JP2006117042A - Vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently ensure moving amount of a headrest, to prevent the breakage of a seating posture when detecting rear collision, and to adjust elastic force (force pressing forward) of a backrest seat according to a physique and preferences of a seating person. <P>SOLUTION: A rear collision sensing element 25 forwardly moving the headrest at the time of rear collision is provided in the backrest seat. To a backrest frame on a front side of the rear collision sensing element, a plate element 31 of a rectangular one plate shape for supporting cushion material is attached through a wire spring so as to move in a fore-and-aft direction. The plate element is formed to be divided into an upper side plate element 31A and a lower side plate element 31B. A plurality of projecting portions 41A, 41B and a fitting grooves is formed on the upper side plate element and the lower side plate element. The projecting portions and the fitting grooves are engaged with each other to form an adjusting portion 48 elastically deforming. An elastic force adjusting mechanism 40 capable of adjusting supporting elastic force of a body of the seating person by the adjusting portion is structured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is for a vehicle configured to support a seated person's head that moves backward due to inertia in response to a collision from behind (so-called “rear collision”) by moving the headrest forward rather than before the rear collision. It relates to the sheet.

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. There is (for example, Patent Document 1).
Also, a configuration is known in which a plurality of zigzag springs in the left-right direction are arranged side by side on a square frame-shaped dorsal seat frame, and a cushion material is positioned on the front surface of the zigzag spring (for example, Patent Document 2).
Conventionally, a configuration in which a frame body is provided instead of a zigzag spring and a part of the frame body moves back and forth is known (for example, Patent Document 3).
Also, the configuration of a lumbar support mechanism that adjusts the back and forth position of the cushion material of the back seat of the seated person's waist is known (for example, Patent Document 4).
JP-A-10-119619 Japanese Patent Laid-Open No. 4-8309 JP-A-11-206506 Japanese Patent Laid-Open No. 7-194461

Among the known examples described in JP-A-10-119619, the movable frame moves in the front-rear direction, so that the zigzag spring that supports the cushion material is not provided in the portion where the movable frame is provided. There is.
Similarly, since the configurations described in JP-A-11-206506 and JP-A-7-194461 are both configured to push the cushion material forward, the movement direction of the lumbar support pressed forward, and the whiplash As a result, the lumbar support mechanism and the whiplash countermeasure mechanism cannot be used in combination, opposite to the direction of movement of the rear collision detector that moves backward to detect the rear collision provided for the countermeasure against the illness.
That is, in the case of a dorsal fin seat provided with a mechanism for countermeasures against whiplash, it has been said that a spring configuration that improves cushion performance and a lumbar support mechanism that matches the physique of a seated person cannot be provided together.
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. A special contrivance is made so as not to break, and the elasticity (force to push forward) of the dorsal seat can be adjusted according to the physique and preference of the seated person.

