Front-back adjusting mechanism, headrest assembly and vehicle seat

Abstract

The utility model relates to a front-back adjusting mechanism, and the front-back adjusting mechanism is used for carrying out front-back adjustment on a headrest cover body of a vehicle seat. The front-and-back adjusting mechanism is provided with a first connecting point matched with the manual front-and-back adjusting function and a second connecting point matched with the electric front-and-back adjusting function, and the first connecting point is used for being connected with a locking mechanism which only plays a locking role in backward adjustment during manual front-and-back adjustment. And the second connecting point is used for connecting a front-back adjusting driving device. The disclosure also relates to a manually adjustable front and back headrest assembly, an electrically adjustable front and back headrest assembly, and a vehicle seat. According to the front-back adjusting mechanism of the modular design, a multifunctional manual / electric adjusting platform can be achieved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicles, and more particularly to a front-rear adjustment mechanism, a manually front-rear adjustable headrest assembly, an electrically front-rear adjustable headrest assembly, and a vehicle seat comprising the manually front-rear adjustable headrest assembly or the electrically front-rear adjustable headrest assembly. BACKGROUND

[0002] In the design of automotive seats, the adjustment function of headrests is one of the key factors for improving comfort and safety. In the traditional headrest adjustment mechanism, only one kind of adjustment function is usually designed. For example, the headrest adjustment mechanism is designed to be suitable for manual adjustment only or is designed to be suitable for automatic adjustment only, i.e. without considering the requirements of universality or modular design. CONTENT OF THE INVENTION

[0003] The purpose of the present disclosure is to provide a front-rear adjustment mechanism, a manually front-rear adjustable headrest assembly comprising the front-rear adjustment mechanism, an electrically front-rear adjustable headrest assembly comprising the front-rear adjustment mechanism, and a vehicle seat comprising the manually front-rear adjustable headrest assembly or the electrically front-rear adjustable headrest assembly, wherein the front-rear adjustment mechanism adopts a modular design and can realize a multifunctional manual / electric adjustment platform. In addition, by adopting a modular design, the whole cycle cost can be saved.

[0004] To this end, the first aspect of the present disclosure relates to a front-rear adjustment mechanism for front-rear adjustment of a headrest cover of a vehicle seat, characterized in that a first connection point matched with a manual front-rear adjustment function and a second connection point matched with an electric front-rear adjustment function are both provided on the front-rear adjustment mechanism, wherein the first connection point is used to connect a locking mechanism that only plays a locking role in rearward adjustment during manual front-rear adjustment, and the second connection point is used to connect a front-rear adjustment drive device.

[0005] By providing a first connection point matched with a manual front-rear adjustment function and a second connection point matched with an electric front-rear adjustment function on the front-rear adjustment mechanism, connection points for both manual front-rear adjustment function and electric front-rear adjustment function are reserved, thereby providing a front-rear adjustment mechanism based on modular design, which can be used as a front-rear adjustment core structure, and based on this one front-rear adjustment core structure, a manually front-rear adjustable headrest assembly, especially a manually front-rear adjustable headrest assembly with one-way locking function, and an electrically front-rear adjustable headrest assembly can be extended according to requirements.

[0006] In some embodiments, the fore-aft adjustment mechanism comprises a base connectable with a backrest of a seat, an upper link plate connectable with a headrest cover or with a fixed base of the up-down adjustment mechanism, and a fore link and an aft link respectively hinged or hingeable with the base and the upper link plate, thereby forming a plurality of hinge points. Thereby, a four-bar linkage assembly for the fore-aft adjustment and up-down adjustment functions can be advantageously provided.

[0007] In some embodiments, the first connection point is located at or in the vicinity of any one of the plurality of hinge points, and the second connection point is located on a main body of the fore link, the aft link, the base or the upper link plate. Thereby, the first connection point and the second connection point can be arranged at suitable locations as required.

[0008] In some embodiments, the fore link is configured in a U-shape, comprising two side legs and a middle connection portion connecting the two side legs. Thereby, sufficient installation space can be left in the middle of the fore link for the arrangement and installation of possible other components. In addition, such a U-shaped structure with a middle connection portion is better in structural strength and rigidity than two separately arranged fore links, can withstand greater forces and is less prone to deformation. In addition, a more stable fore-aft adjustment process can be provided. Furthermore, the U-shaped structure is also more convenient in terms of forming, especially for tubular profile pieces which can advantageously be obtained by bending forming.

[0009] In some embodiments, the second connection point is located on the middle connection portion of the U-shaped fore link. Thereby, sufficient structural space can be provided for the installation and connection of the fore-aft adjustment drive. In addition, since the second connection point is on the middle connection portion, a more uniform distribution of the fore-aft adjustment force can be achieved compared to arranging the second connection point on the side legs.

[0010] In some embodiments, the fore link is configured as a hollow tubular profile piece. Thereby, a stable fore link structure can be provided. Compared to conventional sheet or plate fore links, a fore link configured as a tubular profile piece has a greater cross-sectional moment of inertia, thereby being better able to resist deformation.

[0011] A second aspect of the present disclosure relates to a manually fore-aft adjustable headrest assembly comprising a fore-aft adjustment mechanism according to any one of the embodiments of the present disclosure, the manually fore-aft adjustable headrest assembly having a locking mechanism and an unlocking mechanism for locking a rearward adjustment movement of the fore-aft adjustment mechanism, wherein the locking mechanism is connected with the fore-aft adjustment mechanism at the first connection point.

[0012] In some embodiments, the locking mechanism is configured to not lock the forward adjustment movement of the fore-aft adjustment mechanism to allow the fore-aft adjustment mechanism to forward adjust the headrest cover, and to lock the rearward adjustment movement of the fore-aft adjustment mechanism to restrict the fore-aft adjustment mechanism from rearward adjusting the headrest cover; the unlocking mechanism cooperates with the locking mechanism and is configured to unlock the locking of the locking mechanism when the fore-aft adjustment mechanism rearward adjusts the headrest cover, so that the fore-aft adjustment mechanism can rearward adjust the headrest cover.

[0013] In conventional headrest adjustment mechanisms, upon a forward impact, the headrest can move to the forward-most position and unlock due to inertia, and then automatically retreat to the rear-most position. This can reduce the safety of the seat, as the headrest can not provide sufficient support after the impact, increasing the risk of injury to the passenger. With the manually fore-aft adjustable headrest assembly according to the present disclosure, a unique one-way locking design concept is implemented to achieve the function of not needing to unlock when adjusting forward, and only needing to unlock when adjusting rearward. This one-way locking design concept can avoid the problem of automatically retreating to the rear-most position after moving to the forward-most position due to inertia after a forward impact, thereby improving the safety of the seat. As a result, the stability of the seat headrest when subjected to a forward impact is improved, and the risk of injury to the passenger due to movement of the headrest is reduced. In addition, the adjustment process of the headrest is simplified, and the user can conveniently adjust the headrest rearward when needed, without worrying about safety issues when adjusting forward. In addition, the overall safety and reliability of the seat are also enhanced, providing a more secure driving experience for the user. That is, this design not only improves the safety of the headrest assembly, but also provides a more convenient user experience.

[0014] In some embodiments, the locking mechanism includes a first locking member and a second locking member, wherein the first locking member is repositionably engageable with the second locking member, and when the fore-aft adjustment mechanism forward adjusts the headrest cover, the second locking member is moved to disengage from the first locking member, thereby allowing the fore-aft adjustment mechanism to forward adjust the headrest cover; and when the fore-aft adjustment mechanism rearward adjusts the headrest cover, the first locking member is moved by the unlocking mechanism to disengage from the second locking member, thereby allowing the fore-aft adjustment mechanism to rearward adjust the headrest cover. As a result, an advantageous and reliable locking mechanism can be obtained.

[0015] In some embodiments, the first locking member is provided with a first mating tooth portion at one end thereof, and the second locking member is provided with a second mating tooth portion, the first mating tooth portion and the second mating tooth portion being configured such that a forward adjustment movement of the fore-aft adjustment mechanism can drive a movement of the second locking member, so that the first mating tooth portion and the second mating tooth portion disengage from each other, thereby allowing the fore-aft adjustment mechanism to adjust the headrest cover body forward; and a rearward adjustment movement of the fore-aft adjustment mechanism can drive the first mating tooth portion and the second mating tooth portion to remain engaged, thereby restricting the fore-aft adjustment mechanism to adjust the headrest cover body rearward. In this way, a stepwise adjustable, especially multi-gear adjustable and reliable locking structure can be obtained by means of the tooth portion cooperation, so that the occupant can adjust the headrest cover body to a desired stable position as needed.

[0016] In some embodiments, the unlocking mechanism comprises an unlocking moving member, a movement of the unlocking moving member in the first direction can drive a movement of the first locking member, so that the first locking member disengages from the second locking member, thereby allowing the fore-aft adjustment mechanism to adjust the headrest rearward. In this way, a convenient unlocking can be realized, and the occupant can realize the unlocking by simply pushing or pulling the unlocking moving member.

[0017] In some embodiments, the first locking member is arranged to be rotatable about a first rotation axis extending in the first direction, and the unlocking mechanism further comprises an intermediate transmission member cooperating with the first locking member, a movement of the unlocking moving member in the first direction can drive a movement of the intermediate transmission member, which in turn drives the first locking member to rotate. By arranging the intermediate transmission member, the movement of the unlocking moving member can be advantageously converted into other forms of movement of the first locking member.

[0018] In some embodiments, a movement of the unlocking moving member in the first direction can drive the intermediate transmission member to rotate, thereby driving the first locking member to rotate. In this way, the movement of the unlocking moving member can be advantageously converted into the rotation of the first locking member via the rotation of the intermediate transmission member.

[0019] In some embodiments, the intermediate transmission member comprises a rotation shaft extending in the vertical direction, and a first extension portion and a second extension portion arranged on the rotation shaft for cooperating with the unlocking moving member and the first locking member respectively, so that a movement of the unlocking moving member in the first direction drives the rotation shaft to rotate via the first extension portion, which in turn drives the first locking member to rotate about the first rotation axis extending in the first direction. In this way, an advantageous intermediate transmission member structure can be provided, which can realize reliable movement transmission.

