Flip-delayed headrest
Through the mechanical structure of the limiting assembly and unlocking parts, combined with the drive mechanism, the automatic folding and unfolding of the car headrest is achieved, solving the problems of cumbersome or high cost in the prior art, reducing costs and improving reliability and safety.
Patent Information
- Application Number
- CN202510809592.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-17
- Publication Date
- 2025-07-29
AI Technical Summary
The folding method of existing car headrests is complicated or expensive, especially when the rear seats need to be folded, manual folding is time-consuming and labor-intensive, while the electric folding method is expensive and complex in structure.
The mechanical structure of the limiting assembly and unlocking part is adopted. The automatic flip of the headrest frame is triggered through the flip angle of the seat back, and the automatic folding and unfolding of the headrest is achieved in combination with the driving mechanism to avoid additional driving devices.
The automatic folding and unfolding of the headrest is realized, reducing costs, improving reliability and safety, and simplifying the operation process.
Smart Images
Figure CN120382839A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of vehicle headrests, and particularly to a delayed flip headrest. Background Art
[0002] A vehicle headrest is a driving comfort configuration item and a safety protection item. When a vehicle is rear-ended, the human body will fall backward due to inertia. At this time, the pressure of the vehicle accelerating or decelerating is concentrated on the vulnerable neck and head of the human body, and the headrest plays a buffering role to protect the human head.
[0003] In some rear seats in a vehicle, for example, the third-row seats usually need to be folded to save space or facilitate passengers' entry and exit. As Figure 2 shown, in order to further improve the space utilization rate, the headrests on the seats also need to be folded. Generally, there are two existing headrest folding methods. The first is manual folding, which is cumbersome to operate; the second is electric folding, which uses the cooperation of sensors and driving devices, and its cost is relatively high. Therefore, how to further improve the existing headrest folding method is an urgent problem for those skilled in the art to solve. Summary of the Invention
[0004] One of the purposes of this application is to provide a delayed flip headrest that can be automatically folded.
[0005] To achieve the above object, the technical solution adopted in this application is as follows: A delayed flip headrest includes a seat bottom plate, a seat backrest, a headrest frame, a limiting component, and an unlocking member. The seat backrest is rotatably installed on the seat bottom plate. The headrest frame is elastically rotatably installed on the mounting frame at the top of the seat backrest. The limiting component is installed inside the headrest frame. The first end of the unlocking member is connected to the seat bottom plate, and the second end of the unlocking member is connected to the limiting component. When the seat backrest is in the unfolded state, the limiting component is adapted to lock the headrest frame so that the headrest frame is in the unfolded state. When the seat backrest is folded, when the seat backrest is adapted to rotate a set angle along the seat bottom plate, at this time, the unlocking member is adapted to release the locking of the limiting component on the headrest frame, and then the headrest frame folds and contracts under the action of elastic force.
[0006] Preferably, a fixed shaft is fixedly installed at the rear side of the seat bottom plate. The seat backrest is rotatably installed on the fixed shaft. A fixed strip is fixedly installed on the outside of the fixed shaft. The unlocking member is an unlocking rope. The first end of the unlocking rope is connected to the end of the fixed strip, and the second end of the unlocking rope is connected to the limiting component. When the seat backrest is in the unfolded state, the unlocking rope is in a relaxed state. When the seat backrest is folded, the unlocking rope is adapted to be tightened and act on the limiting component, thereby releasing the locking of the headrest frame.
[0007] Preferably, a fixing ring is sleeved and installed outside the mounting bracket. The fixing ring extends and bends upward along the radial direction to form a locking portion. The limiting assembly includes a limiting ring. The limiting ring is elastically rotatably installed in the headrest bracket and is parallel to the fixing ring correspondingly. The limiting ring extends and bends along the radial direction to form a locking groove. The second end of the unlocking rope penetrates into the headrest bracket and is connected to the outside of the limiting ring. When the locking groove is adapted to cooperate with the locking portion under the action of elastic force, the headrest bracket is in a locked state at this time. When the locking portion rotates under the drive of the unlocking rope and until it separates from the locking groove, the headrest bracket is in an unlocked state at this time.
[0008] Preferably, the limiting assembly further includes a limiting frame. The limiting frame is elastically rotatably installed in the headrest bracket through the bottom end and is perpendicular to the limiting ring. The limiting ring extends along the radial direction and away from the locking groove to form a convex portion. The second end of the unlocking rope is connected to the top end of the limiting frame. One side of the bottom end of the limiting frame abuts against the convex portion.
[0009] Preferably, the limiting assembly further includes a limiting piece. The limiting piece is elastically rotatably installed at the side of the headrest bracket through the first end. The unlocking rope is connected to the top end of the limiting frame and the second end penetrates through the headrest bracket and is connected to the second end of the limiting piece. A guiding ring is installed at the side of the headrest bracket. The guiding ring is sleeved outside the unlocking rope. When the headrest bracket is in the unlocked state, the limiting piece is adapted to abut against the guiding ring under the drive of the unlocking rope.
