Rear-end collision head and neck protection devices

Abstract

This invention provides a head and neck protection device for rear-end collisions, including a headrest seat, a first buffer assembly, and a limiting mechanism. When a rear-end collision occurs, the impacted vehicle accelerates forward, causing the head of an occupant to strike the first cushion. Upon impact, the first cushion drives a guide seat to move, compressing multiple sets of buffers. At this time, the first cushion and the multiple buffers work together to cushion the impact on the head, improving the device's buffering effect and reducing head injuries. Simultaneously, the movement of the guide seat drives the fixing assembly to release the limiting rod. The driving component then drives the limiting rod to rotate to a second state, so that the arc-shaped portion of the limiting rod faces the first cushion. When the head moves forward due to the impact reaction force, the limiting rod can contact the head, thereby limiting large-scale forward head movement, preventing neck strain, and improving the device's protective effect.

Description

Technical Field

[0001] This invention specifically relates to a head and neck protection device for rear-end collisions of vehicles. Background Technology

[0002] Currently, in rear-end collisions, the vehicle being hit will accelerate forward due to the impact. This forward acceleration will cause the heads of the occupants to move backward due to inertia, resulting in their heads hitting the headrests of the seats.

[0003] Most existing car seat headrests have a simple structure. When the head hits the headrest, they mostly rely on the soft padding on the outside of the headrest to cushion the impact. However, the cushioning effect is poor, which can easily cause head injuries. At the same time, existing car seat headrests cannot restrain the head after an impact. When the head hits the headrest, the reaction force of the impact will cause the head to move forward significantly. Since the seat belt restricts the body and prevents the body from moving forward with the head, the large forward movement of the head can easily cause neck strain, thus reducing the protective effect of the device. Therefore, in order to address the above technical problems, a vehicle rear-end collision head and neck protection device is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a head and neck protection device for rear-end collisions. This device improves the buffering effect on head impacts and limits head movement after impact, thereby reducing head injuries and preventing neck strain, thus enhancing the protective effect of the device.

[0005] Vehicle rear-end collision head and neck protection devices include:

[0006] A headrest seat, including a first end and a second end, wherein the bottom end of the headrest seat is provided with a connecting rod for connecting to a vehicle seat;

[0007] The first buffer assembly includes a guide seat and multiple sets of buffers. The first end has an installation cavity. One side of the guide seat is connected to the side wall of the installation cavity through multiple sets of buffers and can slide along the width direction of the headrest seat. The other side of the guide seat has a first soft pad that extends out of the headrest seat.

[0008] The limiting mechanism includes a limiting rod, a fixing component, and a driving component. The limiting rod is U-shaped, with both ends rotatably mounted on the headrest seat. It has a first state where the arc-shaped portion faces the second end and a second state where the arc-shaped portion faces the first soft cushion. The fixing component connects the guide seat and the limiting rod, and is used to fix the limiting rod in the first state. It is released from fixation when the guide seat slides. The driving component connects the limiting rod and the headrest seat, and is used to drive the limiting rod to rotate to the second state after the limiting rod is released from fixation.

[0009] The beneficial effects of the aforementioned vehicle rear-end collision head and neck protection devices are as follows:

[0010] When a rear-end collision occurs, the impacted vehicle accelerates forward, causing the occupants' heads to strike the first cushion. Upon impact, the first cushion drives the guide seat to move, compressing multiple sets of buffers. At this time, the first cushion and the multiple sets of buffers work together to cushion the impact on the head, improving the device's cushioning effect and reducing head injuries. Simultaneously, the movement of the guide seat drives the fixing assembly to release the limit rod. At this time, the driving component drives the limit rod to rotate to the second state, so that the arc-shaped part of the limit rod is opposite the first cushion. When the head moves forward due to the impact reaction force, the limit rod can contact the head, thereby limiting the head's forward movement and preventing neck strain, thus improving the device's protective effect.

