Automobile seat folding headrest mechanism, automobile seat and method

Abstract

The invention relates to the technical field of automobile seat headrests, in particular to an automobile seat folding headrest mechanism, an automobile seat and a method, an arc-shaped rod is arranged to penetrate through an opening of a shielding part, when a headrest is folded and reset, the arc-shaped rod can achieve arc-shaped rotation of a headrest rod, and the headrest can be folded and reset relative to a straight rod. The opening of the shielding piece can have a small opening size, the gap between the shielding piece and the periphery of the headrest rod is small, when the headrest rotates forwards to be folded, the arc-shaped rod moves along an arc line, it is ensured that the stroke of the headrest rod is always kept within the range of the rectangular hole of the shielding piece, the appearance of the shielding mechanism is not affected while the requirement for folding movement of the headrest is met, and the shielding mechanism is convenient to use. And the protection effect on the folding mechanism is also facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive seat headrests, and in particular to a folding headrest mechanism for an automotive seat, an automotive seat, and a method. Background Art

[0002] Most of the rear seat headrests in the existing market are plug-in type. Under the limitation of the distance between the front and rear seats of the vehicle, when the rear seat needs to be reclined, the headrest on the rear seat will touch the front seat and cannot be reclined. Or when the vehicle space is relatively large, the rear seat can be just reclined, but the unfolded headrest will affect the backward movement of the front seat, restricting the front and rear space of the front seat. Therefore, a headrest folding mechanism has emerged. When the rear seat needs to be reclined, the headrest is folded to ensure that the reclined rear seat will not affect the backward movement of the front seat.

[0003] However, for the folding headrest mechanisms in the current market, due to factors such as the rotation angle, movement stroke, and assembly process of the headrest rod during the folding process, the shielding member usually adopts a slotted form with a relatively large opening size and shaping angle to prevent interference between the headrest and the shielding member during the folding process. This results in uneven or excessive gaps between the folding headrest shielding member and the periphery of the headrest rod, and the visual effect of the appearance is not good. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a folding headrest mechanism for an automotive seat, an automotive seat, and a method. By arranging an arc-shaped rod to penetrate through the opening of the shielding member, when the headrest is folded and reset, the arc-shaped rod can realize the arc rotation of the headrest rod. Compared with the straight rod form, the opening of the shielding member can have a smaller opening size, and the gap between the shielding member and the periphery of the headrest rod is small.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] In a first aspect, a folding headrest mechanism for an automotive seat includes a folding mechanism mounting plate, which is mounted on the backrest frame of the seat. A set of rotatable headrest rod assemblies and a folding mechanism are mounted on the folding mechanism mounting plate. A shielding member is also mounted on the folding mechanism mounting plate, and the shielding member is provided with an opening. The headrest rod assembly includes a continuous arc-shaped rod and a straight rod. One end of the arc-shaped rod is connected to the output end of the folding mechanism, and the other end passes through the opening and extends outside the opening to be connected to the straight rod.

[0007] As a further implementation, a U-shaped frame is provided on the folding mechanism mounting plate. The U-shaped frame has a set of opposite side plates. The folding mechanism is rotatably connected to the side plates. Openings are provided at corresponding positions on both side plates. The headrest rod assembly includes a rotating shaft, the rotating shaft passes through the openings and both ends are fixedly connected to the arc-shaped rod, and the output end of the folding mechanism can drive the rotating shaft to rotate.

[0008] As a further implementation manner, a cam with a rotating shaft, an unlocking plate, and an unlocking block are sequentially rotatably connected between the two side plates. The unlocking block is sleeved and fixed on the rotating shaft. The cam and the unlocking plate are rotated between the side plates through their respective rotating shafts. The rotating shaft of the cam is sleeved with an unlocking return torsion spring, and the rotating shaft is sleeved with a reclining assist torsion spring.