In the present invention, the headrest 6 formed by providing the pillar 8 on the head support portion 7 that supports at least the seated person's head, the rear collision detector 25 in the dorsal seat 2 located near the waist of the seated person. Are connected to each other via a link mechanism, and the headrest 6 is moved forward by the rearward movement of the rear collision detector 25 to support the head of the seated person. A plate-like support member 30 comprising a plate body 31 that elastically supports the cushion material of the dorsal seat 2 is provided, and the plate body 31 is formed into a substantially rectangular single plate having elasticity, and a wire spring 32 is formed. And the plate body 31 is divided into an upper plate body 31A and a lower plate body 31B so as to be vertically movable, and the upper plate body 31A A plurality of protrusions 41A, 41B and fitting grooves 42A, 42B are alternately formed on the upper portion and the lower plate body 31B, respectively, and the protrusions 41A, 41B and the fitting grooves 42A, 42B mesh with each other to be elastic. An adjustable portion 48 that can be deformed is formed, and the elastic seat adjusting mechanism 40 that can adjust the supporting elasticity of the seated person's body is formed by the adjusting portion 48.
In the present invention, the elasticity adjusting mechanism 40 fixes a lower frame 49 in the left-right direction to the lower back surface of the lower plate body 31B, and the operation rod 50 is positioned at a middle position on the left and right sides of the lower frame 49. The lower end is attached, and the tip of the inner cable 53 of the wire cable 52 whose base is connected to the operating device is locked to the upper portion of the operation rod 50, and the tip of the outer tube 54 of the wire cable 52 is connected to the plate body 31. It is set as the vehicle seat latched by the upper side bending part 55 provided in the upper part.
In the present invention, the elasticity adjusting mechanism 40 has an engaging portion 43 formed at the tip of each of the projecting portions 41A and 41B, and the upper plate body 31A and the lower plate body at the back of the fitting grooves 42A and 42B. An engagement hole 44 is formed in each of 31B, the engagement portion 43 is engaged with the engagement hole 44, and the inner cable 53 is tensioned to connect the upper plate body 31A and the lower plate body 31B together. The vehicle seat is configured to be a sheet-like plate body 31.
In the present invention, the adjustment portion 48 of the elasticity adjusting mechanism 40 is a vehicle seat configured to be provided below the rear collision detector 25.

In the first aspect of the present 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, so that the seating posture is lost. Instead, the rear collision detector 25 detects the rear collision and moves the headrest 6 forward so that the head can be supported, and the front and rear positions of the plate body 31 are adjusted to suit the physique and preference of the seated person. The elasticity can be adjusted.
In the invention of claim 2, since the plate body 31 itself is formed in the adjusting portion 48 that elastically deforms, the cost is low, the cushion performance is improved as compared with the zigzag spring, and whiplash measures are taken and adjustment according to the seated person's physique. It is possible to realize and provide a vehicle seat in which the mechanism coexists.
In the invention of claim 3, the operation mechanism of the adjusting portion 48 can be provided without interfering with the whiplash countermeasure mechanism.
In the invention of claim 4, the adjusting portion 48 near the waist of the seated person can be moved back and forth, and fatigue at the time of sitting can be reduced.

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 periphery 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 of the seated person 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 11 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, it selectively selects to the engagement recessed part formed in the pillar 8 which located the engagement member provided in the pillar support member 11 in desired height. What is necessary is just to engage and hold | maintain.
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.
Thus, the back collision frame 3 is provided with a rear collision detector 25 that moves backward due to the backward movement of the seated person collided from behind. The rear impact detection body 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 due to the backward movement of the seated person, this energy causes the lower link 26 and the transmission member 20 to move. The upper link rod 15 moves the headrest 6 forward to support the seated person's head.

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 amount of movement of the rear collision detector 25 to move the headrest 6 forward, so that the amount of movement of the headrest 6 can be sufficiently secured and the head of the seated person is reliably supported. .
Thus, the members of the lower link 26 and the upper link rod 15 are formed in a plate shape, and are attached to the left and right side frames 17 of the dorsal frame 3, respectively. The rear collision detector 25 is only located between the two, and does not give the seated person an uncomfortable or uncomfortable feeling when 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 (upper body including the waist). The plate-like support member 30 supports the upper body of the seated person with a “surface”, stabilizes the sitting posture, and favorably supports the head by the headrest 6.
In other words, in the conventional zigzag spring configuration arranged vertically, the upper body of the seated person is supported by “line” by each zigzag spring that moves backward due to the 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 30 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 30 is formed by a substantially rectangular single plate-like plate body 31, and the plate body 31 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 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. Support the seated person 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 positioned above the vicinity of the average occupant's ninth thoracic vertebra. 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 (small amount of movement). By positioning the upper edge of the plate body 31 above the vicinity of the ninth thoracic vertebra The plate-like support member 30 supports the position of the center of gravity of the upper body of the seated person.

