JP4450316B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat provided with a headrest that moves forward and supports a head H in a so-called “rear collision” in which a seated person T moves backward due to inertia in response to a collision from the rear. is there.

Conventionally, a configuration in which a headrest provided on an upper portion of a backrest seat rotates forward by a movable frame in a backrest seat located behind the back of the seated person to support the head of the seated person is known. is there.
JP-A-10-119619

In the known example, the headrest and the movable frame are directly connected to each other by a frame, and this frame is provided in the back seat, so that there is a problem that the seating feeling is lowered.
That is, the headrest and the movable frame are directly connected to each other for the idea of converting the energy of the movable frame that moves backward into the forward rotation of the headrest about the rotation center axis.
In this configuration, the movable frame and the frame are inevitably provided in the backrest seat of the portion where the back of the seated person hits, so that the seating feeling decreases.
In addition, since the movable frame moves backward in the back seat, there is a limit to the amount of movement, and therefore the amount of movement of the headrest cannot be increased, and the amount of movement of the headrest is sufficient to support the head of the seated person. And there is a problem that the effect of preventing whiplash cannot be fully exhibited.
That is, the amount of movement of the headrest is limited because the amount of movement of the movable frame rearward is converted into the movement of the headrest forward about the rotation center, just like a seesaw.
Further, in the known example, since the headrest and the movable frame are directly connected, even if the headrest that is rearwardly moved and moves forward supports the head, the movable frame moves backward. There is also a problem that the difference between the front and rear positions with respect to the head widens and the sitting posture deteriorates.
The present application is configured to detect the backward movement load of the seated person by the front and rear moving body located behind the back of the seated person, while ensuring a sufficient amount of movement of the headrest, and when detecting a rear collision, the sitting posture is set. It has been devised to avoid breaking down.

In the present invention, the headrest 6 formed by providing the pillar 8 on the head support portion 7 that supports at least the head H of the seated person T is moved up and down in the left-right direction in the dorsal seat 2 positioned behind the seated person T. The rear collision detector 25 having a predetermined height is configured to be moved forward by the rear movement of the rear collision detector 25 to support the head H of the seated person T. The rear impact sensor 25 is attached to the back frame 3 of the back seat 2 separately from the headrest 6 below the upper and lower intermediate positions, and the rear impact detector 25 moves the rear impact detector 25 backward by a link mechanism. 6, a plate body 31 having a substantially rectangular single plate shape and having a predetermined elasticity is attached to the back frame 3 of the back sheet 2 to the back frame 3 via a wire spring 32. Freely movable With providing a plate-shaped supporting member 30 constructed, the rear side of the plate body 31, allowing the longitudinal movement during normal running of the plate member 31, and the rear end collision is provided a predetermined interval appreciable The rear collision detection body 25 is disposed independently of the plate body 31, and is configured so that the plate body 31 abuts on the rear collision detection body 25 and moves the rear collision detection body 25 backward at the time of rear collision. This is a vehicle seat.
In the present invention, a headrest 6 formed by providing a pillar 8 on a head support portion 7 that supports at least a head H of a seated person T is used as a rear collision detector in the dorsal seat 2 positioned behind the seated person T. 25, the pillar 8 is attached to the headrest attachment rod 10 in the left-right direction, and the left and right sides of the headrest attachment rod 10 are a pair. The upper link rod 15 is fixed to the upper portion of the upper link rod 15, and the upper and lower intermediate portions of the upper link rod 15 are pivotally attached to the dorsal frame 3 of the dorsal seat 2 by the rotation shaft 16. A portion above the pivot shaft 16 is formed on the upper link arm portion 22 and a portion below the pivot shaft 16 is formed on the lower link arm portion 23. The upper link arm portion 22 is formed longer than the lower link arm portion 23, Lower link arm 23 is inclined so as to be located on the front side as it goes down, and an upper part of the transmission member 20 that moves downward by the rearward movement of the rear collision detector 25 is attached to the lower part of the lower link arm part 23, and the lower part of the transmission member 20 Is attached to the lower link 26, the rear impact sensor 25 is attached to the lower link 26, and a plate body 31 formed in a substantially rectangular single plate shape is attached to the back frame 3 of the back sheet 2. A plate-like support member 30 is provided that is configured to be movable back and forth on the back frame 3 via a spring 32, and allows the plate body 31 to move back and forth during normal running on the rear side of the plate body 31, In addition, the rear collision detector 25 is disposed independently of the plate body 31 with a predetermined interval at which a rear collision can be sensed. After the bump detector 25 It is obtained by the configuration the vehicle seat so as to move to.
In the present invention, the plate body 31 of the plate-shaped support member 30 is configured to be elastically deformed while having a predetermined strength capable of supporting the seated person T by a synthetic resin in a substantially rectangular single plate shape, The wire spring 32 is a vehicular seat having a predetermined elasticity so that the entire plate body 31 can move backward while maintaining the surface shape.
In the present invention, the upper and lower wire springs 32A and 32B are arranged side by side in the upper and lower wire springs 32A and 32B, and both the upper and lower wire springs 32A and 32B have left and right ends. It is attached to the dorsal frame 3 side in a fixed state, and an intermediate part thereof is attached to the plate body 31. The plate body 31 is fixed to the dorsal frame 3 side at upper and lower left and right four places by the upper wire spring 32A and the lower wire spring 32B The vehicle seat is attached to the vehicle.
In the present invention, the upper edge of the plate body 31 is positioned above the vicinity of the ninth thoracic vertebra X of the average seated person T, and the upper wire spring 32A of the wire springs 32 is located behind the vicinity of the ninth thoracic vertebra X. The vehicle seat is positioned.
In the present invention, the upper side edge 35 of the upper portion 34 of the plate body 31 is formed in a substantially straight shape so that the upper portion 34 has substantially the same left and right width, and the plate below the upper portion 34 is formed. The plate middle part 36 between the upper and lower parts of the body 31 is formed with its left and right side edges in the middle arc part 37 so that the upper and lower middle parts of the plate middle part 36 have the narrowest arc shape. This is a vehicle seat in which the rear impact detector 25 is disposed on the rear side of the portion 36.
In the present invention, the lower portion 40 of the plate body 31 below the plate intermediate portion 36 forms iliac support portions 41 protruding laterally on the left and right sides, and the lower side of the iliac support portion 41 is downward. A sacrum support portion 43 protruding downward is formed at the confluence of the left and right lower arc portions 42, and the lower wire spring 32 B of the wire springs 32 is formed. Is a vehicle seat positioned on the rear side between the narrowest portion of the plate intermediate portion 36 and the iliac support portion 41.

