Automobile backseat headrest folding mechanism
By designing a rear seat headrest folding mechanism for automobiles, which uses cables and buttons to achieve automatic folding and locking of the headrest, the problems of obstructed vision and limited folding angle in existing technologies have been solved, enabling smooth folding of the seat back and unobstructed driver vision.
Patent Information
- Application Number
- CN202520153941.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-01-22
AI Technical Summary
Existing car rear seat headrests tend to obstruct vision and affect the folding angle of the backrest when the seat back is folded, and it is impossible to achieve automatic locking and unlocking of the headrest without adding a compensator.
A car rear seat headrest folding mechanism was designed, which realizes automatic folding of the headrest through two methods: cable and button. The lever principle and return spring ensure that the headrest is not obstructed when the seat back is folded, and automatically locks after unlocking.
It achieves automatic locking and unlocking of the headrest without adding a compensator, avoiding affecting the folding angle of the seat back, ensuring that the driver's vision is not obstructed, and is simple in structure and easy to operate.
Smart Images
Figure CN223644657U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to car seat headrests, and more particularly to a folding mechanism for a rear seat headrest. Background Technology
[0002] As the automotive industry continues to advance, customers' demands for car interiors are also increasing. Headrests are an indispensable item in car interiors, used not only in the front seats but also increasingly in the rear seats. While rear seat headrests can increase passenger comfort, they also present several problems. For example, the headrest increases the height of the seat back, which can easily obstruct the driver's view of the rear of the car through the rear windshield, especially when no one is sitting in the back seat, in which case the headrest is unnecessary. Furthermore, because the headrest is integrated with the rear seat back, which is typically designed to fold forward to increase trunk storage space, the limited distance between the front and rear seats means that when the rear seat back is folded forward, the rear headrest will touch the front seat back, affecting the folding angle and preventing the backrest from folding down completely. Summary of the Invention
[0003] This utility model provides a car rear seat headrest folding mechanism to address the shortcomings of existing technology. The folding mechanism can automatically fold the seat backrest by means of a cable mechanism, or it can fold the rear seat headrest by means of a button. The cable does not require a compensator and can automatically lock when the headrest is in its original position.
[0004] To achieve the above technical objectives, this utility model provides a car rear seat headrest folding mechanism, which is installed at the connection between the backrest and headrest of the car seat. An inverted U-shaped headrest rod is fixedly installed on the top of the backrest support of the car seat. The headrest support is rotatably installed on the horizontal bar of the headrest rod. The backrest support is rotatably connected to the seat cushion support of the car seat. The folding mechanism includes a headrest unlocking rod, a headrest pull rod, a locking mechanism, and a pull cord unlocking mechanism. The headrest unlocking rod includes a horizontal part and a vertical part. The part where the horizontal part and the vertical part turn is installed on the front cover of the headrest through a pivot. A first protrusion is provided at the end of the horizontal part. One end of the headrest pull rod is connected to the horizontal part of the headrest unlocking rod, and the other end is connected to the locking mechanism. The locking mechanism includes an upper locking plate and a lower locking plate. The upper locking plate is rotatably installed at the end of the headrest pull rod. The lower locking plate is fixed on the horizontal bar of the headrest rod. A locking block is provided on the upper part of the lower part of the upper locking plate, and a locking groove matching the locking block is provided on the lower part of the upper locking plate.
[0005] The pull-cord unlocking mechanism includes a headrest pull cable and a pull cable wheel located at the end of the transverse portion of the headrest unlocking rod. The pull cable wheel is rotatably mounted on the headrest front cover. One end of the headrest pull cable is fixedly wound around the pull cable wheel, and the other end extends from the lower part of the headrest and extends and is fixed to the seat cushion support of the car seat. The pull cable wheel is provided with a second protrusion that is arc-shaped, fan-shaped, or semi-circular. During the rotation of the pull cable wheel, the second protrusion contacts the first protrusion and provides an upward thrust to the first protrusion.
[0006] The preferred technical solution of this utility model is as follows: the folding mechanism further includes an unlocking button, which is installed on the outside of the vertical part of the headrest unlocking rod. A button mounting groove is correspondingly provided on the side of the headrest front cover. The unlocking button is slidably installed in the button mounting groove, and the output end of the unlocking button is directly opposite the vertical part of the headrest unlocking rod. The unlocking button is provided with a first return spring.