In this case, if the upper wire spring 32A of the wire spring 32 is positioned slightly below the vicinity of the ninth thoracic vertebra and supports the load applied obliquely rearward and downward from the vicinity of the ninth thoracic vertebra, the upper part of the seated person is further improved. It is preferable because it can effectively support the body.
Thus, the rear impact detection body 25 is positioned behind the upper and lower intermediate predetermined positions 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 upper and lower middle portions of the plate-like support member 30 have 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 If it is provided above, the plate-like support member 30 of that portion is moved backward by a predetermined amount, and the upper and lower intermediate portions of the plate body 31 are not supported for reasons such as insufficient support of the upper body of the seated person. The rear collision detector 25 is positioned rearward.
Therefore, both the support of the seated person by the plate-like support member 30 and the certainty of the detection of the rear collision by the rear collision detector 25 can be achieved.

Therefore, the plate body 31 of the plate-shaped support member 30 is divided into upper and lower plate bodies 31A and 31B and formed vertically. Between the lower part of the upper plate body 31A and the upper part of the lower plate body 31B, an elasticity adjusting mechanism 40 capable of adjusting the support elasticity (pressure) of the seated person's body is provided.
Protrusions 41A and 41B, fitting grooves 42A and fitting grooves 42B are alternately formed on the lower part of the upper plate body 31A and the upper part of the lower plate body 31B like comb teeth, and the projecting parts 41A and 41B are formed. The fitting grooves 42A and 42B are formed to have substantially the same width and are fitted so that the gears mesh with each other, so that the upper plate body 31A and the lower plate body 31B are formed into a single plate body 31.
An engaging portion 43 is formed at the tip of each projecting portion 41A, 41B, and an engaging hole 44 is formed in the plate body 31 at the back of the groove of the fitting grooves 42A, 42B to engage the engaging portion 43. The upper plate body 31 </ b> A and the lower plate body 31 </ b> B are made into a single plate body 31 by engaging with the holes 44.
And the part which protrusion part 41A, 41B and fitting groove 42A, 42B meshed mutually is formed in the adjustment part 48 which goes in and out.

Accordingly, the lower frame 49 is provided in a fixed state below the lower plate body 31B. The lower frame 49 is formed in a left-right axial rod shape, and the lower portion of the operation rod 50 is attached to the middle position of the lower frame 49 in the left-right direction. The upper and lower intermediate portions of the operation rod 50 are inserted into a guide member 51 provided on the upper plate body 31A. The guide member 51 guides the vertical movement of the operation rod 50. The guide member 51 is fixed to the back surface of the upper plate body 31 </ b> A, and the cable tip 53 </ b> A of the inner cable 53 of the wire cable 52 is locked to the operation rod 50 protruding upward from the guide member 51.
The distal end of the outer tube (cable sheath) 54 of the wire cable 52 is locked to an upper bent portion 55 provided on the upper portion of the plate body 31, and the base portion of the wire cable 52 is an operating device (not shown) provided at an arbitrary location. Connect to.
When the wire cable 52 pulls the inner cable 53, the inner cable 53 pulls the operation rod 50, and the operation rod 50 pulls the lower frame 49 upward so that the distance between the upper end and the lower end of the plate body 31 is increased. shorten.

In this case, since the adjustment portion 48 of the plate body 31 is formed by the protruding portions 41A and 41B and the fitting grooves 42A and 42B, the cross-sectional area is reduced compared to the portions of the other plate bodies 31, When the plate body 31 is bent, the adjusting portion 48 is elastically deformed and protrudes forward.
That is, when the lower frame 49 is pulled upward, the distance between the upper end and the lower end of the plate body 31 is shortened, and the upper and lower intermediate portions of the adjusting portion 48 are elastically deformed to compete forward, and the seated person is moved forward. Increase the pressure applied to.
On the other hand, when the inner cable 53 is loosened, the distance between the upper end and the lower end of the plate body 31 is increased, and the upper and lower intermediate portions of the adjustment portion 48 are moved backward to weaken the pressure for pushing the seated person forward.
Accordingly, the plate body 31 does not push the entire plate body 31 forward, but instead flexes and moves the adjustment portion 48 engaging the protrusions 41A and 41B and the fitting grooves 42A and 42B to move the seated person forward. Adjust the pressure to press.
If the adjustment part 48 is provided in the vicinity of the so-called iliac of the seated person, it is preferable because it can reduce the tiredness of the waist part of the seated person or can adjust the pressure of the waist part where the body shape of the seated person is large.