[0020] In some embodiments, a movement of the unlocking moving member in the first direction can drive the intermediate transmission member to translate, thereby driving the first locking member to rotate. In this way, the movement of the unlocking moving member can be advantageously converted into the rotation of the first locking member via the translation of the intermediate transmission member.

[0021] In some embodiments, the unlocking moving part and the intermediate transmission part are cooperated by a first inclined surface structure, such that the movement of the unlocking moving part in the first direction can drive the intermediate transmission part to translate in a second direction which is orthogonal to the first direction, wherein the translation of the intermediate transmission part in the second direction drives the first locking part to rotate. Thus, the translation of the unlocking moving part to the translation of the intermediate transmission part can be realized by simply setting the first inclined surface structure, and such an inclined surface structure can realize a robust motion conversion.

[0022] In some embodiments, the rotatable first locking part has a protruding hook as the first mating tooth part, and the shape of the hook and the shape of the second mating tooth part of the second locking part are designed such that the first mating tooth part of the rotatable first locking part and the second mating tooth part of the second locking part constitute a first ratchet structure, and when the front and rear adjusting mechanism adjusts the headrest cover body forward, the second locking part can be driven to move, so that the first locking part rotates and the hook and the second mating tooth part are automatically disengaged from each other. Thus, a reliable one-way locking function can be realized by the first ratchet structure.

[0023] In some embodiments, the movement of the unlocking moving part in the first direction can drive the first locking part to translate. Thus, an advantageous motion transmission of the unlocking moving part to the first locking part can be realized, thereby realizing a robust motion transmission.

[0024] In some embodiments, the unlocking moving part and the first locking part are cooperated by a second inclined surface structure, such that the movement of the unlocking moving part in the first direction can drive the first locking part to translate in a second direction which is orthogonal to the first direction. Thus, the translation of the unlocking moving part to the translation of the first locking part can be realized by simply setting the second inclined surface structure, and such an inclined surface structure can realize a robust motion conversion.

[0025] In some embodiments, the first mating tooth part of the rotatable first locking part and the second mating tooth part of the second locking part constitute a second ratchet structure, and when the front and rear adjusting mechanism adjusts the headrest cover body forward, the second locking part can be driven to move, so that the first locking part translates and the first mating tooth part and the second mating tooth part are automatically disengaged from each other. Thus, a reliable one-way locking function can be realized by the second ratchet structure.

[0026] In some embodiments, the manually front and rear adjustable headrest assembly further comprises an up and down adjusting mechanism, and the up and down adjusting mechanism comprises a moving part and a fixed base, wherein the fixed base is connected with the front and rear adjusting mechanism, the moving part is connected with the headrest cover body, and the moving part can slide up and down relative to the fixed base, thereby realizing the up and down adjustment of the headrest cover body. Thus, the up and down adjustment function of the headrest cover body can be additionally provided in addition to the front and rear adjustment function.

[0027] In some embodiments, a plurality of spaced locking grooves are provided on the fixed base, and the unlocking mobile piece cooperates with the locking grooves as the up-down adjusting unlocking piece, wherein when the unlocking mobile piece is engaged with the locking grooves, the up-down adjusting mechanism is restricted from adjusting the headrest cover body; and when the unlocking mobile piece is disengaged from the locking grooves, the up-down adjusting mechanism is allowed to adjust the headrest cover body. Thus, the same unlocking mobile piece can be used to achieve simultaneous unlocking of the rearward adjustment and the up-down adjustment of the headrest cover body.

[0028] In some embodiments, the unlocking mobile piece comprises a protruding mobile part, and movement of the unlocking mobile piece in the first direction causes the protruding mobile part to disengage from the locking grooves, while causing the first locking piece to move to disengage from the second locking piece, thereby allowing the up-down adjusting mechanism to adjust the headrest up and down and allowing the forward-rearward adjusting mechanism to adjust the headrest rearward. The protruding mobile part can be configured as a U-shaped part, for example. Thus, the protruding mobile part of the unlocking mobile piece can be used to advantageously achieve simultaneous unlocking of the rearward adjustment and the up-down adjustment of the headrest cover body.

[0029] In some embodiments, the up-down adjusting mechanism further comprises a second motor assembly, which comprises a second motor, a second screw rod rotationally connected to the second motor, and a second nut provided on the second screw rod, wherein the second motor is fixed relative to one of the fixed base and the moving part, and the second nut is actionally connected to the other of the fixed base and the moving part, and when the second motor drives the second nut to move along the second screw rod, the moving part moves relative to the fixed base. Thus, an advantageous motor-based automatic up-down adjustment can be achieved. In the present disclosure, “actionally connected” means that the second nut can be fixedly connected to the corresponding part, or connected through a transmission mechanism.

[0030] In some embodiments, the second locking piece is provided on one of the front connecting rod and the rear connecting rod, such that the second mating tooth part is close to any one of the plurality of hinge points, wherein when the second mating tooth part is close to the upper hinge point, the first locking piece is movably provided on the upper connecting plate; and when the second mating tooth part is close to the lower hinge point, the first locking piece is movably provided on the base. Thus, the first locking piece and the second locking piece can be advantageously provided on the corresponding parts of the four-bar linkage assembly as needed.

[0031] In some embodiments, the second locking member further has a link articulation for articulately connecting the front link with the upper connection plate, wherein the second locking member is arranged on a side area of the intermediate connection portion of the front link. In this way, the second locking member not only assumes the locking function, but also assumes the articulation function of the front link with other parts of the four-link assembly, and thus the second locking member is fully utilized. In addition, this is also compatible with the U-shaped structure of the front link, and since the second locking member additionally assumes the articulation function, it is not necessary to additionally provide a link articulation on the U-shaped front link, which is beneficial to the manufacture of the U-shaped front link.

[0032] In some embodiments, the second locking member has a protrusion extending in its transverse direction from the side, for increasing the connection area of the second locking member with the front link. In this way, a more secure connection of the second locking member on the front link can be achieved.

[0033] In some embodiments, a limiting member is arranged on the side of the first locking member facing away from the upper connection plate or the base, and the limiting member is configured to limit the lateral movement of the first locking member to prevent the first mating tooth portion from being disengaged from the second mating tooth portion. In this way, the first mating tooth portion can be prevented from being disengaged from the second mating tooth portion by using a simple limiting member.

[0034] In some embodiments, when the first locking member is configured to be slidable, the first locking member is arranged in a slidable manner on the upper connection plate or the base by a sliding groove type sliding structure. In this way, an advantageous and robust sliding fit of the first locking member with the upper connection plate or the base can be achieved.

[0035] In some embodiments, the unlocking movement member comprises or is configured as a push member, wherein the movement of the first locking member can be driven by the pushing of the push member in the first direction. In this way, in the case of a push member, the passenger can intuitively achieve unlocking by pushing the push member. In addition, in the case of a push member, the design of other cooperating components associated therewith is also simpler.

[0036] A third aspect of the present disclosure relates to an electrically adjustable headrest assembly, comprising a fore-aft adjustment mechanism according to any one of the embodiments of the present disclosure, the electrically adjustable headrest assembly comprising a first motor assembly for driving the fore-aft adjustment mechanism to perform a fore-aft adjustment movement, the first motor assembly being connected to the fore-aft adjustment mechanism at a second connection point as a fore-aft adjustment drive.

[0037] In some embodiments, the first motor assembly comprises a first motor, a first screw rod rotationally connected with the first motor, and a first nut arranged on the first screw rod, wherein the first motor is pivotably arranged on one of the base and the upper connecting plate, and the first nut is pivotably connected with one of the front link and the rear link, or the first motor is pivotably arranged on one of the front link and the rear link, and the first nut is pivotably connected with one of the base and the upper connecting plate. In this way, an advantageous motor-based automatic forward and backward adjustment can be realized. In addition, the first motor assembly can be flexibly connected on the forward and backward adjustment mechanism according to the modular design of the present disclosure as needed.

[0038] In some embodiments, the first motor is pivotably arranged on the base, and the first nut is directly or indirectly pivotably connected with the front link via an intermediate connecting plate. In this way, a part of the first motor assembly can be directly or indirectly pivotably connected on the front link while making full use of the structural space provided by the front link.

[0039] In some embodiments, the first nut is pivotably connected with the intermediate connecting portion of the front link. In this way, a good force distribution and full use of the front link structural space can be realized.

[0040] In some embodiments, the electrically adjustable headrest assembly further comprises an up and down adjustment mechanism, the up and down adjustment mechanism comprising a moving component and a fixed base, wherein the fixed base is connected with the forward and backward adjustment mechanism, and the moving component is connected with the headrest cover and is capable of sliding up and down relative to the fixed base, thereby realizing up and down adjustment of the headrest cover. In this way, an up and down adjustment function of the headrest cover can be additionally provided in addition to the forward and backward adjustment function.

[0041] In some embodiments, a plurality of spaced locking grooves are arranged on the fixed base, and the up and down adjustment mechanism comprises an up and down adjustment unlocking member cooperating with the locking grooves, wherein when the up and down adjustment unlocking member is engaged with the locking grooves, the up and down adjustment mechanism is limited to adjust the headrest cover; and when the up and down adjustment unlocking member is disengaged from the locking grooves, the up and down adjustment mechanism is allowed to adjust the headrest cover. In this way, an advantageous unlocking of the up and down adjustment can be realized.

[0042] In some embodiments, the up and down adjustment mechanism further comprises a second motor assembly, the second motor assembly comprising a second motor, a second screw rod rotationally connected with the second motor, and a second nut arranged on the second screw rod, wherein the second motor is fixedly arranged relative to one of the fixed base and the moving component, and the second nut is actionally connected with the other one of the fixed base and the moving component, and when the second motor drives the second nut to move along the second screw rod, the moving component moves relative to the fixed base. In this way, an advantageous motor-based automatic up and down adjustment can be realized.