[0011] In one embodiment, the first buffer assembly further includes two sets of limiting plates and two sets of extension plates; both ends of the mounting cavity are provided with connecting shafts, one end of each of the two sets of limiting plates is respectively sleeved on the two sets of connecting shafts, and the other end of each of the two sets of limiting plates is slidably provided with an extension plate. One end of each of the two sets of extension plates is respectively hinged to both ends of the guide seat, and the sliding of the guide seat can drive the two sets of extension plates to slide. A second soft pad is provided on each of the two sets of limiting plates corresponding to the first soft pad. By setting two sets of limiting plates and two sets of extension plates, when the head hits the first soft pad and causes the guide seat to move, the movement of the guide seat drives the two sets of limiting plates to rotate through the two sets of extension plates, and causes the two sets of extension plates to slide along the two sets of limiting plates. At this time, the guide seat, the two sets of extension plates and the two sets of limiting plates cooperate to form a cavity to limit the head and prevent the head from displacing when it hits the first soft pad, thus preventing the head from slipping off the first soft pad. In addition, a second soft pad is set. When the cavity is formed, the second soft pad and the first soft pad squeeze each other to fill the gap between the guide seat, the two sets of extension plates and the two sets of limiting plates, thereby preventing the head from hitting the extension plates or the limiting plates.

[0012] In one embodiment, each of the two sets of limiting plates has a receiving groove at one end, and each of the two sets of extension plates slides through the receiving groove. Each of the receiving grooves has a limiting groove at both its top and bottom, and each of the extension plates has a limiting block at both its top and bottom. The limiting block slides within the limiting groove. By using the limiting groove and the limiting block, the stability of the extension plate during sliding is improved, preventing it from slipping out of the limiting plate, thereby improving the stability of the cavity formed by the guide seat, the two sets of extension plates, and the two sets of limiting plates.

[0013] In one embodiment, the limiting rod is provided with a rotating shaft at both ends, and the headrest seat is provided with a fixing hole at both ends that communicates with the mounting cavity. The two sets of rotating shafts are rotatably arranged in the two sets of fixing holes.

[0014] In one embodiment, the fixing assembly includes a pressure plate, elastic elements, and a locking rod; a guide cavity is formed on the bottom surface of the mounting cavity, the pressure plate is slidably disposed in the guide cavity along the height direction of the headrest seat, and the top of the pressure plate protrudes from the guide cavity; a guide slope is provided at one end of the pressure plate, the guide seat abuts against the guide slope; multiple sets of elastic elements are spaced apart at the bottom end of the pressure plate, the bottom ends of the multiple sets of elastic elements abut against the bottom surface of the guide cavity; a through groove is formed between the mounting cavity and one set of fixing holes; the locking rod is slidably disposed in the through groove along the height direction of the headrest seat, and its bottom end is connected to the pressure plate; a locking groove is formed on the circumferential side of one set of rotating shafts, and the top of the locking rod passes through the locking groove. When the guide seat moves and presses against the guide ramp, the pressure on the guide ramp causes the pressure plate to move downward and press against the elastic element. The downward movement of the pressure plate drives the locking rod to move downward. When the locking rod moves downward and separates from the locking groove, the locking rod is no longer fixed to the rotating shaft. This makes it easier to release the fixation of the limiting rod when the head hits the first soft pad and causes the guide seat to move. This allows the driving component to drive the limiting rod to rotate so that the arc-shaped part of the limiting rod is opposite to the first soft pad. As a result, when the head moves forward due to the impact reaction force, the limiting rod can contact the head, thereby limiting the large forward movement of the head, avoiding neck strain, and improving the protective effect of the device.

[0015] In one embodiment, multiple sets of guide grooves are formed on both opposite side walls of the guide cavity, and multiple sets of guide blocks are provided on the pressure plate corresponding to the multiple sets of guide grooves. The multiple sets of guide blocks are slidably disposed within the multiple sets of guide grooves along the height direction of the headrest seat. By providing multiple sets of guide blocks in cooperation with multiple sets of guide grooves, the stability of the pressure plate during sliding can be improved.