In the first and second aspects of the invention, the rear collision detector 25 is provided on the rear side of the plate body 31 supported by the surface, and the rear collision detector 25 and the headrest 6 are connected via a link. The rear collision detector 25 detects the rear collision without breaking the sitting posture, and the head H can be supported by moving the headrest 6 forward.
In the invention of claim 3 , the seating posture is further stabilized and the seating posture is stabilized.
In the invention of claim 4 , the interference between the rear collision detector 25 and the plate body 31 can be prevented, and a rational configuration can be achieved.
According to the fifth aspect of the present invention, the back movement load of the seated person T is detected by the rear collision detector 25 provided in the vicinity of the waist, and the waist of the seated person T can be held well.

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a vehicle seat, 2 denotes a dorsal seat 2 of the vehicle seat 1, and the dorsal seat 2 has a cushion material 4 attached to a dorsal frame 3, and the cushion material The outer periphery of 4 is surrounded by the 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 includes at least a head support portion 7 that supports the head H of the seated person T and a pillar 8 that is attached to the dorsal seat 2.
The pillar 8 of the headrest 6 is attached to a pillar support member 1111 provided on the headrest attachment rod 10 in the left-right direction so that the height can be adjusted. Although the structure of the pillar 8 and the pillar support member 11 is well-known and illustration is abbreviate | omitted, the engagement member provided in the pillar support member 11 should just be engaged with the engagement recessed part formed in the pillar 8, and may be hold | maintained.

The left and right sides of the headrest mounting rod 10 are fixed to the upper portion of the upper link rod 15 that moves the headrest 6 back and forth. An upper and lower intermediate portion of the upper link rod 15 is rotatably attached to a side frame 17 of the back frame 3 by a rotation shaft 16. The upper part of the transmission member (rod) 20 is attached to the lower part of the upper link rod 15 by the shaft 21.
In this case, the upper link rod 15 is formed on the upper link arm portion 22 on the upper side of the rotation shaft 16, and is formed on the lower link arm portion 23 on the lower side of the rotation shaft 16. The arm portion 23 is formed in an inverted “<” shape, and the upper link arm portion 22 is formed longer than the lower link arm portion 23. Further, the upper link rod 15 is attached so as to be inclined so that the lower link arm portion 23 is positioned on the front side as it goes downward with respect to the rotation shaft 16.