[0007] The preferred technical solution of this utility model is as follows: a locking plate support rod is fixedly installed at the position of the upper locking plate on the front cover of the headrest. The upper locking plate is rotatably installed on the locking plate support rod. Second return springs are symmetrically provided on both sides of the lower locking plate. The second return springs are sleeved on the crossbar of the headrest rod, with one end connected to the lower locking plate and the other end connected to the locking plate support rod.
[0008] The preferred technical solution of this utility model is as follows: a third return spring is installed on the headrest unlocking rod. The third return spring is sleeved on the rotating shaft of the headrest unlocking rod, and one end is connected to the headrest unlocking rod, while the other end is connected to the headrest front cover.
[0009] The preferred technical solution of this utility model is as follows: a fourth return spring is sleeved on the shaft of the cable wheel, one end of the fourth return spring is connected to the cable wheel, and the other end is connected to the front cover of the headrest.
[0010] The preferred technical solution of this utility model is as follows: A pull rod mounting part is provided at the center of the horizontal part of the headrest unlocking rod. The pull rod mounting part is rotatably mounted on the headrest unlocking rod. The pull rod mounting part includes an internal rotating rod and an enlarged end cap at the end of the rotating rod. The length of the internal rotating rod of the pull rod mounting part matches the thickness of the headrest pull rod. An installation groove matching the shape and size of the enlarged end cap at the outer end of the pull rod mounting part is provided on the headrest pull rod. The headrest pull rod is sleeved with the enlarged end cap of the pull rod mounting part through its installation groove. After sleeved, the pull rod mounting part is rotated to fix it.
[0011] The preferred technical solution of this utility model is that both the locking slot and the locking block are provided with a certain tilt angle, and the tilt angles of the two are matched.
[0012] The preferred technical solution of this utility model is that the outer arc length of the second protrusion is sufficient to meet the stretching length of the headrest cable when the car seat back can continue to be folded down completely after the headrest is folded.
[0013] The preferred technical solution of this utility model is as follows: The unlocking button includes a pressing end cover and a pressing rod. The pressing end cover is located on the side of the headrest, and the pressing rod extends into the plastic part of the headrest, with its end facing the vertical part of the headrest unlocking rod. The first return spring is sleeved on the pressing rod, with one end connected to the pressing end cover and the other end fixed in the button mounting groove. When the unlocking button is pressed, the pressing rod extends out of the button mounting groove and provides a downward rotating thrust to the vertical part of the headrest unlocking rod. Under the action of the lever principle, the vertical part of the headrest unlocking rod rotates downward, and the horizontal part of the headrest unlocking rod rotates upward, driving the headrest pull rod and the upper locking plate to rotate upward, so that the locking block at the lower part of the upper locking plate disengages from the locking slot on the lower locking plate, thereby unlocking it.
[0014] The beneficial effects of this utility model are:
[0015] (1) The folding mechanism of this utility model includes a headrest unlocking rod, a headrest pull rod and a locking mechanism. The headrest unlocking rod is a 7-shaped structure composed of a horizontal part and a vertical part, and is designed using the lever principle. The middle part is fixed to the front cover of the headrest through a pivot. The headrest pull rod is connected to its horizontal part. Through its special structural design, it can be unlocked by two different methods, namely a button or a pull cable. The headrest pull rod and the headrest unlocking rod are easy to assemble. The headrest unlocking rod is equipped with a return spring, which can drive the headrest pull rod and the locking mechanism to automatically return to their original position and lock when the external force is released.
[0016] (2) The present invention is provided with a pull rope unlocking mechanism, which includes a headrest pull rope and a pull rope wheel. The pull rope wheel is located at the end of the horizontal part of the headrest unlocking rod. A protrusion matching the headrest unlocking rod is provided on the pull rope wheel. One end of the pull rope is fixed on the pull rope wheel and the other end is fixed on the backrest bracket. When the backrest bracket is folded and rotated along the seat bracket, the headrest pull rope is automatically pulled to drive the pull rope wheel to rotate. During the rotation, the protrusion pushes the horizontal part of the headrest unlocking rod upward, thereby unlocking the headrest pull rod and avoiding obstruction between the headrest and the front seat backrest when the backrest is folded forward, thus affecting the folding angle of the rear seat backrest.