[0016] In one embodiment, the elastic element includes a spring, the top end of which is connected to the bottom end of the pressure plate, and the bottom end of the spring abuts against the bottom surface of the guide cavity.

[0017] In one embodiment, the driving component includes a torsion spring located within the fixing hole and sleeved on another set of rotating shafts. One end of the torsion spring is connected to the rotating shaft, and the other end is connected to the headrest seat. When the locking rod moves downward and separates from the locking groove, the torque of the torsion spring drives the rotating shaft to rotate. The rotation of the rotating shaft drives the limiting rod to rotate, so that the arc-shaped part of the limiting rod faces the first soft pad, making it convenient to drive the limiting rod to rotate.

[0018] In one embodiment, a second buffer assembly is further included. The second buffer assembly includes a first airbag, a second airbag, and a connecting tube. The first airbag is disposed in the guide cavity, with its bottom end connected to the bottom surface of the guide cavity and its top end connected to the bottom end of the pressure plate. The second airbag is disposed inside the arc-shaped portion of the limiting rod. A set of rotating shafts and the limiting rod are provided with communicating air guide cavities. Multiple sets of communicating through holes are provided between the air guide cavities and the second airbag at intervals. One end of the connecting tube is connected to the air guide cavity, and the other end passes through the pressure plate and is connected to the first airbag. As the pressure plate moves downwards, aligning the arc-shaped portion of the limiting rod with the first soft pad, it simultaneously compresses the first airbag. This compression causes the gas inside the first airbag to be transported through the connecting pipe to the second airbag, inflating it. Simultaneously, the limiting rod rotates, causing the rotating shaft to rotate. This rotation misaligns the locking groove with the locking rod, causing the rotating shaft to contact the locking rod, keeping the pressure plate compressing the first airbag. When the head moves forward due to the impact reaction force and separates from the first soft pad, the pressure on the first soft pad disappears. The first soft pad and the guide seat move in opposite directions to reset, releasing the pressure on the pressure plate. At this point, the pressure plate also continues to compress the first airbag, ensuring the second airbag remains inflated. This inflation of the second airbag buffers the collision between the head moving forward and the limiting rod, preventing injury from the head colliding with the limiting rod and further improving the device's head and neck protection.

[0019] In one embodiment, a connecting head is coaxially and rotatably mounted on the rotating shaft that provides the air guide cavity. One end of the connecting head is connected to the air guide cavity, and the other end is connected to the connecting pipe. By providing the connecting head, the rotating shaft is prevented from rotating the connecting pipe, thus avoiding twisting or bending of the connecting pipe. This facilitates the entry of gas from the first airbag into the second airbag to cushion the impact between the head and the limiting rod. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1A three-dimensional structural schematic diagram of a vehicle rear-end collision head and neck protection device provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 The image shown is an exploded view of a vehicle's head and neck protection device in a rear-end collision.

[0023] Figure 3 for Figure 1 The diagram shows a top view after partial cross-section of the vehicle rear-end collision head and neck protection device in another state.

[0024] Figure 4 for Figure 1 The exploded view of the first buffer component in the vehicle rear-end collision head and neck protection device shown.

[0025] Figure 5 for Figure 1 The front view of the headrest seat with the limiting mechanism cut out from the vehicle rear-end collision head and neck protection device shown.

[0026] Figure 6 for Figure 1 The exploded view of the headrest seat and limiting mechanism in the rear-end collision head and neck protection device shown is a cross-section of the vehicle's rear-end collision head and neck protection device.

[0027] Figure 7 for Figure 6 Enlarged view of region A in the middle;

[0028] Figure 8 for Figure 1 The diagram shows a top view of a partially cut-off limit bar in a rear-end collision head and neck protection device for a vehicle.

[0029] Figure 9 for Figure 8 Enlarged schematic diagram of region B in the middle.