[0009] As a further implementation manner, the rotating shaft of the cam passes through the side plate and is connected to one end of an unlocking rod. The other end of the unlocking rod is connected to an unlocking cable. One end of the unlocking return torsion spring is fixed to the inner side of the side plate, and the other end is fixed to the cam. When unlocking, the resistance of the unlocking return torsion spring to the cam gradually increases; the end of the unlocking cable is connected to an unlocking motor. When the seat rotates by a set angle, the unlocking motor is triggered to work.

[0010] As a further implementation manner, the unlocking plate has an unlocking claw, and the unlocking claw abuts against the cam to drive the unlocking plate to rotate; an arc-shaped groove cooperating with the unlocking block is further provided on the unlocking plate. A protrusion is provided at the end of the arc-shaped groove to form a locking portion; the unlocking block is provided with an arc-shaped portion cooperating with the arc-shaped groove, and a locking groove is provided at a position near the end of the arc-shaped portion for engaging with the locking portion to achieve locking.

[0011] As a further implementation manner, one end of the reclining assist torsion spring is fixed to the inner side of the side plate, and the other end is fixed to the unlocking block, and has a tendency to rotate the unlocking block to fold the headrest.

[0012] As a further implementation manner, both ends of the rotating shaft are fixedly connected to an arc-shaped rod through a connecting frame. Buffer pads are provided on both the U-shaped frame and the connecting frame to limit the rotation angle of the connecting frame.

[0013] As a further implementation manner, it further includes a shielding member. The shielding member includes a mounting base fixed on the backrest frame. An upper decorative member is snapped onto the mounting base, and the opening positions on the mounting base and the upper decorative member correspond to each other.

[0014] In a second aspect, an automotive seat includes the automotive seat folding headrest mechanism as described in any one of the above, and further includes a seat frame and a backrest frame that are rotatably connected. A folding mechanism mounting plate is provided on the backrest frame. The end of the unlocking cable extends inside the backrest of the automotive seat and is connected to an unlocking motor; an angle sensor is provided inside the backrest frame. When it monitors that the backrest frame rotates to a set angle, the unlocking motor starts to work.

[0015] In a third aspect, a working method of an automotive seat includes the automotive seat as described in any one of the above, and includes the following steps:

[0016] The backrest frame rotates relative to the seat frame, and the control unit obtains the rotation angle detected by the angle sensor. When the set angle is reached, the unlocking motor is controlled to start. The unlocking motor drives the cam to rotate through the pull wire, thereby realizing the rotation of the unlocking claw, so that the locking grooves of the locking part and the unlocking block are disengaged from each other. Under the action of the reclining assist spring, the arc rod rotates outward relative to the opening of the shielding member to realize the folding of the headrest;

[0017] When the car seat is reset, the control unit obtains the rotation angle detected by the angle sensor. When the set angle is reached, the unlocking motor is controlled to start. The unlocking motor releases the pull wire. Under the action of the unlocking reset spring, the cam is reset and drives the unlocking claw to reset. The headrest is manually pried to make the unlocking block move in the reset direction until the locking part is re-engaged with the locking groove to complete the reset of the headrest.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention provides an arc-shaped rod that passes through the opening of the shielding member. When the headrest is folded and reset, the arc-shaped rod can realize the arc-shaped rotation of the headrest rod. Compared with the straight rod form, the opening of the shielding member can have a smaller opening size, and the gap around the shielding member and the headrest rod is small. When the headrest is rotated and folded forward, the arc-shaped rod moves along the arc to ensure that the stroke of the headrest rod is always kept within the rectangular hole range of the shielding member. While satisfying the folding movement of the headrest, it does not affect the appearance of the shielding mechanism and is also beneficial to the protective effect of the folding mechanism.

[0020] 2. When the car seat of the present invention is rotated to a set angle, the unlocking motor is triggered to work, and the headrest begins to fold at this time, thereby achieving automatic folding of the headrest when the car backrest is folded down to a certain angle, which can effectively avoid interference and collision with the front seat during the folding process.