[0043] A fourth aspect of this disclosure relates to a vehicle seat, characterized in that the vehicle seat includes a manually adjustable fore-and-aft headrest assembly according to any embodiment of this disclosure or an electrically adjustable fore-and-aft headrest assembly according to any embodiment of this disclosure.

[0044] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0045] The present disclosure will be further described below with reference to the illustrative drawings and exemplary embodiments. Wherein:

[0046] Figure 1 A schematic exploded view of one embodiment of the front and rear adjustment mechanism according to the present disclosure is shown.

[0047] Figure 2 A schematic diagram of a first embodiment of a manually adjustable headrest assembly according to the present disclosure is shown, in different positions when adjusted forward while mounted on a seat frame.

[0048] Figure 3a A schematic perspective view from the front side shows a manual front-to-back adjustment mechanism with a locking mechanism for manual adjustment, according to a first embodiment of a manually adjustable headrest assembly based on the present disclosure.

[0049] Figure 3b Showing according to Figure 3a A schematic perspective view from the side and rear of the manual front and rear adjustment mechanism with locking mechanism for manual adjustment.

[0050] Figure 4 Showing according to Figure 3a A schematic exploded view of a manual forward and backward adjustment mechanism with a locking mechanism for manual adjustment.

[0051] Figure 5 A schematic perspective view showing a first embodiment of a manually adjustable headrest assembly according to the present disclosure.

[0052] Figure 6 Show Figure 5 A schematic exploded view of the manually adjustable headrest assembly.

[0053] Figure 7 Show Figure 5Top view of a partial portion of the manually forward and backward adjustable headrest assembly in

[0054] Figure 8 shows Figure 7 Top view of another sectional view of a partial portion of the manually forward and backward adjustable headrest assembly in

[0055] Figure 9 shows a schematic perspective view of the unlocking mechanism and the locking mechanism of the first embodiment of the manually forward and backward adjustable headrest assembly according to the present disclosure, wherein the locking mechanism is in the locked state.

[0056] Figure 10 shows Figure 9 Another schematic perspective view of the unlocking mechanism and the locking mechanism in

[0057] Figure 11 shows a schematic perspective view of a partial portion of the first embodiment of the manually forward and backward adjustable headrest assembly according to the present disclosure.

[0058] Figures 12 to 14 shows a schematic view of the manual forward and backward adjustment mechanism with the locking mechanism for manual adjustment of the first embodiment of the manually forward and backward adjustable headrest assembly according to the present disclosure in different states when adjusting forward.

[0059] Figures 15 to 17 shows a schematic view of the manual forward and backward adjustment mechanism with the locking mechanism for manual adjustment of the first embodiment of the manually forward and backward adjustable headrest assembly according to the present disclosure in different states when unlocked and adjusting backward.

[0060] Figure 18 shows a schematic detail view of the stop member for at least limiting the lateral movement of the first locking member and the arrangement of the first locking member and the second locking member.

[0061] Figure 19 shows a schematic view of the engagement structure of the locking mechanism of the first embodiment of the manually forward and backward adjustable headrest assembly according to the present disclosure.

[0062] Figure 20 shows a schematic perspective view of a partial portion of the second embodiment of the manually forward and backward adjustable headrest assembly according to the present disclosure.

[0063] Figure 21 shows Figure 20 Schematic exploded view of a partial portion of the second embodiment of the manually forward and backward adjustable headrest assembly in

[0064] Figure 22 andFigure 23 Fig. 6 shows a schematic perspective view of a partial portion of the manually adjustable headrest assembly according to the present disclosure in a locked state.

[0065] Figure 24 and Figure 25 Fig. 7 shows a schematic perspective view of a partial portion of the manually adjustable headrest assembly according to the present disclosure in an unlocked state.

[0066] Figure 26 Fig. 8 shows a schematic perspective view of a partial portion of the manually adjustable headrest assembly according to the present disclosure in the unlocked state from another angle.

[0067] Figure 27 Fig. 9 shows a schematic view of the engagement structure of the locking mechanism of the second embodiment of the manually adjustable headrest assembly according to the present disclosure.

[0068] Figure 28 Fig. 10 shows a schematic perspective view of a partial portion of the second embodiment of the manually adjustable headrest assembly according to the present disclosure, wherein the locking mechanism is in the locked state.

[0069] Figure 29 Fig. 11 shows another schematic perspective view of a partial portion of Figure 28 Fig. 12 shows a schematic perspective view of a partial portion of

[0070] Figure 30 Fig. 13 shows a schematic perspective view of a partial portion of Figure 28 Fig. 14 shows a schematic perspective view of a partial portion of

[0071] Figure 31 Fig. 15 shows a schematic perspective view of a third embodiment of the manually adjustable headrest assembly according to the present disclosure with a manually adjustable fore-aft adjustment mechanism and a manually adjustable up-down adjustment mechanism, wherein the fore-aft adjustment mechanism is for manual adjustment and with a locking mechanism.

[0072] Figure 32 Fig. 16 shows a schematic exploded view of the manually adjustable fore-aft adjustment mechanism, the manually adjustable up-down adjustment mechanism and the unlocking mechanism of Figure 31 Fig. 17 shows a schematic perspective view of the unlocking mechanism and the locking mechanism of the third embodiment of the manually adjustable headrest assembly according to the present disclosure, wherein the locking mechanism is in the locked state.

[0073] Figure 33 Fig. 18 shows a schematic perspective view of a partial portion of the third embodiment of the manually adjustable headrest assembly according to the present disclosure in a locked state.

[0074] Figure 34 Fig. 19 shows another schematic perspective view of a partial portion of Figure 33Another schematic perspective view of the unlocking and locking mechanisms, with the locking mechanism in the unlocked state.

[0075] Figure 35 Show Figure 33 A schematic top-view cross-sectional view of a portion of the unlocking and locking mechanisms.

[0076] Figure 36 Show Figure 34 A schematic top-view cross-sectional view of a portion of the unlocking and locking mechanisms.

[0077] Figure 37a A schematic perspective view of a fourth embodiment of the headrest assembly according to the present disclosure, with a manual fore-and-aft adjustment mechanism and an electric up-and-down adjustment mechanism, is shown, wherein the fixed base of the up-and-down adjustment mechanism is omitted for clarity.

[0078] Figure 37b A schematic exploded view of a fourth embodiment of the headrest assembly according to the present disclosure, featuring a manual fore-and-aft adjustment mechanism and an electric up-and-down adjustment mechanism, is shown.

[0079] Figure 38a and Figure 38b Schematic perspective views from different rear-side views are shown of the electric fore-and-aft adjustment mechanism with fore-and-aft adjustment drive device of a first embodiment of the electrically adjustable headrest assembly according to the present disclosure.

[0080] Figure 38c Show Figure 38a A schematic exploded view of an electric front-to-back adjustment mechanism with a front-to-back adjustment drive.

[0081] Figure 39 A schematic perspective view of an electric fore-and-aft adjustment mechanism and a manual up-and-down adjustment mechanism according to a second embodiment of an electrically adjustable headrest assembly of the present disclosure is shown, wherein the fore-and-aft adjustment mechanism is equipped with a fore-and-aft adjustment drive.

[0082] Figure 40 Show Figure 39 An exploded schematic diagram of an electric front-to-back adjustment mechanism with a front-to-back adjustment drive and a manual up-and-down adjustment mechanism.

[0083] Figure 41 Show Figure 39 A schematic cross-sectional view of an electrically adjustable headrest assembly with an electric fore-and-aft adjustment mechanism and a fore-and-aft adjustment drive in the retracted state.

[0084] Figure 42 Show Figure 39 A schematic cross-sectional view of an electrically adjustable headrest assembly with an electric fore-and-aft adjustment mechanism in the deployed state.

[0085] Figure 43 Fig. 6 shows a schematic perspective view of the electric fore-aft adjustment mechanism and the electric up-down adjustment mechanism of a third embodiment of the electrically fore-aft adjustable headrest assembly according to the present disclosure, with the respective adjustment drives.

[0086] Figure 44 Fig. 7 shows a schematic exploded view of the electric fore-aft adjustment mechanism and the electric up-down adjustment mechanism of the third embodiment of the electrically fore-aft adjustable headrest assembly according to the present disclosure with the respective adjustment drives. Figure 43

[0087] Fig. 8 shows a schematic cross-sectional view of the electric fore-aft adjustment mechanism and the electric up-down adjustment mechanism of the third embodiment of the electrically fore-aft adjustable headrest assembly according to the present disclosure with the respective adjustment drives. Figure 45 DETAILED DESCRIPTION Figure 43 Fig. 1 shows a schematic exploded view of one embodiment of the fore-aft adjustment mechanism according to the present disclosure. The fore-aft adjustment mechanism is generally configured as a four-bar linkage assembly. The fore-aft adjustment mechanism mainly comprises a base, an upper connecting plate 110 and a front link 105 and a rear link 108 which are respectively hinged or hingeable to the base and the upper connecting plate 110. The base can comprise a lower connecting plate 114 and a backrest connecting plate 116 which is fixedly connected, in particular welded, to the lower connecting plate 114, wherein the lower connecting plate 114 of the base is hinged to the front link 105 and the rear link 108. The upper connecting plate 110 can be used to connect to a headrest cover (for the case of fore-aft adjustment only) or to a component for up-down adjustment (for the case of fore-aft adjustment and up-down adjustment). In the four-bar linkage assembly, the backrest connecting plate 116 and the lower connecting plate 114 are welded to form the base or the fixed end. The rear link 108 and the upper connecting plate 110 form a turning pair through a connecting pivot 112, wherein the rear link 108 is fixedly welded to the connecting pivot 112. The lower connecting plate 114 forms a turning pair with the rear link 108 and the front link 105 through step rivets 101, wherein a bushing is respectively sleeved on the step rivets 101. The hinged structure of the front link 105 and the upper connecting plate 110 is not shown in Fig. 1. It is envisaged that a structure or component for hinging with the upper connecting plate 110 can be provided in the upper region of the front link 105. In the four-bar linkage assembly, there can be multiple hinging points.