Therefore, the back collision frame 3 is provided with a rear collision detector 25 that moves backward by the backward movement of the seated person T collided from behind. The rear collision detector 25 is attached to the lower part of a pair of lower links 26 provided on the dorsal frame 3 by attachment shafts 27 on both sides thereof. The upper part of the lower link 26 is pivotally attached to the side frame 17 of the dorsal frame 3 by a pivot shaft 28. The lower part of the transmission member 20 is attached to the upper and lower intermediate parts of the lower link 26 by a shaft 29, and when the rear collision detector 25 moves rearward by the backward movement of the seated person T, this energy is transferred to the lower link 26 and the transmission member 20. The upper link rod 15 thereby moves the headrest 6 forward and supports the head H of the seated person T.
In this case, when the rear collision detector 25 moves backward, the lower link 26 pulls the transmission member 20 downward, the transmission member 20 rotates the lower portion of the upper link rod 15 downward, and the upper portion of the upper link rod 15 The headrest 6 is moved forward by rotating forward.

Therefore, the upper link rod 15 amplifies the movement amount of the rear collision detector 25 and moves the headrest 6 forward, so that the movement amount of the headrest 6 can be sufficiently secured, and the head H of the seated person T is reliably supported. To.
The rear impact detector 25 is positioned on the rear side of the cushion material 4, but the rear impact detector 25 and the cushion material are shown in FIG. 4 is shown as being overlapped, but this does not limit the configuration.
Thus, each member of the lower link 26 and the upper link rod 15 is formed in a plate shape, and is attached to the left and right side frames 17 of the dorsal frame 3, so that the left and right left and right side frames 17 are arranged. The rear collision detector 25 is only positioned between the two, so that the seated person T does not feel uncomfortable or uncomfortable at the time of sitting.

Therefore, a plate-like support member 30 is provided on the dorsal frame 3 of the dorsal seat 2. The plate-like support member 30 supports the upper body of the seated person T. The plate-like support member 30 supports the upper body of the seated person T with a “surface”, stabilizes the sitting posture, and favorably supports the head H by the headrest 6.
That is, in the conventional zigzag spring configuration arranged vertically, the upper body of the occupant T is supported by a “line” by each zigzag spring that moves backward due to a load. Even if the headrest 6 to be supported supports the head H, the upper body of the seated person T moves backward, and the positional relationship between the head H and the upper body becomes unstable. When the support member 30 can support the entire upper body of the seated person T with a “surface” and the headrest 6 moving forward supports the head H, the plate-like support material 30 supports the upper body of the seated person T. Since it is supported by the “surface”, the sitting posture of the seated person T including the head H is extremely stabilized.

The plate-like support member 30 is formed by a substantially quadrilateral single plate-like plate body 31, and the plate body 31 has a predetermined strength capable of supporting the seated person T by a synthetic resin such as polypropylene. If it is configured to support the load while elastically deforming to some extent when it receives a rear load (including the case of body weight) from the seated person T, the feeling at the time of back contact, which is so-called “hit”, can be made flexible. is there.
The plate-like support member 30 is configured by attaching the plate body 31 to the dorsal frame 3 through a wire spring 32 such as a zigzag spring or a formed wire spring so as to be movable back and forth. Supporting the seated person T back and forth while holding.

In this case, the wire spring 32 has a predetermined elasticity, and is configured such that when a load is applied to the plate body 31, the entire plate body 31 can move rearward while maintaining the surface shape.
Thus, the upper edge of the plate body 31 is formed in the upper arc portion 33 having a low arc shape at the center, and the upper arc portion 33 is positioned above the vicinity X of the ninth thoracic vertebra of the average seated person T.
The ninth thoracic vertebra vicinity X 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), and the upper edge of the plate body 31 is positioned above the vicinity of the ninth thoracic vertebra X Thus, the plate-like support member 30 supports the center of gravity position of the upper body of the seated person T.

