides, respectively. The slide groove structure is disposed between the two guide rails or guide grooves. This achieves an optimized arrangement of the slide groove structure and the guide rails or guide grooves while sharing the same front and rear space.

[0022] According to the two-way adjustable headrest mechanism disclosed herein, the moving part is connected to the fixed base via a slider, which serves to strengthen and supplement rigidity. On the basis of ensuring the stroke, the longitudinal matching dimension of the relatively moving parts is reduced, thereby reducing the longitudinal dimension of the headrest opening. Even if the seat back shape is not high enough, when the headrest is moved to the highest position, the rear structure of the headrest can still be blocked by the seat back, achieving a better appearance. This is suitable for suspended headrests, which have a simple structure and low cost. Moreover, according to the two-way adjustable headrest mechanism disclosed herein, the headrest can be adjusted up and down by unlocking the button. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 illustrates the up and down movement of a two-way adjustable headrest mechanism according to a preferred embodiment of the first embodiment of the present disclosure.

[0024] FIG2 is an exploded view of FIG1 .

[0025] FIG3 is an exploded view of FIG1 from another perspective.

[0026] FIG. 4 shows the installation of the fixed base and the moving parts of FIG. 2 .

[0027] FIG. 5 is a cross-sectional view of FIG. 4 .

[0028] FIG. 6 illustrates the installation of the lubricating strip of FIG. 2 .

[0029] FIG. 7 is a cross-sectional view of FIG. 6 .

[0030] FIG. 8 shows the installation of the locking wire and the slider of FIG. 2 .

[0031] FIG. 9 illustrates the installation of the locking wire of FIG. 2 .

[0032] FIG10 is a cross-sectional view of FIG9 .

[0033] FIG. 11 is a schematic structural diagram of the slider in FIG. 2 .

[0034] FIG. 12 shows the installation of the button of FIG. 2 .

[0035] FIG. 13 shows the installation of the button of FIG. 2 from another perspective.

[0036] FIG. 14 shows the installation of the spring of FIG. 2 .

[0037] FIG15 shows the low position state of the two-way adjustable headrest mechanism.

[0038] FIG16 is a schematic diagram of a partial structure of FIG15.

[0039] FIG. 17 shows the unlocked state of the two-way adjustable headrest mechanism.

[0040] FIG18 is a schematic diagram of a partial structure of FIG17 .

[0041] FIG19 shows the high position state of the two-way adjustable headrest mechanism.

[0042] FIG20 is a schematic diagram of a partial structure of FIG18.

[0043] FIG. 21 illustrates the working principle of the two-way adjustable headrest mechanism according to the present disclosure.

[0044] FIG. 22 is an exploded view of a two-way adjustable headrest mechanism according to another preferred embodiment of the present disclosure.

[0045] FIG. 23 illustrates the installation of the push plate of FIG. 22 .

[0046] FIG. 24 illustrates the unlocking principle of FIG. 22 .

[0047] FIG25 is an assembly diagram of a two-way adjustable headrest mechanism according to another preferred embodiment of the present disclosure.

[0048] FIG. 26 illustrates the installation of the cable of FIG. 25 .

[0049] FIG. 27 illustrates the installation of the rotating shaft of FIG. 25 .

[0050] FIG. 28 illustrates the unlocking principle of FIG. 25 .

[0051] FIG29 is a schematic structural diagram of a two-way adjustable headrest mechanism according to another preferred embodiment of the present disclosure.

[0052] FIG30 is an exploded view of FIG29 .

[0053] FIG31 shows an exploded view of a two-way adjustable headrest mechanism according to a preferred embodiment of the second embodiment of the present disclosure, wherein a slider is provided on a side of the fixed base close to the moving component.

[0054] FIG. 32 shows an assembled view of FIG. 31 .

[0055] FIG. 33 shows the two-way adjustable headrest mechanism in FIG. 31 in an exploded view from another angle.

[0056] FIG. 34 shows the two-way adjustable headrest mechanism of FIG. 32 in a cross-sectional view.

[0057] FIG. 35 shows a first variation of the two-way adjustable headrest mechanism of FIG. 34 in a sectional view, wherein the slot on the fixing base is configured as a non-penetrating groove.

[0058] FIG. 36 shows a second variation of the two-way adjustable headrest mechanism of FIG. 34 in a cross-sectional view, wherein no groove is provided on the fixed base.