[0088] Figure 1

[0089] The fore-aft adjustment mechanism is generally configured as a four-bar linkage assembly. The fore-aft adjustment mechanism mainly comprises a base, an upper connecting plate 110 and a front link 105 and a rear link 108 which are respectively hinged or hingeable to the base and the upper connecting plate 110. The base can comprise a lower connecting plate 114 and a backrest connecting plate 116 which is fixedly connected, in particular welded, to the lower connecting plate 114, wherein the lower connecting plate 114 of the base is hinged to the front link 105 and the rear link 108. The upper connecting plate 110 can be used to connect to a headrest cover (for the case of fore-aft adjustment only) or to a component for up-down adjustment (for the case of fore-aft adjustment and up-down adjustment). In the four-bar linkage assembly, the backrest connecting plate 116 and the lower connecting plate 114 are welded to form the base or the fixed end. The rear link 108 and the upper connecting plate 110 form a turning pair through a connecting pivot 112, wherein the rear link 108 is fixedly welded to the connecting pivot 112. The lower connecting plate 114 forms a turning pair with the rear link 108 and the front link 105 through step rivets 101, wherein a bushing is respectively sleeved on the step rivets 101. The hinged structure of the front link 105 and the upper connecting plate 110 is not shown in Fig. 1. It is envisaged that a structure or component for hinging with the upper connecting plate 110 can be provided in the upper region of the front link 105. In the four-bar linkage assembly, there can be multiple hinging points. Figure 1

[0090] ​​​In order to achieve a better deformation resistance, the front link 105 is configured as a hollow tubular profile. The front link 105 is furthermore configured in a U-shape, comprising two side legs and a middle connecting portion connecting the two side legs or comprising a middle connecting portion or two side legs extending from both ends of the middle connecting portion, which U-shape provides a corresponding arrangement space for a screw rod arrangement of a motor for a possible automatic forward and backward adjustment function, whereby the side space of the front link 105 can be occupied.

[0091] The forward and backward adjustment mechanism is designed in a modular manner, which can not only be used to expand the manual forward and backward adjustment function, but also to expand the electric forward and backward adjustment function. For this purpose, the forward and backward adjustment mechanism is not only provided with a first connection point matched with the manual forward and backward adjustment function, but also provided with a second connection point matched with the electric forward and backward adjustment function. The first connection point is used to connect a locking mechanism which only plays a locking role for backward adjustment when the manual forward and backward adjustment is performed, and the second connection point is used to connect the forward and backward adjustment driving device. The first connection point can be located at or near any one of the plurality of hinge points, and the second connection point can be located on the main body of the front link 105, the rear link 108, the base or the upper connecting plate 110. Preferably, the first connection point can be located at the hinge point of the front link 105 and the upper connecting plate 110. Furthermore preferably, the second connection point is located on the middle connecting portion of the U-shaped front link 105.

[0092] The overall concept of the manually forward and backward adjustable headrest assembly for a vehicle seat according to the present disclosure is described below with the aid of Figure 2 The overall concept of the manually forward and backward adjustable headrest assembly for a vehicle seat according to the present disclosure is described below with the aid of Figure 2 The principle of action of the manually forward and backward adjustable headrest assembly according to the present disclosure when adjusting forward (including in the case of a collision) is described in the following. A one-way locking design concept is realized to achieve the function of not needing to be unlocked when adjusting forward, and only needing to be unlocked when adjusting backward, wherein the headrest assembly can be adjusted without unlocking when adjusting forward, and only needs to be unlocked when adjusting backward. Figure 2Unlike existing technologies, the rightmost forward position does not automatically unlock; when adjusting backward, the manually adjustable headrest assembly needs to be unlocked. In this disclosure, "adjustment" can be either manual adjustment actively performed by the occupant or adjustment movement caused by inertia during a collision. To achieve this one-way locking function, the manually adjustable headrest assembly according to this disclosure also includes a locking mechanism for locking the adjustment movement of the forward / backward adjustment mechanism; and an unlocking mechanism. In the manually adjustable headrest assembly, the locking mechanism is connected to the forward / backward adjustment mechanism at a first connection point. Preferably, to achieve the one-way locking function, the locking mechanism is configured not to lock the forward adjustment movement of the front-to-back adjustment mechanism, thus allowing the front-to-back adjustment mechanism to adjust the headrest cover forward, while locking the backward adjustment movement of the front-to-back adjustment mechanism, thus restricting the rearward adjustment of the headrest cover. The unlocking mechanism cooperates with the locking mechanism and is configured to unlock the locking mechanism when the front-to-back adjustment mechanism adjusts the headrest cover backward, allowing the front-to-back adjustment mechanism to adjust the headrest cover backward. By providing a manually adjustable front-to-back headrest assembly according to this disclosure, it is possible, for example, in the event of a collision, to prevent the headrest cover from moving to its forwardmost position due to inertia after a forward impact. Figure 1 After the rightmost position is shown, it will automatically unlock and return to the last position. Figure 1 In the position shown on the far left.

[0093] Next, using Figures 3a to 4 The arrangement of the manual back-and-forth adjustment mechanism and the locking mechanism according to a first embodiment of the manually adjustable headrest assembly of the present disclosure is described.

[0094] like Figures 3a to 4 As shown, the manual fore-and-aft adjustment mechanism of the manually adjustable headrest assembly is generally consistent with... Figure 1 The front-to-back adjustment mechanisms shown are the same, except that in the manually adjustable headrest assembly, a return spring 109 is provided inside both sides of the rear link 108. The return springs 109 are respectively sleeved on the connecting shaft 112 and provide return assistance during rearward adjustment. Furthermore, the hinge structure between the front link 105 and the upper connecting plate 110 also differs; in the manually adjustable headrest assembly, the hinged connection also forms a corresponding component for the unlocking mechanism.

[0095] To facilitate the description of the hinged structure, let's first use... Figure 3b and Figure 4The unlocking mechanism of the first embodiment is described. The locking mechanism comprises a first locking member and a second locking member, the first locking member being repositionably engageable with the second locking member, wherein the first locking member is provided with a first mating tooth portion at one end thereof, and the second locking member is provided with a second mating tooth portion, the first mating tooth portion and the second mating tooth portion being configured such that a forward adjustment movement of the fore-aft adjustment mechanism can drive the second locking member to move so that the second mating tooth portion and the first mating tooth portion disengage with each other, thereby allowing the fore-aft adjustment mechanism to adjust the headrest cover body forward; and a backward adjustment movement of the fore-aft adjustment mechanism can drive the first locking member to move so that the first mating tooth portion and the second mating tooth portion remain engaged, thereby restricting the fore-aft adjustment mechanism to adjust the headrest cover body backward. In the unlocking mechanism, the first locking member is configured as a rotating locking plate 103, and the second locking member is configured as a first mating locking plate 107, wherein the rotating locking plate 103 is provided with a rotating locking plate-locking portion 1033 as the first mating tooth portion, and the first mating locking plate 107 is provided with a first mating locking plate-locking tooth 1071 as the second mating tooth portion. In addition, the first mating locking plate 107 is further provided with a linkage hinging portion for hingedly connecting the front linkage 105 with the upper connecting plate 110. The first mating locking plate 107 can be arranged on the side area of the middle connecting portion of the front linkage 105, especially near the U-shaped structure. The rotating rotating locking plate 103 and the first mating locking plate 107 constitute a first ratchet structure. For this purpose, the rotating locking plate-locking portion 1033 of the rotating rotating locking plate 103 is configured as a protruding hook-shaped portion, and the shape of the hook-shaped portion of the rotating rotating locking plate 103 and the shape of the first mating locking plate-locking tooth 1071 of the first mating locking plate 107 are designed such that the rotating locking plate-locking portion 1033 of the rotating rotating locking plate 103 and the first mating locking plate-locking tooth 1071 of the first mating locking plate 107 constitute a first ratchet structure. When the fore-aft adjustment mechanism adjusts the headrest cover body forward, the first mating locking plate 107 can be driven to move so that the rotating rotating locking plate 103 rotates and its first mating tooth portion and the second mating tooth portion disengage with each other. At this time, the rotating rotating locking plate 103 can be configured functionally similar to a pawl, and the first mating locking plate 107 can be configured functionally similar to a ratchet wheel.

[0096] In Figure 3b and Figure 4In one embodiment of the arrangement of the front-rear adjustment mechanism and the locking structure of the manually front-rear adjustable headrest assembly shown, the front link 105 is fixed by welding at both sides of its upper portion with the second locking member configured as the first counter locking plate 107 and the front link articulation plate 113, and then forms a rotary pair with the upper connecting plate 110 via the articulation link of the first counter locking plate 107 and the articulation link of the front link articulation plate 113, wherein a bushing is also sleeved on the corresponding stepped rivet 101. That is, the second locking member simultaneously realizes the functions of locking and articulation. In addition, in order to improve the connection strength, the first counter locking plate 107 is provided with a protrusion 1072 extending in its transverse direction from the side surface, so as to increase the connection area of the first counter locking plate 107 and the front link 105. Corresponding to the arrangement position of the first counter locking plate 107, as shown in Figure 3b and Figure 4 The first locking member configured as the rotary locking plate 103 is rotatably arranged at one connecting point, such as a rotary connecting hole, of the upper connecting plate 110. For this purpose, a nut 104 and a stepped screw 115 are also provided for articulating the rotary locking plate 103 to the upper connecting plate 110. In addition, in order to realize the resettable engagement of the first counter tooth portion of the first locking member configured as the rotary locking plate 103 and the second counter tooth portion of the second locking member configured as the first counter locking plate 107, a rotary locking plate-resetting tension spring 102 is also provided, which is connected at one end to the upper connecting plate 110 and at the other end to the portion of the first locking member opposite to the first counter tooth portion.

