Headrest assembly for vehicle seat and vehicle seat

Abstract

The invention relates to a headrest assembly for a vehicle seat. The headrest assembly comprises a front-back adjusting mechanism for adjusting a headrest cover body front and back; the locking mechanism is used for locking the adjusting movement of the front-back adjusting mechanism; the locking mechanism is configured to do not lock forward adjusting movement of the front-back adjusting mechanism so as to allow the front-back adjusting mechanism to adjust the headrest cover body forwards, and lock backward adjusting movement of the front-back adjusting mechanism so as to limit the front-back adjusting mechanism to adjust the headrest cover body backwards; the unlocking mechanism is matched with the locking mechanism, and the unlocking mechanism is configured to be used for unlocking locking of the locking mechanism when the front-back adjusting mechanism backwards adjusts the headrest cover body, so that the front-back adjusting mechanism can backwards adjust the headrest cover body. The present disclosure also relates to a vehicle seat including such a headrest assembly.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicles, and more particularly to a headrest assembly for a vehicle seat and a vehicle seat including the headrest assembly. Background Art

[0002] In the design of car seats, the adjustment function of the headrest is one of the key factors to improve comfort and safety. In the traditional headrest adjustment mechanism, when subjected to a forward impact, due to inertia, the headrest may move to the frontmost position and unlock, and then automatically return to the rearmost position. This situation may reduce the safety of the seat because the headrest may not provide sufficient support after the impact, increasing the risk of injury to the passenger. Therefore, designing a headrest adjustment mechanism that can be adjusted forward without unlocking, but only needs to be unlocked when adjusting backward, is of great significance to improving the safety and reliability of car seats. Summary of the invention

[0003] The purpose of the present disclosure is to provide a headrest assembly for a vehicle seat and a vehicle seat including such a headrest assembly, wherein the headrest assembly according to the present disclosure can realize the function of not requiring unlocking when adjusting forward but requiring unlocking when adjusting backward.

[0004] To this end, a first aspect of the present disclosure relates to a headrest assembly for a vehicle seat, comprising: a fore-and-aft adjustment mechanism for adjusting a headrest cover body forward and backward; a locking mechanism for locking the adjustment movement of the fore-and-aft adjustment mechanism; and an unlocking structure, characterized in that the locking mechanism is configured not to lock the forward adjustment movement of the fore-and-aft adjustment mechanism thereby allowing the fore-and-aft adjustment mechanism to adjust the headrest cover body forward, but to lock the rearward adjustment movement of the fore-and-aft adjustment mechanism thereby limiting the fore-and-aft adjustment mechanism from adjusting the headrest cover body rearward; the unlocking mechanism cooperates with the locking mechanism and the unlocking mechanism is configured to unlock the lock of the locking mechanism when the fore-and-aft adjustment mechanism adjusts the headrest cover body rearward, so that the fore-and-aft adjustment mechanism can adjust the headrest cover body rearward.

[0005] Through the headrest assembly for a vehicle seat according to the present disclosure, a unique one-way locking design concept is used to achieve the function of not needing to unlock when adjusting forward, but only needing to unlock when adjusting backward. This one-way locking design concept can avoid the problem of self-unlocking and returning to the rearmost position after moving to the frontmost position due to inertia after a forward impact, thereby improving the safety of the seat. As a result, the stability of the seat headrest during a forward impact is improved, and the risk of passenger injury caused by the movement of the headrest is reduced. In addition, the adjustment process of the headrest is simplified, and the user can conveniently adjust the headrest backward when necessary without worrying about safety issues when adjusting forward. In addition, the overall safety and reliability of the seat are enhanced, providing users with a more secure driving experience. In other words, this design not only improves the safety of the headrest assembly, but also provides users with a more convenient use experience.

[0006] In some embodiments, the locking mechanism includes a first locking member and a second locking member, wherein the first locking member can be re-engaged with the second locking member, and when the front-rear adjustment mechanism adjusts the headrest cover forward, the second locking member can be driven to move to disengage from the first locking member, thereby allowing the front-rear adjustment mechanism to adjust the headrest cover forward; when the front-rear adjustment mechanism adjusts the headrest cover backward, the first locking member can be driven to move to disengage from the second locking member through the unlocking mechanism, thereby allowing the front-rear adjustment mechanism to adjust the headrest cover backward. Thus, a favorable and reliable locking mechanism can be obtained.

[0007] In some embodiments, a first matching tooth portion is provided at one end of the first locking member, and the second locking member has a second matching tooth portion, and the first matching tooth portion and the second matching tooth portion are configured so that the forward adjustment movement of the front-back adjustment mechanism can drive the movement of the second locking member, so that the second matching tooth portion and the first matching tooth portion are automatically disengaged from each other, thereby allowing the front-back adjustment mechanism to adjust the headrest cover forward; and the backward adjustment movement of the front-back adjustment mechanism keeps the first matching tooth portion engaged with the second matching tooth portion, thereby limiting the front-back adjustment mechanism from adjusting the headrest cover backward. Thus, a hierarchically 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 to a desired stable position as needed.

[0008] In some embodiments, the unlocking mechanism includes an unlocking movable member, and the movement of the unlocking movable member in a first direction can drive the first locking member to move so that the first locking member is disengaged from the second locking member, thereby allowing the front and rear adjustment mechanism to adjust the headrest backward. In this way, convenient unlocking can be achieved, and the occupant can unlock by simply pushing or pulling the unlocking movable member.

[0009] In some embodiments, the first locking member is configured to rotate about a first rotation axis extending in a first direction, and the unlocking mechanism further includes an intermediate transmission member cooperating with the first locking member, and the movement of the unlocking movable member in the first direction can drive the intermediate transmission member to move, and then drive the first locking member to rotate. By providing the intermediate transmission member, the movement of the unlocking movable member can be advantageously converted into other forms of movement of the first locking member.

[0010] In some embodiments, the movement of the unlocking movable member along the first direction can drive the intermediate transmission member to rotate, thereby driving the first locking member to rotate. Thus, the movement of the unlocking movable member can be advantageously converted into the rotation of the first locking member via the rotation of the intermediate transmission member.

[0011] In some embodiments, the intermediate transmission member includes a rotating shaft extending in a vertical direction, and a first extension portion and a second extension portion provided on the rotating shaft for respectively cooperating with the unlocking movable member and the first locking member, so that the movement of the unlocking movable member in a first direction drives the rotating shaft to rotate through the first extension portion, and then the second extension portion drives the first locking member to rotate around a first rotation axis extending in the first direction. Thus, a favorable intermediate transmission member structure can be provided, which can realize reliable motion transmission.

[0012] In some embodiments, the movement of the unlocking movable member along the first direction can drive the intermediate transmission member to translate, thereby driving the first locking member to rotate. Thus, the movement of the unlocking movable member can be advantageously converted into the rotation of the first locking member via the translation of the intermediate transmission member.

[0013] In some embodiments, the unlocking moving member cooperates with the intermediate transmission member through a first inclined surface structure, so that the movement of the unlocking moving member along the first direction can drive the intermediate transmission member to translate along a second direction orthogonal to the first direction, wherein the translation of the intermediate transmission member along the second direction causes the first locking member to rotate. Thus, the conversion of the movement of the unlocking moving member to the translation of the intermediate transmission member can be achieved by simply setting the first inclined surface structure, and such an inclined surface structure can achieve robust motion conversion.