[0010] Preferably, the fixing ring extends downward along the radial direction to form a limiting portion. When the headrest bracket abuts against the first end of the limiting portion, the headrest bracket is in the unfolded state. When the headrest bracket abuts against the second end of the limiting portion, the headrest bracket is in the folded and stored state.
[0011] Preferably, the delayed flip pillow further includes a driving mechanism, a traction rope, and a roller body. The roller body is rotatably sleeved outside a fixed shaft. The first end of the traction rope is connected inside the roller body. The second end of the traction rope is connected to the headrest bracket. A guiding sleeve cooperating with the traction rope is installed outside the mounting bracket. The input end of the driving mechanism is connected to the seat back. The output end of the driving mechanism is connected to the roller body. When the seat back is folded, the driving mechanism is adapted to drive the roller body to rotate in a first direction, so that the traction rope pays out the rope. When the seat back is unfolded, the driving mechanism is adapted to drive the roller body to rotate in a second direction, so that the traction rope takes in the rope and drives the headrest bracket to unfold.
[0012] Preferably, the driving mechanism includes a toothed ring, a gear set and a cylinder body. The cylinder body is rotatably installed on the seat bottom plate through the first end and is coaxially arranged with the fixed shaft. The second end of the cylinder body is connected to the roller body. The toothed ring is fixedly installed on the seat backrest and is coaxially arranged with the fixed shaft. The toothed ring is installed inside the seat backrest. The gear set is installed on the seat bottom plate. The toothed ring and the cylinder body are cooperatively connected through the gear set. When the seat backrest rotates, the toothed ring is adapted to drive the roller body to rotate through the gear set.
[0013] Preferably, the gear set includes a first gear, a second gear and a third gear. The first gear is rotatably installed on the seat bottom plate through a rotating shaft and meshes with the toothed ring. The second gear is sleeved outside the cylinder body. The third gear is installed on the rotating shaft and meshes with the second gear.
[0014] Preferably, the gear set includes a first gear and a second gear. The first gear is rotatably installed on the seat bottom plate through a rotating shaft and meshes with the toothed ring. The second gear is sleeved outside the cylinder body and meshes with the first gear.
[0015] Compared with the prior art, the beneficial effects of the present application are as follows: By setting the mechanical structure cooperation of the limiting component and the unlocking piece, the present invention automatically flips after the seat flips a certain angle. That is, the delayed flipping of the headrest can make the folding safer, and no additional driving device is required, reducing the cost and improving the reliability. Description of the Drawings
[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.
[0017] Figure 2 It is a schematic diagram of the principle when the seat of the present invention is folded.
[0018] Figure 3 It is a schematic diagram of the internal structure of the seat backrest of the present invention.
[0019] Figure 4 It is a schematic diagram after the internal structure of the seat of the present invention is disassembled.
[0020] Figure 5 It is a schematic diagram of the overall mechanism for folding and unfolding the driving headrest of the present invention.
[0021] Figure 6 For the present invention Figure 5 Partial structure schematic diagram in
[0022] Figure 7 It is a schematic diagram of the internal structure of the headrest frame of the present invention.
[0023] Figure 8 Schematic diagram of the working principle of the unlocking rope when the seat backrest of the present invention rotates.
[0024] Figure 9 Schematic diagram of the state when the headrest frame of the present invention is unlocked.
[0025] Figure 10 Schematic diagram of the bottom structure of the headrest frame of the present invention.
[0026] Figure 11 Schematic diagrams of two extreme states of the rotation of the headrest frame of the present invention.
[0027] Figure 12 Overall schematic diagram of the driving member mechanism of the present invention.
[0028] Figure 13 Exploded structure schematic diagram of the driving mechanism of the present invention.
[0029] Figure 14 Schematic diagram of the first embodiment of the gear set of the present invention.
[0030] Figure 15 Schematic diagram of the second embodiment of the gear set of the present invention.
[0031] Figure 16 Schematic diagram of the internal structure state when the seat of the present invention is folded.
[0032] Figure 17 Schematic diagram of the working principle of each component after the seat of the present invention is unfolded.
[0033] In the figure: 1, seat bottom plate; 101, mounting seat; 2, seat backrest; 3, headrest body; 4, mounting frame; 401, support rod; 402, cross bar; 5, unlocking member; 501, unlocking rope; 6, driving mechanism; 601, toothed ring; 602, gear set; 6021, first gear; 6022, second gear; 6023, third gear; 603, cylinder body; 7, fixed shaft; 8, towing rope; 9, headrest frame; 10, fixing strip; 11, roller body; 12, limiting assembly; 1201, limiting ring; 1202, limiting frame; 1203, limiting piece; 13, guiding sleeve; 14, fixing ring; 15, locking groove; 16, protruding portion; 17, locking portion; 18, limiting portion; 19, flexible sleeve; 20, bearing seat; 21, fixing frame. Detailed implementation manners
[0034] Next, in combination with the detailed implementation manners, the present application will be further described. It should be noted that, on the premise of no conflict, any combination can be formed among the following described embodiments or technical features to form a new embodiment.
[0035] In the description of the present application, it should be noted that for orientation terms, such as the terms "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation and positional relationship are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.
[0036] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence.