[0097] It is pointed out here that, in addition to the locking mechanism arrangement shown in Figure 3b or 4, other arrangements can also be envisaged. For example, the second counter tooth portion on the first counter locking plate 107 can also be moved to or near other articulation points of the four-bar linkage assembly 1. For example, the tooth feature of the second counter tooth portion of the second locking member can be welded or integrated at the lower articulation point of the front link 105. Accordingly, the first locking member is no longer articulated with the upper connecting plate 110, but is articulated with the lower connecting plate 114, so as to realize the cooperation of the first counter tooth portion of the first locking member and the second counter tooth portion of the second locking member. At this time, the original first counter locking plate 107 can be replaced by the front link articulation plate 113, that is, the front link 105 is articulated with the upper connecting plate 110 via the front link articulation plates 113 on both sides. In addition, in addition to the front link 105, it can also be envisaged to arrange the locking mechanism at or near the articulation points of the rear link 108 and the upper connecting plate 110 or the lower connecting plate 114.

[0098] In summary, the second locking member configured as the first mating locking plate 107 is arranged on one of the front link 105 and the rear link 108, such that the second mating tooth portion is arranged close to any one of the plurality of articulation points, wherein when the second mating tooth portion is arranged close to the upper articulation point, the first locking member configured as the rotating locking plate 103 is rotatably arranged on the upper connecting plate 110; and when the second mating tooth portion is arranged close to the lower articulation point, the first locking member is rotatably arranged on the base, in particular the lower connecting plate 114 of the base.

[0099] The arrangement and the action principle of the unlocking mechanism, the locking mechanism and the fore-aft adjustment mechanism of a first embodiment of the manually fore-aft adjustable headrest assembly according to the present disclosure will be described below with the help of Figures 5 to 11 The arrangement and the action principle of the unlocking mechanism, the locking mechanism and the fore-aft adjustment mechanism of a first embodiment of the manually fore-aft adjustable headrest assembly according to the present disclosure will be described below with the help of

[0100] As Figure 5 and Figure 6 The manually fore-aft adjustable headrest assembly further comprises a headrest cover, which comprises a front cover 2 and a rear cover 3. The four-bar linkage assembly 1 is fixed to the front cover 2 by means of screws, while the rear cover 3 is fixed to the front cover 2 by means of plastic snaps. The unlocking mechanism comprises a pusher 6 as an unlocking moving member and an intermediate transmission member configured as a rotating transmission member 8, which cooperates with the rotating locking plate 103. The pusher 6 can be pushed in a first direction and can thereby rotate the rotating transmission member 8, which in turn rotates the rotating locking plate 103 about a first rotation axis extending in the first direction. Here, the first direction can be the transverse direction of the manually fore-aft adjustable headrest assembly or the fore-aft adjustment mechanism. In order to realize the manual manipulation of the pusher 6, the unlocking mechanism further comprises a button 4 and a button return spring 5 for returning the button. The button 4 is fixed to the rear cover 3 by means of plastic snaps.

[0101] From Figures 7 to 11 It can be clearly seen that when a force acts on the button 4, the button 4 slides, for example, to the right through the button frame 302, thereby the button 4 generates a pushing force on the pusher 6. The pusher 6 pushes the rotating transmission member 8, which rotates the rotating transmission member 8 through the rotation shaft 801 to rotate away the first locking member configured as the rotating locking plate 103, thereby unlocking the fore-aft adjustment mechanism configured as the four-bar linkage assembly 1. In order to realize such rotation, the rotation shaft 801 is respectively provided with a first protruding portion 8021 and a second protruding portion 8022 for cooperating with the pusher 6 and the rotating locking plate 103. Specifically, as Figures 9 to 11As shown, the pusher 6 moves under the action of the thrust, pushing the first extension 8021 of the rotary transmission member 8 through the push plate sliding part 601, causing the rotating shaft 801 to rotate. Then, the second extension 8022 acts on the rotary locking plate-unlocking part 1031 and thereby applies a force that generates a pulling action. Under the action of this force, the rotary locking plate 103 rotates around the rotary locking plate-rotation center 1032, or around the first rotation axis extending in the first direction, thereby completing the unlocking action. After the thrust is removed, the rotary transmission member 8 is reset by the rotary transmission member-reset torsion spring 7, and the rotary locking plate 103 is reset by the rotary locking plate-reset tension spring 102.

[0102] In embodiments not shown, in addition to the aforementioned rotary intermediate transmission, a translational intermediate transmission can also be conceived for the intermediate transmission member. In the case of such a translational intermediate transmission member, the movement of the pusher 6 along the first direction can drive the translational intermediate transmission member to translate, thereby causing the rotary locking plate 103 to rotate. In particular, the pusher 6 can cooperate with the translational intermediate transmission member through a first inclined surface structure, such that the movement of the pusher 6 along the first direction can drive the translational intermediate transmission member to translate along a second direction orthogonal to the first direction. The translation of the translational intermediate transmission member along the second direction can exert a force on the rotary locking plate-unlocking part 1031 of the rotary locking plate 103 to cause the rotary locking plate 103 to rotate. This first inclined surface structure can convert movement along one direction into movement along another direction, especially one orthogonal to the aforementioned direction, thereby realizing the motion conversion from the movement of the pusher 6 to the rotation of the rotary locking plate 103.

[0103] Next, using Figures 12 to 17 Describe the gear adjustment principle of the front and rear adjustment mechanism, which is constructed as a four-bar linkage assembly 1.

[0104] like Figures 12 to 14 As shown, during forward adjustment, unlocking is not required. The upper connecting plate 110 is subjected to a positive pulling force (e.g., a leftward pulling force as shown in the figure), which drives the front connecting rod 105 and the first paired locking plate 107 to rotate forward around the hinge point of the lower connecting rod at the front. The second paired teeth of the first paired locking plate-locking tooth 1071 drive the first paired teeth of the rotating locking plate-locking part 1033 to rotate around the rotating locking plate-rotation center 1032 and disengage from each other. Then, through the pulling force of the rotating locking plate-reset spring 102, they re-engage into the next slot of the first paired locking plate-locking tooth 1071, completing the gear adjustment. Unlocking is not required during this process.

[0105] In addition, such as Figures 15 to 17As shown, when adjusting backward, first, the unlocking mechanism is unlocked, under the action of the unlocking mechanism, the rotating locking plate-unlocking part 1031 is stressed and thus rotates and unlocks around the rotating locking plate-rotation center 1032 in the direction shown by the arrow. The upper connecting plate 110 is reset to the last position under the backward rotation pulling force of the reset spring 109 or is reset to any gear position under the manual control of the passenger, and the stress on the rotating locking plate-unlocking part 1031 ends. Under the reverse pulling force of the rotating locking plate-reset spring 102, the rotating locking plate 103 is locked with the first paired locking plate 107 again, and the reset locking is completed.

[0106] In order to prevent the rotatable rotating locking plate 103 from being out of gear during the engagement with the first paired locking plate 107, as shown in Figure 17 and Figure 18 , a limiting part 1034, especially a fixed limiting bracket, is provided, both ends of the limiting part 1034 are fixed with the mounting points of the rotating locking plate 103 and the first paired locking plate 107, so as to fix and limit the rotating locking plate 103 and the first paired locking plate 107 in the intermediate relative position, prevent lateral displacement during adjustment, especially during collision, and cause the rotating locking plate 103 and the first paired locking plate 107 to be out of gear.

[0107] In order to realize the advantageous locking and unlocking of the first ratchet structure of the corresponding paired teeth of the first locking part configured as the rotating locking plate 103 and the second locking part configured as the first paired locking plate 107, as shown in Figure 19 , when the rotatable rotating locking plate 103 is engaged with the first paired locking plate 107 and is in a static state, the axis line passing through the movement axis of the rotating locking plate 103 is 90° with the overlapping surface of the first paired locking plate 107, wherein the first paired teeth and the second paired teeth overlap on the overlapping surface. When the angle is greater than 90°, the contact surface will change to a point line contact, resulting in a small friction coefficient, which is not conducive to locking; and when the angle is less than 90°, a negative angle appears, and the locking force is too large, which is not conducive to the unlocking of the rotating locking plate 103 from the first paired locking plate 107. In addition, as shown in Figure 19 , the tooth position is based on the movement axis roundness line of the first paired locking plate 107, and the angle between the teeth is 10°.

[0108] Next, the arrangement structure and action principle of the forward and backward adjustment mechanism, the locking mechanism and the unlocking mechanism of the second embodiment of the manually forward and backward adjustable headrest assembly according to the present disclosure are described with reference to Figures 20 to 30 .

[0109] The rearward adjustment mechanism of the second embodiment of the manually forward and rearward adjustable headrest assembly according to the present disclosure is substantially identical to that of the first embodiment, except for the connection structure for connecting the first locking member of the locking mechanism. Therefore, for the rearward adjustment mechanism, except for the connection structure for connecting the first locking member of the locking mechanism, other structures can refer to the above description.

[0110] In the first embodiment, the first locking member is connected to the corresponding component of the rearward adjustment mechanism as a rotating locking plate 103 through a rotating connection structure, while in the second embodiment, the movement form of the first locking member is changed to translational movement, and thus the connection structure for the first locking member of the rearward adjustment mechanism is also changed accordingly. This will be described in more detail below.