In this case, the upper wire spring 32A of the wire springs 32 is positioned slightly below the ninth thoracic vertebra vicinity X to support a load applied obliquely rearward and downward from the ninth thoracic vertebra vicinity X. It is preferable because it can effectively support the upper body of T.
Accordingly, the upper side edge 35 of the upper portion 34 of the plate body 31 having the upper arc portion 33 is formed in a substantially linear shape so that the upper portion 34 has substantially the same left-right width. Thereby, the upper part 34 can support the upper body of the seated person T in a surface state.
The plate middle portion 36 of the plate body 31 below the upper portion 34 has left and right side edges formed in an arc-shaped middle arc portion 37 so that the upper and lower middle portions are narrowest. The vicinity of the waist of the occupant T does not require much support in the sitting posture, but rather causes seating fatigue and low back pain due to compression. Therefore, the left and right side edges of the plate intermediate portion 36 are formed in the intermediate arc portion 37, The seated person T is released. Further, the size of the seated person T in the vicinity of the waist has a large individual difference. In this respect as well, it is preferable to form the plate intermediate portion 36 of the plate body 31 in the intermediate arc portion 37.

In this case, the rear collision detector 25 is positioned behind the plate middle portion 36 of the plate body 31.
That is, by providing the plate-like support member 30 on the dorsal frame 3, it is possible to detect a rear-end collision if the rear-end collision detector 25 is provided behind any portion from the upper end to the lower end of the plate-like support member 30. The plate intermediate portion 36 of the plate-like support member 30 has a large rearward movement amount, and when the rear impact occurs, the rear impact detector 25 can be moved greatly to reliably detect the rear impact, and the rear impact detector 25. The upper portion of the plate-like support member 30 is moved backward by a predetermined amount, and the support of the upper body of the seated person T is insufficient. The rear collision detector 25 is positioned at the position.
Therefore, both the support of the seated person T by the plate-shaped support member 30 and the certainty of the detection of the rear collision by the rear collision detector 25 can be achieved.
It should be noted that the load applied during normal travel is supported by the plate body 31 of the plate-like support member 30, and the rear collision detector 25 is not moved backward. Therefore, it goes without saying that the plate body 31 allows a back-and-forth movement during normal running and a predetermined interval at which the rear collision can be sensed between the plate body 31 and the rear collision detection body 25.

Thus, the lower portion 40 of the plate body 31 below the plate intermediate portion 36 forms iliac support portions 41 protruding laterally on the left and right sides, respectively, and the lower side from the iliac support portion 41 goes downward. A sacrum support portion 43 is formed on the lower arc portion 42 of a narrow arc shape and protrudes downward at the junction of the left and right lower arc portions 42.
That is, by supporting the vicinity of the iliac R portion forming the upper part of the pelvis by the iliac support portion 41, the waist of the seated person T is securely held.
Similarly, by supporting the vicinity of the sacrum S portion of the seated person T by the sacrum support part 43, the waist of the seated person T is securely held.

Thus, when the lower wire spring 32B of the wire spring 32 is positioned above the iliac support portion 41 and below the narrowest width portion of the intermediate arc portion 37, the waist portion of the seated person T is effectively used. It is possible to support it.
That is, the upper wire spring 32A and the lower wire spring 32B support the seater T near the ninth thoracic vertebra and the vicinity of the pelvis and sacrum, so that the back (waist) of the seater T is supported at two upper and lower points. By suppressing the pressure applied to the spine between the spring 32A and the lower wire spring 32B, an effect of reducing fatigue at the time of sitting can be expected, which is preferable.
In addition, since the lower wire spring 32B is provided in the vicinity of the pelvis and sacrum, the lower portion of the plate-like support member 30 becomes a “plane” in the case of a rear collision and moves backward integrally, thereby detecting the rear collision. It is also expected that the body 25 is reliably moved backward to ensure the detection of a rear collision.

Thus, the upper and lower wire springs 32A and 32B are arranged in parallel at the upper and lower wire springs 32A, and the single plate-like plate body 31 is supported at four upper and lower and left and right positions, and is seated on the planar body. The person T is supported. The upper wire spring 32A and the lower wire spring 32B of the wire spring 32 are both attached to the dorsal frame 3 in a fixed state at both left and right ends, and an intermediate portion thereof is formed in a bent portion 44 that is appropriately bent in the vertical direction. The bent body 44 is configured to support the plate body 31 in a surface state.
Further, the left and right intermediate portions of the wire spring 32 fix a predetermined portion of the bent portion 44 to the plate-like support member 30 with an arbitrary configuration such as a locking tool 45.