[0014] In some embodiments, the rotatable first locking member has a protruding hook-shaped portion as the first matching tooth portion, and the shape of the hook-shaped portion and the shape of the second matching tooth portion of the second locking member are designed so that the first matching tooth portion of the rotatable first locking member and the second matching tooth portion of the second locking member constitute a first ratchet structure, and when the front-back adjustment mechanism adjusts the headrest cover forward, the second locking member can be driven to move, so that the first locking member rotates and its hook-shaped portion and the second matching tooth portion automatically disengage from each other. Thus, a reliable one-way locking function can be achieved through the first ratchet structure.

[0015] In some embodiments, the movement of the unlocking movable member along the first direction can drive the first locking member to translate, thereby achieving favorable motion transmission from the unlocking movable member to the first locking member, thereby achieving robust motion transmission.

[0016] In some embodiments, the unlocking movable member cooperates with the first locking member through a second inclined surface structure, so that the movement of the unlocking movable member along the first direction can drive the first locking member to translate along another second direction orthogonal to the first direction. Thus, the conversion of the movement of the unlocking movable member to the translation of the first locking member can be achieved by simply setting the second inclined surface structure, and such an inclined surface structure can achieve robust motion conversion.

[0017] In some embodiments, the unlocking movable member is constructed in two parts and includes an unlocking slider, and one of the second inclined surfaces is constructed as a slider sliding portion on the unlocking slider. Thus, the operating part and the motion conversion part of the unlocking movable member can be separately arranged, so that the two unlocking movable members for movement-translation conversion and movement-rotation conversion can share their operating parts and thus save costs.

[0018] In some embodiments, the first matching tooth portion of the first locking member that can be translated and the second matching tooth portion of the second locking member constitute a second ratchet structure, and when the front-back adjustment mechanism adjusts the headrest cover forward, the second locking member can be driven to move, so that the first locking member translates and its first matching tooth portion and the second matching tooth portion automatically disengage from each other. Thus, a reliable one-way locking function can be achieved through the second ratchet structure.

[0019] In some embodiments, the headrest assembly further includes an up-and-down adjustment mechanism, which includes a moving component and a fixed base, wherein the fixed base is connected to the front-and-back adjustment mechanism, the moving component is connected to the headrest cover, and the moving component can slide up and down relative to the fixed base, thereby achieving up-and-down adjustment of the headrest cover. In this way, the up-and-down adjustment function of the headrest cover can be provided in addition to the front-and-back adjustment function.

[0020] In some embodiments, a plurality of locking grooves are arranged at intervals on the fixed base, and the unlocking movable member cooperates with the locking grooves, wherein when the unlocking movable member is engaged with the locking grooves, the up-down adjustment mechanism is restricted from adjusting the headrest cover; and when the unlocking movable member is disengaged from the locking grooves, the up-down adjustment mechanism is allowed to adjust the headrest cover. Thus, the same unlocking movable member can be used to achieve simultaneous unlocking of the rearward adjustment and the up-down adjustment of the headrest cover.

[0021] In some embodiments, the unlocking movable member includes a protruding movable portion, and the movement of the unlocking movable member along the first direction drives the protruding movable portion to disengage from the locking groove, and simultaneously drives the first locking member to move to disengage from the second locking member, thereby allowing the up-down adjustment mechanism to adjust the headrest up-down and allowing the front-back adjustment mechanism to adjust the headrest backward. The protruding movable portion can be configured as a U-shaped portion, for example. Thus, the headrest cover can be advantageously unlocked while adjusting backward and up-down by means of the protruding movable portion of the unlocking movable member.

[0022] In some embodiments, the up and down adjustment mechanism also includes a motor assembly, the motor assembly includes a motor, a screw rod rotatably connected to the motor, and a nut arranged on the screw rod, wherein the motor is fixedly arranged relative to a fixed base and a moving part, and the nut is operatively connected to the fixed base and the other of the moving parts, and when the motor drives the nut to move along the screw rod, the moving part moves relative to the fixed base. Thereby, an advantageous automatic up and down adjustment based on the motor can be achieved. In the present disclosure, "operative connection" means that the second nut can be fixedly connected to the corresponding part, or connected through a transmission mechanism.

[0023] In some embodiments, the front-to-back adjustment mechanism includes: a base connected to the backrest of the seat; an upper connecting plate connected to the fixed base; and a front link and a rear link respectively hinged to the base and the upper connecting plate. Thus, a four-link assembly for front-to-back adjustment and up-down adjustment functions can be advantageously provided.

[0024] In some embodiments, the fore-aft adjustment mechanism includes: a base connected to the backrest of the seat; an upper connecting plate connected to the headrest cover; and a front link and a rear link respectively hinged to the base and the upper connecting plate, thereby forming a plurality of hinge points. Thus, a four-link assembly for the fore-aft adjustment function can be advantageously provided.

[0025] In some embodiments, the second locking member is disposed on one of the front link and the rear link, so 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 member 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 member is movably disposed on the base. Thus, the first locking member and the second locking member can be advantageously disposed on corresponding components of the four-bar linkage assembly according to requirements.

[0026] In some embodiments, the front link is constructed as a hollow tubular profile. Thus, a stable front link structure can be provided. Compared with a conventional sheet or plate type front link, a front link constructed as a tubular profile has a larger cross-sectional moment of inertia, thereby being better able to resist deformation.

[0027] In some embodiments, the front connecting rod is configured in a U shape, and the front connecting rod includes two side legs and a middle connecting portion connecting the two side legs. As a result, sufficient installation space can be left in the middle of the front railing, leaving enough space for the arrangement and installation of possible other components. In addition, compared with two separately arranged front connecting rods, this U-shaped structure with a middle connecting portion has better structural strength and rigidity, can withstand greater forces and is less prone to deformation. In addition, a more stable front and rear adjustment process can be provided. In addition, the U-shaped structure is also more convenient in terms of molding, especially for tubular profiles, the U-shaped structure can be advantageously obtained by bending molding.

[0028] In some embodiments, the second locking member further has a connecting rod hinge portion for hingedly connecting the front connecting rod to the upper connecting plate, wherein the second locking member is arranged on the side area of ​​the middle connecting portion of the front connecting rod. Thus, the second locking member not only assumes the locking function, but also assumes the hinge function of the front connecting rod and other parts of the four-bar linkage assembly, thereby fully utilizing the second locking member. In addition, this is also compatible with the U-shaped structure of the front connecting rod. Since the second locking member additionally assumes the hinge function, it is not necessary to additionally provide a connecting rod hinge portion on the U-shaped front connecting rod, which is conducive to the manufacture of the U-shaped front connecting rod.

[0029] In some embodiments, the second locking member has a protrusion extending from the side along the transverse direction thereof, so as to increase the connection area between the second locking member and the front connecting rod, thereby achieving a more secure connection of the second locking member to the front connecting rod.