(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 the left and right sides of the headrest mounting rod 10 are fixed to the upper part of the upper link rod 15, respectively. It is attached to the side frame 17 by the rotating shaft 16, the upper part of the transmission member 20 is attached to the lower end part of the upper link rod 15, and the lower part of the transmission member 20 is vertically middle of the lower link 26 attached to the side frame 17. Since the left and right sides of the rear collision detector 25 are attached to the lower part of the lower link 26 in a connected state, when the seated person moves rearward due to an impact from the rear, the rear collision detector 25 is moved rearward, and the lower link 26 is rotated by the rearward movement of the rear collision detector 25 to pull the transmission member 20 downward. The transmission member 20 rotates the upper link rod 15 downward about the rotation shaft 16. Movement So, the upper portion of the upper link rod 15 is rotated forward in the rotation shaft 16 around which the headrest 6 moves forward to the shaft 21 the center.
Accordingly, the headrest 6 is rotated forward by the upper link rod 15 to support the head, 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, so that the amount of movement can be sufficiently secured and the seated person's head is reliably supported.
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 moving direction (rearward) of the seated person who receives an impact from the rear. It is the same as (moving) and does not prevent the seated person from moving backward.

That is, if the operating direction of the lower link arm portion 23 is set to the front side, it will be contrary to the moving direction (backward movement) of the seated person, and the seated person will be prevented from moving rearward and will not operate effectively.
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 operation direction coincides with the movement direction (rearward movement) of the seated person. Further, interference from the skin member 5 is avoided and the operation is ensured.

Therefore, the operating mechanism of the upper link rod 15, the transmission member 20, and the lower link 26 is such that the operating direction is the rear direction even if the cushion material 4 and the skin member 5 are present on the front side. Pressure interference by the skin member 5 can be avoided, and loss can be eliminated as much as possible when the movement of the rear collision detector 25 is transmitted to the headrest 6, thereby ensuring 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.
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”.
That is, in the zigzag spring supported by the “line”, even if the head is supported by the headrest 6 that moves forward at the time of a rear collision, the support of the upper body of the seated person becomes unstable and the positional relationship between the head and the upper body However, in the present application, since the entire upper body of the seated person is supported by the “plane” by the plate-like support member 30, the head and the seated person's head are coupled with the headrest 6 that moves forward. The upper body can be supported well, and the sitting posture of the seated person including the head 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.
In this case, the plate body 31 is attached to the dorsal frame 3 via the wire spring 32 so as to be movable back and forth. Therefore, even when the plate body 31 moves back and forth due to the load of the seated person, the rear collision detection is performed. It does not come into contact with the body 25 and does not hinder cushioning. In addition, when the seated person moves backward due to inertia after receiving an impact from the rear, the plate body 31 moves rearward, and the rear collision detector 25 moves rearward due to the rearward movement of the plate body 31. The movement direction of the rear collision detector 25 is the same, and the positional relationship between the entire plate body 31 and the rear collision detector 25 with respect to the dorsal frame 3 does not change.
Accordingly, the plate body 31 and the rear collision detection body 25 do not interfere with each other, and both the support of the seated person by the plate-like support member 30 and the certainty of the detection of the rear collision by the rear collision detection body 25 are achieved. Is a rational structure.