(Operation of Example)
The pillar support member 11 that supports the pillar 8 of the headrest 6 is fixed to the headrest mounting rod 10, and both the left and right sides of the headrest mounting rod 10 are fixed to the upper portion of the upper link rod 15.
The upper and lower intermediate portions of each upper link rod 15 are attached to the side frame 17 by the rotation shaft 16, the upper portion of the transmission member 20 is attached to the lower end portion of the upper link rod 15, and the lower portion of the transmission member 20 is the upper portion of the side frame 17. Since the left and right sides of the rear impact detector 25 are attached to the lower part of the lower link 26 in a connected state, the seat is seated by inertia by receiving an impact from the rear. When T moves rearward, the rear collision detector 25 moves rearward, and the lower link 26 rotates by the rear movement of the rear collision detector 25 to pull the transmission member 20 downward, and the transmission member 20 moves upward. The lower link arm portion 23 of the flange 15 is rotated downward about the rotation shaft 16, the upper link arm portion 22 of the upper portion of the upper link rod 15 is rotated forward about the rotation shaft 16, and the headrest mounting rod 10 is rotated. Rotate forward about the axis 16 and Headrest 6 is moved forward to the pivot shaft 16 centered by Les.
Therefore, the headrest 6 is rotated forward by the upper link rod 15 to support the head H, and has an effect of preventing whiplash.

  Thus, the upper link rod 15 is formed with the upper part of the upper link arm portion 22 above the rotation shaft 16 and the lower link arm portion 23 with the lower portion of the rotation shaft 16. Since it is formed longer than the arm portion 23, the movement amount of the headrest mounting rod 10 can be remarkably increased with respect to the movement amount of the rear collision detector 25 (the vertical movement amount of the transmission member 20). The headrest 6 located above the heel 10 further increases the amount of forward movement, can sufficiently secure the amount of movement, and ensures the support of the head H of the seated person T.

In this case, since the lower link arm portion 23 of the upper link rod 15 is inclined so as to be positioned on the front side as it goes downward, the upper link rod 15 moves rearward of the rear collision detector 25 via the transmission member 20. Is converted to forward movement, and the headrest 6 is moved forward.
Therefore, the upper link rod 15 moves the lower link arm portion 23 backward to move the headrest 6 forward, so that the operating direction of the lower link arm portion 23 is the reverse rotation opposite to the direction in which the cushion material 4 is pressed. Thus, the presence of the cushion material 4 does not hinder the operation of the lower link arm portion 23, but rather operates effectively so that a rational configuration is obtained.

In other words, if the operating direction of the lower link arm portion 23 is set to the front side, the elasticity of the cushion material 4 is contrary to the operation of the lower link arm portion 23, and the operation load of the upper link rod 15 is increased and effective. Does not work.
Therefore, since the lower link arm portion 23 moves rearward about the rotation shaft 16, it is not necessary for the lower link arm portion 23 to push the cushion material 4 or the skin member 5 forward when the upper link rod 15 is operated. Operates on.
Accordingly, the lower link 26 is attached to the side frame 17 at the upper portion thereof by the rotation shaft 28, and the rear collision detector 25 is attached to the lower portion thereof by the attachment shaft 27, and between the side frame 17 and the attachment shaft 27. Since the lower part of the transmission member 20 is attached by the shaft 29, the lower link 26 is located behind the rear collision detector 25 on the principle of scissors, with the attachment shaft 27 as a force point, the rotation shaft 28 as a fulcrum, and the shaft 29 as an action point. The operating force to be moved is doubled and the shaft 29 is pulled.
Further, since the lower link 26 is inclined so that it is normally positioned on the front side as it goes downward, the lower link 26 is rearward about the rotation shaft 28 at the time of a rear collision that receives an impact from the rear. Rotate.

Therefore, similarly to the lower link arm portion 23 of the upper link rod 15, the lower link 26 has a rational configuration in which the operating direction matches the moving direction (rearward movement) of the seated person T, and the cushion material is used during the operation. 4 and the skin member 5 are also operated reliably while avoiding interference.
Therefore, the operating mechanism S of the upper link rod 15, the transmission member 20, and the lower link 26 has the operating direction in the rear direction even when the cushion material 4 and the skin member 5 are present on the front side thereof. In addition, the interference of the pressure by the skin member 5 can be avoided, and the loss can be eliminated as much as possible when the movement of the rear collision detector 25 is transmitted to the headrest 6 to ensure the operation.