[0030] In some embodiments, a limiting member is provided on a side of the first locking member that is away from the upper connecting plate or the base, and the limiting member is configured to limit the lateral movement of the first locking member to prevent the first matching tooth portion from being disengaged from the second matching tooth portion. Thus, a simple limiting member can be used to prevent the first matching tooth portion from being disengaged from the second matching tooth portion.

[0031] In some embodiments, when the first locking member is configured to be slidable, the first locking member is slidably disposed on the upper connecting plate or the base via a sliding groove sliding structure, thereby achieving an advantageous and robust sliding fit between the first locking member and the upper connecting plate or the base.

[0032] In some embodiments, the unlocking movable member includes or is configured as a pusher, wherein the first locking member can be driven to move by pushing the pusher along the first direction. Thus, in the case of a pusher, the occupant can intuitively unlock the vehicle by pushing the pusher. In addition, in the case of a pusher, the design of other matching components related thereto is also simpler.

[0033] A second aspect of the present disclosure relates to a vehicle seat, comprising a headrest assembly according to any one embodiment of the present disclosure.

[0034] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown separately in the drawings can be combined with each other arbitrarily, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present disclosure is further explained below by means of exemplary embodiments with reference to the schematic drawings.

[0036] in:

[0037] Figure 1 Schematic diagrams showing a first embodiment of a headrest assembly according to the present disclosure in different positions when adjusted forward in a state of being mounted on a seat frame.

[0038] Figure 2 A schematic perspective view from the side front shows a front-rear adjustment mechanism configured as a four-link assembly with a locking mechanism according to a first embodiment of a headrest assembly of the present disclosure.

[0039] Figure 3 Show according to Figure 2 A schematic perspective view of a front and rear adjustment mechanism with a locking mechanism as viewed from the side and rear.

[0040] Figure 4 Show according to Figure 2 Schematic exploded view of the front and rear adjustment mechanism with locking mechanism.

[0041] Figure 5 A schematic perspective view of a first embodiment of a headrest assembly according to the present disclosure is shown.

[0042] Figure 6 Show Figure 5 Schematic exploded view of the headrest assembly in .

[0043] Figure 7 Show Figure 5 A top sectional view of a partial portion of a headrest assembly in which the button of the unlocking mechanism is not operated.

[0044] Figure 8 Show Figure 7 Another cross-sectional view of a partial portion of the headrest assembly in a top view, wherein a button of the unlocking mechanism is manipulated and an unlocking moving member configured as a pushing member moves.

[0045] Fig. 9 A schematic perspective view is shown of an unlocking mechanism and a locking mechanism of a first embodiment of a headrest assembly according to the present disclosure, wherein the locking mechanism is in a locked state.

[0046] Fig.10 Show Fig. 9 Another schematic perspective view of the unlocking mechanism and the locking mechanism in FIG. 1 , wherein the locking mechanism is in the unlocked state.

[0047] Fig.11 A schematic perspective view showing a partial portion of a first embodiment of a headrest assembly according to the present disclosure is shown.

[0048] Figure 12 to Figure 14 Schematic diagrams showing different states of the front-rear adjustment mechanism with a locking mechanism when adjusting forward according to the first embodiment of the headrest assembly of the present disclosure.

[0049] Figures 15 to 17 Schematic diagrams showing different states of the front-rear adjustment mechanism with a locking mechanism of the first embodiment of the headrest assembly according to the present disclosure when unlocked and adjusted rearward.

[0050] Fig.18 A schematic detailed view shows a stopper for at least limiting the lateral movement of the first locking member and an arrangement structure of the first locking member and the second locking member.

[0051] Fig.19 A schematic diagram showing an engagement structure of a locking mechanism of a first embodiment of a headrest assembly according to the present disclosure.

[0052] Fig. 20 A schematic perspective view showing a partial portion of a second embodiment of a headrest assembly according to the present disclosure is shown.

[0053] Fig.21 Show Fig. 20 Schematic exploded view of a partial portion of a second embodiment of a headrest assembly.

[0054] Fig. 22 and Fig.23 Schematic perspective views showing a first locking member configured as a sliding locking plate of a locking mechanism according to a second embodiment of a headrest assembly of the present disclosure from different angles.

[0055] Fig.24 and Fig.25 Schematic perspective views of an unlocking slider of an unlocking mechanism of a second embodiment of a headrest assembly according to the present disclosure, viewed from different angles, are respectively shown.

[0056] Fig.26A schematic perspective view showing the cooperation structure between an unlocking slider and a sliding locking plate according to a second embodiment of a headrest assembly of the present disclosure.

[0057] Fig. 27 A schematic diagram showing an engagement structure of a locking mechanism of a second embodiment of a headrest assembly according to the present disclosure.

[0058] Fig.28 A schematic perspective view showing a partial portion of a second embodiment of a headrest assembly according to the present disclosure, wherein a locking mechanism is in a locked state.

[0059] Fig.29 Show Fig.28 Another schematic perspective view of a partial portion of the , wherein the locking mechanism is in an unlocked state.

[0060] Fig.30 Show Fig.28 A schematic perspective view of a partial part of the device as viewed from another angle.

[0061] Fig.31 A schematic perspective view of a third embodiment of a headrest assembly according to the present disclosure is shown with a fore-and-aft adjustment mechanism and a manual up-and-down adjustment mechanism, wherein the fore-and-aft adjustment mechanism is provided with a locking mechanism.

[0062] Fig.32 Show Fig.31 A schematic exploded view of the front and rear adjustment mechanism, the up and down adjustment mechanism and the unlocking mechanism, wherein the front and rear adjustment mechanism has a locking mechanism.

[0063] Fig.33 A schematic perspective view showing an unlocking mechanism and a locking mechanism of a third embodiment of a headrest assembly according to the present disclosure, wherein the locking mechanism is in a locked state.

[0064] Fig.34 Show Fig.33 Another schematic perspective view of the unlocking mechanism and the locking mechanism in FIG. 1 , wherein the locking mechanism is in the unlocked state.

[0065] Fig.35 Show Fig.33 A schematic cross-sectional view from above of a partial portion of the unlocking mechanism and the locking mechanism in FIG.

[0066] Fig.36 Show Fig.34 A schematic cross-sectional view from above of a partial portion of the unlocking mechanism and the locking mechanism in FIG.

[0067] Fig.37 A schematic perspective view of a fourth embodiment of a headrest assembly with a front-rear adjustment mechanism and an electric up-and-down adjustment mechanism according to the present disclosure is shown, wherein a fixing base of the up-and-down adjustment mechanism is omitted for clarity.