Thus, the plate body 31 of the plate-like support member 30 is divided into an upper plate body 31A and a lower plate body 31B so as to be vertically divided between the lower part of the upper plate body 31A and the upper part of the lower plate body 31B. Is provided with a resilience adjusting mechanism 40 that can adjust the support resilience (pressure) of the body of the seated person, so that the strength of the pressure pushing the seated person forward can be adjusted by moving the adjusting part 48 of the resilience adjusting mechanism 40 back and forth. .
The adjustment part 48 forms protrusions 41A, 41B and fitting grooves 42A, 42B alternately like a comb tooth on the lower part of the upper plate body 31A and the upper part of the lower plate body 31B, respectively. 41B and the fitting grooves 42A and 42B are engaged with each other, and engaging portions 43 are formed at the tips of the protruding portions 41A and 41B, and the plate body 31 at the back of the grooves of the fitting grooves 42A and 42B. Since the engagement holes 44 are formed, the engagement portion 43 is engaged with the engagement holes 44, and the operation rod 50 is slightly pulled by the inner cable 53 of the wire cable 52 to adjust. The part 48 is bent so as to protrude slightly forward, and the assembly is completed, and the engagement state between the engagement part 43 and the engagement hole 44 is maintained.
When a seated person sits in this state, the upper plate body 31A and the lower plate body 31B become a single plate body 31, and the plate body 31 acts as described above and exhibits good cushion performance.

Thus, the lower frame 49 is fixed to the lower part of the lower plate body 31B, the lower part of the operation rod 50 is attached to the lower frame 49, and the operation rod 50 protruding upward from the guide member 51 is connected to the wire. Since the cable tip 53A of the inner cable 53 of the cable 52 is locked, when the inner cable 53 is pulled, the tip of the outer tube 54 of the wire cable 52 is locked to the upper bent portion 55 on the upper portion of the plate body 31. Therefore, the pulled inner cable 53 pulls the operation rod 50 upward, and the operation rod 50 pulls the lower frame 49 upward.
Therefore, the distance between the upper end and the lower end of the plate body 31 is pulled by the inner cable 53 being pulled.
When the distance between the upper end and the lower end of the plate body 31 is shortened, stress concentrates on the adjustment portion 48 that is an engagement portion of the protrusions 41A and 41B provided on the lower portion of the upper plate body 31A and the upper portion of the lower plate body 31B. Therefore, the adjustment part 48 is elastically deformed and protrudes to the front side to increase the pressure for pushing the seated person forward.

On the other hand, when the inner cable 53 is loosened, the distance between the upper end and the lower end of the plate body 31 becomes longer, the adjusting portion 48 is elastically restored, and the upper and lower intermediate portions of the adjusting portion 48 are retracted to the rear side. Decrease the pressure pushing forward.
In this case, the plate body 31 forms the adjusting portion 48 by engaging the protruding portions 41A and 41B at predetermined positions in the upper and lower intermediate portions. Therefore, the adjusting portion 48 does not push the whole forward, but the adjusting portion 48. The pressure which pushes forward the seated person of the part which meshed | engaged protrusion part 41A, 41B of this can be adjusted.
If the adjustment part 48 is provided in the vicinity of the so-called iliac of the seated person, it is preferable because it can reduce the tiredness of the waist part of the seated person or can adjust the pressure of the waist part where the body shape of the seated person is large.