Thus, the back frame 3 of the back sheet 2 is provided with a plate-like support member 30, and the plate-like support member 30 is a plate body 31 formed in a substantially rectangular single plate shape via a wire spring 32. Since it is configured to be attached to the frame 3 so as to be movable back and forth, the plate-like support member 30 moves back and forth while supporting it to support the seated person T.
Therefore, the seating feeling is greatly improved as compared with the conventional zigzag spring configuration in which the upper and lower sides are arranged side by side and supported by “lines”.
In the zigzag spring supported by the “line”, even if the head H is supported by the headrest 6 that moves forward at the time of the rear collision, the upper body of the seated person T becomes unstable and the head H and the upper body However, in the present application, since the entire upper body of the seated person T is supported by the “plane” by the plate-like support member 30, the head portion 6 is coupled with the headrest 6 that moves forward. H and the upper body of the seated person T can be favorably supported, and the sitting posture of the seated person T including the head H is extremely stabilized.

In addition, since the plate body 31 of the plate-like support member 30 is formed in a substantially rectangular single plate shape, the load applied only to a predetermined portion of the plate body 31 can be increased or decreased by moving the entire plate body 31 backward. Distribute the load to the left and right to support it securely.
That is, for example, if the upper and lower plate bodies 31 are divided and formed, when a load is applied to a portion between the upper and lower plate bodies 31, the upper and lower plate bodies 31 may rotate and cannot reliably support the load. However, in the present application, since the plate-like support member 30 is formed by the substantially rectangular single plate-like plate body 31, the load applied to the middle of the upper and lower sides is reliably received and supported by the entire plate-like support member 30.

Since the upper arc portion 33 of the upper edge of the plate body 31 of the plate-like support member 30 is positioned above the vicinity of the ninth thoracic vertebra X of the average seated person T, it is the center of gravity position of the upper body, In addition, the plate body 31 reliably supports the vicinity of the ninth thoracic vertebra X in the portion of the spinal column that does not change in the sitting posture (the movement amount is small), so that the sitting posture can be stabilized.
Therefore, also in this respect, the state of the rearward seated person T is reliably supported.
Further, since the upper wire spring 32A of the wire springs 32 is located behind the ninth thoracic vertebrae X, the load applied to the upper body of the seated person T by the upper wire springs 32A can be more effectively and reliably ensured. To support.

Therefore, the upper side edge 35 of the upper portion 34 of the plate body 31 having the upper arc portion 33 is formed in a substantially straight shape so that the upper portion 34 has substantially the same left and right width. The upper portion 34 supports the upper body of the seated person T in a surface state and stabilizes the sitting posture.
Thus, the plate middle portion 36 of the plate body 31 below the upper portion 34 is formed with the side edge at the middle arc portion 37 so that the upper and lower middle portions of the plate middle portion 36 have the narrowest arc shape. Therefore, it is possible to suppress the pressure applied to the vicinity of the waist of the seated person T, which does not require much support in the sitting posture, and to prevent fatigue and low back pain. The vehicle seat 1 that is widely applicable can be provided.

In addition, since the rear impact detector 25 is provided on the rear side of the plate intermediate portion 36 of the plate body 31, the plate intermediate portion 36 having a large rearward movement amount during the rear impact greatly increases the rear impact detector 25 on the rear side. It can be moved to reliably detect a rear impact.
Further, since it is not necessary to provide the rear impact sensor 25 on the upper rear side of the plate body 31 of the plate-like support member 30, the plate-like support member 30 can reliably support the state of the seated person T at the time of the rear impact. It is also a rational configuration from the viewpoint of stabilizing the sitting posture.
In addition, since the movement direction of the plate body 31 and the rear collision detection body 25 is essentially the same, there are few cases where they interfere with each other in the relationship between them, but the lateral width of the plate intermediate portion 36 is the plate body 31 of the other portion. Therefore, the interference of the plate body 31 with respect to the mounting portion between the rear collision detector 25 and the lower link 26 can be avoided as much as possible.
Therefore, the support of the seated person T by the plate-shaped support member 30 and the certainty of the detection of the rear collision by the rear collision detector 25 can be made compatible, and a rational configuration is obtained.