[0111] As Figures 21 to 27In the second embodiment, the unlocking mechanism also comprises the pusher 6 and the unlocking slider 9, the movement of the pusher 6 being able to drive the unlocking slider 9 to move in the same direction. In this embodiment, the pusher 6 and the unlocking slider 9 jointly form the unlocking moving member according to the present disclosure, i.e. in the second embodiment, the unlocking moving member is two-piece structured. Of course, in another embodiment, it is also possible to one-piece structure the pusher 6 and the unlocking slider 9. The unlocking slider 9 has an unlocking slider sliding part 901. In addition, in the second embodiment, the locking mechanism comprises the first locking member structured as the sliding locking plate 118 and the second locking member structured as the second counter locking plate 117. The sliding locking plate 118 also has the first counter tooth part and further comprises the sliding locking plate track 1181 for cooperating with the unlocking moving member of the unlocking mechanism, especially the unlocking slider 9, and the sliding locking plate reset part 1182 for cooperating with the connecting structure of the front-back adjustment mechanism, wherein the sliding locking plate reset part 1182 can slide in the upper connecting plate sliding groove 1104 and can be reset via the slider reset spring 119 connected at one end to the sliding locking plate reset part 1182 and fixed at the other end to the upper connecting plate 110. Of course, it is also possible that the slider reset spring 119 is fixed at the other end to the base when the sliding locking plate 118 is arranged on the base, especially the lower connecting plate 114 of the base. In addition, in the second embodiment, the second counter locking plate 117 also has the second counter tooth part. Except for this, the second counter locking plate 117 is basically the same in structure as the first counter locking plate 107 of the first embodiment. The unlocking slider 9 of the unlocking moving member, especially the unlocking slider sliding part 901 thereof, and the sliding locking plate 118 structured as the first locking member, especially the sliding locking plate track 1181 thereof, cooperate through the second inclined surface structure (i.e. the inclined surface-sliding structure composed of the unlocking slider sliding part 901 and the sliding locking plate track 1181), so that the movement of the unlocking moving member, such as the pusher 6 of the unlocking moving member and thus the unlocking slider 9, in the first direction, especially the transverse direction of the manually front-back adjustable headrest assembly, can drive the sliding locking plate 118 to translate in the other second direction orthogonal to the first direction. The other second direction can be different from the aforementioned second direction. The translational movement in the other second direction should ensure that the sliding locking plate 118 and the second counter locking plate 117 can be disengaged from each other when unlocking is needed.

[0112] As Figure 27As shown, the corresponding mating tooth portions of the sliding locking plate 118 and the second mating locking plate 117 can form a second ratchet structure, and similarly, when the front and rear adjustment mechanism adjusts the headrest cover forward, the second mating locking plate 117 can be moved so that the sliding locking plate 118 translates and its first mating tooth portion and the second mating tooth portion of the second mating locking plate 117 are automatically disengaged from each other. In other words, when the front and rear adjustment mechanism adjusts the headrest cover forward, the sliding locking plate 118 automatically slides out of the unlocked state; when the front and rear adjustment mechanism is adjusted backward in the unlocked state, the sliding locking plate 118 is locked in place. According to specific applications, the second mating tooth portion of the second mating locking plate 117 in the second embodiment can be the same as the second mating tooth portion of the first mating locking plate 107 in the first embodiment, in which case the second mating locking plate 117 and the first mating locking plate 107 are the same component; or the second mating tooth portion of the second mating locking plate 117 in the second embodiment can also be different from the second mating tooth portion of the first mating locking plate 107 in the first embodiment according to the specific structure of the first mating tooth portion of the sliding locking plate 118.

[0113] From Figure 21 and Figures 28 to 30 It can be clearly seen that the button 4 is stressed and thereby moves the pusher 6, which in turn pushes the unlocking slider 9, and the unlocking slider sliding portion 901 is stressed to generate a downwardly inclined pressure and acts on the sliding locking plate track 1181, thereby causing the sliding locking plate 118 to disengage from the second mating locking plate 117, to complete the unlocking of the sliding locking plate 118 and the second mating locking plate 117. When the pushing force applied to the button 4 disappears, the slider return spring 119 causes the sliding locking plate return portion 1182 to reset in the upper connecting plate sliding groove 1104, to lock the sliding locking plate 118 to the second mating locking plate 117.

[0114] Then with the help of Figures 31 to 36 The arrangement and action principle of the structure related to the up and down adjustment mechanism of the third embodiment of the manually front and rear adjustable headrest assembly with a manual front and rear adjustment mechanism and a manual up and down adjustment mechanism according to the present disclosure will be described.

[0115] As Figures 31 to 36As shown, the manually adjustable headrest assembly further comprises an up-down adjustment mechanism 10, which comprises a fixed base 10a and a moving part 10b, wherein the fixed base 10a is connected with the front-back adjustment mechanism, especially the upper connecting plate thereof, and the moving part 10b is connected with the headrest cover, and the moving part 10b can slide up and down relative to the fixed base 10a, so as to realize the up-down adjustment of the headrest cover. In order to realize the locking during the up-down adjustment, a plurality of spaced locking grooves are arranged on the fixed base 10a, and an unlocking moving part of an unlocking wire 10c is configured to cooperate with the locking grooves, wherein when the unlocking wire 10c is engaged with the locking grooves, the up-down adjustment mechanism 10 is limited to adjust the headrest cover; and when the unlocking wire 10c is disengaged from the locking grooves, the up-down adjustment mechanism 10 is allowed to adjust the headrest cover. For the specific structure of the locking grooves, reference can be made to the description of the similar locking grooves in the Chinese patent CN202420598265.5 of the applicant. In addition, the wire in the Chinese patent CN202420598265.5 can be used as the unlocking moving part in the present application.

[0116] As is clear from Figures 33 to 34 , the unlocking wire 10c comprises a protruding moving part 10d, especially a U-shaped protruding moving part 10d, and the movement of the unlocking wire 10c in the first direction drives the protruding moving part 10d to disengage from the locking grooves, and at the same time drives a first locking part also configured as a rotating locking plate 103 to disengage from a second locking part also configured as a first counterpart locking plate 107, so that the up-down adjustment mechanism 10 adjusts the headrest up and down and allows the front-back adjustment mechanism to adjust the headrest backward. For this purpose, an additional rotary transmission part 12 can be provided, which can also convert the movement of the unlocking wire 10c into the rotation of the rotating locking plate 103. In order to realize the reset of the additional rotary transmission part 12, as Figure 32 shown, an additional rotary transmission part-reset torsion spring 11 is also provided. It should be noted that in the Chinese patent CN202420598265.5, the wire is only used to unlock the manual up-down adjustment, and in the present disclosure, a single unlocking wire is innovatively used to unlock two different directions, i.e. not only to unlock the up-down adjustment, but also to unlock the backward adjustment, so that a composite function is realized by using only one single unlocking wire.

[0117] In other aspects, the structure of the third embodiment is basically the same as that of the first embodiment, and therefore reference can be made to the previous description of the corresponding structure of the first embodiment. In addition, it can also be envisaged that the structure of the locking mechanism and the unlocking mechanism and their respective parts can also adopt the scheme in the second embodiment.

[0118] Next, by means of Figure 37a and Figure 37bThe arrangement and the principle of action of the structure of the fourth embodiment of the manually forward and backward adjustable headrest assembly according to the present disclosure with the manual forward and backward adjustment mechanism and the electric up and down adjustment mechanism in relation to the up and down adjustment mechanism are described.

[0119] In order to realize the electric adjustment of the up and down adjustment mechanism 10, in the fourth embodiment, as shown in Figure 37a and Figure 37b , the up and down adjustment mechanism 10 further comprises a second motor assembly, which comprises a second motor 126, a second screw rod rotationally connected with the second motor, and a second nut 14 arranged on the second screw rod, wherein the second motor 126 is fixedly arranged on the forward and backward adjustment mechanism configured as a four-bar linkage assembly 1, for example, through a motor bolt 120, and the forward and backward adjustment mechanism is connected with the fixed base 10a through a screw, so that the second motor 126 is fixedly arranged relative to the fixed base 10a, and the second nut 14 is connected with the moving part 10b, for example, through a gear and rack transmission mechanism, when the second motor 126 drives the second nut 14 to move along the second screw rod, the moving part 10b moves relative to the fixed base 10a. It can also be envisaged that, in an embodiment not shown, the second screw rod motor 126 is fixedly arranged relative to the moving part 10b, for example, directly fixed on the moving part 10b, and the second screw rod nut 14 is connected with the fixed base 10a. In addition, it can also be envisaged that the second nut 14 is fixedly connected with the moving part 10b, in particular, the second nut 14 can be fixed on the moving part 10b through a screw.

[0120] In other aspects, the structure of the fourth embodiment is basically the same as that of the first embodiment, so reference can be made to the previous description of the corresponding structure of the first embodiment. In addition, it can also be envisaged that the structure of the locking mechanism and the unlocking mechanism and their corresponding parts can also adopt the scheme in the second embodiment.

[0121] It is pointed out here that the unlocking moving part is described in the present disclosure by taking the pusher 6 or the pusher 6 and the unlocking slider 9 as an example, and those skilled in the art can also envisage that the unlocking moving part can also be configured as a puller through a certain degree of modification, and the parts related thereto can also be adaptively adjusted in structure to adapt to the pull.

[0122] Next, the arrangement of the forward and backward adjustment mechanism of the first embodiment of the electrically forward and backward adjustable headrest assembly according to the present disclosure and the forward and backward adjustment driving device for the same are described. Figures 38a to 38c As shown in

[0123] , Figure 37a , Figure 37b and Fig. 38, the forward and backward adjustment mechanism of the electrically forward and backward adjustable headrest assembly is basically the same in structure as Figure 1The shown front-rear adjustment mechanism corresponds. In the first embodiment of the electrically adjustable headrest assembly, in the front-rear adjustment mechanism of the electrically adjustable headrest assembly, the front link 105 is fixed by welding at both sides of its upper part with the front link hinge plate 113, and then via the link hinge part of the first pair locking plate 107 with the link hinge part of the front link hinge plate 113 itself with the upper connecting plate 110 to form a rotary pair. The connection relationship of other components of the front-rear adjustment mechanism can be referred to the description of the front-rear adjustment mechanism in the foregoing Figure 1 .