[0030] Figure label:

[0031] 10. Headrest seat; 101. First end; 102. Second end; 103. Connecting rod; 104. Mounting cavity; 105. Connecting shaft; 106. Fixing hole; 107. Guide cavity; 1071. Guide groove; 108. Through groove;

[0032] 20. First buffer assembly; 201. First soft pad; 202. Guide seat; 203. Buffer; 204. Limiting plate; 2041. Limiting groove; 205. Extension plate; 2051. Limiting block; 206. Second soft pad;

[0033] 30. Limiting mechanism; 301. Guide slope; 302. Pressure plate; 3021. Guide block; 303. Spring; 304. Locking rod; 305. Limiting rod; 3051. Torsion spring; 306. Rotating shaft; 3061. Locking groove; 3062. Connecting head; 307. Air guide chamber; 3071. Through hole;

[0034] 40. First airbag; 401. Second airbag; 402. Connecting tube. Detailed Implementation

[0035] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0036] Please see Figures 1 to 4 One embodiment of the vehicle rear-end collision head and neck protection device includes a headrest seat 10, a first buffer assembly 20 and a limiting mechanism 30.

[0037] The headrest seat 10 includes a first end 101 and a second end 102, and a connecting rod 103 for connecting to the vehicle seat is provided at the bottom of the headrest seat 10. The first buffer assembly 20 includes a guide seat 202 and multiple sets of buffers 203. The first end 101 has a mounting cavity 104. One side of the guide seat 202 is connected to the side wall of the mounting cavity 104 through multiple sets of buffers 203 and can slide along the width direction of the headrest seat 10. The other side of the guide seat 202 has a first soft pad 201 extending out of the headrest seat 10.

[0038] In the above embodiment, when a rear-end collision occurs, the vehicle accelerates forward, causing the head of the person inside the vehicle to hit the first soft pad 201. After the first soft pad 201 is hit, it drives the guide seat 202 to move. The movement of the guide seat 202 can compress multiple sets of buffers 203. At this time, the first soft pad 201 and multiple sets of buffers 203 work together to buffer the impact on the head, improve the buffering effect of the device, and reduce head impact injuries.

[0039] Please see Figures 3 to 4 In one embodiment, the first buffer assembly 20 further includes two sets of limiting plates 204 and two sets of extension plates 205; both ends of the mounting cavity 104 are provided with connecting shafts 105, one end of each of the two sets of limiting plates 204 is respectively sleeved on the two sets of connecting shafts 105, and the other end of each of the two sets of limiting plates 204 is slidably provided with an extension plate 205. One end of each of the two sets of extension plates 205 is hinged to both ends of the guide seat 202. The sliding of the guide seat 202 can drive the two sets of extension plates 205 to slide. A second soft pad 206 is provided on each of the two sets of limiting plates 204 corresponding to the first soft pad 201.

[0040] In the above embodiment, when the head impacts the first soft pad 201, causing the guide seat 202 to move, the movement of the guide seat 202 drives the two sets of limiting plates 204 to rotate via the two sets of extension plates 205, and causes the two sets of extension plates 205 to slide along the two sets of limiting plates 204. At this time, the guide seat 202, the two sets of extension plates 205, and the two sets of limiting plates 204 cooperate to form a cavity to limit the head, preventing displacement when the head impacts the first soft pad 201 and thus preventing the head from slipping off the first soft pad 201. At the same time, by providing a second soft pad 206, when the guide seat 202, the two sets of extension plates 205, and the two sets of limiting plates 204 cooperate to form a cavity, the second soft pad 206 and the first soft pad 201 press against each other to fill the gap between the guide seat 202, the two sets of extension plates 205, and the two sets of limiting plates 204, thereby preventing the head from impacting the extension plates 205 or the limiting plates 204 and improving the protection effect for the head.

[0041] Based on the above embodiment, further, each of the two sets of limiting plates 204 has a receiving groove at one end, and one end of each of the two sets of extension plates 205 is slidably inserted into the two sets of receiving grooves. Each of the top and bottom ends of the two sets of receiving grooves has a limiting groove 2041, and each of the top and bottom ends of the two sets of extension plates 205 is provided with a limiting block 2051, which is slidably disposed within the limiting groove 2041. By providing the limiting groove 2041 and the limiting block 2051 in cooperation, the stability of the extension plate 205 during sliding can be improved, preventing the extension plate 205 from slipping out of the limiting plate 204, thereby improving the stability of the cavity formed by the guide seat 202, the two sets of extension plates 205, and the two sets of limiting plates 204.