[0017] (3) The present invention is also provided with an unlocking button. The unlocking button is located in the vertical area of the headrest unlocking rod. When the vertical area of the headrest unlocking rod is pushed, the horizontal area of the headrest unlocking rod is raised by lever principle, thereby unlocking the headrest rod. This makes it convenient to fold the headrest when there is no one in the back seat, so as to avoid affecting the driver's line of sight when observing the rear of the vehicle through the rear windshield.
[0018] (4) The protrusion on the cable wheel of this utility model is set as an arc or semi-circle with the same center as the wheel. The outer circle length of the protrusion can match the length of the cable stretching when the seat back is fully folded, ensuring that the seat back can continue to be folded down after the headrest is unlocked without adding any compensator, and the headrest can always be kept in the unlocked state during the folding process.
[0019] (5) The locking mechanism of this utility model includes an upper locking plate connected to the headrest pull rod and a lower locking plate installed on the headrest crossbar. One end of the upper locking plate is rotatably installed on the front cover of the headrest, and the other end is provided with a locking groove. The lower locking plate is fixed on the headrest crossbar, and a locking block matching the locking groove is provided above it. When the pull cable is pulled or the button is pressed, the upper locking plate and the lower locking plate can be pulled apart and unlocked by the headrest pull rod. The lower locking plate is provided with return springs on both sides, and the other end of the return spring is connected to the mounting rod of the upper locking block. It can automatically return to the locking position when the headrest unlocking rod releases the push force of the button or the pull force of the pull cable.
[0020] (6) The locking slot and locking block of this utility model are both provided with a certain tilt angle, and the tilt angles of the two are matched and can be easily locked. When the headrest frame is subjected to a forward external force in the locked state, the locking block will be subjected to a backward force from the locking slot. The torque is 0 through the center of the rotation axis, and the locking block will not disengage from the locking slot. Similarly, when the headrest frame is subjected to a backward external force, the locking block will be subjected to a forward force from the locking slot. The torque is 0 through the center of the rotation axis, and the locking block will not disengage from the locking slot.
[0021] (7) The headrest unlocking rod and the cable wheel of this utility model are both equipped with return springs. The return spring on the headrest unlocking rod can always press the unlocking rod to rotate clockwise until the button is unlocked or the cable is pulled to unlock. When the external force is released, the return spring can drive the headrest unlocking rod to return automatically. The return spring on the cable wheel always presses the wheel to rotate counterclockwise. When the cable pulls the wheel, the rotation can be forward. When the tension is released, the cable wheel can return automatically. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of this utility model in the locked state;
[0023] Figure 2 yes Figure 1 AA cross-section view;
[0024] Figure 3 This is a side view of the locking mechanism of this utility model in the locked state;
[0025] Figure 4 This is a schematic diagram of the pull-cord unlocking state of this utility model;
[0026] Figure 5 yes Figure 4 Cross-sectional view of the middle section (BB);
[0027] Figure 6 This is a side view of the cable unlocking mechanism of this utility model when it is unlocked and folded.
[0028] Figure 7 This is a cross-sectional view of the cable unlocking mechanism of this utility model when it is unlocked and not folded.
[0029] Figure 8 This is a schematic diagram of the unlocking state of the button unlocking mechanism of this utility model;
[0030] Figure 9 This is a side view of the button unlocking mechanism of this utility model in the unlocked state;
[0031] Figure 10 This is a schematic diagram of the folding headrest with button unlocking function of this utility model;
[0032] Figure 11 This is a schematic diagram of the cable-unlocked folding headrest of this utility model.