[0021] 3. The present invention provides a front limit buffer pad and a rear limit buffer pad, which can effectively ensure the stability of the operation of the headrest folding mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 is a schematic diagram of a folding headrest mechanism for a car seat from a first perspective in an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of a folding headrest mechanism for a car seat from a second viewing angle in an embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of a cam in an embodiment of the present invention;

[0026] Figure 4 It is a third - perspective schematic diagram of the folding headrest mechanism of an automotive seat in an embodiment of the present invention;

[0027] Figure 5 It is a partial - structure schematic diagram of the folding headrest mechanism of an automotive seat in an embodiment of the present invention;

[0028] Figure 6 It is a structural schematic diagram of a shielding member in an embodiment of the present invention;

[0029] Figure 7 It is a connection schematic diagram of an embedded plastic guide sleeve and a straight rod in an embodiment of the present invention;

[0030] Figure 8 It is a sectional view of the connection between an embedded plastic guide sleeve and a straight rod in an embodiment of the present invention;

[0031] Figure 9 It is an exploded view of the folding headrest mechanism of an automotive seat in an embodiment of the present invention;

[0032] Figure 10 It is a state - flow chart when the automotive seat folds in an embodiment of the present invention.

[0033] In the figure: The distances or sizes between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0034] Among them: 2. Folding - mechanism mounting plate, 21. Side plate, 3. Unlocking rod, 31. Movable end, 32. Fixed block, 4. Cam, 41. Torsion - spring limiting part, 42. Unlocking part; 5. Unlocking plate, 51. Unlocking claw, 52. Arc - shaped groove, 53. Locking part; 6. Unlocking block, 61. Through - hole; 62. Arc - shaped part, 63. Locking groove; 7. Arc - shaped rod, 71. Connecting frame, 72. Straight rod, 721. Card slot, 8. Rotating shaft, 18. Rotating shaft sleeve; 111. Snap ring, 112. Embedded plastic guide sleeve, 113. Headrest face cover; 12. Unlocking cable, 121. Guide sleeve, 122. Positioning plate, 123. Pulling block; 13. Unlocking motor, 14. Unlocking return torsion spring, 15. Laying - down assist torsion spring, 16. Front - limit buffer pad, 17. Rear - limit buffer pad; 9. Upper decorative part, 91. Opening, 10. Mounting base. Detailed implementation manners

[0035] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0036] Embodiment 1

[0037] In a typical implementation manner of the present invention, referring to Figures 1 - 10As shown in the figure, an automotive seat folding headrest mechanism includes a folding mechanism mounting plate 2, on which a set of rotatable headrest rod assemblies and a folding mechanism are installed. A shielding member is also installed on the folding mechanism mounting plate 2, and the shielding member is provided with an opening 91. The headrest rod assembly includes a continuous arc-shaped rod 7 and a straight rod 72. One end of the arc-shaped rod 7 is connected to the output end of the folding mechanism, and the other end passes through the opening 91 and extends outside the opening 91 to be connected to the straight rod 72.

[0038] The folding mechanism mounting plate 2 is installed on the backrest frame of the seat and serves as the installation support plate for the folding mechanism. The folding mechanism mounting plate 2 is provided with a U-shaped frame, as Figure 1 shown. The U-shaped frame has a set of opposite side plates 21. The folding mechanism is rotatably connected to the side plates 21, and the folding mechanism is disposed between the two side plates 21 on the U-shaped frame.

[0039] As Figure 2 shown, openings are provided at corresponding positions near the top ends of the two side plates 21. The headrest rod assembly includes a rotating shaft 8, an arc-shaped rod 7, a straight rod 72, and a connecting frame 71.