[0042] Please see Figure 2 , Figures 5 to 7 In one embodiment, the limiting mechanism 30 includes a limiting rod 305, a fixing component, and a driving component. The limiting rod 305 is U-shaped, and its two ends are rotatably mounted on the headrest seat 10. It has a first state in which the arcuate portion is opposite to the second end 102 and a second state in which the arcuate portion is opposite to the first soft pad 201. The fixing component connects the guide seat 202 and the limiting rod 305, and is used to fix the limiting rod 305 in the first state. It is released from fixation when the guide seat 202 slides. The driving component connects the limiting rod 305 and the headrest seat 10, and is used to drive the limiting rod 305 to rotate to the second state after the limiting rod 305 is released from fixation.

[0043] Specifically, the limiting rod 305 has a rotating shaft 306 at both ends, and the headrest seat 10 has a fixing hole 106 at both ends that communicates with the mounting cavity 104. The two sets of rotating shafts 306 are rotatably arranged in the two sets of fixing holes 106. The fixing assembly includes a pressure plate 302, elastic elements, and a locking rod 304. The bottom surface of the mounting cavity 104 has a guide cavity 107. The pressure plate 302 is slidably arranged in the guide cavity 107 along the height direction of the headrest seat 10, and the top of the pressure plate 302 protrudes from the guide cavity 107. One end of the pressure plate 302 is provided with a guide slope 301, and the guide seat 202 abuts against the guide slope 301. Multiple sets of elastic elements are spaced apart at the bottom end of the pressure plate 302, and the bottom ends of the multiple sets of elastic elements abut against the bottom surface of the guide cavity 107. The elastic element includes a spring 303, the top end of the spring 303 is connected to the bottom end of the pressure plate 302, and the bottom end of the spring 303 abuts against the bottom surface of the guide cavity 107. A through groove 108 is provided between the mounting cavity 104 and one of the sets of fixing holes 106. The locking rod 304 is slidably disposed in the through groove 108 along the height direction of the headrest seat 10, and its bottom end is connected to the pressure plate 302. A locking groove 3061 is provided on the circumference of one set of rotating shafts 306, and the top end of the locking rod 304 passes through the locking groove 3061. The driving component includes a torsion spring 3051, which is located in the fixing hole 106 and sleeved on another set of rotating shafts 306. One end of the torsion spring 3051 is connected to the rotating shaft 306, and the other end is connected to the headrest seat 10.

[0044] In the above embodiment, when the head impacts the first soft pad 201 and causes the guide seat 202 to move, the guide seat 202 moves and presses the guide ramp 301. The guide ramp 301 is pressed, causing the pressure plate 302 to move downward and press the spring 303, which in turn drives the locking rod 304 to move downward. The downward movement of the locking rod 304 causes the locking rod 304 to separate from the locking groove 3061. At this time, the locking rod 304 is no longer fixed to the rotating shaft 306, and the reaction force of the torsion spring 3051 can drive the limiting rod 305 to rotate, so that the arc-shaped part of the limiting rod 305 is opposite to the first soft pad 201. Therefore, when the reaction force after the head impacts the first soft pad 201 causes the head to move forward, the limiting rod 305 can contact the head, thereby limiting the head from moving forward too much, avoiding neck strain, and improving the protective effect of the device.

[0045] Based on the above embodiment, multiple sets of guide grooves 1071 are formed on both opposite side walls of the guide cavity 107. The pressure plate 302 is provided with multiple sets of guide blocks 3021 corresponding to the multiple sets of guide grooves 1071. These guide blocks 3021 are slidably disposed within the multiple sets of guide grooves 1071 along the height direction of the headrest seat 10. By providing multiple sets of guide blocks 3021 in cooperation with the multiple sets of guide grooves 1071, the stability of the pressure plate 302 during sliding can be improved.