[0033] In the diagram: 1—Headrest unlocking lever, 100—First protrusion, 2—Headrest pull rod, 3—Rotating shaft, 4—Headrest front cover, 5—Upper locking plate, 6—Lower locking plate, 7—Headrest rod, 8—Locking block, 9—Locking slot, 10—Backrest, 11—Headrest, 12—Headrest cable, 13—Cable roller, 14—Second protrusion, 15—Unlocking button, 16—Button mounting slot, 17—First return spring, 18—Locking plate support rod, 19—Second return spring, 20—Fourth return spring, 21—Pulley mounting part, 22—Mounting slot, 23—Third return spring. Detailed Implementation
[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figures 1 to 11 All accompanying drawings are simplified versions of embodiments and are intended solely for the purpose of clearly and concisely illustrating the embodiments of this utility model. The technical solutions shown in the drawings below are specific solutions of embodiments of this utility model and are not intended to limit the scope of the claimed utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0035] In the description of this utility model, it should be understood that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0036] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0037] This embodiment provides a car rear seat headrest folding mechanism, installed at the connection between the car seat backrest 10 and the headrest 11. The car seat backrest 10 includes a plastic backrest bracket and a foam component, and the headrest 11 includes a plastic headrest bracket and a foam component. An inverted U-shaped headrest rod 7 is fixedly installed on the top of the car seat backrest bracket. The headrest bracket is rotatably mounted on the crossbar of the headrest rod 7, and the headrest bracket can be folded along the backrest bracket. Figure 11 As shown, the backrest bracket is rotatably connected to the seat cushion bracket of the car seat, and the backrest bracket can be folded along the seat cushion bracket, as shown. Figure 11 As shown.
[0038] like Figures 1 to 9As shown, the folding mechanism includes a headrest unlocking rod 1, a headrest pull rod 2, a locking mechanism, a pull cord unlocking mechanism, and a button unlocking mechanism. The headrest unlocking rod 1 includes a horizontal part and a vertical part, which form a structure similar to the number 7. The part where the horizontal and vertical parts of the headrest unlocking rod 1 turn is mounted on the headrest front cover 4 through a pivot 3. One end of the headrest pull rod 2 is connected to the horizontal part of the headrest unlocking rod 1, and the other end is connected to the locking mechanism. The locking mechanism includes an upper locking plate 5 and a lower locking plate 6. The upper locking plate 5 is rotatably mounted on the end of the headrest pull rod 2. The lower locking plate 6 is fixed on the horizontal bar of the headrest rod 7 and has a locking block 8 on its upper part. The lower part of the upper locking plate 5 has a corresponding locking groove 9 that matches the locking block 8. Moving the upper locking plate 5 upwards can disengage the locking block 8 on the upper locking plate 5 from the locking groove 9, thereby unlocking the device. Therefore, the headrest lever 2 is positioned on the horizontal part of the headrest unlocking lever 1. When the horizontal part of the headrest unlocking lever 1 moves upward, the headrest lever 2 can be pulled, thereby unlocking the mechanism by pulling the headrest lever 2. Because of the pivot 3, when the vertical part is pushed from the outside, the horizontal part will move upward, and the same function can be achieved by pushing and pulling upward from the end of the horizontal part. Therefore, the structure of the headrest unlocking lever 1 can accommodate two different unlocking methods: the horizontal part of the headrest unlocking lever 1 can be pulled upward by the rope unlocking mechanism, or the vertical part of the headrest unlocking lever 1 can be pushed upward by the button unlocking mechanism.
[0039] In the embodiments, such as Figures 4 to 7 As shown, the pull-cord unlocking mechanism includes a headrest pull cable 12 and a pull-cord wheel 13 located at the lateral end of the headrest unlocking lever 1. The pull-cord wheel 13 is rotatably mounted on the headrest front cover 4. One end of the headrest pull cable 12 is fixedly wound around the pull-cord wheel 13, and the other end extends from the lower part of the headrest 11 and extends and is fixed to the seat cushion support of the car seat. To cooperate with the pull-cord unlocking mechanism, a first protrusion 100 is provided at the lateral end of the headrest unlocking lever 1, and a second protrusion 14 in the shape of an arc, fan, or semicircle is provided on the pull-cord wheel 13. During the rotation of the pull-cord wheel 13, the second protrusion 14 contacts the first protrusion 100 and provides an upward thrust to the first protrusion 100. The outer arc length of the second protrusion 14 is sufficient to meet the stretching length of the headrest pull cable 12 when the headrest 11 is folded down and the car seat back can continue to be folded down to a fully reclined state.