[0068] Fig.38 A schematic exploded view of a fourth embodiment of a headrest assembly with a front-to-rear adjustment mechanism and an electric up-and-down adjustment mechanism according to the present disclosure is shown. DETAILED DESCRIPTION

[0069] First, with the help of Figure 1 The overall concept of the headrest assembly for a vehicle seat according to the present disclosure is described. In the present disclosure, the headrest assembly at least includes a front and rear adjustment mechanism for adjusting the headrest cover body having a front cover 2 and a rear cover 3, wherein the front and rear adjustment mechanism is constructed as a four-link assembly 1, and the rear portion of the four-link assembly 1 is fixed to a seat frame 100. Figure 1 The working principle of the headrest assembly according to the present disclosure when adjusting forward (including collision conditions) is described in the specification. The function of not needing to unlock when adjusting forward and only needing to unlock when adjusting backward is achieved by means of a one-way locking design concept, wherein the headrest assembly can be adjusted without unlocking when adjusting forward, and Figure 1 In the most forward position shown on the far right, the headrest assembly will not automatically unlock as in the prior art; the headrest assembly needs to be unlocked when adjusting backward. In the present disclosure, "adjustment" can be, on the one hand, manual adjustment actively performed by the occupant, and on the other hand, it can also be an adjustment movement caused by inertia during a collision. In order to achieve this one-way locking function, the headrest assembly according to the present disclosure also includes a locking mechanism for locking the adjustment movement of the front and rear adjustment mechanism; and an unlocking structure, wherein the locking mechanism is configured not to lock the forward adjustment movement of the front and rear adjustment mechanism so as to allow the front and rear adjustment mechanism to adjust the headrest cover forward, but to lock the backward adjustment movement of the front and rear adjustment mechanism so as to limit the front and rear adjustment mechanism from adjusting the headrest cover backward, and the unlocking mechanism cooperates with the locking mechanism and the unlocking mechanism is configured to unlock the locking mechanism when the front and rear adjustment mechanism adjusts the headrest cover backward, so that the front and rear adjustment mechanism can adjust the headrest cover backward. By providing the headrest assembly according to the present disclosure, it is possible to avoid the headrest cover from moving to the most forward position ( Figure 1 After that, it will automatically unlock and return to the last position ( Figure 1 in the position shown on the far left of the diagram).

[0070] Next, with the help of Figures 2 to 4 The arrangement structure of the front-rear adjustment mechanism and the locking mechanism of the first embodiment of the headrest assembly according to the present disclosure is described.

[0071] like Figures 2 to 4As shown, the front-to-back adjustment mechanism is generally constructed as a four-link assembly 1. The front-to-back adjustment mechanism mainly includes a base, an upper connecting plate 110, and a front connecting rod 105 and a rear connecting rod 108 respectively hinged to the base and the upper connecting plate 110. The base may include a lower connecting plate 114 and a backrest connecting plate 116 fixedly connected to the lower connecting plate 114, especially welded, wherein the lower connecting plate 114 of the base is hinged to the front connecting rod 105 and the rear connecting rod 108. The upper connecting plate 110 can be used to connect to the headrest cover (for the case of only front-to-back adjustment) or to connect to a component for up-and-down adjustment (for the case of front-to-back adjustment and up-and-down adjustment). Specifically, in the four-link assembly 1, the backrest connecting plate 116 is welded to the lower connecting plate 114 to form a base or a fixed end. The rear connecting rod 108 and the upper connecting plate 110 form a revolving pair through the connecting shaft 112, wherein the rear connecting rod 108 and the connecting shaft 112 are welded and fixed, and return springs 109 are respectively arranged inside the two sides of the rear connecting rod 108, and the return springs 109 are respectively sleeved on the connecting shaft 112 and used to provide resetting assistance when adjusting backward; the lower connecting plate 114 forms a revolving pair with the rear connecting rod 108 and the front connecting rod 105 through the step rivet 101, wherein bushings are respectively sleeved on the step rivet 101. In order to achieve better anti-deformation ability, the front connecting rod 105 is constructed as a hollow tubular profile. The front connecting rod 105 is also constructed in a U shape, and the front connecting rod 105 includes two side legs and a middle connecting portion connecting the two side legs. This U-shaped structure provides a corresponding arrangement space for the screw rod arrangement of the motor for the possible automatic front and rear adjustment function, thereby not occupying the side space of the front connecting rod 105.

[0072] Next, the hinge structure of the front link 105 and the upper connecting plate 110 is described. When the hinge is formed, the corresponding components for the unlocking mechanism are formed at the same time. Figure 3 and Figure 4The unlocking mechanism of the first embodiment is described. The locking mechanism includes a first locking member and a second locking member, wherein the first locking member can be re-engaged with the second locking member, wherein a first matching tooth portion is provided at one end of the first locking member, and the second locking member has a second matching tooth portion, and the first matching tooth portion and the second matching tooth portion are configured so that the forward adjustment movement of the front-back adjustment mechanism can drive the movement of the second locking member, so that the second matching tooth portion and the first matching tooth portion are automatically disengaged from each other, thereby allowing the front-back adjustment mechanism to adjust the headrest cover body forward; and the backward adjustment movement of the front-back adjustment mechanism keeps the first matching tooth portion engaged with the second matching tooth portion, thereby limiting the front-back adjustment mechanism from adjusting the headrest cover body backward. In the unlocking mechanism, the first locking member is configured as a rotary locking plate 103, and the second locking member is configured as a first matching locking plate 107, wherein the rotary locking plate 103 has a rotary locking plate-locking portion 1033 as a first matching tooth portion, and the first matching locking plate 107 has a first matching locking plate-locking tooth 1071 as a second matching tooth portion. In addition, the first matching locking plate 107 also has a connecting rod hinge portion for hingedly connecting the front connecting rod 105 to the upper connecting plate 110. The first matching locking plate 107 can be arranged on the side area of ​​the middle connecting portion of the front connecting rod 105, especially close to the U-shaped structure. The rotatable rotary locking plate 103 and the first matching locking plate 107 constitute a first ratchet structure. To this end, the rotation locking plate-locking portion 1033 of the rotatable rotation locking plate 103 is configured as a protruding hook-shaped portion, and the shape of the hook-shaped portion of the rotatable rotation locking plate 103 and the shape of the first matching locking plate-locking tooth 1071 of the first matching locking plate 107 are designed so that the rotation locking plate-locking portion 1033 of the rotatable rotation locking plate 103 and the first matching locking plate-locking tooth 1071 of the first matching locking plate 107 form a first ratchet structure. When the front-back adjustment mechanism adjusts the headrest cover forward, it can drive the first matching locking plate 107 to move, so that the rotation locking plate 103 rotates and its first matching tooth portion and the second matching tooth portion are disengaged from each other. Here, the rotatable rotation locking plate 103 can be configured in a functionally similar manner to a pawl, and the first matching locking plate 107 can be configured in a functionally similar manner to a ratchet.

[0073] exist Figure 3 and Figure 4In one embodiment of the arrangement structure of the front and rear adjustment mechanism and the locking mechanism of the headrest assembly shown in the figure, the front connecting rod 105 is respectively fixed to the second locking member constructed as the first matching locking plate 107 and the front connecting rod hinge plate 113 on both sides of its upper part by welding, and then the connecting rod hinge part of the first matching locking plate 107 and the connecting rod hinge part of the front connecting rod hinge plate 113 and the upper connecting plate 110 are connected to form a rotating pair through the step rivet 101, wherein the corresponding step rivets 101 are also respectively sleeved with bushings. That is, the second locking member here realizes the functions of locking and hinge at the same time. In addition, in order to improve the connection strength, the first matching locking plate 107 has a protrusion 1072 extending from the side along its transverse direction to increase the connection area between the first matching locking plate 107 and the front connecting rod 105. Corresponding to the arrangement position of the first matching locking plate 107, as shown Figure 3 and Figure 4 As shown, the first locking member configured as a rotation locking plate 103 is rotatably arranged on a connection point of the upper connecting plate 110, such as a rotation connection hole. For this purpose, a nut 104 and a step screw 115 are also provided to hinge the rotation locking plate 103 to the upper connecting plate 110. In addition, in order to achieve the resettable engagement of the first matching tooth portion of the first locking member configured as the rotation locking plate 103 and the second matching tooth portion of the second locking member configured as the first matching locking plate 107, a rotation locking plate-reset tension spring 102 is also provided, which is connected to the upper connecting plate 110 with one end and connected to the portion of the first locking member opposite to the first matching tooth portion with the other end.

