JP2007320506A - Seat for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat for a vehicle capable of covering shortage of relaxation of impact on a neck part due to limitation of backward movement of a seated person. <P>SOLUTION: This seat of the vehicle is constituted to support a head part of the seated person by moving a headrest forward through an active headrest mechanism by backward movement of a back collision sensor 27 by mounting the headrest 6 on a seat back frame 3 free to move back and forth by the active headrest mechanism A and providing the back collision sensor 27 to detect backward movement of the seated person on the seat back frame 3, and at least an upper part connecting frame 40 provided with the active headrest mechanism A is formed of a cylindrical member on the seat back frame 3 and a space part K surrounded by the upper part connecting frame 40 and left and right side part frames 31 is formed on an upper part of the seat back frame 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat provided with a headrest that moves forward to support a head during a so-called “rear impact” in which a seated person moves backward due to inertia in response to a collision from the rear.

Conventionally, the headrest is attached to the back frame by an active headrest mechanism so as to be movable back and forth, and the back frame is provided with a rear collision detector for detecting a rearward movement near the waist of the seated person at the time of the rear collision. And the active headrest mechanism are connected via a link mechanism, and the headrest is moved forward by the rearward movement of the rear collision detector to support the head of the seated person. The structure which connected the upper part of the part frame 31 with the plate-shaped upper frame is well-known (patent document 1).
JP 2006-117129 A

In the known example, at the time of a rear collision, the rear collision detector moves backward, and the headrest is moved forward in conjunction with the rear movement of the rear collision detector to support the seated person's head. There is a problem that backward movement in the vicinity (near the scapula) is restricted by the dorsal fin seat.
In other words, as an anti-cervical impact mitigation measure, it is effective to actively support the head by moving the headrest forward during a rear impact by the active headrest mechanism. It is also important to mitigate the impact.
In the present application, the configuration of the dorsal fin frame is devised so that the impact of the backward movement due to the inertia of the seated person is effectively reduced while actively supporting the head by the active headrest mechanism.

In the present invention, the headrest 6 is attached to the back frame 3 by the active headrest mechanism A so as to be movable back and forth, and the back collision detector 27 detects the backward movement in the vicinity of the waist of the seated person at the time of the rear collision. The rear collision detector 27 and the active headrest mechanism A are connected via the link mechanism L, and the headrest 6 is moved forward by the rear movement of the rear collision detector 27 to support the head of the seated person. The dorsal frame 3 is formed by forming at least an upper connecting frame 40 provided with the active headrest mechanism A by a cylindrical member, so that the upper connecting frame 40 and the left and right side portions are formed on the upper part of the dorsal frame 3. This is a vehicle seat in which a space K surrounded by the frame 31 is formed.
According to the present invention, the upper connecting frame 40 is formed in a downward "U" shape by a horizontal flange portion 42 and a vertical flange portion 43 formed by a cylindrical member, and the active headrest mechanism A is an upward "U" -shaped upper connection frame 40. The vehicle seat is positioned in the space K surrounded by the horizontal reed part 42 and the vertical reed part 43.
The present invention is a vehicle seat in which the lower portions of the vertical flange portions 43 on both the left and right sides of the upper connecting frame 40 are overlapped with the upper portions of the side frames 31 of the dorsal frame 3 and the overlapped portions are welded and fixed. .
In the present invention, the active headrest mechanism A includes a headrest mounting rod 10 in a horizontal direction to which a pillar support member 9 that supports the pillar 8 is mounted, and an upper link that moves the headrest mounting rod 10 forward with respect to the back seat 2. 11, and the upper link 11 is operated by the bracket portion bracket portion 12 formed by the upper plate 13, the rear plate 14, and the lower plate 15 in a “U-shaped” cross section. The link portion 16 is integrally formed with the transmission member 20 that transmits the transmission. The link portion 16 is attached to the vertical flange portion 43 by the shaft 17, and the upper plate 13, the rear plate 14, and the lower plate 15. This is a vehicle seat in which the end portion of the headrest mounting rod 10 formed of a cylindrical member is fitted and fixed in the space of the bracket portion 12 surrounded by.
In the present invention, a single-plate-like plate-like support member 50 capable of supporting a back part of a seated person separate from the rear impact sensor 27 is provided in a hollow square frame of the dorsal fin frame 3. It is attached to the dorsal frame 3 via a spring 52 so as to be movable back and forth, the rear support sensor 27 is provided behind the plate-like support member 50, and the upper edge 53 of the plate-like support member 50 is at least In order to form a space K as large as possible between the upper edge 53 of the plate-like support member 50 and the upper connecting frame 40, positioned above the vicinity of the ninth thoracic vertebra X of the average seated person T. The vehicle seat is configured.