[0040] Since the other end of the headrest cable 2 of the pull cord unlocking mechanism is connected to the seat cushion support, the unlocking mechanism will unlock when the seat back is folded about 20° along the seat cushion support. If the upper end of the headrest cable is directly connected to the unlocking rod, the upper end of the headrest cable cannot be pulled after the headrest is unlocked and folded, and the backrest cannot be folded further. In order to ensure that the backrest can continue to fold, a compensator will be added, which is quite troublesome. This utility model sets a pull cord turntable 13 and a second protrusion 14 on the upper part. When the pull cord pulls the pull cord turntable 13 to rotate, the second protrusion 14 pushes the first protrusion 100 upward to unlock during the rotation. After unlocking, the pull cord turntable can be pulled to rotate without locking. However, the first protrusion 100 needs to be kept in the unlocked state. Therefore, the second protrusion 14 is set to be arc-shaped, semi-circular, or fan-shaped, and its length is sufficient to ensure that the second protrusion 14 is always in contact with the first protrusion 100 during subsequent pulling. Therefore, this structure is designed to allow the backrest to continue folding forward after the headrest is folded, without the need for a compensator.
[0041] In the embodiments, such as Figures 8 to 9 As shown, the unlock button 15 is installed on the outer side of the vertical part of the headrest unlock rod 1, and a button mounting groove 16 is correspondingly provided on the side of the headrest front cover 4. The unlock button 15 is slidably installed in the button mounting groove 16, and the output end of the unlock button 15 is directly facing the vertical part of the headrest unlock rod 1; the unlock button 15 is provided with a first return spring 17. The unlock button 15 includes a pressing end cap and a pressing rod. The pressing end cap is located on the side of the headrest 11, and the pressing rod extends into the plastic part of the headrest, with its end facing the vertical part of the headrest unlocking rod 1. The first return spring 17 is sleeved on the pressing rod, with one end connected to the pressing end cap and the other end fixed in the button mounting groove 16. When the unlock button 15 is pressed, the pressing rod extends out of the button mounting groove 16 and provides a downward rotating thrust to the vertical part of the headrest unlocking rod 1. Under the action of the lever principle, the vertical part of the headrest unlocking rod 1 rotates downward and the horizontal part of the headrest unlocking rod 1 rotates upward, driving the headrest pull rod 2 and the upper locking plate 5 to rotate upward, so that the locking block 8 at the lower part of the upper locking plate 5 disengages from the locking groove 9 on the lower locking plate 6, thereby unlocking it.
[0042] The embodiment provides a folding mechanism for a car rear seat headrest, such as Figures 1 to 9As shown, to ensure that the upper locking plate 5 can be unlocked by rotating upwards in its original position without shifting, a locking plate support rod 18 is fixedly installed on the headrest front cover 4 at the position corresponding to the upper locking plate 5. The upper locking plate 5 is rotatably mounted on the locking plate support rod 18. Second return springs 19 are symmetrically arranged on both sides of the lower locking plate 6. The second return springs 19 are sleeved on the crossbar of the headrest rod 7, with one end connected to the lower locking plate 6 and the other end connected to the locking plate support rod 18. To ensure that the headrest unlocking rod 1 can automatically reset when the external force is released, a third return spring 20 is installed on the headrest unlocking rod 1. The third return spring 20 is sleeved on the rotating shaft of the headrest unlocking rod 1, with one end connected to the headrest unlocking rod 1 and the other end connected to the headrest front cover 4. To ensure that the cable wheel 13 automatically resets when the backrest returns to its original position, a fourth return spring 23 is sleeved on the shaft of the cable wheel 13. One end of the fourth return spring 23 is connected to the cable wheel 13, and the other end is connected to the headrest front cover 4.
[0043] To facilitate the disassembly and assembly of the headrest unlocking lever 1 and the headrest pull lever 2, such as Figures 1 to 9 As shown, a pull rod mounting part 21 is provided at the center of the horizontal part of the headrest unlocking rod 1. The pull rod mounting part 21 is rotatably mounted on the headrest unlocking rod 1. The pull rod mounting part 21 includes an internal rotating rod and an enlarged end cap at the end of the rotating rod. The length of the internal rotating rod of the pull rod mounting part 21 matches the thickness of the headrest pull rod 2. An installation groove 22 is provided on the headrest pull rod 2, which matches the shape and size of the enlarged end cap at the outer end of the pull rod mounting part 21. The headrest pull rod 2 is sleeved with the enlarged end cap of the pull rod mounting part 21 through its installation groove 22. After the sleeve is engaged, the pull rod mounting part 21 is rotated to fix it.