[0074] It should be pointed out here that, in addition to Figure 3 In addition to the locking mechanism arrangement structure shown in FIG. 4, other arrangements can also be envisioned. For example, the second matching tooth portion on the first matching locking plate 107 can also be moved to or near other hinge points of the four-bar linkage assembly 1. For example, the tooth features of the second matching tooth portion of the second locking member can be welded or integrated at the lower hinge point of the front link 105. Correspondingly, the first locking member is no longer hinged with the upper connecting plate 110, but is hinged with the lower connecting plate 114 to achieve the cooperation between the first matching tooth portion of the first locking member and the second matching tooth portion of the second locking member. At this time, the original first matching locking plate 107 can be changed to the front connecting rod hinge plate 113, that is, the front connecting rod 105 is hinged to the upper connecting plate 110 via the front connecting rod hinge plates 113 on both sides. In addition, in addition to the front connecting rod 105, it is also conceivable to arrange the locking mechanism at or near the hinge point of the rear connecting rod 108 and the upper connecting plate 110 or the lower connecting plate 114.

[0075] In summary, the second locking member constructed as the first matching locking plate 107 is arranged on one of the front link 105 and the rear link 108, so that the second matching tooth portion is arranged close to any one of the multiple hinge points, wherein when the second matching tooth portion is close to the upper hinge point, the first locking member constructed as the rotating locking plate 103 is rotatably arranged on the upper connecting plate 110; and when the second matching tooth portion is close to the lower hinge point, the first locking member is rotatably arranged on the base, especially the lower connecting plate 114 of the base.

[0076] Below with the help of Figures 5 to 11 The arrangement structure and working principle of the unlocking mechanism, the locking mechanism and the front-rear adjustment mechanism of the first embodiment of the headrest assembly according to the present disclosure are described.

[0077] like Figure 5 and Figure 6 As shown, the headrest assembly also includes a headrest cover body, which includes a front cover 2 and a rear cover 3. The four-bar linkage assembly 1 is fixed to the front cover 2 by screws, and the rear cover 3 is fixed to the front cover 2 by plastic buckles. The unlocking mechanism includes a pusher 6 as an unlocking movable member and an intermediate transmission member configured as a rotating transmission member 8, and the rotating transmission member 8 cooperates with the rotating locking plate 103. The pusher 6 can be pushed along a first direction and can thereby drive the rotating transmission member 8 to rotate, and then drive the rotating locking plate 103 to rotate around a first rotation axis extending along the first direction. Here, the first direction can be the lateral direction of the headrest assembly or the front and rear adjustment mechanism. In order to realize manual operation of the pusher 6, the unlocking mechanism also includes a button 4 and a button reset spring 5 for resetting the button. The button 4 is fixed to the rear cover 3 by a plastic buckle.

[0078] from Figures 7 to 11 It can be clearly seen that when force acts on button 4, button 4 slides to the right through button frame 302, for example, so that button 4 generates a driving force on pusher 6. Pusher 6 is forced to push rotary transmission member 8, and rotary transmission member 8 rotates through shaft 801 to push away the first locking member configured as rotary locking plate 103, thereby unlocking the front and rear adjustment mechanism configured as a four-bar linkage assembly 1. In order to achieve this rotational movement, a first extension portion 8021 and a second extension portion 8022 for cooperating with pusher 6 and rotary locking plate 103 are respectively provided on the shaft 801. Specifically, as Figures 9 to 11As shown, the pusher 6 moves under the action of the thrust, and pushes the first extension 8021 of the rotary transmission member 8 through the push plate sliding portion 601, so that the rotating shaft 801 rotates, and then the second extension 8022 acts on the rotary locking plate-unlocking portion 1031 and exerts a force that produces a toggle effect. 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 along 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.

[0079] In an embodiment not shown, for the intermediate transmission member, in addition to the above-mentioned rotary intermediate transmission member, a translational intermediate transmission member can also be envisioned. 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 driving the rotation locking plate 103 to rotate. In particular, the pusher 6 can cooperate with the translational intermediate transmission member through a first inclined surface structure, so 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, wherein the translation of the translational intermediate transmission member along the second direction can generate a force on the rotation locking plate-unlocking portion 1031 of the rotation locking plate 103 to cause the rotation of the rotation locking plate 103. The first inclined surface structure can convert the movement along one direction into the movement along another direction, especially the direction orthogonal to the aforementioned direction, thereby also realizing the motion conversion from the movement of the pusher 6 to the rotation of the rotation locking plate 103.

[0080] Next, with the help of Figures 12 to 17 The gear adjustment motion principle of the front and rear adjustment mechanism constructed as a four-bar linkage assembly 1 is described.

[0081] like Figure 12 to Figure 14 As shown, when adjusting forward, unlocking is not required, the upper connecting plate 110 is subjected to positive pulling force (e.g., pulling force pointing to the left as shown in the figure), driving the front connecting rod 105 and the first matching locking plate 107 to rotate and move forward around the hinge point of the lower connecting rod at the front, and the second matching tooth portion configured as the first matching locking plate-locking tooth 1071 drives the first matching tooth portion configured as the rotating locking plate-locking portion 1033 to rotate around the rotating locking plate-rotation center 1032 and disengage from each other, and then engages with the next notch of the first matching locking plate-locking tooth 1071 through the pulling force of the rotating locking plate-reset tension spring 102, completing the gear adjustment. Unlocking is not required in this process.

[0082] In addition, if Figures 15 to 17As shown, when adjusting backward, the unlocking mechanism is used to unlock the vehicle first. Under the action of the unlocking mechanism, the rotation locking plate-unlocking portion 1031 is subjected to force and thereby rotates and unlocks the vehicle around the rotation locking plate-rotation center 1032 in the direction indicated by the arrow. The upper connecting plate 110 is subjected to the backward rotational pulling force of the return spring 109 and is reset to the last position or reset to any gear position under the manual control of the occupant, and the rotation locking plate-unlocking portion 1031 is no longer subjected to force. Under the reverse pulling force of the rotation locking plate-reset tension spring 102, the rotation locking plate 103 is locked with the first matching locking plate 107 again, completing the reset lock.

[0083] In order to prevent the rotatable rotation locking plate 103 from being disengaged during the engagement process with the first matching locking plate 107, as shown in FIG. Fig.17 and Fig.18 As shown, a limiting member 1034, in particular a fixed limiting bracket, is provided, and the two ends of the limiting member 1034 are fixed together with the placement point of the first matching locking plate 107 and the installation point of the rotating locking plate 103, so that the rotating locking plate 103 and the first matching locking plate 107 are fixed and limited in the middle relative position to prevent lateral displacement during adjustment, especially collision, causing the rotating locking plate 103 and the first matching locking plate 107 to be disengaged.