[0059] FIG. 37 shows in exploded view the fixed base and the reinforcement to be attached to the back side thereof. DETAILED DESCRIPTION

[0060] The preferred embodiments of the present disclosure are given below in conjunction with the accompanying drawings and described in detail.

[0061] As shown in FIG1 , the two-way adjustable headrest mechanism according to a preferred embodiment of the first embodiment of the present disclosure can be adjusted up and down between a high position in the left figure and a low position in the right figure.

[0062] With reference to Figures 2 and 3 , the two-way adjustable headrest mechanism according to this embodiment includes a front cover 1, a moving component 3, a fixed base 7, and a rear cover 10. The fixed base 7 is fixedly mounted on a seat back 100, and the moving component 3 is mounted on the fixed base 7 so as to be movable up and down. The front cover 1 is fixedly mounted on the front side of the moving component 3, and the rear cover 10 is fixedly mounted on the front cover 1 on the rear side of the moving component 3, thereby providing a headrest 200 that is movably mounted on the seat back 100. Specifically, as shown in Figures 4 and 5 , the fixed base 7 has a pair of guide rails 71 that can point away from each other, and the moving component 3 has a pair of guide slots 31 that can point toward each other. By installing the guide rails 71 into the guide slots 31, the moving component 3 can move up and down on the fixed base 7. Alternatively, the fixed base 7 can have a pair of guide slots 31, and the moving component 3 can have a pair of guide rails 71, which can also achieve up and down movement of the moving component 3 on the fixed base 7.

[0063] As shown in Figures 2 and 3, the two-way adjustable headrest mechanism according to this embodiment also includes two narrow lubricating strips 5 and four wide lubricating strips 6. As shown in Figures 6 and 7, the narrow lubricating strips 5 are arranged on the left and right sides of the guide rail 71, and the wide lubricating strips 6 are arranged on the front and rear sides of the guide rail 71. The narrow lubricating strips 5 and the wide lubricating strips 6 match the guide grooves 31 of the moving part 3 to improve the smoothness of the moving part 3 when it moves relative to the fixed base 7.

[0064] As shown in Figures 2 and 3, the two-way adjustable headrest mechanism according to this embodiment also includes a steel wire 2 that is mounted on a movable component 3 for left and right movement. As shown in Figure 8, the middle portion of the steel wire 2 has a U-shaped locking portion 21 that bends perpendicularly to the direction of its extension. The movable component 3 has a waist-shaped hole 32 through which the locking portion 21 extends from front to back. As shown in Figures 9 and 10, the movable component 3 is equipped with an undercut structure 34 to secure the steel wire 2 and prevent it from slipping out.

[0065] As shown in Figures 2 and 3, the two-way adjustable headrest mechanism according to this embodiment also includes a slider 8 fixedly mounted on the moving component 3 to increase the headrest's impact resistance and rigidity, particularly when the headrest is adjusted to the high position, to enhance its strength and rigidity against forward and backward tipping forces / torques. In this first embodiment, the slider 8 is located on the side of the fixed base 7 away from the moving component 3. As shown in Figure 8, the fixed base 7 has a slot 72 comprising a vertically extending elongated slot 722 and locking slots 721 extending laterally from the slot 722 at varying heights. The slider 8 includes a support post 81 extending forward and backward. The moving component 3 has a circular hole 33. The support post 81 passes through the elongated slot 722 and into the circular hole 33, where it is secured by a screw 9. As the moving component 3 moves on the fixed base 7, the locking portion 21 extending through the waist-shaped hole 32 moves up and down within the elongated slot 722 and can move laterally into the locking slot 721 for locking and unlocking. As shown in FIG11 , the slider 8 has a transverse groove 82, and the locking portion 21 extending through the groove 72 can move within the transverse groove 82. It should be understood that the transverse groove 82 can provide a certain support for the steel wire 2, and the provision of the transverse groove 82 does not affect the locking and unlocking functions achieved by the left and right movement of the steel wire 2.

[0066] As shown in Figures 2 and 3, the two-way adjustable headrest mechanism according to this embodiment further includes a return spring 11 and a button 12. The button 12 is press-fitted to the rear cover 10 via the return spring 11. As shown in Figure 12, the rear cover 10 has a countersunk hole 105, into which the button 12 is mounted. As shown in Figure 13, the button 12 has a pair of hooks 121, which are secured to a stepped surface 106 on the rear cover 10. The button 12 also has a pressing post 122, which passes through a through hole 107 and acts on a vertically folded section 22 of the steel wire 2. Specifically, the free end of the pressing post 122 has a groove, into which the vertically folded section 22 is positioned to prevent the steel wire 2 from slipping or falling out. Thus, pressing the button 12 can move the steel wire 2.