[0040] The middle position of the rotating shaft passes through the opening on the side plate 21 and is matched with the opening through a rotating shaft sleeve 18. The two ends are fixedly connected to the connecting frame 71. The connecting frame 71 is U-shaped. The top ends of its two side plates are fixed to the rotating shaft 8, and the two ends of the bottom surface of the bottom plate are fixedly connected to the arc-shaped rod 7. The rotation of the rotating shaft 8 can drive the arc-shaped rod 7 to rotate through the connecting frame 71, and the output end of the folding mechanism can drive the rotating shaft to rotate.

[0041] The folding mechanism includes an unlocking rod 3, a cam 4, an unlocking plate 5, and an unlocking block 6.

[0042] As Figure 1 shown, the unlocking rod 3 serves as the transmission rod during unlocking. One end of it is the movable end, and the other end is used to be fixedly connected to the cam 4. A fixing block 32 is provided at the movable end 31. The fixing block 32 is connected to the unlocking cable 12. The unlocking cable 12 drives the movable end of the unlocking rod 3 to rotate with the other end as the rotation center.

[0043] As Figure 1 shown, a positioning plate 122 is provided on the front side of the folding mechanism mounting plate 2. A guide sleeve 121 is fixed on the positioning plate 122. One end of the unlocking cable 12 passes through the guide sleeve 121 and is fixed to a pull block 123. A clamping groove is provided on the pull block 123 to achieve clamping connection with the fixing block 32. The pull block 123 can pull the fixing block 32 to realize the rotation of the unlocking rod 3. The other end of the unlocking cable 12 is connected to the unlocking motor 13. The unlocking cable 12 is wound around the roller at the output end of the unlocking motor 13. The rotation of the roller can realize the unlocking cable 12 pulling the unlocking rod 3.

[0044] As Figures 1 - 4As shown, a cam 4 with a rotating shaft and an unlocking plate 5 are rotatably connected between the two side plates 21 of the U-shaped frame in sequence, and an unlocking block 6 is also rotatably connected between the two side plates 21.

[0045] The cam 4 and the unlocking plate 5 rotate between the side plates through their respective rotating shafts. Both ends of the rotating shaft of the cam 4 cooperate with the side plates 21, and one end passes through the side plate 21 and is connected to the end of the unlocking rod, so that the unlocking rod 3 drives the cam to rotate between the two side plates 21.

[0046] Both ends of the rotation axis of the unlocking plate 5 cooperate with the side plates 21 , and the cam 4 cooperates with the unlocking plate 5 . The rotation of the cam 4 drives the unlocking plate 5 to rotate to unlock the unlocking block 6 .

[0047] The unlocking block 6 is sleeved and fixed on the rotating shaft 8. The rotation of the unlocking block 6 can drive the rotating shaft 8 to rotate, thereby realizing the rotation of the arc rod 7.

[0048] like Figure 3 As shown, the cam 4 is provided with a torsion spring limiting portion 41 and an unlocking portion 42. The torsion spring limiting portion 41 is a groove-shaped structure, which can be engaged with one end of the unlocking reset torsion spring 14. When unlocking, the cam 4 rotates clockwise to realize the accumulation of force of the unlocking reset torsion spring 14. The unlocking portion 42 is a convex structure, which is used to cooperate with the unlocking claw 51 of the unlocking plate 5.

[0049] like Figure 4 As shown, the unlocking plate 5 is provided with an unlocking claw 51, an arc-shaped groove 52 and a locking portion 53. The unlocking claw 51 is a claw-shaped structure. The inner side of the unlocking claw 51 abuts against the unlocking portion 42. The unlocking portion 42 can drive the unlocking claw 51 to rotate. A groove-shaped structure is formed on the inner side of the unlocking claw 51 to cooperate with the unlocking portion 42. The counterclockwise rotation of the unlocking portion 42 can realize the clockwise rotation of the groove-shaped structure of the unlocking plate 5.

[0050] Then the unlocking plate 5 is rotated, as shown in FIG. Figure 2 As shown, when the unlocking portion 42 rotates clockwise, the unlocking claw 51 can rotate counterclockwise.