[0084] In order to achieve favorable locking and unlocking of the first ratchet structure of the first locking member configured as the rotation locking plate 103 and the corresponding matching toothed portion of the second locking member configured as the first matching locking plate 107, as shown in FIG. Fig.19 As shown, when the rotatable rotary locking plate 103 is engaged with the first matching locking plate 107 and is in a stationary state, the axis line passing through the axis of motion of the rotary locking plate 103 forms a 90° angle with the overlapping surface of the first matching locking plate 107, wherein the first matching tooth portion and the second matching tooth portion overlap on the overlapping surface. When the angle is greater than 90°, the contact surface will become 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 will occur, resulting in excessive locking force, which is not conducive to unlocking the rotary locking plate 103 from the first matching locking plate 107. In addition, as Fig.19 As shown, the tooth position is based on the circularity line of the movement axis of the first matching locking plate 107, and the angle between the teeth is 10 degrees.

[0085] Then with the help of Figures 20 to 30 The arrangement structure and working principle of the front-rear adjustment mechanism, the locking mechanism and the unlocking structure of the second embodiment of the headrest assembly according to the present disclosure are described.

[0086] The front-to-back adjustment mechanism of the second embodiment of the headrest assembly according to the present disclosure is substantially the same in structure as the front-to-back adjustment mechanism of the first embodiment, except for the connection structure for connecting the first locking member of the locking mechanism. Therefore, for the front-to-back 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.

[0087] In the first embodiment, the first locking member is connected to the corresponding component of the front-rear 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 a translational movement, thereby the connection structure of the front-rear adjustment mechanism for the first locking member is also changed accordingly. This is described in more detail below.

[0088] like Figure 21 to Figure 27As shown, in the second embodiment, the unlocking mechanism also includes a button 4. In addition, the unlocking mechanism also includes a pusher 6 and an unlocking slide 9, and the movement of the pusher 6 can drive the unlocking slide 9 to move in the same direction. In this embodiment, the pusher 6 and the unlocking slide 9 jointly form an unlocking moving member according to the present disclosure, that is, in the second embodiment, the unlocking moving member is constructed in two pieces. Of course, in other embodiments, it is also conceivable that the pusher 6 and the unlocking slide 9 are constructed in one piece. The unlocking slide 9 has an unlocking slide sliding portion 901. In addition, in the second embodiment, the locking mechanism includes a first locking member configured as a sliding locking plate 118 and a second locking member configured as a second matching locking plate 117. The sliding locking plate 118 also has a first matching tooth portion and also includes a sliding locking plate track 1181 for cooperating with the unlocking moving part of the unlocking structure, especially the unlocking slider 9, and a sliding locking plate reset portion 1182 for cooperating with the connecting structure of the front and rear adjustment mechanism, wherein the sliding locking plate reset portion 1182 can slide in the upper connecting plate slot 1104 and can be reset via a slider reset spring 119, which is connected to the sliding locking plate reset portion 1182 with one end and fixed to the upper connecting plate 110 with the other end. Of course, it is also conceivable that when the sliding locking plate 118 is arranged on a base, especially on the lower connecting plate 114 of the base, the slider reset spring 119 can also be fixed to the base with the other end. In addition, in the second embodiment, the second matching locking plate 117 also has a second matching tooth portion. In addition, the second matching locking plate 117 is substantially identical in structure to the first matching locking plate 107 of the first embodiment. The unlocking slider 9 of the unlocking moving member, especially the unlocking slider sliding portion 901 thereof, cooperates with the sliding locking plate 118 configured as the first locking member, especially the sliding locking plate track 1181 thereof, through a second inclined surface structure (i.e., an inclined surface-sliding structure composed of the unlocking slider sliding portion 901 and the sliding locking plate track 1181), so that the unlocking moving member, such as the pusher 6 of the unlocking moving member and thus the unlocking slider 9, can drive the sliding locking plate 118 to translate along another second direction orthogonal to the first direction. The other second direction may be different from the aforementioned second direction. The translational movement along the other second direction should ensure that the sliding locking plate 118 can be disengaged from the second matching locking plate 117 when unlocking is required.

[0089] like Fig. 27As shown, the corresponding matching teeth of the sliding locking plate 118 and the second matching locking plate 117 can form a second ratchet structure. Similarly, when the front-back adjustment mechanism adjusts the headrest cover forward, it can drive the second matching locking plate 117 to move, so that the sliding locking plate 118 translates and its first matching teeth are automatically disengaged from the second matching teeth of the second matching locking plate 117. In other words, when the front-back adjustment mechanism adjusts the headrest cover forward, the sliding locking plate 118 automatically slides out and unlocks; when the front-back adjustment mechanism is adjusted backward without being unlocked, the sliding locking plate 118 is locked in place. Depending on the specific application, the second matching tooth portion of the second matching locking plate 117 in the second embodiment may be the same as the second matching tooth portion of the first matching locking plate 107 in the first embodiment. In this case, the second matching locking plate 117 and the first matching locking plate 107 are the same component; or the second matching tooth portion of the second matching locking plate 117 in the second embodiment may also be different from the second matching tooth portion of the first matching locking plate 107 in the first embodiment based on the specific structure of the first matching tooth portion of the sliding locking plate 118.

[0090] from Fig.21 and Figures 28 to 30 It can be clearly seen that the button 4 is stressed and thus the pusher 6 is moved, thereby pushing the unlocking slider 9. The sliding portion 901 of the unlocking slider is stressed to generate oblique downward pressure and act on the sliding locking plate track 1181, thereby driving the sliding locking plate 118 to disengage from the second matching locking plate 117, so as to complete the unlocking of the sliding locking plate 118 and the second matching locking plate 117. When the thrust applied to the button 4 disappears, the slider return spring 119 drives the sliding locking plate return portion 1182 to return to the upper connecting plate slot 1104, so as to lock the second matching locking plate 117 with the sliding locking plate 118.

[0091] Then with the help of Figure 31 to Figure 36 The arrangement structure and working principle of the structure related to the up and down adjustment mechanism of the third embodiment of the headrest assembly with a manual up and down adjustment mechanism according to the present disclosure are described.

[0092] like Figure 31 to Figure 36As shown, the headrest assembly also includes an up-and-down adjustment mechanism 10, which includes: a fixed base 10a and a moving part 10b, wherein the fixed base 10a is connected to the front-and-back adjustment mechanism, especially the upper connecting plate thereof, and the moving part 10b is connected to the headrest cover, and the moving part 10b can slide up and down relative to the fixed base 10a, thereby realizing the up-and-down adjustment of the headrest cover. In order to realize the locking during the up-and-down adjustment, a plurality of locking grooves arranged at intervals are provided on the fixed base 10a, and the unlocking moving part configured as the unlocking wire member 10c cooperates with the locking groove, wherein when the unlocking wire member 10c is engaged with the locking groove, the up-and-down adjustment mechanism 10 is restricted from adjusting the headrest cover; and when the unlocking wire member 10c is disengaged from the locking groove, the up-and-down adjustment mechanism 10 is allowed to adjust the headrest cover. For the specific structure of the locking groove, reference can be made to the description of similar locking grooves in the Chinese patent CN202420598265.5 of the applicant. In addition, the steel wire in Chinese patent CN202420598265.5 can be used as the unlocking movable part in this application.