[0067] As shown in Figures 2 and 3, the two-way adjustable headrest mechanism according to this embodiment also includes a locking spring 13, which is mounted on the front cover 1 and provides a locking force to the steel wire 2, thereby retaining the locking portion 21 of the steel wire 2 within the locking groove 721. As shown in Figure 14, the front cover 1 is provided with a slot 101, the sidewalls of which have a pair of aligned openings, and the locking spring 13 is mounted within the slot 101. The steel wire 2 has a transverse fold 23, which is inserted into the slot 101 along the opening and contacts the locking spring 13, allowing the locking spring 13 to exert a force on the steel wire 2, retaining the locking portion 21 of the steel wire 2 within the locking groove 721.

[0068] Figures 15 and 16 illustrate the low-position state of the two-way adjustable headrest mechanism according to this embodiment, with the locking portion 21 of the steel wire 2 located in the locking groove 721 of the fixed base 7. As shown in Figures 17 and 18, the passenger presses the button 12 with an external force F, which pushes the steel wire 2, which in turn pushes the locking portion 21 out of the locking groove 721 and into the elongated groove 722, unlocking the headrest 200. As shown in Figures 19 and 20, the movable component 3 moves upward to the high-position state, and the button 12 is released. The steel wire 2, under the action of the locking spring 13, enters the locking groove 721 at the corresponding height, locking the headrest 200.

[0069] The following describes the technical effects of the slider 8 with reference to Figure 21. As shown in Figure 21, the rear cover 10 of the two-way adjustable headrest mechanism according to this embodiment has an opening 101 of height H for accommodating the moving component 3. Specifically, the guide groove 31 of the moving component 3 has a length of H, and the overlap between the fixed base 7 and the rear cover 10 is L, specifically, the length of the guide rail 71 of the fixed base 7 is L. This results in a travel distance HL for the headrest 200 relative to the fixed base 7. In the prior art, to ensure the rigidity of the moving component 3, the overlap L is often designed to be sufficiently large. To ensure a sufficiently large travel distance, the corresponding opening height H of the headrest rear cover 10 is also very large. Consequently, if the seat back 100 is not sufficiently high, the headrest opening 101, or its upper portion, will be exposed when the headrest 200 is moved to its highest position. The two-way adjustable headrest mechanism of this embodiment has a short overlap between the fixed base 7 and the rear cover 10. Therefore, even if the travel of the headrest 200 is sufficiently large, the size of the opening in the rear cover 10 is reduced. When the headrest 200 is in its highest position, the headrest opening 101 is not exposed, thus meeting the desired appearance. It should be understood that simply shortening the overlap L would result in an excessive overhang of the headrest, compromising the rigidity of the headrest 200. In this disclosure, the slider 8 connects the movable component 3 to the fixed base 7, thereby enhancing the rigidity. In other words, when the headrest 200 is in the high position (see Figures 19 and 21), since the upper part of the headrest extends upward further from the backrest 100, it usually requires firm support to prevent the headrest 200 from tipping forward or backward when it is subjected to a forward or backward overturning force. In this embodiment, the slider 8 that moves upward together with the headrest 200 and the guide rail 71 of the fixed base 7 that is now at a certain distance below the slider 8 can cooperate to jointly resist the forward and backward overturning force exerted on the headrest 200 (at this time, the upper slider 8 and the left and right guide rails 71 below can form a triangular stable support). Therefore, in theory, the guide rail 71 can be designed to be arbitrarily short (as long as it can achieve the guiding function) because it is no longer supported alone, and the guide rail 71 and the upper slider 8 can always cooperate to achieve stable support. At the same time, while maintaining the required adjustment travel, the short guide rail 71 allows for a correspondingly short guide slot 31 and headrest opening 101. This prevents the headrest opening 101 and the moving components 3 therein from moving above the backrest 100 and becoming exposed, thus affecting the aesthetics, when the headrest 200 is moved to its highest position. Furthermore, when the headrest 200 is in its lowest position, the short guide rail 71 remains within the short guide slot 31, preventing it from moving upward and potentially scraping against the backrest 100's rear cover 10. Furthermore, in this embodiment, a metal insert may be provided within the fixed base 7 to enhance its rigidity. Referring to FIG. 37 , a plate-shaped reinforcement 103 may be attached to the rear side of the fixed base 7, for example, by screws, substantially covering the entire fixed base 7. This plate-shaped reinforcement 103 may be made of a rigid material such as metal or (fiber) reinforced plastic.Reinforcement grooves 104 may be provided on the reinforcement member 103 corresponding to the grooves 72 or the long grooves 722 and the locking grooves 721 to reinforce the long grooves 722 and the locking grooves 721. In fact, the fixed base 7 may also be directly provided by metal materials such as cast aluminum or hard materials such as reinforced plastics to ensure its rigidity.