[0124] The front-rear adjustment mechanism of the electrically adjustable headrest assembly is also configured as a four-link assembly, but without a locking mechanism, so it is referred to as another four-link assembly 1' here. The second connection point for connecting the front-rear adjustment drive is provided on the middle connecting part of the front link 105 of the another four-link assembly 1'. The front-rear adjustment drive is configured as a first motor assembly, which is connected with the another four-link assembly 1' as the front-rear adjustment drive on the middle connecting part of the front link 105 as the second connection point. The first motor assembly includes a first motor 124, a first screw rod rotatably connected with the first motor 124, and a first nut 122 provided on the first screw rod, wherein the first motor 124 is pivotably provided on the base, especially the lower connecting plate 114 of the base, and the first nut 122 is indirectly pivotably connected with the middle connecting part of the front link 105 via an intermediate connecting plate 125. Specifically, the front link 105 is fixed by welding with the intermediate connecting plate 125, the first nut 122 (also referred to as a front-rear nut) is fitted into a slot, especially a circular slot, of the intermediate connecting plate 125 to perform a pivoting motion or a rotating motion, and the first motor 124 (also referred to as a front-rear motor) is fixed on the another four-link assembly 1', especially the lower connecting plate 114 of the another four-link assembly 1', by a cradle 123 and can thereby perform a pivoting motion or a rotating motion on the lower connecting plate 114 by a cradle bolt 121. The first motor 124 drives the front link 105 to pivot by the first nut 122 along the normal motion of the screw rod, thereby driving the front-rear adjustment mechanism of the electrically adjustable headrest assembly to perform a front-rear motion.

[0125] In addition to the above-mentioned arrangement for the second connection point, other arrangements for the second connection point can of course also be envisaged. For example, it is envisaged to provide the second connection point on the rear link 108, in which case the first motor 124 can be pivotably provided on the base or the upper connecting plate 110. Alternatively, it is envisaged to provide the second connection point on the base or the upper connecting plate 110, in which case the first motor can be pivotably provided on the front link 105 or the rear link 108.

[0126] Subsequently, by means of Figures 38 to Figure 42The arrangement of a second embodiment of the electrically adjustable headrest assembly according to this disclosure is described. This electrically adjustable headrest assembly according to the second embodiment enables both electrically adjustable fore-and-aft and manually adjustable up-and-down. The arrangement of the fore-and-aft adjustment mechanism of the second embodiment of the electrically adjustable headrest assembly can be referred to the preceding description of the fore-and-aft adjustment mechanism of the first embodiment of the electrically adjustable headrest assembly.

[0127] The electrically adjustable headrest assembly in its second embodiment also includes a height adjustment mechanism 10. Here, the height adjustment mechanism 10 is also fastened to the additional four-bar assembly 1' by screws. The arrangement and operating principle of the height adjustment mechanism 10 can be basically referred to in the preceding description of the height adjustment mechanism in the third embodiment of the manually adjustable headrest assembly, except that in the third embodiment of the manually adjustable headrest assembly, the unlocking moving member, configured as an unlocking wire, unlocks not only the manual height adjustment but also the manual front-back adjustment, while in the second embodiment of the electrically adjustable headrest assembly, the height adjustment unlocking member is only used to unlock the manual height adjustment. This height adjustment unlocking member can also be configured as an unlocking wire. Therefore, in the second embodiment of the electrically adjustable headrest assembly, there is no pivot or related components or structures.

[0128] Here, in comparison Figure 41 and Figure 42 It can be clearly seen that the retracted state of the front and rear adjustment mechanism is under the driving action of the first motor assembly used for the front and rear adjustment mechanism. Figure 41 ) and unfolded state ( Figure 42 ).

[0129] Finally, by using Figures 43 to 45 The arrangement of a third embodiment of the electrically adjustable headrest assembly according to this disclosure is described. This electrically adjustable headrest assembly according to the third embodiment enables both electrically adjustable fore-and-aft and electrically adjustable up-and-down movements. The arrangement of the fore-and-aft adjustment mechanism of the third embodiment of the electrically adjustable headrest assembly can be referred to the preceding description of the fore-and-aft adjustment mechanism of the first embodiment of the electrically adjustable headrest assembly.

[0130] The electrically adjustable headrest assembly in its third embodiment also comprises an up-down adjustment mechanism 10, which comprises a fixed base 10a and a moving part 10b, wherein the fixed base 10a is connected with the front-rear adjustment mechanism, especially the upper connecting plate 107 thereof, and the moving part 10b is connected with the headrest cover, and the moving part 10b can slide up and down relative to the fixed base 10a, so as to realize the up-down adjustment of the headrest cover. In order to realize the electric up-down adjustment, the up-down adjustment mechanism 10 further comprises a second motor assembly, which comprises a second motor 126, a second screw rod connected with the second motor 126 in rotation, and a second nut 14 arranged on the second screw rod, wherein the second motor 126 is arranged on the front-rear adjustment mechanism configured as the another four-bar linkage assembly 1’ for example by means of a motor bolt 120, and the front-rear adjustment mechanism is connected with the fixed base 10a by means of screws, and the second nut 14 is connected with the moving part 10b, especially fixedly connected, and when the second motor 126 drives the second nut 14 to move along the second screw rod, the moving part 10b moves relative to the fixed base 10a. Specifically, the motor bolt 120 for the second motor 126 (also referred to as up-down motor) is connected with the second motor 126 through the another four-bar linkage assembly 1’, which is fixed to the fixed base 10a, such as the fixed rack component, by means of screws, and the second nut 14 (also referred to as up-down nut) is fixed to the moving part 10b by means of screws. Thus, the up-down adjustment mechanism can be driven by the second motor 126 to move up and down. Here, it is also conceivable that the second nut 14 and the moving part 10b are indirectly connected through a gear-rack transmission mechanism.

[0131] It is to be noted that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. In the description of the figures, like numbers refer to like elements throughout.

[0132] The thicknesses of the elements in the figures can be exaggerated for clarity. It will be understood that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.).

[0133] The terms "top," "bottom," "over," "under," "upper," "lower," and the like in reference to a feature being on top of, or under, another feature, as used herein, are intended to be relative terms in relation to the other feature.

[0134] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It is to be understood that the terms "comprising," "including," and "having" can be used interchangeably in this disclosure.

[0135] It is also to be understood that all the exemplary embodiments disclosed herein can be combined arbitrarily. In addition, all the individual technical features in the present application can be combined arbitrarily, as long as the technical features to be combined are not contradictory to each other. All technically feasible combinations are included in the technical content of the present application.

[0136] Finally, it is to be pointed out that the above-described embodiments are merely for the purpose of understanding the present disclosure and do not constitute a limitation on the scope of protection of the present disclosure. Modifications can be made by those skilled in the art based on the above-described embodiments, and these modifications do not depart from the scope of protection of the present disclosure.

Claims

1. A fore-aft adjustment mechanism for fore-aft adjustment of a headrest cover of a vehicle seat, characterized by, The first connection point is used to connect a locking mechanism which only locks the rearward adjustment when the seat is manually adjusted, and the second connection point is used to connect the front and rear adjustment driving device.

2. The fore-aft adjustment mechanism of claim 1, wherein The front and rear adjustment mechanism comprises a base which is connected to the backrest of the seat, an upper connecting plate which is connected to the headrest cover or the fixed base of the up and down adjustment mechanism, and front and rear connecting rods which are respectively hinged or hingeable to the base and the upper connecting plate, thereby forming a plurality of hinge points.

3. The fore-aft adjustment mechanism of claim 2, wherein, The first connection point is located at or near any one of the plurality of hinge points, and the second connection point is located on the main body of the front connecting rod, the rear connecting rod, the base or the upper connecting plate.

4. The fore-aft adjustment mechanism of claim 3, wherein The front connecting rod is configured in a U shape, comprising two side legs and a middle connecting portion connecting the two side legs.

5. The fore-aft adjustment mechanism of claim 4, wherein, The second connection point is located on the middle connecting portion of the U-shaped front connecting rod.

6. The fore-aft adjustment mechanism of claim 2, wherein, The front connecting rod is configured as a hollow tubular profile.

7. A manually fore-aft adjustable headrest assembly characterized by, The front and rear adjustment mechanism according to any one of claims 1 to 6, and a locking mechanism and an unlocking mechanism for locking the rearward adjustment movement of the front and rear adjustment mechanism, wherein the locking mechanism is connected to the front and rear adjustment mechanism at the first connection point.

8. The manually adjustable fore-aft headrest assembly of claim 7, wherein, The locking mechanism is configured to not lock the forward adjustment movement of the front and rear adjustment mechanism to allow the front and rear adjustment mechanism to adjust the headrest cover forward, and to lock the rearward adjustment movement of the front and rear adjustment mechanism to limit the front and rear adjustment mechanism to adjust the headrest cover rearward; The unlocking mechanism cooperates with the locking mechanism and is configured to unlock the locking of the locking mechanism when the front and rear adjustment mechanism adjusts the headrest cover rearward, so that the front and rear adjustment mechanism can adjust the headrest cover rearward.

9. A manually adjustable fore-aft headrest assembly as claimed in claim 8, wherein, The locking mechanism comprises a first locking member and a second locking member, wherein the first locking member is resettable engaged with the second locking member, and when the front and rear adjustment mechanism adjusts the headrest cover forward, the second locking member is moved to disengage from the first locking member, thereby allowing the front and rear adjustment mechanism to adjust the headrest cover forward; and when the front and rear adjustment mechanism adjusts the headrest cover rearward, the first locking member is moved by the unlocking mechanism to disengage from the second locking member, thereby allowing the front and rear adjustment mechanism to adjust the headrest cover rearward.