Since the lower portion 40 of the plate body 31 below the plate intermediate portion 36 forms the iliac support portions 41 protruding laterally on the left and right sides, the vicinity of the iliac portion forming the upper part of the pelvis Is supported by the iliac support part 41, and the waist part of the seated person T is reliably held.
Further, since the lower side of the iliac support portion 41 is formed in the lower arc portion 42 having a narrow arc shape as it goes downward, the gluteal muscle is suppressed while suppressing pressure on the gluteal muscle of the buttocks of the seated person T. Hold the area securely and stabilize the sitting posture of the waist.
Moreover, since the sacrum support part 43 which protrudes below is formed in the confluence | merging part of the lower arc part 42 on either side, by supporting the sacrum which is a rigid body part on the structure of a human skeleton by the sacrum support part 43 Hold the waist down securely.

Thus, the lower wire spring 32B of the wire spring 32 is the intermediate arc portion 37 above the iliac support portion 41 and is positioned below the narrowest portion of the intermediate arc portion 37. The pelvic part of the lumbar part of the seated person T is supported by the lower wire spring 32B, and the sitting posture is stabilized.
Further, the plate body 31 of the plate-like support member 30 supports the vicinity of the ninth thoracic vertebra of the seated person T and the vicinity of the pelvis / sacrum by the upper wire spring 32A and the lower wire spring 32B. (Waist) is supported at two points, upper and lower, to reduce the stress applied to the spine between the upper wire spring 32A and the lower wire spring 32B, thereby reducing fatigue during sitting.

Since the upper and lower wire springs 32A and 32B are arranged side by side in the upper and lower wire springs 32A and 32B, the upper and lower wire springs 32A and 32B form a single plate-like plate-like support material. The plate body 31 of 30 is supported by four places up and down, right and left, and supports the seating person T in a surface state.
The upper wire spring 32A and the lower wire spring 32B of the wire spring 32 are both attached to the dorsal frame 3 in a fixed state at both left and right ends, and an intermediate portion thereof is formed as a bent portion 44 bent appropriately in the vertical direction. Therefore, the bending portion 44 prevents the plate-like support member 30 and the wire spring 32 from being displaced and acts so that the plate-like support member 30 supports the load in a surface state.
Note that the lumbar support device is well known as a device that supports the waist portion of the dorsal fin sheet with a planar member, but the lumbar support actively presses and holds the planar contact member against the waist portion. The single elastic deformation of the plate body 31 and the elastic deformation of the wire spring 32 between the plate body 31 and the back frame 3 are entangled and are not supported.

The perspective view of a dorsal fin seat and a headrest. FIG. FIG. The perspective view of a dorsal seat frame (a plate-like support material is omitted). The perspective view of a dorsal fin seat frame. Sectional drawing of a dorsal fin sheet. FIG. 3 is a schematic side view of a seated person's skeleton and dorsal seat frame.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Backrest seat, 3 ... Backrest frame, 4 ... Cushion material, 5 ... Skin member, 6 ... Headrest, 8 ... Pillar, 10 ... Headrest mounting collar, 11 ... Pillar support member, 15 ... Upper link rod, 16 ... Rotating shaft, 17 ... Side frame, 20 ... Transmission member, 21 ... Shaft, 22 ... Upper link arm, 23 ... Lower link arm, 25 ... Rear collision detector, 26 ... Lower Side link, 27 ... Mounting shaft, 28 ... Rotating shaft, 29 ... Shaft, 30 ... Plate support, 31 ... Plate body, 32 ... Wire spring, 33 ... Upper arc portion, 34 ... Upper portion, 35 ... Upper side Edge, 36 ... Plate middle part, 37 ... Middle arc part, 40 ... Lower part, 41 ... Iliac support part, 42 ... Lower arc part, 43 ... Sacral support part, 44 ... Bending part, 45 ... Locking part (Locking tool).