[0051] The arc groove 52 is an arc groove-like structure formed on the unlocking plate 5 , and is used to cooperate with the arc portion 62 .

[0052] A block-shaped protrusion is provided at the end of the arc-shaped groove 52 to form a locking portion 53 . The locking portion 53 is formed at the end of the arc-shaped groove 52 in a clockwise rotation direction.

[0053] like Figure 4 As shown, the unlocking block 6 is in the shape of a fan-shaped block structure, which is provided with an arc portion 62 that matches the arc groove 52. The arc portion 62 is provided with a locking groove 63 near the end thereof for engaging with the locking portion 53 to achieve locking. The locking groove 63 is a groove-shaped structure that matches the locking portion 53. The unlocking block 6 is also provided with a through hole 61, as shown in FIG. Figure 4 shown.

[0054] like Figure 1 As shown, an unlocking and resetting torsion spring 14 is sleeved on the rotating shaft of the cam 4, and a laying-down assisting torsion spring 15 is sleeved on the rotating shaft 8.

[0055] One end of the unlocking and reset torsion spring 14 is fixed to the inner side of the side plate 21, and the other end is clamped and fixed on the torsion spring limiting part 41 of the cam 4. The cam 4 rotates clockwise to realize the accumulation of force of the unlocking and reset torsion spring 14. When unlocking, the unlocking and reset torsion spring has a gradually increasing resistance to the cam.

[0056] One end of the folding assist torsion spring 15 is fixed to the inner side of the side plate 21, and the other end is fixed to the through hole 61 of the unlocking block 6, and has a tendency to make the unlocking block 6 rotate clockwise to realize the folding of the headrest. After the headrest is folded, the folding assist torsion spring 15 no longer stores force.

[0057] like Figure 1 , Figure 2 , Figure 4 As shown, when unlocking is required, the cam 4 rotates clockwise, and the torsion spring limiting portion 41 drives the unlocking reset torsion spring 14 to store force. The cam 4 realizes the counterclockwise rotation of the unlocking plate 5 through the cooperation between the unlocking portion 42 and the unlocking claw 51, thereby realizing the disengagement of the arc groove 52 from the arc groove 62, and the locking portion 53 from the locking groove 63. The locking portion 53 releases the limited locking state of the locking groove 63. Since the lying down assisting torsion spring 15 is in the force storage state, the lying down assisting torsion spring 15 can drive the unlocking block 6 to rotate clockwise, thereby realizing the clockwise rotation of the rotating shaft 8, the connecting frame 71, and the arc rod 7. The top of the arc rod 7 is also connected to the straight rod 72, and the straight rod 72 is used to connect the headrest structure, thereby realizing the folding of the headrest.

[0058] When it is necessary to restore the lock, the unlocking motor 13 is reset and the unlocking wire 12 is released. Since the unlocking reset torsion spring 14 accumulates force when unlocking, under the action of the unlocking reset torsion spring 14, it can drive the cam to rotate counterclockwise through the torsion spring limit portion 41, thereby realizing the clockwise rotation of the unlocking plate 5, so that the locking portion 53 is reset to the locked state. At this time, the outer side surface of the locking portion 53 is close to the outer side surface of the arc portion 62 of the unlocking block 6.

[0059] Afterwards, the headrest is manually moved to realize that the arc rod 7 drives the rotating shaft to rotate counterclockwise, thereby realizing the counterclockwise rotation of the locking groove 63 on the unlocking block 6, and the outer side surface of the arc portion 62 slides along the outer side surface of the locking portion 53 until the locking portion 53 is re-engaged with the locking groove 63 and restored to the locked state.

[0060] like Figure 4 As shown, the top of the side plate of the U-shaped frame is bent inward, and a front limit buffer pad 16 is provided. The position of the front limit buffer pad 16 corresponds to the position of the unlocking block 6, which is used to limit the rotation position of the unlocking block 6 when unlocking, that is, the unlocking block 6 stops when it rotates to abut the front limit buffer pad 16.