[0037] Further analyze the problems that occur when the existing automotive seat headrests are actually used: In some cars with seven seats or even more seats, in some cases of use, the rear seats need to be folded to save space or facilitate passengers' entry and exit. As Figure 2 shown, it goes through two processes. The first process: rotate and fold the seat backrest 2 towards the seat bottom plate 1 for contraction; the second process: further rotate and fold the headrest body 3 on the seat backrest 2 downward for contraction; in this way, the folding and storage of the entire seat can be completed. In the existing method, the folding method of the headrest body 3 generally adopts a manual method, which is time-consuming and laborious and rather troublesome. Another method is to adopt an automatic folding method, which is generally applied in intelligent high-class cars, that is, both the seat backrest 2 and the headrest body 3 adopt driving devices (such as motors) for automatic folding control. However, for the headrest body 3 itself, its internal volume is small. Therefore, after installing the drive control system, there are problems such as poor heat dissipation, high cost, and complex structure, and thus it is not suitable for wide promotion and use.
[0038] Therefore, the inventor of the present application has developed a delayed flip headrest, and one of its embodiments is as Figures 1 to 17 shown, including a seat bottom plate 1, a seat backrest 2, a headrest frame 9, a limiting component 12, and an unlocking member 5. The seat backrest 2 is rotatably installed on the seat bottom plate 1, the headrest frame 9 can be elastically rotatably installed on the mounting frame 4 at the top of the seat backrest 2 through a torsion spring, and the headrest frame 9 is used for installing the headrest body 3. The limiting component 12 is installed in the headrest frame 9, the first end of the unlocking member 5 is connected to the seat bottom plate 1, and the second end of the unlocking member 5 is connected to the limiting component 12.
[0039] It can be understood that when the seat backrest 2 is in the unfolded state (i.e., the seat is in the use state), the limiting component 12 locks and limits the headrest frame 9 at this time, so that the headrest frame 9 is in the unfolded state (i.e., the headrest body 3 is in the use state), and the torsion spring on the headrest frame 9 is in the deformed energy storage state at this time. When the seat backrest 2 is folded, after the seat backrest 2 is rotated by a set angle along the seat bottom plate 1, the unlocking member 5 will release the locking of the limiting component 12 on the headrest frame 9 at this time, and then the headrest frame 9 will fold and contract under the action of (torsion spring) elastic force.
[0040] It can be seen that through the mechanical structure cooperation of the limiting component 12 and the unlocking member 5, the automatic folding and flipping function of the headrest frame 9 can be realized, which not only has a simple structure, but also does not require an additional driving device, reduces costs and improves reliability.
[0041] As a further description of the above embodiment: As Figure 3 shown, mounting seats 101 are installed at both sides of the rear end of the seat bottom plate 1, a fixed shaft 7 is fixedly installed between the two mounting seats 101, and the seat backrest 2 is rotatably arranged outside the fixed shaft 7, and a fixed strip 10 is fixedly installed outside the fixed shaft 7. The unlocking member 5 can adopt an unlocking rope 501, wherein the first end (i.e., the bottom end) of the unlocking rope 501 is connected to the end of the fixed strip 10, and the second end (i.e., the top end) of the unlocking rope 501 is connected to the limiting component 12.
[0042] The principle of how the unlocking rope 501 triggers the limiting component 12 is described below: As Figure 8 shown, when the seat backrest 2 is in the unfolded state, the unlocking rope 501 is in a relaxed state at this time. When the seat backrest 2 rotates clockwise, that is, the seat backrest 2 rotates around the axis of the fixed shaft 7, and the bottom end of the unlocking rope 501 is located on the left side of the axis of the fixed shaft 7. In this way, when the seat backrest 2 rotates, it will make the unlocking rope 501 gradually tighten. When a certain angle is reached, the tightened unlocking rope 501 will generate a pulling force and trigger the limiting component 12 at this time, thereby releasing the locking of the headrest frame 9.
[0043] It should be noted that as Figure 8 shown, we can set the set angle of the rotation of the seat backrest 2 as β, and the specific angle of β can be specifically set by those skilled in the art according to the actual situation. Exemplarily, β is seventy degrees, that is to say, after the seat backrest 2 rotates seventy degrees, the limiting component 12 can be triggered to release the locking of the headrest frame 9 at this time; of course, this angle can also be the limit angle after the seat backrest 2 is folded, that is to say, after the seat backrest 2 is folded and contracted on the seat bottom plate 1, the headrest frame 9 just releases the locking and automatically folds under the action of the elastic force.
[0044] It should be added that why there is a delayed flip after the seat flips by a certain angle here. Because if the headrest is unlocked at the initial stage of the flip of the seat backrest 2, since the headrest body 3 is folded under the action of elastic force, the reset force is instantaneous and large at this time, which will generate a large impact force and the safety is not good; moreover, since the unlocking rope 501 gradually tightens with the flip angle of the seat backrest 501 as described above, the unlocking rope 501 is also prone to break.