[0070] As shown in Figures 22 and 23, the steel wire 2 of the two-way adjustable headrest mechanism of the present disclosure is replaced with a push plate 16 and a locking plate 19. The locking plate 19, acting as a locking portion, is perpendicular to the direction of movement of the push plate 16 and can be insert-molded or fixedly assembled with the push plate 16. Specifically, the push plate 16 is provided with a hook 161, and the moving component 17 has a slot 171, into which the hook 161 fits. As shown in Figure 24, pushing the button 12 causes the push plate 16 to move, which in turn causes the locking plate 19 to disengage from the locking slot 721, thereby unlocking the headrest.

[0071] As shown in FIG25 , the steel wire 2 of the two-way adjustable headrest mechanism according to the present disclosure is replaced by a rotating shaft 18, a locking plate 19, and a cable 21. The locking plate 19 serves as a locking portion and is insert-molded or fixedly assembled with the rotating shaft 18. The ends of the cable 21 are respectively connected to the rotating shaft 18 and the button 22. As shown in FIG26 , the cable 21 has a first end 211 and a second end 212. The rotating shaft 18 is provided with a hole 181 at a position offset from the axis, and the button 22 has a hole 221. The first end 211 of the cable 21 is connected to the hole 181 of the rotating shaft 18, and the second end 212 is connected to the hole 221 of the button 22. As shown in FIG27 , the rotating shaft 18 has two opposite ends 182 and 183. The moving component 20 has a hook 201 and a hole 202. The ends 182 and 183 are respectively connected and mounted to the hook 201 and the hole 202. As shown in FIG28 , by pressing the button 22 , the cable 21 moves, pulling the shaft 18 to rotate, driving the locking plate 19 to rotate, disengaging from the locking groove 721 , thereby unlocking the lock.

[0072] As shown in Figures 29 and 30 , the two-way adjustable headrest mechanism disclosed herein can be electrically adjusted. A fixed tab 23, which extends horizontally and is fixed to the fixed base 7, has two mounting holes 231. Screws 25 pass through these holes and lock the motor 24. The motor 24 includes a screw 241. The rotation of the screw 241 drives a drive nut 26 in the direction of the screw. The drive nut 26 is connected to the moving part 3 via screws 9, thereby driving the moving part 3 in the direction of the screw. It should be understood that the moving part 3 can be locked by the self-locking nature of the motor 24. Therefore, the locking groove 721 and the locking portion can be omitted in this embodiment.

[0073] Figures 31 to 34 schematically illustrate a two-way adjustable headrest mechanism according to a preferred embodiment of the second embodiment of the present disclosure. In this second embodiment, a slider 8 fixedly mounted on the moving part 3 is also provided to increase its strength and rigidity against the front and rear overturning force / torque when the headrest 200 is adjusted to a high position. Unlike the first embodiment, in this second embodiment, the slider 8 is located on the side of the fixed base 7 close to the moving part 3, that is, it is arranged between the fixed base 7 and the moving part 3. Here, the slider 8 also has a support column 81 extending forward and backward, and the moving part 3 has a circular hole 33, but the support column 81 no longer passes through the long slot 722 but directly penetrates the circular hole 33 and is locked and fixed by a screw 9.

[0074] As can be seen from Figures 31 and 32, the fixed base 7 still retains the groove 72 in the first embodiment that is constructed to penetrate the entire fixed base 7. The groove 72 includes a vertically extending long groove 722 and locking grooves 721 extending laterally from the long groove 722 at different heights.