In the first aspect of the present invention, the active headrest mechanism A is used to support the seated person's head, and the open space K surrounded by the upper connecting frame 40 and the left and right side frames 31 is used to enter the seated person. ”Is positively allowed, and the impact of the rear impact is mitigated by the space K, so that the neck impact mitigation measures can be effectively applied.
In the invention of claim 2, the plate-like member at the upper part of the dorsal frame 3 is omitted, and the "entrance of the seated person" can be improved by the space K.
According to the third aspect of the present invention, it is possible to improve the “entrance of the seated person” by the space K while ensuring the rigidity of the dorsal frame 3.
According to the fourth aspect of the present invention, the active headrest mechanism A can be made simple and the space K can be widened, and “entrance of the seated person” by the space K can be improved.
In the invention of claim 5, the support structure of the cushion material 4 can be rationalized, the space K can be widened, and “entrance of the seated person” by the space K can be further improved.

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a vehicle seat, 2 denotes a back seat of the vehicle seat 1, and the back seat 2 attaches a cushion material 4 to a back frame 3, and the cushion material 4 The outer circumference is surrounded by a skin member 5.
A headrest 6 is provided on the upper portion of the dorsal seat 2. The configuration of the headrest 6 is arbitrary, and the headrest 6 is configured by providing at least a head support portion 7 for supporting the head of the seated person and a pillar 8 for mounting on the dorsal seat 2.
The pillar 8 of the headrest 6 is an active headrest mechanism A that positively supports the head by moving the headrest 6 forward relative to the dorsal seat 2 when the seated person moves backward due to inertia by receiving an impact from the rear. It attaches to the back sheet | seat 2 via this.
The active headrest mechanism A includes a headrest mounting rod 10 in the horizontal direction to which a pillar support member 9 that supports the pillar 8 is mounted, and an upper side that moves the headrest mounting rod 10 forward with respect to the backframe frame 3 of the backrest seat 2. A link 11 is used.

The pillar support member 9 fixes the pillar 8 at a desired height so that the height of the headrest 6 can be adjusted. Although the structure of the pillar 8 and the pillar support member 9 is well-known and illustration is abbreviate | omitted, the engagement member provided in the pillar support member 9 should just be engaged with the engagement recessed part formed in the pillar 8, and may be hold | maintained.
A bracket portion 12 at one end of the upper link 11 is fixed to the left and right sides of the headrest mounting rod 10. The bracket portion 12 is formed by the upper plate 13, the rear plate 14, and the lower plate 15 in a “U” shape in cross section. In the space surrounded by the upper plate 13, the rear plate 14 and the lower plate 15 of the bracket portion 12, the end portion of the headrest mounting rod 10 formed in a pipe shape is fitted and fixed. In the upper link 11, a link portion 16 is formed integrally with the bracket portion 12, and the link portion 16 is attached to the back frame 3 by a shaft 17.
The other end of the upper link 11 is connected to the upper portion of a transmission member (rod) 20 for transmitting and inputting energy for operating the active headrest mechanism A by a shaft 21.
The lower part of the transmission member 20 is connected to the lower link 25 by a shaft 26.