[0045] In one embodiment of the present application, as Figure 5 and Figure 6 shown, the mounting bracket 4 includes a cross bar 402 and a pair of support rods 401, wherein the support rods 401 are symmetrically installed at the top position of the seat backrest 2, and the cross bar 402 is fixedly installed at the top positions of the two support rods 401, and the headrest frame 9 is rotatably installed at an external position of the cross bar 402. A fixing ring 14 is fixedly sleeved and installed outside the cross bar 402. As Figure 7 shown, the fixing ring 14 extends and bends upward along the radial direction to form a locking portion 17. The limiting component 12 includes a limiting ring 1201. The limiting ring 1201 can be elastically rotatably installed in the headrest frame 9 through a torsion spring, and the limiting ring 1201 corresponds to and is parallel to the fixing ring 14. The limiting ring 1201 extends and bends at the lower left position along the radial direction to form a locking groove 15, and the top end of the unlocking rope 501 penetrates into the headrest frame 9 and is connected to the outside of the limiting ring 1201.
[0046] It can be understood that when the locking groove 15 cooperates with the locking portion 17 under the elastic force of the torsion spring, that is, the locking portion 17 and the locking groove 15 are snap-fitted, the rotation of the headrest frame 9 can be restricted. At this time, the headrest frame 9 is in the expanded locked and limited state. When the seat backrest 2 rotates and folds, that is, the unlocking rope 501 generates a pulling force on the limiting ring 1201, which causes the limiting ring 1201 to rotate until the locking portion 17 is separated from the locking groove 15. As Figure 9 shown, at this time, the headrest frame 9 will be in the unlocked state and will automatically fold under the action of elastic force. Of course, during the automatic folding process of the headrest frame 9, a certain pulling force will also be generated on the unlocking rope 501, that is, the unlocking rope 501 will drive the locking portion 17 to rotate in a direction farther away from the locking groove 15, so that the unlocking rope 501 will not interfere during the folding process of the headrest frame 9.
[0047] It is worth mentioning that the above-mentioned embodiments can actually also adopt the following variant embodiments: that is, the headrest frame 9 still adopts the installation method of elastic rotation by a torsion spring, and the headrest frame 9 is also limited by elastic force during normal use. At this time, the top end of the unlocking rope 501 is connected to the headrest frame 9, and the installation method of the bottom end of the unlocking rope 501 remains unchanged (or a similar installation method, so that a pulling force is generated on the unlocking rope 501 when the seat backrest 2 rotates); and the limiting component 12 is omitted here. Its working principle is: when the seat backrest 2 rotates and folds, the unlocking rope 501 will generate a pulling force, and then pull and fold the unfolded headrest frame 9. That is to say, during the process of gradually rotating and folding the seat backrest 2, the taut unlocking rope 501 will gradually pull the headrest frame 9 to rotate and fold; when the seat backrest 2 is unfolded, the unlocking rope 501 will gradually loosen, and at this time the headrest frame 9 gradually returns to its original position under the action of elastic force.
[0048] It should be noted that although the structure in the above-mentioned variant embodiment is simpler and can also achieve the function of automatic folding and resetting of the headrest frame 9, it has the following disadvantages: ① The unlocking rope 501 needs to bear a greater force. During the folding process of the headrest frame 9, the unlocking rope 501 needs to overcome the elastic force of the torsion spring; and when in the folded state, the unlocking rope 501 is always in a taut state, and maintaining this state for a long time will greatly reduce the service life of the unlocking rope 501. ② The unlocking rope 501 needs a greater stroke. As Figure 8 shown, it should be known that the greater the distance between the bottom end of the unlocking rope 501 and the left side of the axis of the fixed shaft 7, the greater the relative displacement generated at the second end of the unlocking rope 501 when the seat backrest 2 rotates; therefore, if the unlocking rope 501 is directly used to drive the rotation and folding of the headrest frame 9, a long fixing strip 10 may be required, which in turn requires a larger installation space inside the lower end of the seat backrest 2. By adopting the design with the limiting component 12 and other designs in the present design, the unlocking rope 501 only plays a triggering role and does not need to bear a large force, and has a high service life; and the stroke of the unlocking rope 501 is also relatively small, which can save the installation space inside the lower end of the seat backrest 2 and improve the space utilization rate.
[0049] In one of the embodiments of the present application, as Figure 7 shown, the limiting component 12 further includes a limiting frame 1202, and the limiting frame 1202 is rotatably installed at the bottom end inside the headrest frame 9 and is perpendicular to the limiting ring 1201. The limiting frame 1202 can also be elastically connected to the headrest frame 9 through a torsion spring. The limiting ring 1201 extends along the radial direction and away from the locking groove 15 to form a convex portion 16; the second end of the unlocking rope 501 is connected to the top end of the limiting frame 1202, and one side of the bottom end of the limiting frame 1202 is in abutting cooperation with the convex portion 16.