[0044] In this embodiment, both the locking slot 9 and the locking block 8 are provided with a certain tilt angle, and the tilt angles of the two are matched, so they can be easily locked together. In the locked state, when the headrest frame is subjected to a forward external force, the locking block will be subjected to a backward force from the locking slot. Through the center of the rotation axis, the torque is 0, and the locking block will not disengage from the locking slot. Similarly, when the headrest frame is subjected to a backward external force, the locking block will be subjected to a forward force from the locking slot. Through the center of the rotation axis, the torque is 0, and the locking block will not disengage from the locking slot.
[0045] This utility model has two working states. The first working state is when no one is seated in the back seat. To prevent the back seat headrest from obstructing the view, it can be unlocked using the unlock button 15. Simply press the unlock button 15. Figure 8 and Figure 9As shown, the unlock button 15 provides a downward rotating force to the vertical part of the headrest unlock lever 1. Under the action of the lever principle, the vertical part of the headrest unlock lever 1 rotates downward, and the horizontal part of the headrest unlock lever 1 rotates upward, driving the headrest pull rod 2 and the upper locking plate 5 to rotate upward. This causes the locking block 8 at the lower part of the upper locking plate 5 to disengage from the locking groove 9 on the lower locking plate 6, unlocking it. The headrest 11 can then be folded forward. Figure 10 As shown.
[0046] The second working state of this utility model is when the seat backrest needs to be folded forward to expand the trunk space. When the seat backrest 10 is folded forward, the seat backrest will pull the headrest cable 12, which in turn pulls the cable turntable 13, causing the cable turntable 13 to rotate. Figures 4 to 7 As shown, when the seat back is folded approximately 20°, the second protrusion 14 on the cable turntable 13 will contact the first protrusion 100 on the headrest unlocking lever 1, providing an upward thrust to the first protrusion 100. This causes the lateral portion of the headrest unlocking lever 1 to rotate upward, which in turn causes the headrest pull rod 2 and the upper locking plate 5 to rotate upward. This disengages the locking block 8 at the lower part of the upper locking plate 5 from the locking groove 9 on the lower locking plate 6, unlocking it. The headrest 11 can then be folded forward. Figure 11 As shown.
[0047] The headrest unlocking lever 1 and the cable wheel 13 of this invention are both equipped with return springs. The return spring on the headrest unlocking lever can always press against the unlocking lever and rotate clockwise until the button is pressed to unlock or the cable is pulled to unlock. When the external force is released, the return spring can drive the headrest unlocking lever to return to its original position automatically. The return spring on the cable wheel always presses against the wheel and rotates counterclockwise. When the cable pulls the wheel, the rotation can be forward. When the tension is released, the cable wheel can return to its original position automatically.
[0048] The above description is merely one embodiment of this utility model, and while it is quite specific and detailed, it should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.
Claims
1. A car rear seat headrest folding mechanism, installed at the connection between the backrest (10) and headrest (11) of a car seat, wherein an inverted U-shaped headrest rod (7) is fixedly installed on the top of the backrest support of the car seat, the headrest support is rotatably mounted on the crossbar of the headrest rod (7), and the backrest support is rotatably connected to the seat cushion support of the car seat, characterized in that: The folding mechanism includes a headrest unlocking rod (1), a headrest pull rod (2), a locking mechanism, and a pull cord unlocking mechanism. The headrest unlocking rod (1) includes a horizontal part and a vertical part. The part where the horizontal part and the vertical part turn is mounted on the headrest front cover (4) through a pivot (3). A first protrusion (100) is provided at the end of the horizontal part. One end of the headrest pull rod (2) is connected to the horizontal part of the headrest unlocking rod (1), and the other end is connected to the locking mechanism. The locking mechanism includes an upper locking plate (5) and a lower locking plate (6). The upper locking plate (5) is rotatably mounted on the end of the headrest pull rod (2). The lower locking plate (6) is fixed on the crossbar of the headrest rod (7). A locking block (8) is provided on its upper part. A locking groove (9) matching the locking block (8) is provided on the lower part of the upper locking plate (5). The pull cord unlocking mechanism includes a headrest pull cord (12) and a pull cord wheel (13) located at the end of the transverse part of the headrest unlocking rod (1). The pull cord wheel (13) is rotatably mounted on the headrest front cover (4). One end of the headrest pull cord (12) is fixedly wound around the pull cord wheel (13), and the other end extends from the lower part of the headrest (11) and extends and is fixed to the seat cushion bracket of the car seat. The pull cord wheel (13) is provided with a second protrusion (14) that is arc-shaped, fan-shaped or semi-circular. During the rotation of the pull cord wheel (13), the second protrusion (14) contacts the first protrusion (100) and provides an upward thrust to the first protrusion (100).