Therefore, the rear collision detector 27 for detecting the backward movement of the seated person collided from behind is attached to the lower link 25. The rear collision detector 27 is attached to the lower link 25 by shafts 28 on both sides thereof. When the seat occupant moves rearward, the rear collision detector 27 transmits this energy to the upper link 11 via the lower link 25 and the transmission member 20, and the upper link 11 thereby moves the headrest 6 forward, thereby Support the head.
The lower link 25 is formed of a vertical plate member, and an intermediate mounting plate portion 30 between one end and the other end of the lower link 25 is brought into contact with an intermediate projecting portion 32 between the front and rear sides of the left and right side frames 31 of the back frame 3. The shaft 33 is attached in contact. The lower link 25 on the front side of the mounting plate portion 30 is formed on the arm portion 35. The arm portion 35 is formed by being once bent inward with respect to the mounting plate portion 30 so as to have a predetermined gap with respect to the inner surface of the side frame 31. The transmission member 20 and the rear collision detector 27 are attached to the arm portion 35.

The other end of the lower link 25 protrudes rearward from the shaft 33 and is formed on the restriction plate portion 37.
The restricting plate portion 37 comes into contact with the inner surface of the side frame 31 when the arm portion 35 of the lower link 25 is pulled by the rear collision detector 27 after operating the active headrest mechanism A. The bending of the arm part 35 is suppressed.
That is, when the rear collision detector 27 moves rearward, the arm portion 35 of the lower link 25 is rotated, and the lower link 25 operates the active headrest mechanism A to support the head by the headrest 6, and the active headrest mechanism When the rear collision detector 27 further moves rearward after the operation of A, the arm portion 35 of the lower link 25 that has already been rotated is pulled inward in the intersecting direction with respect to the rotation direction.

When the arm portion 35 of the lower link 25 is pulled inward, the lower link 25 is deformed. In the present application, the restricting plate portion 37 of the lower link 25 opposite to the arm portion 35 is formed on the inner surface of the side frame 31. Since it contacts and supports, the bending of the lower link 25 and the arm part 35 is suppressed.
That is, the arm portion 35 of the lower link 25 is not deformed during the “rotation” for operating the active headrest mechanism A, but a larger force than the active headrest mechanism A is applied to the rear collision detector 27. In this case, it is assumed that the lower link 25 is deformed, and the deformation of the lower link 25 is prevented by the restriction plate portion 37 of the lower link 25 being in contact with and supporting the inner surface of the side frame 31.
In this case, the restricting plate portion 37 is formed with a bulging portion 38 protruding toward the side frame 31 side.

The lower link 25 may be configured such that the restricting plate portion 37 contacts the inner surface of the side frame 31 by the reaction force with the shaft 33 as a fulcrum with respect to the arm portion 35, If the bulging portion 38 is in contact with and supported by the inner surface of the side frame 31, the rotational resistance of the lower link 25 can be reduced, which is preferable.
That is, when a part of the restriction plate portion 37 of the lower link 25 comes into contact with the inner surface of the side frame 31, the deformation of the lower link 25 can be prevented. Is configured so that the rotation resistance is reduced to improve the operability, and the lower link 25 (side frame 31) is prevented from being bent.

Accordingly, when a predetermined gap S is provided between the restriction plate portion 37 or the bulging portion 38 of the lower link 25 and the inner surface of the side frame 31, the lower link 25 for operating the active headrest mechanism A is provided. Rotation resistance is reduced to improve operability.
That is, the active headrest mechanism A can be operated even if the clearance S between the restricting plate portion 37 or the bulging portion 38 of the lower link 25 and the inner surface of the side frame 31 is “zero”. If the restricting plate portion 37 or the bulging portion 38 of the link 25 is always brought into contact with the inner surface of the side frame 31, resistance is given to the rotation of the lower link 25, so that the clearance S is not activated until the active headrest mechanism A is operated. Thus, the rotational resistance of the lower link 25 is reduced to improve the operability of the lower link 25, and the lower link 25 (and the side frame 31) is prevented from being bent.