[0050] It can be understood that when the seat backrest 2 rotates and folds, that is, the unlocking rope 501 will exert a pulling force on the top of the limiting frame 1202. Then, the limiting frame 1202 will rotate along the bottom end, and the bottom end of the limiting frame 1202 will squeeze the convex part 16 of the limiting ring 1201, and drive the limiting ring 1201 to rotate to unlock the headrest. It should be noted that why the limiting ring 1201 is driven by the limiting frame 1202 to unlock here? The reason is as Figures 5 to 7 shown, the unlocking rope 501 passes through the support rod 401, and then enters the inside of the headrest frame 9 from the side of the headrest frame 9. The limiting frame 1202 is parallel to the side of the headrest frame 9. Therefore, the unlocking rope 501 needs to enter from the side hole of the headrest frame 9 and be connected to the lower limiting frame 1202. At this time, the unlocking rope 501 will have a large bend, and thus the unlocking rope 501 will generate a large frictional force; on the other hand, we know that the front-to-back thickness of the headrest frame 9 must be less than its left-to-right or up-and-down length. The pulling of the unlocking rope 501 to rotate the limiting frame 1202 can be similar to the lever principle, that is, the farther the connection point of the unlocking rope 501 and the limiting frame 1202 is from the rotation center of the limiting frame 1202, the more labor-saving it is. And the front-to-back distance inside the headrest frame 9 is limited. Therefore, it is not suitable to set the length of the limiting ring 1201 long enough. Therefore, here, a longer limiting frame 1202 can be set in the left-right and up-down spaces inside the headrest frame 9 to transmit the force, so that the unlocking rope 501 will receive a smaller acting force when the headrest frame 9 is unlocked; at the same time, after the unlocking rope 501 passes through the headrest frame 9 and is connected to the limiting frame 1202, it is in an approximately horizontal state, which further reduces the bending state of the unlocking rope 501, avoids excessive friction and wear of the unlocking rope 501 inside the headrest frame 9, and improves the durability and reliability of the overall structure.
[0051] Further preferably, as Figure 6 shown, the limiting component 12 further includes a limiting piece 1203. The limiting piece 1203 is elastically rotatably installed at the side of the headrest frame 9 through the first end. Specifically, a pin body can be rotatably installed inside the headrest frame 9 through a torsion spring. The pin body extends to the side of the headrest frame 9 and is connected to the first end of the limiting piece 1203, thereby forming the elastic rotational installation of the limiting piece 1203. The unlocking rope 501 is connected to the top of the limiting frame 1202 and the second end passes through the headrest frame 9 and is connected to the second end of the limiting piece 1203. A guiding ring is installed on the side of the headrest frame 9, and the guiding ring is sleeved outside the unlocking rope 501.
[0052] It can be understood that at this time, the second end of the unlocking rope 501 is equivalent to having two connection points, that is, the second end position of the unlocking rope 501 is connected to both the limit frame 1202 and the limit piece 1203. It has the following advantages: ① Improve the connection stability at the second end of the unlocking rope 501; on the other hand, assuming that the connection point with the limit piece 1203 is disengaged, normal use can still be ensured at this time; assuming that the connection point with the limit frame 1202 is disengaged, that is, the headrest body 3 cannot be used normally at this time, but at this time the second end of the unlocking rope 501 is still located at the position of the headrest and will not cause the overall disengagement of the unlocking rope 501 and retract into the seat backrest 2, which is convenient for later maintenance, that is, only the headrest needs to be disassembled at this time. It should be noted that the above disengagement does not refer to the breakage of the unlocking rope 501, but the disengagement of the connection point. ② The abutting cooperation between the limit piece 1203 and the guide ring can limit the maximum rotation angle of the limit frame 1202, that is to say, when the limit piece 1203 abuts against the guide ring, the limit frame 1202 rotates to the maximum angle at this time; this can avoid the excessive rotation of the limit frame 1202, and further prevent the excessive rotation of the limit ring 1201 and the resulting collision or damage with the fixed ring 14. ③ Since both the limit piece 1203 and the limit frame 1202 are elastically rotatably installed through torsion springs, that is to say, when the unlocking rope 501 is slack, both of them will reset under the action of elastic force, and the design of the limit piece 1203 provides a guarantee for the reset of the limit frame 1202. For example, if the torsion spring on the limit frame 1202 fails, it can still play a reset function under the elastic force of the limit piece 1203 at this time.
[0053] Further preferably, as Figure 9 shown, the fixing ring 14 extends downward along the radial direction to form a limiting portion 18. It can be understood that, as Figure 10 and Figure 11 shown in (a) therein, when the headrest frame 9 rotates and abuts against the first end (i.e., the left end) of the limiting portion 18, the headrest frame 9 is in the unfolded state at this time. As Figure 11 shown in (b) therein, when the headrest frame 9 rotates and abuts against the second end (right end) of the limiting portion 18, the headrest frame 9 is in the folded and stored state at this time. That is to say, through the design of the limiting portion 18, the maximum rotation angles of the headrest frame 9 in two directions are limited, thereby avoiding the situation of excessive flipping or damage of the headrest frame 9 during the rotation process, and improving the stability and safety of the overall structure.
[0054] Based on the above embodiments, there will be such a problem when it is used: that is, after the seat backrest 2 is folded at a certain angle, the headrest body 3 can be automatically folded under the action of elastic force. However, after the seat backrest 2 is unfolded, the headrest body 3 needs to be manually reset, as Figure 7As shown, it is necessary to rotate the headrest frame 9 until the locking portion 17 and the locking groove 15 are engaged again, so as to realize the expansion and locking of the headrest body 3, which is rather cumbersome and inconvenient.