[0075] Referring to Figures 33 and 34 , the fixed base 7 is provided with a slideway structure 710 on its side surface 700 adjacent to the moving component 3, parallel to the guide rails 71 and disposed between the two guide rails 71. The slider 8 is mounted within the slideway structure 710 to enable up and down movement of the slider 8 on the fixed base 7. The slideway structure 710 may include two generally L-shaped longitudinal lugs 720 facing each other. Together with the side surface 700 of the fixed base 7, these lugs 720 define an elongated longitudinal slideway 730 for accommodating and guiding the square base 85 of the slider 8 to prevent it from tipping forward or backward. The two lugs 720 each have a vertical section 7201 extending forward and backward, parallel to each other, and connected to the side surface 700; and a transverse section 7202 extending left and right, facing each other, and forming a transverse gap 740. The support column 81 of the slider 8 passes through this transverse gap 740 and is guided therein. Here, a transverse locking groove 7203 can be provided on the transverse section 7202 of the left lug 720 at a position corresponding to the front and rear of the locking groove 721. As the movable component 3 moves on the fixed base 7, the locking portion 21 extending through the waist-shaped hole 32 moves up and down within the gap 740 and the elongated groove 722 and can simultaneously enter and exit the locking groove 721 and the locking groove 7203 laterally to lock and unlock the headrest. As in the first embodiment, the locking portion 21 passes through the transverse groove 82 of the slider 8 and can move within the transverse groove 82 during locking and unlocking. Here, in the locked state, the front and rear locking grooves 7203 and 721 provide dual front and rear support for the locking portion 21, and thus the entire headrest 200, significantly increasing the locking security of the headrest.

[0076] Figure 35 schematically illustrates a two-way adjustable headrest mechanism according to a first variant of the second embodiment of the present disclosure. The only difference from the embodiment shown in Figures 31 to 34 is that the slot 72 on the fixed base 7, comprising the elongated slot 722 and the locking slot 721, is configured as a recessed groove that does not penetrate the fixed base 7 and is open only toward the movable component 3. However, the locking portion 21 can still move up and down within the elongated slot 722 of the slot 72 and can enter and exit the locking slot 721. Here, the front locking slot 7203 and the rear locking slot 721 still provide dual front and rear support for the locking portion 21, and thus the entire headrest 200, ensuring a secure lock.

[0077] FIG36 schematically illustrates a two-way adjustable headrest mechanism according to a second variant of the second embodiment of the present disclosure. The only difference from the embodiment shown in FIG31 to FIG34 is that the groove 72 on the fixed base 7 is omitted to simplify the structure. Here, the locking portion 21, and thus the entire headrest 200, is supported solely by the locking groove 7203 on the lug 720 of the slide structure 710.

[0078] In the second embodiment shown in Figures 31 to 36 , although the slider 8 is positioned on the side of the fixed base 7 near the movable component 3, no additional front-to-back space is required for the slider 8 and its slide groove structure 710. This is because the slider 8 and slide groove structure 710 are positioned between the two slide rails 71 and occupy the same front-to-back space originally reserved for the slide rails 71. Compared to the first embodiment, this actually saves the front-to-back space reserved for the slider 8 on the rear side of the fixed base 7, making the entire two-way adjustable headrest mechanism more compact in front-to-back dimensions.

[0079] In addition, the other structures of the second embodiment are the same as those of the first embodiment and can be referred to the first embodiment, which will not be described in detail. In addition, the alternatives of the locking portion 21 shown in Figures 22 to 30 can also be applied to the second embodiment.

[0080] The above descriptions are merely preferred embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. Various modifications are possible to the above embodiments of the present disclosure. In other words, any simple, equivalent changes and modifications made in accordance with the claims and description of the present application are within the scope of protection of the present patent. Anything not fully described in this disclosure refers to conventional technology.

Claims

1. A two-way adjustable headrest mechanism, characterized in that: The two-way adjustable headrest mechanism includes a moving component, a fixed base, and a slider, wherein the fixed base is fixedly mounted on the seat back, one of the fixed base and the moving component has a guide rail, and the other of the fixed base and the moving component has a guide groove, and the guide rail is installed in the guide groove to enable the moving component to move on the fixed base, wherein: The fixed base further has a long slot, the sliding block is located on a side of the fixed base away from the moving part and is fixedly connected to the moving part in a manner of passing through the long slot; or, The slider is located on a side of the fixed base close to the moving part and is fixedly connected to the moving part, and the fixed base is provided with a slide groove structure extending parallel to the guide rail and guide groove on its side close to the moving part, and the slider is installed in the slide groove structure to realize the movement of the slider on the fixed base.