[0046] Please see Figure 6 , Figure 8 , Figure 9In one embodiment, a second buffer assembly is also included. The second buffer assembly includes a first airbag 40, a second airbag 401, and a connecting pipe 402. The first airbag 40 is disposed in the guide cavity 107, with its bottom end connected to the bottom surface of the guide cavity 107 and its top end connected to the bottom end of the pressure plate 302. The second airbag 401 is disposed inside the arc-shaped portion of the limiting rod 305. A set of rotating shafts 306 and the limiting rod 305 are provided with communicating air guide cavities 307. Multiple sets of communicating through holes 3071 are provided between the air guide cavities 307 and the second airbag 401 at intervals. One end of the connecting pipe 402 is connected to the air guide cavity 307, and the other end passes through the pressure plate 302 and is connected to the first airbag 40.

[0047] In the above embodiment, as the pressure plate 302 moves downward to align the arc-shaped portion of the limiting rod 305 with the first soft pad 201, the pressure plate 302 also moves downward to compress the first airbag 40. The compressed first airbag 40 then transmits the gas inside through the connecting pipe 402 to the second airbag 401, causing the second airbag 401 to inflate. Simultaneously, the limiting rod 305 rotates, causing the rotating shaft 306 to rotate. This rotation of the rotating shaft 306 causes the locking groove 3061 to misalign with the locking rod 304. At this time, the circumference of the rotating shaft 306 abuts against the locking rod 304, keeping the pressure plate 302 compressing the first airbag 40. In the state where the head moves forward due to the impact reaction force and separates from the first soft pad 201, the pressure on the first soft pad 201 disappears, and the first soft pad 201 and the guide seat 202 move in opposite directions to reset and cancel the compression of the pressure plate 302. At this time, the pressure plate 302 also maintains the state of compressing the first airbag 40, thereby keeping the second airbag 401 in an inflated state. At this time, the inflated second airbag 401 can buffer the collision between the head moving forward and the limiting rod 305, thereby avoiding injury caused by the head colliding with the limiting rod 305, and further improving the protection effect of the device on the head and neck.

[0048] Based on the above embodiments, a connecting head 3062 is further provided coaxially and rotatably on the rotating shaft 306, which has an air guiding cavity 307. One end of the connecting head 3062 is connected to the air guiding cavity 307, and the other end is connected to the connecting pipe 402. When the rotating shaft 306 rotates, it can prevent the rotating shaft 306 from driving the connecting pipe 402 to rotate, thereby avoiding the phenomenon of twisting and bending of the connecting pipe 402, and facilitating the entry of gas in the first airbag 40 into the second airbag 401 to buffer the collision between the head and the limiting rod 305.

[0049] The specific implementation method of the aforementioned vehicle rear-end collision head and neck protection device is as follows:

[0050] When a rear-end collision occurs, the impacted vehicle accelerates forward, causing the head of an occupant to strike the first soft pad 201. Upon impact, the first soft pad 201 drives the guide seat 202 to move. The movement of the guide seat 202, through two sets of extension plates 205, causes two sets of limiting plates 204 to rotate and slide along the two sets of limiting plates 204. At this time, the guide seat 202, the two sets of extension plates 205, and the two sets of limiting plates 204 cooperate to form a cavity to limit the head, preventing displacement when the head strikes the first soft pad 201 and thus preventing the head from slipping off the first soft pad 201. Furthermore, the second soft pad 206 can prevent the head from striking the extension plates 205 or the limiting plates 204, thereby improving the head protection effect. The movement of the guide seat 202 can compress multiple sets of buffers 203. At this time, the first soft pad 201 and the multiple sets of buffers 203 work together to buffer the impact on the head, improving the buffering effect of the device and reducing head injuries.