[0055] Therefore, to solve the above technical problems, in one embodiment of the present application, as Figure 5 shown, the delayed flip pillow further includes a drive mechanism 6, a traction rope 8 and a roller body 11. The roller body 11 is rotatably sleeved outside the fixed shaft 7. The first end of the traction rope 8 is connected to the inside of the roller body 11, and the second end of the traction rope 8 is connected to the headrest frame 9. A guide sleeve 13 cooperating with the traction rope 8 is installed outside the mounting bracket 4; the input end of the drive mechanism 6 is connected to the seat backrest 2, and the output end of the drive mechanism 6 is connected to the roller body 11, that is, the drive mechanism 6 is installed between the seat backrest 2 and the seat bottom plate 1.
[0056] It can be understood that when the seat backrest 2 rotates and folds, the seat backrest 2 will act on the drive mechanism 6 at this time, and then the drive mechanism 6 will drive the roller body 11 to rotate in the first direction (clockwise), that is, at this time the roller body 11 pays out the traction rope 8, which also prevents interference with the subsequent folding of the headrest; of course, when the headrest is completely folded, the traction rope 8 is also in the maximum straightened state at this time. When the seat backrest 2 rotates and unfolds, the drive mechanism 6 will drive the roller body 11 to rotate in the second direction (counterclockwise) under the action of the seat backrest 2, that is, at this time the roller body 11 takes in the traction rope 8, and then pulls and unfolds the headrest frame 9 through the traction rope 8 to realize the function that the headrest body 3 can also be automatically unfolded after the seat backrest 2 is unfolded.
[0057] The present application does not specifically limit the structure of the drive mechanism 6. The following provides a specific embodiment for reference: As Figure 12 shown in (c) and (d) of, the drive mechanism 6 includes a toothed ring 601, a gear set 602 and a cylinder body 603. A bearing seat 20 is fixedly installed at the mounting seat 101 of the seat bottom plate 1, and the first end of the cylinder body 603 is installed in the bearing seat 20, and the cylinder body 603 is coaxially arranged with the fixed shaft 7. The second end of the cylinder body 603 is connected to the roller body 11; the toothed ring 601 is fixedly installed in the seat backrest 2, and the toothed ring 601 and the fixed shaft 7 are also coaxially arranged; the gear set 602 is installed on the mounting seat 101, and the toothed ring 601 and the cylinder body 603 are connected and cooperated through the gear set 602.
[0058] It can be understood that when the seat backrest 2 unfolds or folds, the seat backrest 2 will rotate along the axis of the fixed shaft 7 at this time, and then the toothed ring 601 will also rotate synchronously. The toothed ring 601 acts on the gear set 602, and the gear set 602 acts on the cylinder body 603 to rotate, and the cylinder body 603 will drive the roller body 11 to take in or pay out the rope.
[0059] The structure of the gear set 602 has multiple forms, including but not limited to the following two: Structure one: As shown in Figure 14 , the gear set 602 includes a first gear 6021, a second gear 6022, and a third gear 6023. The first gear 6021 is rotatably mounted on the mounting seat 101 of the seat bottom plate 1 through a rotating shaft, and the first gear 6021 meshes with the inside of the tooth ring 601. The second gear 6022 is fixedly sleeved outside the cylinder body 603, and the third gear 6023 is mounted on the rotating shaft and meshes with the second gear 6022.
[0060] It can be understood that when the seat backrest 2 drives the tooth ring 601 to rotate, the tooth ring 601 acts on the first gear 6021 to rotate. The first gear 6021 drives the third gear 6023 to rotate synchronously through the rotating shaft, the third gear 6023 drives the second gear 6022 to rotate, and the second gear 6022 drives the cylinder body 603 to rotate, thereby realizing the rotation of the roller 11.
[0061] Structure two: As shown in Figure 15 , the gear set 602 includes a first gear 6021 and a second gear 6022. The first gear 6021 is rotatably mounted on the mounting seat 101 of the seat bottom plate 1 through a rotating shaft, and the first gear 6021 meshes with the inside of the tooth ring 601. The second gear 6022 is fixedly sleeved outside the cylinder body 603, and the second gear 6022 meshes with the first gear 6021.
[0062] It can be understood that when the seat backrest 2 drives the tooth ring 601 to rotate, the tooth ring 601 acts on the first gear 6021 to rotate, the first gear 6021 acts on the second gear 6022 to rotate, and the second gear 6022 drives the cylinder body 603 to rotate, thereby realizing the rotation of the roller 11.
[0063] It should be known that, as shown in Figure 2As shown, when the seat backrest 2 is folded, its rotation angle is not very large, and the connection point between the traction rope 8 and the headrest frame 9 and the travel of the traction rope 8 need to be considered, so that the traction rope 8 can drive the headrest frame 9 to rotate and reset with less effort and smoothly. Therefore, it is necessary to ensure that the travel of the traction rope 8 is sufficient. The design of the gear set 602 can magnify the number of turns of the roller 11, so that the traction rope 8 can meet the actual requirements of winding and unwinding. For Structure 1 and Structure 2, since Structure 1 uses one more gear than Structure 2, under the same magnification ratio, the overall structure of the toothed ring 601 and the gear set 602 used in Structure 1 can be smaller, which can ensure the compact installation of the device in the seat backrest 2; for Structure 2, its structure is simpler. Therefore, both structures can meet the actual requirements, and those skilled in the art can choose according to the actual situation.