Claims (7)

A headrest 6 formed by providing a pillar 8 on the head support portion 7 that supports at least the head H of the seated person T has a predetermined height in the left-right direction within the dorsal seat 2 positioned behind the seated person T. The rear collision detector 25 is configured to move forward to support the head H of the seated person T by moving the rear collision detector 25 backward. It is attached to the back frame 3 of the dorsal seat 2 separately from the headrest 6, and the rear collision detector 25 transmits the rearward movement of the rear collision detector 25 to the headrest 6 by a link mechanism. A plate body 31 having a substantially rectangular plate shape and having a predetermined elasticity is attached to the dorsal frame 3 of the dorsal seat 2 via a wire spring 32 so as to be movable back and forth. Te Was a plate-like support member 30 is provided, on the rear side of the plate body 31, allowing the longitudinal movement during normal running of the plate member 31, and the rear end collision is the plate member with a predetermined interval appreciable The rear collision detector 25 is disposed independently of the vehicle 31 and the vehicle is configured such that the plate body 31 contacts the rear collision detector 25 and moves the rear collision detector 25 rearward during a rear collision. Sheet. The headrest 6 formed by providing the pillar 8 on the head support 7 that supports at least the head H of the seated person T is moved rearward of the rear collision detector 25 in the dorsal seat 2 positioned behind the seated person T. The pillar 8 is attached to the headrest attachment rod 10 in the left-right direction, and the left and right sides of the headrest attachment rod 10 are a pair of upper link rods. 15, the upper and lower intermediate portions of the upper link rod 15 are pivotally attached to the dorsal frame 3 of the dorsal seat 2 by a pivot shaft 16, and the upper link rod 15 is pivoted to the pivot shaft 16. The upper part is formed in the upper link arm part 22 and the lower part from the rotating shaft 16 is formed in the lower link arm part 23. The upper link arm part 22 is formed longer than the lower link arm part 23, and the lower link arm part is formed. 23 is below The upper part of the transmission member 20 that is moved downward by the rearward movement of the rear collision detector 25 is attached to the lower part of the lower link arm part 23, and the lower part of the transmission member 20 is located on the lower side. The rear impact sensor 25 is attached to the lower link 26, and the plate body 31 formed in a substantially rectangular single plate shape is attached to the back frame 3 of the back seat 2 with a wire spring 32. A plate-like support member 30 is provided which is attached to the back frame frame 3 so as to be freely movable back and forth, and allows the plate body 31 to move back and forth during normal running on the rear side of the plate body 31 and The rear collision detector 25 is disposed independently of the plate body 31 with a predetermined interval at which a collision can be detected, and the plate body 31 abuts on the rear collision sensor 25 and the rear collision detector 25 Move 25 backwards Configuration the vehicle seat so. 3. The plate body 31 of the plate-like support member 30 according to claim 1 or 2, wherein the plate body 31 is a substantially rectangular single plate shape and is elastically deformed with a predetermined strength capable of supporting the seated person T by a synthetic resin. The wire spring 32 has a predetermined elasticity and is configured so that the entire plate body 31 can move rearward while maintaining the surface shape. In claim 1 or claim 2 or claim 3, the wire spring 32 has two upper and lower wire springs 32A and 32B arranged side by side, and the upper wire spring 32A and the lower wire spring 32B. In each case, both left and right ends are fixedly attached to the dorsal frame 3 side, and an intermediate portion thereof is attached to the plate body 31. The plate body 31 is provided at four locations, upper, lower, left and right by an upper wire spring 32A and a lower wire spring 32B. The vehicle seat fixedly attached to the back frame 3 side. The upper edge of the plate body 31 is located above the vicinity of the ninth thoracic vertebra X of the average seated person T, and the upper side of the wire spring 32 according to claim 1, claim 2, claim 3, or claim 4. The wire spring 32A is a vehicle seat positioned behind the ninth thoracic vertebrae X. In claim 5, the upper side edge 35 of the upper portion 34 of the plate body 31 is formed in a substantially straight shape so that the upper portion 34 has substantially the same left and right width. The plate middle portion 36 has a plate middle portion 36 with its left and right side edges formed in the middle arc portion 37 so that the upper and lower middle portions of the plate middle portion 36 have the narrowest arc shape. A vehicle seat in which the rear collision detector 25 is disposed on the rear side of the intermediate portion. In Claim 6, the lower part 40 of the plate body 31 below the plate intermediate part 36 forms an iliac support part 41 projecting laterally on both the left and right sides, and the lower side below the iliac support part 41 is downward. Are formed in the lower arc portion 42 having a narrow arc shape, and a sacrum support portion 43 projecting downward is formed at the junction of the left and right lower arc portions 42, and the lower wire spring of the wire spring 32 is formed. 32B is a vehicle seat positioned on the rear side between the narrowest portion of the plate intermediate portion 36 and the iliac support portion 41.

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