Therefore, by providing a predetermined gap S between the restricting plate portion 37 or the bulging portion 38 of the lower link 25 and the inner surface of the side frame 31, the rotational resistance of the lower link 25 can be reduced and different. The generation of sound can be expected to be prevented, and variations in the manufacturing and assembly of the lower link 25 can be absorbed by the gap S, and the operation of the active headrest mechanism A can be further ensured.
Thus, the dorsal frame 3 is formed in a square frame shape by connecting the upper parts of the left and right side frames 31 by the upper connecting frame 40 and connecting the lower parts of the side frames 31 by the lower connecting frame 41. .
The upper connection frame 40 is formed by a pipe member. The upper connecting frame 40 is formed in a downward “U” shape by integrally forming a vertical flange 43 on the left and right sides of the horizontal flange 42. The vertical hook part 43 is formed to have a predetermined length, and the link part 16 of the upper link 11 is attached to the vertical hook part 43 by the shaft 17.

In the embodiment, the shaft 17 is formed by the large diameter portion 17A and the small diameter portion 17B, the large diameter portion 17A is welded and fixed to the front surface of the vertical flange portion 43, and the link portion 16 of the upper link 11 is attached to the small diameter portion 17B. Although it is attached, this attachment configuration is arbitrary.
The upper connecting frame 40 overlaps the lower part of the vertical flange part 43 with the upper part of the side frame 31 and welds and fixes the overlapped part. Therefore, for convenience of explanation, the vertical flange 43 is described as the upper connection frame 40, but when viewed from the entire dorsal frame 3, the vertical flange 43 can be said to be a constituent member constituting a part of the side frame 31. What is important is that the left and right side frames 31 are connected by the upper connecting frame 40 of a cylindrical member.

The side frame 31 forms side plate portions 45 on the front and rear sides of the intermediate projecting portion 32 of the left and right side frames 31, and each of the front and rear side plate portions 45, the arm portion 35 of the lower link 25, and the restriction plate portion 37. There is a gap between them.
Reference numeral 46 denotes a flange portion provided before and after the side plate portion 45.
Therefore, a plate-like support member 50 is provided on the dorsal frame 3. The plate-like support member 50 supports the upper body of the seated person (upper body including the waist). The plate-like support member 50 supports the upper body of the seated person with a “surface”, stabilizes the sitting posture, and makes the headrest 6 support well.
In other words, in the conventional zigzag spring configuration that is arranged side by side, the upper body of the seated person is supported by “lines” by each zigzag spring that moves backward due to a load, so the seating posture is not stable and moves forward in the case of a rear collision. Even if the headrest 6 supports the head, the upper body of the seated person moves backward, and the positional relationship between the head and the upper body becomes unstable. Since the entire upper body of the seated person can be supported by the “surface” and the headrest 6 moving forward supports the head, the plate-like support member 50 supports the upper body of the seated person by the “surface”. The seating posture of the seated person including the head is extremely stabilized.

The plate-like support member 50 is formed of a substantially rectangular single plate-like plate body 51, and the plate body 51 is seated while having a predetermined strength capable of supporting a seated person by a synthetic resin such as polypropylene. If the load is supported while being elastically deformed to some extent when it receives a rear load (including the case of weight) from a person, it is preferable because the feeling at the time of back contact called “contact” can be made flexible.
The plate-like support member 50 is configured by attaching the plate body 51 to the dorsal frame 3 via a wire spring 52 such as a zigzag spring or a formed wire spring so that the plate-like support member 50 can move back and forth. Support the seated person back and forth while holding.
In this case, the wire spring 52 has a predetermined elasticity, and is configured such that when a load is applied to the plate body 51, the entire plate body 51 can move backward while maintaining the surface shape.
Further, the rear collision detector 27 is positioned behind the plate body 51.