[0064] It is worth mentioning that after the seat backrest 2 is rotated and opened, the headrest body 3 will also automatically unfold under the action of the traction rope 8, and the unfolded headrest body 3 will be locked under the action of the limit ring 1201, and the headrest body 3 will also be locked under the action of the tightened traction rope 8, thus playing a dual limiting role and improving the stability and safety of the headrest body 3 after unfolding.
[0065] As Figure 13 shown, the gear set 602 can be designed in multiple groups, which are evenly distributed along the circumferential direction of the fixed shaft 7. For the convenience of installation, as Figure 13 shown, a pair of spaced and annular fixed brackets 21 can be fixedly installed on the mounting seat 101 of the seat bottom plate 1 by bolts, and corresponding gears are rotatably installed between the two fixed brackets 21 through a rotating shaft; this is to improve the stability of the entire drive mechanism 6 and the smoothness of the driving force transmission, and ensure that during the rotation of the seat backrest 2, the drive mechanism 6 can stably and smoothly drive the roller 11 to wind or unwind the rope. Of course, on the premise of ensuring smooth transmission, considering the cost, as Figure 14 and Figure 15 shown, the gear set 602 can also be designed as a single group. Since the rotation angle of the seat backrest 2 is limited, it rotates only about one-quarter of a turn. Therefore, the number of teeth inside the toothed ring 601 can be set as missing teeth. For example, teeth are arranged on half of the inside of the toothed ring 601, and the other half is smooth, which can reduce the processing procedures of the toothed ring 601 and further reduce the cost.
[0066] In this embodiment, as Figure 7 and Figure 10As shown in the figure, in order to further reduce the wear caused by the hard extrusion between components, for example, a flexible sleeve 19 is provided at the mating part of the limit frame 1202 and the protrusion 16, a flexible sleeve 19 is provided at the mating part of the limit frame 1202 and the headrest frame 9, and a flexible sleeve 19 is provided at the mating part of the headrest frame 9 and the limit part 18. The setting of the flexible sleeve 19 can not only effectively reduce the wear between components, improve the durability of the overall structure, but also reduce the noise generated by component friction to a certain extent, thus enhancing the user experience. At the same time, the material of the flexible sleeve 19 is preferably a wear-resistant and elastic material, such as rubber or silicone, to ensure that it can maintain good performance during use.
[0067] The working principle of the present invention is as follows: ① As Figure 1 shown, it is the unfolded state of the entire seat, that is, both the seat backrest 2 and the headrest body 3 are in the unfolded state.
[0068] ② As Figure 2 shown, the seat is folded, that is, the seat backrest 2 rotates and folds towards the position close to the seat bottom plate 1; as Figure 8 shown, during the folding process of the seat backrest 2, the unlocking rope 501 is also gradually tightened. When the seat backrest 2 is folded to the limit position or close to the limit position, as Figure 7 shown, at this time, the unlocking rope 501 will pull the limit frame 1202 to rotate, and then the bottom end of the limit frame 1202 will squeeze the protrusion 16, so that the limit ring 1201 rotates, and the locking groove 15 and the locking part 17 are separated (as Figure 9 shown), thus unlocking the headrest frame 9, and the headrest frame 9 will automatically fold under the action of (the torsion spring) elastic force. Of course, during the rotation and folding process of the seat backrest 2, as Figure 12 shown, the toothed ring 601 will rotate around the axis of the fixed shaft 7, the toothed ring 601 acts on the gear set 602, the gear set 602 acts on the cylinder body 603, and the cylinder body 603 drives the roller body 11 to rotate and relax the traction rope 8, which is also to prepare for the folding of the headrest frame 9 later.
[0069] ③ The seat is unfolded, as shown by the arrow in Figure 17 , that is, the seat backrest 2 rotates and unfolds towards the position far from the seat bottom plate 1. Similarly, conversely, the toothed ring 601 will drive the roller body 11 to reverse through the gear set 602, thereby tightening the traction rope 8 and gradually pulling and unfolding the folded headrest body 3; when the seat bottom plate 1 rotates to the fully unfolded position, at this time, the headrest body 3 is also just in the fully unfolded position under the action of the traction rope 8. Of course, during the rotation and unfolding process of the seat backrest 2, as Figure 8As shown, at this time, the unlocking rope 501 will also change from a taut state to a relaxed state, and then the limiting ring 1201, the limiting frame 1202, and the limiting piece 1203 will all rotate and reset under the action of elastic force, as Figure 7 shown, that is, the locking groove 15 and the locking portion 17 will cooperate again to lock the headrest frame 9, thereby completing the automatic unfolding process of the headrest after the seat is unfolded.
[0070] The above describes the basic principle, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.