[0051] Simultaneously, the guide seat 202 moves and presses the guide ramp 301. The pressure on the guide ramp 301 causes the pressure plate 302 to move downward, pressing the spring 303 and the first airbag 40, and also causing the locking rod 304 to move downward. The downward movement of the locking rod 304 separates the locking rod 304 from the locking groove 3061. At this time, the locking rod 304 is no longer fixed to the rotating shaft 306, and the reaction force of the torsion spring 3051 can drive the limiting rod 305 to rotate, so that the arc-shaped part of the limiting rod 305 is opposite to the first soft pad 201. After the first airbag 40 is compressed, the gas in the first airbag 40 is transported to the second airbag 401 through the connecting pipe 402, causing the second airbag 401 to inflate. The rotation of the limiting rod 305 causes the rotating shaft 306 to rotate, and the rotation of the rotating shaft 306 causes the locking groove 3061 to be misaligned with the locking rod 304. At this time, the circumference of the rotating shaft 306 abuts against the locking rod 304. 4. The pressure plate 302 is kept in a state of squeezing the first airbag 40. That is, when the head moves forward due to the impact reaction force and separates from the first soft pad 201, the pressure on the first soft pad 201 disappears, and the first soft pad 201 and the guide seat 202 move in opposite directions to reset and cancel the squeezing of the pressure plate 302. At this time, the pressure plate 302 also keeps squeezing the first airbag 40, thereby keeping the second airbag 401 in an inflated state. Therefore, when the head moves forward due to the reaction force after hitting the first soft pad 201, the first airbag 40 can come into contact with the head, thereby limiting the head to move forward in large ways, avoiding neck strain, and improving the protective effect of the device. In addition, the first airbag 40 can buffer the collision between the head moving forward and the limiting rod 305, thereby avoiding the head from colliding with the limiting rod 305 and causing injury, further improving the protective effect of the device on the head and neck.

[0052] During reset, the limiting rod 305 is rotated in the reverse direction so that the arc-shaped part of the limiting rod 305 is opposite to the second end 102. The reverse rotation of the limiting rod 305 drives the rotating shaft 306 to rotate in the reverse direction. At this time, the torsion spring 3051 is torsion, and the locking groove 3061 corresponds to the locking rod 304. When the locking groove 3061 corresponds to the locking rod 304, the reaction force of the spring 303 drives the pressure plate 302 to move upward. The upward movement of the pressure plate 302 can drive the locking rod 304 to pass through the locking groove 3061 to fix the rotating shaft 306, thereby fixing the limiting rod 305. The limiting rod 305 can be reset simply by rotating it in the reverse direction. The reset of the limiting rod 305 is convenient and facilitates the reuse of the device.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A head and neck protection device for rear-end collisions of vehicles, characterized in that, include: The headrest seat (10) includes a first end (101) and a second end (102), and the bottom end of the headrest seat (10) is provided with a connecting rod (103) for connecting to the vehicle seat. The first buffer assembly (20) includes a guide seat (202) and multiple sets of buffers (203). The first end (101) has an installation cavity (104). One side of the guide seat (202) is connected to the side wall of the installation cavity (104) through multiple sets of buffers (203) and can slide along the width direction of the headrest seat (10). The other side of the guide seat (202) is provided with a first soft pad (201) extending out of the headrest seat (10). The limiting mechanism (30) includes a limiting rod (305), a fixing component, and a driving component. The limiting rod (305) is U-shaped, and both ends of the limiting rod (305) are rotatably mounted on the headrest seat (10). It has a first state in which the arc-shaped part is opposite to the second end (102) and a second state in which the arc-shaped part is opposite to the first soft pad (201). The fixing component connects the guide seat (202) and the limiting rod (305) to fix the first state of the limiting rod (305) and releases the fixation when the guide seat (202) slides. The driving component connects the limiting rod (305) and the headrest seat (10) to drive the limiting rod (305) to rotate to the second state after the limiting rod (305) is released from fixation. The limiting rod (305) is provided with a rotating shaft (306) at both ends, and the headrest seat (10) is provided with a fixing hole (106) at both ends that communicates with the mounting cavity (104). The two sets of rotating shafts (306) are rotatably arranged in the two sets of fixing holes (106). The fixing assembly includes a pressure plate (302), an elastic element, and a locking rod (304); a guide cavity (107) is provided on the bottom surface of the mounting cavity (104), the pressure plate (302) is slidably disposed in the guide cavity (107) along the height direction of the headrest seat (10), and the top of the pressure plate (302) protrudes from the guide cavity (107), a guide slope (301) is provided at one end of the pressure plate (302), the guide seat (202) abuts against the guide slope (301), and the bottom end of the pressure plate (302) is spaced apart. Multiple sets of elastic elements, the bottom ends of the multiple sets of elastic elements abut against the bottom surface of the guide cavity (107), a through groove (108) is provided between the mounting cavity (104) and one set of the fixing holes (106), the locking rod (304) is slidably disposed in the through groove (108) along the height direction of the headrest seat (10), and the bottom end is connected to the pressure plate (302), a locking groove (3061) is provided on the circumference of one set of the rotating shafts (306), and the top end of the locking rod (304) passes through the locking groove (3061); It also includes a second buffer assembly, which includes a first airbag (40), a second airbag (401), and a connecting tube (402). The first airbag (40) is disposed in the guide cavity (107), with its bottom end connected to the bottom surface of the guide cavity (107) and its top end connected to the bottom end of the pressure plate (302). The second airbag (401) is disposed inside the arc-shaped portion of the limiting rod (305). A set of rotating shafts (306) and the limiting rod (305) are provided with communicating air guide cavities (307). Multiple sets of communicating through holes (3071) are provided between the air guide cavity (307) and the second airbag (401). One end of the connecting tube (402) is connected to the air guide cavity (307), and the other end passes through the pressure plate (302) and is connected to the first airbag (40).