Thus, since the elasticity adjusting mechanism 40 is configured to move the adjusting portion 48, which is a predetermined portion of the plate body 31, forward, the positional relationship between the entire plate body 31 and the rear collision detector 25 with respect to the dorsal frame 3. Will not change.
For this reason, since the positional relationship between the entire plate body 31 and the rear collision detection body 25 with respect to the dorsal frame 3 does not change, the presence of the elasticity adjusting mechanism 40 is the original of the whiplash countermeasure mechanism including the rear collision detection body 25 and the plate body 31. Does not affect the effects of
Therefore, it is possible to provide a resilience adjusting mechanism 40 that can adjust the resilience of the cushion, even though the vehicle seat 1 is provided with a whiplash countermeasure mechanism that can move the headrest 6 forward in the rear impact by the rear impact detector 25 and the link mechanism. It becomes.
Further, the elasticity adjusting mechanism 40 is configured only by providing the operating rod 50 and the inner cable 53 of the wire cable 52 on the back side of the plate body 31 (adjusting portion 48). The presence of the wire cable 52 does not affect the rearward movement of the plate body 31 and the rear collision detector 25 at all.
Therefore, the elasticity adjusting mechanism 40 does not affect the certainty of the cushioning property of the plate body 31 and the certainty of detection of the rear impact of the rear impact detector 25, and the front of the plate body 31 depending on the body shape and preference of the seated person. The pushing force can be adjusted, resulting in a rational configuration.

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. The exploded view of a plate-shaped support material. Assembly drawing of plate-like support material. The back perspective view of a plate-shaped support material. The assembly state enlarged view of a plate-shaped support material. The cross-sectional enlarged view of an adjustment part. The schematic side view of the transition state of the forward movement of an adjustment part.

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, 40 ... Elasticity adjusting mechanism, 41A, 41B ... Projection, 42A, 42B ... fitting groove, 43 ... engaging portion, 44 ... engaging hole, 48 ... adjusting portion, 49 ... lower frame, 50 ... operating rod, 51 ... guide member, 52 ... wire cable, 53 ... inner cable, 54. Outer tube, 5 ... upper bend.

Claims (4)

A headrest 6 formed by providing a pillar 8 on a head support 7 that supports at least the head of the seated person is provided with a rear collision sensor 25 and a link mechanism in the dorsal seat 2 located in the back of the seater's waist. And the headrest 6 is moved forward by the rearward movement of the rear collision detection body 25 to support the seated person's head. A plate-like support member 30 comprising a plate body 31 that elastically supports the two cushion members is provided. The plate body 31 is formed in a substantially rectangular single plate shape having elasticity, and the back member is interposed via a wire spring 32. The plate body 31 is attached to the back frame 3 of the heel seat 2 so as to be movable back and forth, and the plate body 31 is vertically divided into an upper plate body 31A and a lower plate body 31B, and a lower portion of the upper plate body 31A and A plurality of protrusions 41A, 41B and fitting grooves 42A, 42B are alternately formed on the upper portion of the side plate body 31B, and the protrusions 41A, 41B and the fitting grooves 42A, 42B can mesh with each other and be elastically deformed. The vehicle seat which formed the adjustment part 48, and comprised the elasticity adjustment mechanism 40 which can adjust the support elasticity of a seated person's body by this adjustment part 48. In claim 1, the elasticity adjusting mechanism 40 fixes a lower frame 49 in the left-right direction to the lower back surface of the lower plate body 31 </ b> B, and an operation rod 50 at a middle position between the lower frame 49. The tip of the inner cable 53 of the wire cable 52 whose base is connected to the operating device is locked to the top of the operating rod 50, and the tip of the outer tube 54 of the wire cable 52 is connected to the plate body. A vehicle seat that is locked to an upper bent portion 55 provided on an upper portion of the vehicle 31. 3. The elasticity adjusting mechanism 40 according to claim 2, wherein an engaging portion 43 is formed at the tip of each of the projecting portions 41A, 41B, and the upper plate body 31A and the lower plate at the back of the fitting grooves 42A, 42B. The body 31B is formed with an engagement hole 44, the engagement portion 43 is engaged with the engagement hole 44, and the inner cable 53 is tensioned to connect the upper plate body 31A and the lower plate body 31B. A vehicle seat configured to be a single plate body 31. 4. The vehicle seat according to claim 3, wherein the adjusting portion 48 of the elasticity adjusting mechanism 40 is provided below the rear collision detector 25.

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