Claims
1. A delayed flip headrest, characterized in that, Comprising: Seat floor board; Seat backrest, which is rotatably mounted on the seat floor board; Headrest frame, which is elastically rotatably mounted on the mounting frame at the top of the seat backrest; Limiting component, which is mounted inside the headrest frame; And Unlocking member, the first end of which is connected to the seat floor board, and the second end of which is connected to the limiting component; When the seat backrest is in the unfolded state, the limiting component is adapted to lock the headrest frame so that the headrest frame is in the unfolded state; When folding the seat backrest, when the seat backrest is adapted to rotate by a set angle along the seat floor board, at this time the unlocking member is adapted to release the locking of the headrest frame by the limiting component, and then the headrest frame folds and contracts under the action of elastic force.
2. The delayed flip headrest according to claim 1, wherein: A fixed shaft is fixedly mounted at the rear side of the seat floor board, the seat backrest is rotatably mounted on the fixed shaft, and a fixed strip is fixedly mounted on the outside of the fixed shaft; the unlocking member is an unlocking rope, the first end of which is connected to the end of the fixed strip, and the second end of which is connected to the limiting component; When the seat backrest is in the unfolded state, the unlocking rope is in a relaxed state; when folding the seat backrest, the unlocking rope is adapted to be tightened and act on the limiting component, thereby releasing the locking of the headrest frame.
3. The delayed flip headrest according to claim 2, characterized in that: A fixed ring is sleeved and mounted on the outside of the mounting frame, and the fixed ring extends and bends upward in the radial direction to form a locking portion; the limiting component includes a limiting ring, which is elastically rotatably mounted inside the headrest frame and is parallel to the fixed ring correspondingly, the limiting ring extends and bends in the radial direction to form a locking groove, and the second end of the unlocking rope penetrates into the headrest frame and is connected to the outside of the limiting ring; When the locking groove is adapted to cooperate with the locking portion under the action of elastic force, at this time the headrest frame is in the locked state; when the locking portion rotates under the drive of the unlocking rope until it separates from the locking groove, at this time the headrest frame is in the unlocked state.
4. The delayed flip headrest according to claim 3, wherein: The limiting component further includes a limiting frame, which is elastically rotatably mounted inside the headrest frame through the bottom end and is perpendicular to the limiting ring, and the limiting ring extends in the radial direction and away from the locking groove to form a protruding portion; the second end of the unlocking rope is connected to the top end of the limiting frame, and one side of the bottom end of the limiting frame abuts against the protruding portion.
5. The delayed flip headrest according to claim 4, wherein: The limiting component further includes a limiting piece, which is elastically rotatably mounted on the side of the headrest frame through the first end; the unlocking rope is connected to the top end of the limiting frame and the second end penetrates through the headrest frame and is connected to the second end of the limiting piece, and a guiding ring is mounted on the side of the headrest frame, and the guiding ring is sleeved on the outside of the unlocking rope; when the headrest frame is in the unlocked state, the limiting piece is adapted to abut against the guiding ring under the drive of the unlocking rope.
6. The delayed flip headrest according to claim 5, characterized in that: The fixing ring extends downward along the radial direction to form a limiting portion; when the headrest frame abuts against the first end of the limiting portion, the headrest frame is in the unfolded state; when the headrest frame abuts against the second end of the limiting portion, the headrest frame is in the folded and stored state.
7. The delayed flip headrest according to any one of claims 1-6, characterized in that: The delayed flip pillow further includes a driving mechanism, a traction rope, and a roller body. The roller body is rotatably sleeved outside the fixed shaft. The first end of the traction rope is connected inside the roller body, and the second end of the traction rope is connected to the headrest frame. A guide sleeve cooperating with the traction rope is installed outside the mounting frame; the input end of the driving mechanism is connected to the seat backrest, and the output end of the driving mechanism is connected to the roller body; When the seat backrest is folded, the driving mechanism is adapted to drive the roller body to rotate in a first direction, so that the traction rope pays out; when the seat backrest is unfolded, the driving mechanism is adapted to drive the roller body to rotate in a second direction, so that the traction rope takes in and drives the headrest frame to unfold.
8. The delayed flip headrest according to claim 7, wherein: The driving mechanism includes a toothed ring, a gear set, and a cylinder body. The cylinder body is rotatably installed on the seat bottom plate through the first end and is coaxially arranged with the fixed shaft. The second end of the cylinder body is connected to the roller body. The toothed ring is fixedly installed on the seat backrest and is coaxially arranged with the fixed shaft. The toothed ring is installed inside the seat backrest. The gear set is installed on the seat bottom plate. The toothed ring and the cylinder body are cooperatively connected through the gear set; when the seat backrest rotates, the toothed ring is adapted to drive the roller body to rotate through the gear set.
9. The delayed flip headrest according to claim 8, characterized in that: The gear set includes a first gear, a second gear, and a third gear. The first gear is rotatably installed on the seat bottom plate through a rotating shaft and meshes with the toothed ring. The second gear is sleeved outside the cylinder body. The third gear is installed on the rotating shaft and meshes with the second gear.
10. The delayed flip headrest according to claim 8, characterized in that: The gear set includes a first gear and a second gear. The first gear is rotatably installed on the seat bottom plate through a rotating shaft and meshes with the toothed ring. The second gear is sleeved outside the cylinder body and meshes with the first gear.