[0093] As from Figure 33 to Figure 34 As can be clearly seen in the figure, the unlocking wire 10c includes a protruding moving portion 10d, especially a U-shaped protruding moving portion 10d. The movement of the unlocking wire 10c along the first direction drives the protruding moving portion 10d to disengage from the locking groove, and at the same time drives the first locking member, which is also configured as a rotary locking plate 103, to move to disengage from the second locking member, which is also configured as a first matching locking plate 107, so that the up-down adjustment mechanism 10 adjusts the headrest up-down and allows the front-back adjustment mechanism to adjust the headrest backward. To this end, another rotary transmission member 12 can be provided, and the other rotary transmission member 12 can also convert the movement of the unlocking wire 10c into the rotation of the rotary locking plate 103. In order to achieve the reset of the other rotary transmission member 12, such as Fig.32 As shown, another rotating transmission member, a return torsion spring 11, is also provided. It should be noted here that in Chinese patent CN202420598265.5, a steel wire is used to unlock only the manual up and down adjustment, while in the present disclosure, a single unlocking steel wire is innovatively used to unlock two different directions, that is, not only unlock the up and down adjustment, but also unlock the backward adjustment, thereby realizing a complex function using only a single unlocking steel wire.

[0094] In other aspects, the structure of the third embodiment is substantially the same as that of the first embodiment, and therefore reference may be made to the previous description of the corresponding structure of the first embodiment. In addition, it is also conceivable that the structure of the locking mechanism and the unlocking structure and their corresponding components may also adopt the solution in the second embodiment.

[0095] Finally with the help Fig.37 and Fig.38The arrangement structure and working principle of the structure related to the up and down adjustment mechanism of the fourth embodiment of the headrest assembly with the electric up and down adjustment mechanism according to the present disclosure are described.

[0096] In order to realize the electric adjustment of the up and down adjustment mechanism 10, in the fourth embodiment, as shown in FIG. Fig.37 and Fig.38 As shown, the up-down adjustment mechanism 10 also includes a motor assembly, which includes a motor 126, a screw connected to the motor in rotation, and a nut 14 arranged on the screw, wherein the motor 126 is fixedly arranged on the front-back adjustment mechanism constructed as a four-link assembly 1 through a motor bolt 120, and the front-back adjustment mechanism is connected to the fixed base 10a through a screw, so that the motor 126 is fixedly arranged relative to the fixed base 10a, and the nut 14 is operatively connected to the moving part 10b, for example, via a gear-rack transmission mechanism. When the motor 126 drives the nut 14 to move along the screw, the moving part 10b moves relative to the fixed base 10a. It can also be imagined that in an embodiment not shown, the motor 126 is fixedly arranged relative to the moving part 10b, for example, directly fixed on the moving part 10b, and the nut 14 is operatively connected to the fixed base 10a. In addition, it can also be imagined that the second nut 14 is fixedly operatively connected to the moving part 10b, especially the second nut 14 can be fixed to the moving part 10b by a screw.

[0097] In other aspects, the structure of the fourth embodiment is substantially the same as that of the first embodiment, and therefore reference may be made to the previous description of the corresponding structure of the first embodiment. In addition, it is also conceivable that the structure of the locking mechanism and the unlocking structure and their corresponding components may also adopt the solution in the second embodiment.

[0098] Finally, it should be pointed out that, in the present disclosure, the unlocking movable member is described by taking the push member 6 or the push member 6 and the unlocking slider 9 as an example, and those skilled in the art may also imagine that, through a certain degree of modification, the unlocking movable member may also be constructed as a pulling member, and the components related thereto may also be adaptively structurally adjusted to accommodate pulling.

[0099] It should be noted that the terms used herein are for the purpose of illustrating specific aspects only and are not intended to limit the disclosure. As used herein, the singular forms "a" and "the one" shall include the plural forms unless the context clearly states otherwise. It is understood that the terms "include" and "comprises" and other similar terms, when used in the application documents, specify the existence of the stated operations, elements and / or parts, without excluding the existence or addition of one or more other operations, elements, parts and / or combinations thereof. As used herein, the term "and / or" includes all arbitrary combinations of one or more related enumerated items. In the description of the drawings, similar reference numerals always represent similar elements.

[0100] The thickness of the elements in the accompanying drawings can be exaggerated for the sake of clarity. It is also understood that if an element is referred to as being on another element, coupled to another element or connected to another element, then the element can be directly formed on the other element, coupled to it or connected to it, or one or more intervening elements can be arranged between them. On the contrary, if the expressions "directly on...", "directly coupled to..." and "directly connected to..." are used herein, then there is no intervening element. Other words used to illustrate the relationship between elements should be similarly interpreted, such as "between..." and "directly between...", "attachment" and "direct attachment", "adjacent" and "directly adjacent", etc.

[0101] Terms such as "top," "bottom," "above," "below," "above," "below," etc. are used herein to describe the relationship of one element, layer or region to another element, layer or region as illustrated in the drawings. It will be understood that these terms are intended to encompass other orientations of the device in addition to the orientation depicted in the drawings.

[0102] It is to be understood that although the terms "first", "second", etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, a first element may be referred to as a second element without departing from the teachings of the present disclosure.

[0103] It is also contemplated that all exemplary embodiments disclosed herein can be arbitrarily combined with one another. In addition, all individual technical features in this application can be arbitrarily combined with one another, as long as the combined technical features are not mutually contradictory. All technically feasible feature combinations are technical contents recorded in this application.

[0104] Finally, it should be pointed out that the above embodiments are only used to understand the present disclosure, and do not limit the protection scope of the present disclosure. For those skilled in the art, modifications can be made based on the above embodiments, and these modifications do not depart from the protection scope of the present disclosure.

Claims

1. A headrest assembly for a vehicle seat, comprising: A front-to-rear adjustment mechanism for adjusting the headrest cover body front-to-rear; A locking mechanism for locking the adjustment movement of the front and rear adjustment mechanisms; and Unlock the structure, It is characterized in that The locking mechanism is configured to not lock the forward adjustment movement of the fore-and-aft adjustment mechanism so as to allow the fore-and-aft adjustment mechanism to adjust the headrest cover forward, and to lock the rearward adjustment movement of the fore-and-aft adjustment mechanism so as to restrict the fore-and-aft adjustment mechanism from adjusting the headrest cover rearward; The unlocking mechanism cooperates with the locking mechanism and is configured to unlock the locking mechanism when the front-rear adjusting mechanism adjusts the headrest cover backward, so that the front-rear adjusting mechanism can adjust the headrest cover backward.