2. The two-way adjustable headrest mechanism according to claim 1, characterized in that: The long slot is configured to extend longitudinally, and the fixed base further has a plurality of transversely extending locking slots connected to the long slot; or, the slide slot structure is configured to extend longitudinally, and the slide slot structure further has a plurality of transversely extending locking slots connected to the transverse gap of the slide slot structure, and the slider is fixedly connected to the moving part in a manner of passing through the transverse gap.

3. The two-way adjustable headrest mechanism according to claim 1, characterized in that: When the slider is located on the side of the fixed base close to the moving part, the fixed base also has a long groove, which is arranged to extend longitudinally, and the fixed base also has a plurality of laterally extending locking grooves connected to the long groove, and the slide groove structure is arranged to extend longitudinally, and the slide groove structure also has a plurality of laterally extending locking grooves connected to the lateral gap of the slide groove structure, and the slider is fixedly connected to the moving part in a manner of passing through the lateral gap.

4. The two-way adjustable headrest mechanism according to claim 3, characterized in that: The long slot is configured to penetrate the fixing base front and back or not penetrate the fixing base.

5. The two-way adjustable headrest mechanism according to claim 2, characterized in that: The two-way adjustable headrest mechanism also includes a locking member movably mounted on the moving component, the locking member having a locking portion. As the moving component moves on the fixed base, the locking portion moves longitudinally in the long slot or in the transverse gap of the slide structure, and can move transversely relative to the moving component to enter the locking slot connected to the long slot or the locking slot connected to the transverse gap of the slide structure for locking.

6. The two-way adjustable headrest mechanism according to claim 3, characterized in that: The two-way adjustable headrest mechanism also includes a locking member movably mounted on the moving component, the locking member having a locking portion. As the moving component moves on the fixed base, the locking portion moves longitudinally in the transverse gap between the long slot and the slide structure, and can move transversely relative to the moving component to enter both the locking slot connected to the long slot and the locking slot connected to the transverse gap of the slide structure for locking.

7. The two-way adjustable headrest mechanism according to claim 5, characterized in that: The two-way adjustable headrest mechanism further comprises a locking spring, which acts on the locking member to keep the locking portion in the locking groove.

8. The two-way adjustable headrest mechanism according to claim 5, characterized in that: The slider has a transverse groove, and the locking portion is inserted into the transverse groove and can move in the transverse groove.

9. The two-way adjustable headrest mechanism according to claim 5, characterized in that: The locking member includes a steel wire, and the locking portion is configured to be bent into a U shape perpendicular to an extending direction of the steel wire.

10. The two-way adjustable headrest mechanism according to claim 5, characterized in that: The locking member includes a push plate and a locking piece that are fixedly connected, and the locking portion is configured as the locking piece that is arranged perpendicular to the moving direction of the push plate.

11. The two-way adjustable headrest mechanism according to claim 5, characterized in that: The locking member includes a rotating shaft and a locking plate that are fixedly connected, and a cable connected to the rotating shaft. The locking portion is configured as the locking plate that can rotate with the rotating shaft under the action of the cable.

12. The two-way adjustable headrest mechanism according to claim 9, 10 or 11, characterized in that: The two-way adjustable headrest mechanism further comprises a button, which acts on the steel wire or the push plate or the pull cable so that the locking portion is disengaged from the locking groove to achieve unlocking.

13. The two-way adjustable headrest mechanism according to claim 1, characterized in that: The two-way adjustable headrest mechanism further comprises a motor and a transmission nut, wherein the motor is fixedly mounted on the fixed base, and the transmission nut is fixedly mounted on the moving component and is threadedly engaged with the lead screw of the motor.

14. The two-way adjustable headrest mechanism according to claim 1, characterized in that: The two-way adjustable headrest mechanism further comprises a lubricating strip arranged between the guide groove and the guide rail.

15. The two-way adjustable headrest mechanism according to claim 1, characterized in that: A metal insert is provided in the fixing base, or a reinforcement is attached to the fixing base, or the fixing base is directly provided by metal material or reinforced plastic.

16. The two-way adjustable headrest mechanism according to claim 1, characterized in that: The sliding groove structure includes two lugs facing each other, and the sliding block is at least partially located in a sliding groove defined by the lugs and a fixed base.

17. The two-way adjustable headrest mechanism according to claim 1, characterized in that: One of the fixed base and the moving component has a guide rail on the left and right sides respectively, and the other of the fixed base and the moving component has a guide groove on the left and right sides respectively, and the slide groove structure is arranged between the two guide rails or guide grooves.

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