[0061] Two groups of rear limit buffer pads 17 are evenly distributed in the length direction of the connecting frame 71 to limit the rotation angle of the connecting frame to prevent it from returning to a locked state. If the manual breaking force is too large, the connecting frame 71 can be released from the backrest frame through the rear limit buffer pads 17 to achieve limitation. The purpose of the buffer pads is to play a protective role.

[0062] like Figure 6 As shown, the shielding member includes a mounting base 10 and an upper decorative member 9. The mounting base 10 is fixed to the backrest frame and is hidden inside the seat cover and cannot be seen from the outside. The mounting base 10 is snap-fitted with the upper decorative member 9 in the form of a buckle. The positions of the openings 91 on the mounting base 10 and the upper decorative member 9 correspond to each other, which facilitates the movement of the arc rod 7. The upper end of the arc rod 7 passes through the opening of the shielding member and extends to the top of the upper decorative member 9.

[0063] like Figure 7 and Figure 8 As shown, the straight rod 72 is used to connect the headrest structure. The two sets of straight rods 72 are close to each other and have a flat side and a slot 721. The embedded plastic guide sleeve 112 is sleeved on the straight rod 72 and the two are fixedly connected by the retaining spring 111. The retaining spring 111 is matched with the slot 721. Figure 7 and Figure 8 As shown, the embedded plastic guide sleeve 112 is covered with a headrest cover 113 so that the headrest can be installed on the straight rod 72, providing a more convenient assembly process and maintainability.

[0064] In this embodiment, an arc rod 7 is arranged to pass through the opening of the shielding member. When the headrest is folded and reset, the arc rod 71 can realize an arc-shaped rotation of the headrest rod. Compared with the straight rod form, the opening of the shielding member can have a smaller opening size, and the gap around the shielding member and the headrest rod is small. While satisfying the folding movement of the headrest, it does not affect the appearance of the shielding mechanism and is also beneficial to the protective effect of the folding mechanism.

[0065] When the headrest rotates forward and folds, the arc rod 7 moves along the arc, ensuring that the headrest rod stroke always remains within the rectangular hole of the shielding member. The folding headrest mechanism of the automobile seat of this embodiment can reduce the swept area of ​​the headrest rod during the folding process of the headrest, reduce the opening size of the shielding member, and reduce the number of parts to meet the requirements of assembly convenience.

[0066] Specifically, the upper decorative piece is an integral piece that has not been separated and is provided with a rectangular opening 91 with a specification of 22.3mm×17.3mm that matches the arc rod 7. A positioning column and a connecting buckle are provided at the bottom of the upper decorative piece 9. The upper decorative piece 9 is installed on the base 10 by snapping. A movement gap of 2.4mm to 2.7mm is reserved around the shielding piece and the arc rod 7. When the headrest starts to fold to the completion of folding, there is no interference between the headrest rod and the surrounding of the shielding mechanism.

[0067] The end of the unlocking cable in this embodiment is connected to the unlocking motor. When the seat rotates by a set angle, the unlocking motor is triggered to work. That is, when the seat rotates more than 40°, the control unit determines that the seat needs to be folded forward, controls the unlocking motor 13 to work, and at this time, the folding work of the headrest starts. Thus, when the car seat backrest is folded at a certain angle, the headrest can be automatically folded, effectively avoiding interference and collision with the front seat during the folding process.

[0068] Embodiment 2

[0069] In a typical implementation manner of the present invention, referring to Figures 1 - 10 As shown, a car seat includes the car seat folding headrest mechanism of Embodiment 1, and further includes a seat frame and a backrest frame that are rotatably connected. The folding mechanism mounting plate 2 is provided on the backrest frame. The end of the unlocking cable 12 extends inside the car seat backrest and is connected to the unlocking motor 13. An angle sensor is provided inside the backrest frame. When it monitors that the backrest frame rotates to a set angle (more than 40°), the control unit determines that the car seat needs to be folded at this time, and then the control unit controls the unlocking motor 13 to start working to realize the folding of the headrest, so that when the backrest of the car seat is folded, it will just not interfere with the backrest of the front seat. As Figure 10 shown are four states when the rear seat is folded, the first state is the original state, the second state is when the seat back rotates forward by 40°, which is also the state when the unlocking motor 13 starts to work, the third state is the state when the headrest starts to fold, and the fourth state is the state when the rear seat backrest is completely folded.