That is, by providing the plate-like support member 50 on the dorsal frame 3, the rear-end collision can be detected if the rear-end collision detector 27 is provided behind any part of the plate-like support member 50 from the upper end to the lower end. The middle part of the plate-like support member 50 has a large rearward movement amount, and when the rear impact occurs, the rear impact detector 27 can be moved greatly to detect the rear impact reliably. If it is provided on the upper side, the plate-like support member 50 at that portion is moved backward by a predetermined amount, so that the upper body of the seated person is insufficiently supported. The collision detector 27 is positioned.
Therefore, both the support of the seated person by the plate-like support member 50 and the certainty of the detection of the rear collision by the rear collision detector 27 can be achieved.

Therefore, it is sufficient that the upper edge 53 of the plate body 51 is positioned at least above the vicinity of the ninth thoracic vertebra X of the average seated person T, and between the upper edge 53 and the recumbent part 42 of the upper connection frame 40. A space K that is as wide as possible is formed.
The vicinity of the ninth thoracic vertebra is the position of the center of gravity of the upper body and is a portion that does not change in the spinal column in the sitting posture (the amount of movement is small). If the space portion K between the upper edge 53 and the recumbent portion 42 of the upper connecting frame 40 is widened, the upper body (thoracic vertebrae) The space part K absorbs the rearward movement of the vicinity) to mitigate the impact.

That is, as a countermeasure for mitigating neck impact that can be placed at the time of a rear impact, it is effective to actively support the head by moving the headrest 6 forward at the time of the rear impact by the active headrest mechanism A. Actively allowing backward movement due to the inertia of the upper body of the occupant T, which is said to be “entrance”, and by releasing the impact when moving backward through the space K, the effect of mitigating neck shock is further improved. Let
Therefore, in the present application, the upper connecting frame 40 is formed of a pipe member, and the space K is enlarged by reducing the vertical width of the upper connecting frame 40 as much as possible while ensuring the rigidity of the upper connecting frame 40. Expecting.
A left and right mounting rod 60 is provided in the space K, and one end of a spring 61 is locked to the mounting rod 60 and the other end of the spring 61 is locked to the headrest mounting rod 10. The spring 61 urges the headrest 6 to always move backward.

In this case, the attachment rod 60 may be formed with a rigidity that can support the elasticity of the spring 61, and thus does not hinder the “entrance of a seated person” in the space K.
Further, in the embodiment, the mounting rod 60 is bent up and down at a predetermined interval in the left-right direction, so that the mounting rod 60 can be easily deformed while absorbing an impact at the time of a rear collision.

(Operation of Example)
The dorsal frame 3 of the dorsal seat 2 is formed in a square frame shape by connecting the upper part of the left and right side frames 31 with the upper connecting frame 40 and the lower part of the side frame 31 with the lower frame lower connecting frame 41. A plate-like support member 50 is provided in the square frame of the dorsal frame 3, and the plate-like support member 50 has a plate body 51 formed in a substantially rectangular single plate shape on the back frame 3 through the wire spring 52. Since the plate-like support member 50 is configured so as to be movable, the plate-like support member 50 moves back and forth while substantially holding its plate shape by the elasticity of the plate body 51 and the wire spring 52 to support the seated person.
Further, since the plate body 51 of the plate-like support member 50 is formed in a substantially rectangular single plate shape, the load applied only to a predetermined portion of the plate body 51 is also increased by moving the entire plate body 51 backward. Distribute the load to the left and right to support it securely.