2. The vehicle rear-end collision head and neck protection device according to claim 1, characterized in that, The first buffer assembly (20) further includes two sets of limiting plates (204) and two sets of extension plates (205); both ends of the mounting cavity (104) are provided with connecting shafts (105), one end of the two sets of limiting plates (204) is respectively sleeved on the two sets of connecting shafts (105), and the other end of the two sets of limiting plates (204) is slidably provided with the extension plates (205). One end of the two sets of extension plates (205) is respectively hinged to both ends of the guide seat (202). The sliding of the guide seat (202) can drive the two sets of extension plates (205) to slide. The two sets of limiting plates (204) are each provided with a second soft pad (206) corresponding to the first soft pad (201).

3. The vehicle rear-end collision head and neck protection device according to claim 2, characterized in that, Each of the two sets of limiting plates (204) has a storage groove at one end, and each of the two sets of extension plates (205) slides through the storage grooves. Each of the two sets of storage grooves has a limiting groove (2041) at the top and bottom. Each of the two sets of extension plates (205) has a limiting block (2051) at the top and bottom. The limiting block (2051) slides in the limiting groove (2041).

4. The vehicle rear-end collision head and neck protection device according to claim 1, characterized in that, Multiple sets of guide grooves (1071) are provided on the opposite side walls of the guide cavity (107). The pressure plate (302) is provided with multiple sets of guide blocks (3021) corresponding to the multiple sets of guide grooves (1071). The multiple sets of guide blocks (3021) are slidably arranged in the multiple sets of guide grooves (1071) along the height direction of the headrest seat (10).

5. The vehicle rear-end collision head and neck protection device according to claim 1, characterized in that, The elastic element includes a spring (303), the top end of which is connected to the bottom end of the pressure plate (302), and the bottom end of which abuts against the bottom surface of the guide cavity (107).

6. The vehicle rear-end collision head and neck protection device according to claim 1, characterized in that, The driving component includes a torsion spring (3051), which is located in the fixing hole (106) and sleeved on another set of the rotating shafts (306). One end of the torsion spring (3051) is connected to the rotating shaft (306), and the other end is connected to the headrest seat (10).

7. The vehicle rear-end collision head and neck protection device according to claim 1, characterized in that, A connecting head (3062) is coaxially and rotatably provided on the rotating shaft (306) that has the air guide cavity (307). One end of the connecting head (3062) is connected to the air guide cavity (307), and the other end is connected to the connecting pipe (402).

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