10. The manually adjustable fore-aft headrest assembly of claim 9, wherein, One end of the first locking member is provided with a first mating tooth portion, and the second locking member has a second mating tooth portion, which are configured such that the forward adjustment movement of the front and rear adjustment mechanism can move the second locking member, so that the first mating tooth portion and the second mating tooth portion disengage from each other, thereby allowing the front and rear adjustment mechanism to adjust the headrest cover forward; and the rearward adjustment movement of the front and rear adjustment mechanism makes the first mating tooth portion and the second mating tooth portion remain engaged, thereby limiting the front and rear adjustment mechanism to adjust the headrest cover rearward. One end of the first locking member is provided with a first mating tooth portion, and the second locking member has a second mating tooth portion, which are configured such that the forward adjustment movement of the front and rear adjustment mechanism can move the second locking member, so that the first mating tooth portion and the second mating tooth portion disengage from each other, thereby allowing the front and rear adjustment mechanism to adjust the headrest cover forward; and the rearward adjustment movement of the front and rear adjustment mechanism makes the first mating tooth portion and the second mating tooth portion remain engaged, thereby limiting the front and rear adjustment mechanism to adjust the headrest cover rearward.

11. The manually adjustable fore-aft headrest assembly of claim 10, wherein, The unlocking mechanism comprises an unlocking moving part, movement of the unlocking moving part in a first direction can drive the first locking part to move, so that the first locking part is disengaged from the second locking part, thereby allowing the forward and backward adjusting mechanism to adjust the headrest rearward.

12. The manually adjustable fore-aft headrest assembly of claim 11, wherein, The unlocking mechanism further comprises an intermediate transmission part cooperating with the first locking part, movement of the unlocking moving part in the first direction can drive the intermediate transmission part to move, thereby driving the first locking part to rotate.

13. The manually adjustable fore-aft headrest assembly of claim 12, wherein: Movement of the unlocking moving part in the first direction can drive the intermediate transmission part to rotate, thereby driving the first locking part to rotate.

14. The manually adjustable fore-aft headrest assembly of claim 13, wherein, The intermediate transmission part comprises a rotating shaft extending in a vertical direction, and a first extension and a second extension disposed on the rotating shaft for cooperating with the unlocking moving part and the first locking part respectively, so that movement of the unlocking moving part in the first direction drives the rotating shaft to rotate through the first extension, and then the second extension drives the first locking part to rotate around a first rotating axis extending in the first direction.

15. The manually adjustable fore-aft headrest assembly of claim 12, wherein: Movement of the unlocking moving part in the first direction can drive the intermediate transmission part to translate, thereby driving the first locking part to rotate.

16. A manually adjustable fore-aft headrest assembly as claimed in claim 15, wherein: The unlocking moving part cooperates with the intermediate transmission part through a first inclined surface structure, so that movement of the unlocking moving part in the first direction can drive the intermediate transmission part to translate in a second direction orthogonal to the first direction, wherein translation of the intermediate transmission part in the second direction promotes the first locking part to rotate.

17. The manually adjustable fore-aft headrest assembly of claim 12, wherein, The rotatable first locking part has a protruding hook-shaped part as the first mating tooth part, the shape of the hook-shaped part and the shape of the second mating tooth part of the second locking part are designed such that the first mating tooth part of the rotatable first locking part and the second mating tooth part of the second locking part constitute a first ratchet structure, and when the forward and backward adjusting mechanism adjusts the headrest cover body forward, the second locking part can be driven to move, so that the first locking part rotates and the hook-shaped part and the second mating tooth part automatically disengage from each other.

18. The manually adjustable fore-aft headrest assembly of claim 11, wherein, Movement of the unlocking moving part in the first direction can drive the first locking part to translate.

19. A manually adjustable fore-aft headrest assembly according to claim 18, wherein, The unlocking moving part cooperates with the first locking part through a second inclined surface structure, so that movement of the unlocking moving part in the first direction can drive the first locking part to translate in another second direction orthogonal to the first direction.

20. The manually adjustable fore-aft headrest assembly of claim 18, wherein, The first mating tooth part of the translatable first locking part and the second mating tooth part of the second locking part constitute a second ratchet structure, and when the forward and backward adjusting mechanism adjusts the headrest cover body forward, the second locking part can be driven to move, so that the first locking part translates and the first mating tooth part and the second mating tooth part automatically disengage from each other.

21. The manually adjustable fore-aft headrest assembly of claim 11, wherein, The manually forward and backward adjustable headrest assembly further comprises an up and down adjusting mechanism, the up and down adjusting mechanism comprises a moving part and a fixed base, wherein the fixed base is connected with the forward and backward adjusting mechanism, the moving part is connected with the headrest cover body, and the moving part can slide up and down relative to the fixed base, thereby realizing up and down adjustment of the headrest cover body.

22. A manually adjustable fore-aft headrest assembly as claimed in claim 21, wherein: A plurality of spaced locking grooves are provided on the fixed base, and the unlocking moving part cooperates with the locking grooves as an up and down adjusting unlocking part, wherein when the unlocking moving part is engaged with the locking grooves, the up and down adjusting mechanism is limited to adjust the headrest cover body; and when the unlocking moving part is disengaged from the locking grooves, the up and down adjusting mechanism is allowed to adjust the headrest cover body.

23. A manually adjustable fore-aft headrest assembly as claimed in claim 22, wherein: The unlocking moving part includes a protruding moving part, movement of the unlocking moving part in the first direction causes the protruding moving part to disengage from the locking groove, and simultaneously causes the first locking part to move to disengage from the second locking part, thereby allowing the up-down adjusting mechanism to adjust the headrest up and down and allowing the front-rear adjusting mechanism to adjust the headrest rearward.

24. A manually adjustable fore-aft headrest assembly as recited in claim 21, wherein, The up-down adjusting mechanism further includes a second motor assembly, the second motor assembly including a second motor, a second screw rod rotationally connected to the second motor, and a second nut disposed on the second screw rod, wherein the second motor is fixed relative to one of the fixed base and the moving part, and the second nut is in action connection with the other one of the fixed base and the moving part, and when the second motor drives the second nut to move along the second screw rod, the moving part moves relative to the fixed base.

25. A manually adjustable fore-aft headrest assembly as claimed in claim 10, wherein, The second locking part is disposed on one of the front link and the rear link, such that the second matching tooth portion is close to any one of the plurality of hinge points, wherein when the second matching tooth portion is close to the upper hinge point, the first locking part is movably disposed on the upper connecting plate; and when the second matching tooth portion is close to the lower hinge point, the first locking part is movably disposed on the base.

26. A manually adjustable fore-aft headrest assembly according to claim 25, wherein, The second locking part further has a link hinge portion for hingedly connecting the front link with the upper connecting plate, wherein the second locking part is disposed on a side area of the intermediate connecting portion of the front link.

27. A manually adjustable fore-aft headrest assembly as claimed in claim 25, wherein: The second locking part has a protruding portion extending in its transverse direction from the side, for increasing the connection area of the second locking part with the front link.

28. A manually adjustable fore-aft headrest assembly as claimed in claim 25, wherein: A limiting part is disposed on the side of the first locking part away from the upper connecting plate or the base, the limiting part being configured to limit the lateral movement of the first locking part to prevent the first matching tooth portion from disengaging from the second matching tooth portion.

29. A manually adjustable fore-aft headrest assembly as recited in claim 25, wherein: When the first locking part is configured to be slidable, the first locking part is slidably disposed on the upper connecting plate or the base by a sliding groove type sliding structure.

30. A manually adjustable fore-aft headrest assembly as claimed in claim 11, wherein, The unlocking moving part includes or is configured as a pushing part, wherein pushing of the pushing part in the first direction can cause the first locking part to move.

31. An electrically adjustable fore-aft headrest assembly, characterized by, The front-rear adjusting mechanism according to any one of claims 1 to 6 and a first motor assembly for driving the front-rear adjusting mechanism to perform a front-rear adjusting movement, the first motor assembly being connected to the front-rear adjusting mechanism at the second connecting point as a front-rear adjusting driving device.

32. The electrically power adjustable headrest assembly of claim 31, wherein, The first motor assembly includes a first motor, a first screw rod rotationally connected to the first motor, and a first nut disposed on the first screw rod, wherein the first motor is pivotally disposed on one of the base and the upper connecting plate, and the first nut is pivotally connected to the other one of the front link and the rear link, or the first motor is pivotally disposed on one of the front link and the rear link, and the first nut is pivotally connected to the other one of the base and the upper connecting plate.

33. The electrically power adjustable headrest assembly of claim 32, wherein, The first motor is pivotally disposed on the base, and the first nut is directly or indirectly pivotally connected to the front link via the intermediate connecting plate.

34. The electrically power adjustable headrest assembly of claim 33, wherein, The first nut is pivotally connected to the intermediate connecting portion of the front link.

35. The electrically power adjustable headrest assembly of claim 31, wherein: The electrically adjustable front-rear headrest assembly further comprises an up-down adjusting mechanism, the up-down adjusting mechanism comprising a moving component and a fixed base, wherein the fixed base is connected with the front-rear adjusting mechanism, the moving component is connected with the headrest cover, and the moving component is capable of sliding up and down relative to the fixed base, thereby realizing up-down adjustment of the headrest cover.

36. The electrically power adjustable headrest assembly of claim 35, wherein: A plurality of spaced locking grooves are arranged on the fixed base, and the up-down adjusting mechanism comprises an up-down adjusting unlocking member which cooperates with the locking grooves, wherein when the up-down adjusting unlocking member is engaged with the locking grooves, the up-down adjusting mechanism is restricted from adjusting the headrest cover; and when the up-down adjusting unlocking member is disengaged from the locking grooves, the up-down adjusting mechanism is allowed to adjust the headrest cover.

37. The electrically power adjustable headrest assembly of claim 35, wherein: The up-down adjusting mechanism further comprises a second motor assembly, the second motor assembly comprising a second motor, a second screw rod rotatably connected with the second motor, and a second nut arranged on the second screw rod, wherein the second motor is fixedly arranged relative to one of the fixed base and the moving component, the second nut is actionally connected with the other one of the fixed base and the moving component, and when the second motor drives the second nut to move along the second screw rod, the moving component moves relative to the fixed base.

38. A vehicle seat, characterized by The vehicle seat comprises the manually adjustable front-rear headrest assembly according to any one of claims 7 to 30, or the electrically adjustable front-rear headrest assembly according to claim 31 or 37.

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