Thus, when the seated person moves backward due to the inertia due to the impact from the rear, the whole plate body 51 moves rearward, and the plate body 51 moves the collision detector 27 backward after the movement, and the rear of the rear collision sensor 27 The lower link 25 is rotated by the movement to pull the transmission member 20 downward. The transmission member 20 rotates the upper link 11 about the shaft 17, and the upper link 11 moves the headrest mounting rod 10 forward about the shaft 17. The headrest 6 is moved forward about the shaft 17 by rotating.
Therefore, the headrest 6 is rotated forward by the upper link 11 of the active headrest mechanism A to support the head, thereby improving the neck impact mitigation performance.
In this case, the dorsal frame 3 connects the upper parts of the left and right side frames 31 with the upper connecting frame 40, and the upper connecting frame 40 is directed downwardly by the horizontal hook part 42 and the vertical hook part 43 formed by a cylindrical member. And the active headrest mechanism A is located in the space K surrounded by the horizontal flange portion 42 and the vertical flange portion 43 of the downwardly connected “U” -shaped upper connecting frame 40, so that it can be As one of the neck impact mitigation measures, the rear body is positively allowed to move due to the inertia of the upper body of the seated person T, which is said to be “entrance of the seated person”, and the impact of the rear impact is released by the space K. Relax.

That is, the upper connecting frame 40 of the dorsal frame 3 is formed of a pipe member, and the upper connecting frame 40 is configured such that the lower part of the vertical saddle part 43 of the horizontal saddle part 43 on the left and right sides of the horizontal saddle part 42 Since the overlapping portions are overlapped and fixed by welding, the upper connecting frame 40 formed by the horizontal flange portion 42 and the vertical flange portion 43 has sufficient strength as the dorsal frame 3 having the active headrest mechanism A. The rigidity is secured.
Therefore, the hollow frame-shaped dorsal frame 3 does not require a plate member between the left and right vertical flange portions 43 of the upper connecting frame 40, and is a sufficiently wide space below the horizontal flange portion 42 of the upper connecting frame 40. The portion K can be formed, and the “entrance of the seated person” is not limited, and the impact of the rear impact is mitigated by the space portion K.

  The active headrest mechanism A includes a headrest mounting rod 10 in the left-right direction to which a pillar support member 9 that supports the pillar 8 is mounted, and an upper link 11 that moves the headrest mounting rod 10 forward with respect to the back seat 2. The upper link 11 is formed by the upper plate 13, the rear plate 14, and the lower plate 15 to form a bracket portion bracket portion 12 having a “U” -shaped cross section, and the upper plate 13, the rear plate 14, and the lower plate 15. Since the end portion of the headrest mounting rod 10 formed in a pipe shape is fitted and fixed in the space of the bracket portion 12 surrounded by the bracket portion 12, the upper plate 13, the rear plate 14, and the lower plate 15 of the bracket portion 12 are fixed. Are fixed to the headrest mounting rod 10.

Therefore, the load applied to the active headrest mechanism A is reliably supported by the upper link 11 and the headrest mounting rod 10 formed in a pipe shape, and there is no influence of providing the space portion K.
Further, since the upper connecting frame 40 is formed of a cylindrical member, the torsional rigidity is high, the strength is sufficient, the number of parts is reduced, the mounting accuracy is improved, and a rational configuration is obtained.
Since the back support frame 3 is provided with the plate-like support member 50, the plate-like support member 50 can support the entire upper body of the seated person with a “surface”, and the headrest 6 that moves forward has the head rest. Since the plate-like support member 50 supports the upper body of the seated person with the “surface” when supporting the part, the sitting posture of the seated person including the head is extremely stabilized.

In this case, the upper edge 53 of the plate body 51 is positioned at least above the vicinity of the ninth thoracic vertebra X of the average seated person T, and the upper edge 53 of the plate body 51 and the recumbent portion 42 of the upper connection frame 40 are located. Since the space portion K is formed as wide as possible, the space between the upper edge 53 of the plate body 51 and the horizontal flange portion 42 of the upper connecting frame 40 is formed in the space portion K, and the rear Since there is no member that blocks the backward movement of the seated person at the time of the collision, the “sitting person's entry” is positively allowed, and the impact of the rear collision is reduced.
That is, the vicinity of the ninth thoracic vertebra X is the position of the center of gravity of the upper body, and at least the upper edge 53 of the plate body 51 is positioned above the vicinity of the ninth thoracic vertebra X so that the plate body 51 maintains a good sitting posture. On the other hand, at the time of the rear collision, the wide space K above the upper edge 53 of the plate body 51 does not inhibit the “entrance of the seated person”, and a rational configuration is obtained.