[0070] Embodiment 3

[0071] In a typical implementation manner of the present invention, referring to Figures 1 - 10 As shown, a working method of a car seat includes the car seat as described in Embodiment 2, and includes the following steps:

[0072] As Figure 1 , Figure 2 , Figure 4As shown, when the rear seat backrest needs to be folded down, the backrest frame rotates relative to the seat frame, and the control unit obtains the rotation angle detected by the angle sensor. When the set angle is reached, the unlocking motor is controlled to start, and the headrest folding mechanism is unlocked. The unlocking motor 13 drives the cam to rotate through the pull wire, and the cam 4 rotates clockwise. The torsion spring limiting part 41 drives the unlocking reset torsion spring 14 to store force. The cam 4 cooperates with the unlocking part 42 and the unlocking claw 51 to realize the counterclockwise rotation of the unlocking plate 5, thereby realizing the arc groove 52 and the arc part 6. 2 disengages from the engagement, the locking portion 53 disengages from the locking groove 63, and the locking portion 53 releases the limit locking state of the locking groove 63. Since the laying-down assist torsion spring 15 is in the power storage state, the laying-down assist torsion spring 15 can drive the unlocking block 6 to rotate clockwise, thereby realizing the clockwise rotation of the rotating shaft 8, the connecting frame 71, and the arc rod 7. The arc rod rotates outward relative to the opening of the shielding member to realize the folding of the headrest. The top of the arc rod 7 is also connected to the straight rod 72, which is used to connect the headrest structure, thereby realizing the folding of the headrest.

[0073] When it is necessary to restore the lock, the control unit obtains the rotation angle detected by the angle sensor. After the rotation angle is reduced to the set angle, the unlocking motor is controlled to start, the unlocking motor 13 is reset, and the unlocking pull wire 12 is released. Since the unlocking reset torsion spring 14 accumulates force when unlocking, under the action of the unlocking reset torsion spring 14, it can drive the cam to rotate counterclockwise through the torsion spring limit part 41, and then realize the clockwise rotation of the unlocking plate, so that the locking part 53 is reset to the locked state. At this time, the outer side surface of the locking part 53 is close to the outer side surface of the arc-shaped part 62 of the unlocking block 6.

[0074] Afterwards, the headrest is manually moved to realize that the arc rod 7 drives the rotating shaft to rotate counterclockwise, thereby realizing the counterclockwise rotation of the locking groove 63 on the unlocking block 6, and the outer side surface of the arc portion 62 slides along the outer side surface of the locking portion 53 until the locking portion 53 is re-engaged with the locking groove 63 and restored to the locked state.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automotive seat folding headrest mechanism, characterized in that, It includes a folding mechanism mounting plate which is mounted on the backrest frame of the seat. A rotatable set of headrest rod assemblies and a folding mechanism are mounted on the folding mechanism mounting plate. A shielding member is also mounted on the folding mechanism mounting plate, and the shielding member is provided with an opening; the headrest rod assembly includes a continuous arc-shaped rod and a straight rod. One end of the arc-shaped rod is connected to the output end of the folding mechanism, and the other end passes through the opening and extends outside the opening to be connected to the straight rod.

2. The folding headrest mechanism of an automotive seat according to claim 1, wherein, The folding mechanism mounting plate is provided with a U-shaped frame which has a set of opposite side plates. The folding mechanism is rotatably connected to the side plates, and openings are provided at corresponding positions of the two side plates. The headrest rod assembly includes a rotating shaft which passes through the openings and both ends are fixedly connected to the arc-shaped rod. The output end of the folding mechanism can drive the rotating shaft to rotate.