2. The headrest assembly according to claim 1, characterized in that: The locking mechanism includes a first locking member and a second locking member, wherein the first locking member can be resettably engaged with the second locking member, and when the fore-and-aft adjustment mechanism adjusts the headrest cover forward, the second locking member can be driven to move to disengage from the first locking member, thereby allowing the fore-and-aft adjustment mechanism to adjust the headrest cover forward; when the fore-and-aft adjustment mechanism adjusts the headrest cover backward, the first locking member can be driven to move to disengage from the second locking member through the unlocking mechanism, thereby allowing the fore-and-aft adjustment mechanism to adjust the headrest cover backward.

3. The headrest assembly according to claim 2, characterized in that: A first matching tooth portion is provided at one end of the first locking member, and the second locking member has a second matching tooth portion, the first matching tooth portion and the second matching tooth portion being configured so that the forward adjustment movement of the front-back adjustment mechanism can drive the movement of the second locking member, so that the second matching tooth portion and the first matching tooth portion automatically disengage from each other, thereby allowing the front-back adjustment mechanism to adjust the headrest cover body forward; and the backward adjustment movement of the front-back adjustment mechanism causes the first matching tooth portion to remain engaged with the second matching tooth portion, thereby limiting the front-back adjustment mechanism from adjusting the headrest cover body backward; and / or The unlocking mechanism comprises an unlocking movable member, and movement of the unlocking movable member in a first direction can drive the first locking member to move so that the first locking member is disengaged from the second locking member, thereby allowing the front-rear adjustment mechanism to adjust the headrest backward; and / or The first locking member is configured to rotate around a first rotation axis extending along a first direction, and the unlocking mechanism further includes an intermediate transmission member cooperating with the first locking member, and movement of the unlocking movable member along the first direction can drive the intermediate transmission member to move, thereby driving the first locking member to rotate; and / or The movement of the unlocking movable member along the first direction can drive the intermediate transmission member to rotate, thereby driving the first locking member to rotate; and / or The intermediate transmission member comprises a rotating shaft extending in a vertical direction, and a first extending portion and a second extending portion arranged on the rotating shaft for respectively cooperating with the unlocking movable member and the first locking member, so that the movement of the unlocking movable member in a first direction drives the rotating shaft to rotate through the first extending portion, and then the second extending portion drives the first locking member to rotate around a first rotation axis extending in the first direction; and / or The movement of the unlocking movable member along the first direction can drive the intermediate transmission member to translate, thereby driving the first locking member to rotate; and / or The unlocking movable member cooperates with the intermediate transmission member through a first inclined surface structure, so that the movement of the unlocking movable member along the first direction can drive the intermediate transmission member to translate along a second direction orthogonal to the first direction, wherein the translation of the intermediate transmission member along the second direction causes the first locking member to rotate; and / or The rotatable first locking member has a protruding hook-shaped portion as the first matching tooth portion, and the shape of the hook-shaped portion and the shape of the second matching tooth portion of the second locking member are designed so that the first matching tooth portion of the rotatable first locking member and the second matching tooth portion of the second locking member constitute a first ratchet structure, and when the front-rear adjustment mechanism adjusts the headrest cover forward, the second locking member can be driven to move, so that the first locking member rotates and its hook-shaped portion and the second matching tooth portion automatically disengage from each other; and / or The movement of the unlocking movable member along the first direction can drive the first locking member to translate; and / or The unlocking movable member cooperates with the first locking member via a second inclined surface structure, so that the movement of the unlocking movable member along the first direction can drive the first locking member to translate along another second direction orthogonal to the first direction; and / or The first matching tooth portion of the first translationally movable locking member and the second matching tooth portion of the second locking member form a second ratchet structure, which can drive the second locking member to move when the front-rear adjustment mechanism adjusts the headrest cover forward, so that the first locking member translates and the first matching tooth portion and the second matching tooth portion thereof automatically disengage from each other; and / or The headrest assembly further includes an up-and-down adjustment mechanism, which includes: a moving component and a fixed base, wherein the fixed base is connected to the front-and-rear adjustment mechanism, the moving component is connected to the headrest cover, and the moving component can slide up and down relative to the fixed base, thereby achieving up-and-down adjustment of the headrest cover; and / or A plurality of locking grooves arranged at intervals are provided on the fixed base, and the unlocking movable member cooperates with the locking grooves, wherein when the unlocking movable member is engaged with the locking grooves, the up-down adjustment mechanism is restricted from adjusting the headrest cover; and when the unlocking movable member is disengaged from the locking grooves, the up-down adjustment mechanism is allowed to adjust the headrest cover; and / or The unlocking movable member includes a protruding movable portion, and the movement of the unlocking movable member in a first direction drives the protruding movable portion to disengage from the locking groove, and at the same time drives the first locking member to move to disengage from the second locking member, thereby allowing the up-and-down adjustment mechanism to adjust the headrest up-and-down and allowing the front-and-rear adjustment mechanism to adjust the headrest rearward; and / or The up and down adjustment mechanism further includes a motor assembly, which includes a motor, a screw rod rotatably connected to the motor, and a nut arranged on the screw rod, wherein the motor is fixedly arranged relative to one of the fixed base and the moving part, and the nut is operatively connected to the other of the fixed base and the moving part, and when the motor drives the nut to move along the screw rod, the moving part moves relative to the fixed base; and / or The front-rear adjustment mechanism comprises: a base connected to the backrest of the seat; an upper connecting plate connected to the fixed base; and a front connecting rod and a rear connecting rod respectively hinged to the base and the upper connecting plate.

4. The headrest assembly according to claim 3, characterized in that: The front and rear adjustment mechanism includes: a base connected to the seat back; an upper connecting plate connected to the headrest cover; and a front connecting rod and a rear connecting rod respectively hinged to the base and the upper connecting plate, thereby forming a plurality of hinge points.

5. The headrest assembly according to claim 3 or 4, characterized in that: The second locking member is arranged on one of the front link and the rear link, so that the second matching tooth portion is close to any one of the multiple hinge points, wherein when the second matching tooth portion is close to the upper hinge point, the first locking member is movably arranged on the upper connecting plate; and when the second matching tooth portion is close to the lower hinge point, the first locking member is movably arranged on the base.

6. The headrest assembly according to claim 5, characterized in that: The front link is constructed as a hollow tubular profile; and / or The front connecting rod is configured in a U shape, and comprises two side legs and a middle connecting portion connecting the two side legs; and / or The second locking member further comprises a connecting rod hinge portion for hingedly connecting the front connecting rod to the upper connecting plate, wherein the second locking member is arranged on a side area of ​​a middle connecting portion of the front connecting rod; and / or The second locking member has a protrusion extending from the side along the transverse direction thereof, so as to increase the connection area between the second locking member and the front connecting rod; and / or A limiting member is provided on a side of the first locking member facing away from the upper connecting plate or the base, wherein the limiting member is configured to limit lateral movement of the first locking member to prevent the first matching tooth portion from being disengaged from the second matching tooth portion; and / or When the first locking member is configured to be slidable, the first locking member is slidably disposed on the upper connecting plate or the base through a sliding groove type sliding structure.

7. The headrest assembly according to claim 3, characterized in that: The unlocking movable member includes or is configured as a pushing member, wherein the first locking member can be driven to move by the pushing member along the first direction.

8. A vehicle seat comprising a headrest assembly according to any one of claims 1 to 7.

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