Therefore, the upper link 11 constituting the upper link 11 is formed in an L shape along the horizontal flange portion 42 and the vertical flange portion 43 of the upper connection frame 40 by the bracket 12 and the link portion 16 when viewed from the front, Since 16 is formed in a straight line shape along the vertical flange 43 in front view, the space occupied by the active headrest mechanism A in the space K is made as small as possible to improve the “entrance of the seated person”.
Thus, the lower link 25 for transmitting the rearward movement of the rear collision detector 27 to the upper link 11 of the active headrest mechanism A is formed by a vertical plate member, and the mounting plate portion is intermediate between one end and the other end of the lower link 25. 30 is brought into contact with the intermediate projecting portion 32 between the front and rear sides of the left and right side frames 31 of the back frame 3 and attached by a shaft 33, and the lower link 25 on the front side of the shaft 33 is formed on the arm portion 35. The transmission member 20 and the rear collision detector 27 are attached to the lower link 25. The lower link 25 protrudes rearward from the shaft 33 and is formed on the restriction plate portion 37. 25, the armrest 35 of the lower link 25 is further moved backward by moving the headrest 6 forward by the active headrest mechanism A to support the head, and the rear collision detector 27 further moves backward. 5 is pulled inwardly, the restriction plate portion 37 of the lower link 25 opposite the pulled arm portion 35 contacts and supports the inner surface of the side frame 31, and the lower link 25 and The bending of the arm part 35 is suppressed.

The arm portion 35 of the lower link 25 is not loaded so as to bend inward until the active headrest mechanism A is operated, and is not deformed during “turning” for operating the active headrest mechanism A. Since it is assumed that the active headrest mechanism A is deformed when a larger force is applied to the rear collision detector 27, the restricting plate portion 37 of the lower link 25 comes into contact with the inner surface of the side frame 31. To prevent the arm portion 35 of the lower link 25 from being deformed.
In this case, since the bulging portion 38 protruding toward the side frame 31 is formed in the regulating plate portion 37, the bulging portion 38 on the distal outer surface side of the regulating plate portion 37 abuts on the inner surface of the side frame 31. Since the bulging portion 38 has a smaller contact area than the restriction plate portion 37, the rotation resistance of the lower link 25 can be reduced more than the restriction plate portion 37, which is preferable.

Accordingly, since the predetermined gap S is provided between the regulating plate portion 37 or the bulging portion 38 of the lower link 25 and the inner surface of the side frame 31, the “rotation” for operating the active headrest mechanism A is performed. ”Is reduced to improve the operability.
That is, until the active headrest mechanism A is actuated, no load is applied so that the arm portion 35 of the lower link 25 bends inward, so that the restricting plate portion 37 or the bulging portion 38 and the side portion of the lower link 25 Although the active headrest mechanism A can be operated even if the gap S between the inner surface of the frame 31 is “zero”, the restriction plate portion 37 or the bulging portion 38 of the lower link 25 and the side portion can be operated. Since a predetermined gap S is provided between the inner surface of the frame 31, it is possible to reduce the rotational resistance of the lower link 25 and to prevent the generation of abnormal noise, and to restrict the lower link 25. Manufacture and assembly are facilitated by making it unnecessary to set the gap S between the bulging portion 38 of the portion 37 and the inner surface of the side frame 31 to “zero”.
Therefore, it is possible to configure the back frame 3 by reducing the thickness of the side frame 31.