2. The automobile rear seat headrest folding mechanism according to claim 1, characterized in that: The folding mechanism also includes an unlocking button (15), which is installed on the outside of the vertical part of the headrest unlocking rod (1). A button mounting groove (16) is provided on the side of the headrest front cover (4). The unlocking button (15) is slidably installed in the button mounting groove (16), and the output end of the unlocking button (15) is directly opposite the vertical part of the headrest unlocking rod (1). The unlocking button (15) is provided with a first reset spring (17).
3. A car rear seat headrest folding mechanism according to claim 1 or 2, characterized in that: A locking plate support rod (18) is fixedly installed on the headrest front cover (4) at the position corresponding to the upper locking plate (5). The upper locking plate (5) is rotatably installed on the locking plate support rod (18). A second return spring (19) is symmetrically provided on both sides of the lower locking plate (6). The second return spring (19) is sleeved on the crossbar of the headrest rod (7), with one end connected to the lower locking plate (6) and the other end connected to the locking plate support rod (18).
4. A car rear seat headrest folding mechanism according to claim 1 or 2, characterized in that: A third return spring (20) is installed on the headrest unlocking rod (1). The third return spring (20) is sleeved on the rotating shaft of the headrest unlocking rod (1), and one end is connected to the headrest unlocking rod (1), while the other end is connected to the headrest front cover (4).
5. A car rear seat headrest folding mechanism according to claim 1 or 2, characterized in that: A fourth return spring (23) is sleeved on the shaft of the cable wheel (13). One end of the fourth return spring (23) is connected to the cable wheel (13), and the other end is connected to the headrest cover (4).
6. A car rear seat headrest folding mechanism according to claim 1 or 2, characterized in that: The headrest unlocking rod (1) has a pull rod mounting part (21) at the center of its horizontal part. The pull rod mounting part (21) is rotatably mounted on the headrest unlocking rod (1). The pull rod mounting part (21) includes an internal rotating rod and an enlarged end cap at the end of the rotating rod. The length of the internal rotating rod of the pull rod mounting part (21) matches the thickness of the headrest pull rod (2). An installation groove (22) matching the shape and size of the enlarged end cap of the pull rod mounting part (21) is provided on the headrest pull rod (2). The headrest pull rod (2) is sleeved with the enlarged end cap of the pull rod mounting part (21) through its installation groove (22). After the sleeve is completed, the pull rod mounting part (21) is rotated to fix it.
7. A car rear seat headrest folding mechanism according to claim 1 or 2, characterized in that: Both the locking slot (9) and the locking block (8) have a certain tilt angle, and the tilt angles of the two are matched.
8. A car rear seat headrest folding mechanism according to claim 1 or 2, characterized in that: The outer arc length of the second protrusion (14) satisfies the stretch length of the headrest cable (12) when the headrest (11) is folded and the car seat back can continue to be folded down to a fully reclined state.
9. A car rear seat headrest folding mechanism according to claim 2, characterized in that: The unlock button (15) includes a pressing end cap and a pressing rod. The pressing end cap is located on the side of the headrest (11). The pressing rod extends into the plastic part of the headrest, and its end is directly opposite the vertical part of the headrest unlocking rod (1). The first reset spring (17) is sleeved on the pressing rod, and one end is connected to the pressing end cap, and the other end is fixed in the button mounting groove (16). When the unlock button (15) is pressed, the pressing rod extends out of the button mounting groove (16) and provides a downward rotating thrust to the vertical part of the headrest unlocking rod (1). Under the action of the lever principle, the vertical part of the headrest unlocking rod (1) rotates downward, and the horizontal part of the headrest unlocking rod (1) rotates upward, driving the headrest pull rod (2) and the upper locking plate (5) to rotate upward, so that the locking block (8) at the lower part of the upper locking plate (5) disengages from the locking slot (9) on the lower locking plate (6) and unlocks it.