3. The folding headrest mechanism of an automotive seat according to claim 2, wherein A cam with a rotating shaft, an unlocking plate and an unlocking block are sequentially rotatably connected between the two side plates. The unlocking block is sleeved and fixed on the rotating shaft. The cam and the unlocking plate are rotated between the side plates through their respective rotating shafts. The rotating shaft of the cam is sleeved with an unlocking return torsion spring, and the rotating shaft is sleeved with a reclining assist torsion spring.

4. The folding headrest mechanism of an automotive seat according to claim 3, characterized in that, The rotating shaft of the cam passes through the side plate and is connected to one end of an unlocking rod, and the other end of the unlocking rod is connected to an unlocking cable. One end of the unlocking return torsion spring is fixed to the inner side of the side plate, and the other end is fixed to the cam. When unlocking, the resistance of the unlocking return torsion spring to the cam gradually increases; the end of the unlocking cable is connected to an unlocking motor. When the seat rotates by a set angle, the unlocking motor is triggered to work.

5. The folding headrest mechanism of an automotive seat according to claim 4, characterized in that, The unlocking plate has an unlocking claw which abuts against the cam to drive the unlocking plate to rotate; the unlocking plate is also provided with an arc-shaped groove which cooperates with the unlocking block, and a protrusion is provided at the end of the arc-shaped groove to form a locking portion; the unlocking block is provided with an arc-shaped portion which cooperates with the arc-shaped groove, and a locking groove is provided at a position near the end of the arc-shaped portion for engaging with the locking portion to achieve locking.

6. The folding headrest mechanism for a vehicle seat according to claim 5, characterized in that, One end of the reclining assist torsion spring is fixed to the inner side of the side plate, and the other end is fixed to the unlocking block, and it has a tendency to rotate the unlocking block to fold the headrest.

7. The folding headrest mechanism for an automotive seat according to claim 2, wherein Both ends of the rotating shaft are fixedly connected to the arc-shaped rod through connecting frames. Buffer pads are provided on both the U-shaped frame and the connecting frames for limiting the rotation angle of the connecting frames.

8. The folding headrest mechanism of an automotive seat according to claim 4, characterized in that, It also includes a shielding member which includes a mounting base fixed on the backrest frame. An upper decorative member is snapped onto the mounting base, and the opening positions on the mounting base and the upper decorative member correspond to each other.

9. An automotive seat, characterized in that, The vehicle seat includes the vehicle seat folding headrest mechanism as described in claim 6, and also includes a seat frame and a backrest frame which are rotatably connected. The folding mechanism mounting plate is arranged on the backrest frame. The end of the unlocking cable extends inside the vehicle seat backrest and is connected to the unlocking motor; an angle sensor is provided inside the backrest frame. When it monitors that the backrest frame rotates to a set angle, the unlocking motor starts to work.

10. A working method of an automotive seat, characterized in that, Including the vehicle seat as described in claim 9, the following steps are included: The backrest frame rotates relative to the seat frame, and the control unit obtains the rotation angle detected by the angle sensor. When the set angle is reached, the unlocking motor is controlled to start. The unlocking motor drives the cam to rotate through the pull wire, thereby realizing the rotation of the unlocking claw, so that the locking grooves of the locking part and the unlocking block are disengaged from each other. Under the action of the reclining assist spring, the arc rod rotates outward relative to the opening of the shielding member to realize the folding of the headrest; When the car seat is reset, the control unit obtains the rotation angle detected by the angle sensor. When the set angle is reached, the unlocking motor is controlled to start. The unlocking motor releases the pull wire. Under the action of the unlocking reset spring, the cam is reset and drives the unlocking claw to reset. The headrest is manually pried to make the unlocking block move in the reset direction until the locking part is re-engaged with the locking groove to complete the reset of the headrest.

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