The perspective view of a dorsal fin seat and a headrest. The perspective view of the frame of a dorsal fin seat. The same side view. The front view. The perspective view of the lower side link mechanism part of a headrest. FIG. The side view of the frame of a dorsal fin seat. The seating state schematic diagram of a dorsal fin seat.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Back seat, 3 ... Back seat frame, 4 ... Cushion material, 8 ... Pillar, 9 ... Support member, 10 ... Headrest attachment collar, 3 ... Backrest frame, 11 ... Upper link, 12 ... bracket part, 13 ... upper plate, 14 ... rear plate, 15 ... lower plate, 16 ... link part, 17 ... shaft, 20 ... transmission member, 21 ... shaft, 25 ... lower link, 26 ... shaft, 27 ... rear Projection detector, 28 ... shaft, 30 ... mounting plate portion, 31 ... side frame, 32 ... intermediate protrusion, 33 ... shaft, 35 ... arm portion, 37 ... regulating plate portion, 38 ... bulging portion, 40 ... upper portion Connection frame, 41 ... lower connection frame, 42 ... horizontal flange, 43 ... vertical flange, 45 ... side plate, 50 ... plate support, 51 ... plate body, 52 ... wire spring, 53 ... upper edge, 60 ... Mounting rod, 61 ... spring,

Claims (5)

The headrest 6 is attached to the backrest frame 3 by the active headrest mechanism A so as to be movable back and forth, and the backrest frame 3 is provided with a rear impact detection body 27 for detecting a rearward movement near the waist of the seated person during the rear impact. The collision detector 27 and the active headrest mechanism A are connected via a link mechanism L, and the headrest 6 is moved forward by the rearward movement of the rear collision detector 27 to support the head of the seated person. The dorsal frame 3 includes at least the upper connecting frame 40 provided with the active headrest mechanism A by a cylindrical member, and is surrounded by the upper connecting frame 40 and the left and right side frames 31 on the upper part of the dorsal frame 3. A vehicle seat in which the space K is formed. 2. The upper connecting frame 40 according to claim 1, wherein the upper connecting frame 40 is formed in a downward "U" shape by a horizontal flange portion 42 and a vertical flange portion 43 formed by a cylindrical member, and the active headrest mechanism A is an upper connecting frame having a downward "U" shape. A vehicle seat positioned in a space K surrounded by 40 recumbent portions 42 and vertical reed portions 43. 3. The vehicle seat according to claim 2, wherein the lower portion of the vertical flange portion 43 on both the left and right sides of the upper connecting frame 40 is overlapped with the upper portion of the side frame 31 of the back frame 3, and the overlapped portion is welded and fixed. 4. The active headrest mechanism A according to claim 3, wherein the active headrest mechanism A includes a headrest mounting rod 10 in a left-right direction to which a pillar support member 9 that supports the pillar 8 is mounted, and an upper side that moves the headrest mounting rod 10 forward relative to the back seat 2. The upper link 11 is formed on the bracket portion bracket portion 12 formed in a cross-section “U” shape by the upper plate 13, the rear plate 14, and the lower plate 15. The link part 16 which connected the transmission member 20 which transmits operation | movement is formed integrally, and this link part 16 is attached to the said vertical collar part 43 with the axis | shaft 17, and the said upper board 13, the rear board 14, and the lower board A vehicle seat in which an end portion of a headrest mounting rod 10 formed of a cylindrical member is fitted and fixed in a space of a bracket portion 12 surrounded by 15. 4. The back part of a seated person separate from the rear impact sensor 27 can be supported in the hollow square frame of the dorsal fin frame 3 according to claim 1, 2 or 3 or 4. A single plate-like plate-like support member 50 is attached to the dorsal frame 3 via a wire spring 52 so as to be movable back and forth, and the rear collision detector 27 is provided behind the plate-like support member 50. The upper edge 53 of the plate-like support member 50 is positioned at least above the vicinity of the ninth thoracic vertebra X of the average seated person T, and between the upper edge 53 of the plate-like support member 50 and the upper connection frame 40. A vehicle seat configured to form a space K that is as wide as possible.

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