JP2007331724A - Seat for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the shortage of the forward protrusion amount of an elasticity adjusting plate associated with the rigidity of a plate body. <P>SOLUTION: A back rest frame 3 is provided with a plate body 31 in a solid plate shape freely to move forward and backward through a wire spring 32. The front face of the plate body 31 is installed with the elasticity adjusting plate 40 made of synthetic resin in a solid plate shape that moves forward and backward. A lower opening portion 60 for engagement with the lower engagement portion 55 of the elasticity adjusting plate 40 is formed on the lower portion of the plate body 31. A fitting flute 55A formed longer than the lateral width of a cable front end engagement body 61 is provided on the surface side of the lower engagement portion 55 of the elasticity adjusting plate 40, thereby forming a cable insertion flute 58 for inserting the inner cable 57 of a wire cable 56 into the fitting flute 55A positioned on either of a right or left side. Also this seat for a vehicle is equipped with a stopping body 55B for engaging the cable front end engagement body 61 of the inner cable 57 inside the fitting flute 55A near the cable insertion flute 58. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a vehicle seat, and is particularly devised for the support structure of the cushion material of the backrest seat.

Conventionally, a single plate-shaped plate body made of synthetic resin capable of supporting the back of a seated person is attached to the dorsal frame of the dorsal seat so as to be movable back and forth with respect to the dorsal frame via a wire spring, On the front surface of the plate body is provided a single-plate elastic adjustment plate made of synthetic resin having elasticity so as to move back and forth with respect to the plate body, and the elasticity of the seated person's body is adjusted by the elasticity adjustment plate. The structure which can be obtained is well-known (for example, patent document 1).
JP 2006-122297 A

In the above-mentioned known example, since the attachment of the wire cable that bends the elasticity adjusting plate is performed while the elasticity adjusting plate is bent, it is necessary to simultaneously proceed the two operations of bending the elasticity adjusting plate and attaching the wire cable. There is a problem that it is very troublesome.
That is, when bending the elasticity adjusting plate because of the order of locking the cable tip engaging body of the wire cable to the upper back of the plate body and locking the tube tip of the outer tube to the lower engaging portion of the elasticity adjusting plate, The lower part of the elasticity adjustment plate moves upward, the tube tip of the outer tube must be pulled downward, the movement direction of the lower part of the elasticity adjustment plate and the outer tube is upside down, and the curvature of the elasticity adjustment plate, It was very troublesome because the two operations of attaching the tube tip of the outer tube were moved.
The present application facilitates the installation of a wire cable for operating the elasticity adjusting plate.

In the present invention, a single plate-shaped plate body 31 made of synthetic resin capable of supporting the back of a seated person is attached to the dorsal frame 3 of the dorsal seat 2 with respect to the dorsal frame 3 via a wire spring 32. The plate body 31 is provided with a single-plate elastic adjustment plate 40 made of synthetic resin having elasticity so as to move forward and backward with respect to the plate body 31, and the elasticity adjustment plate. 40, the support elasticity of the body of the seated person can be adjusted, and a lower opening 60 is formed in the lower part of the plate body 31 to engage with the lower engagement part 55 of the elasticity adjustment plate 40, and the elasticity On the surface side of the lower engagement portion 55 of the adjustment plate 40, a fitting groove 55A formed longer than the left and right widths of the cable tip engagement body 61 is provided, and the wire is connected to the fitting groove 55A at a position close to either the left or right side. cable A cable insertion groove 58 through which the inner cable 57 of the inner cable 57 is inserted is formed, and a retaining body 55B is provided in the fitting groove 55A in the vicinity of the cable insertion groove 58 to engage the cable tip engagement body 61 of the inner cable 57. This is a vehicle seat.
The present invention relates to a vehicle seat provided with a tube locking portion 65 in which the tube tip 63 of the outer tube 62 of the wire cable 56 is engaged and locked from above at a predetermined position on the back surface of the plate body 31. It is a thing.
In the present invention, an engagement portion that engages with an engagement hole formed in the plate body 31 is formed at an upper predetermined position of the elasticity adjusting plate 40, and the plate is formed at a lower predetermined position of the elasticity adjusting plate 40. A lower engaging portion 55 that engages with the lower opening 60 formed in the body 31 so as to freely move up and down is formed, and the elasticity adjustment of the elasticity adjusting plate 40 is performed on the lower engaging portion 55 engaged with the lower opening 60. The end of the inner cable 57 of the wire cable 56 is locked, and the lower part of the elasticity adjusting plate 40 is attached to the plate body 31 by the tension of the wire cable 56 to be a vehicle seat.
In the present invention, a single plate-shaped plate body 31 made of synthetic resin capable of supporting the back of a seated person is attached to the dorsal frame 3 of the dorsal seat 2 with respect to the dorsal frame 3 via a wire spring 32. The plate body 31 is attached to the front surface of the plate body 31 and a single-plate elastic adjustment plate 40 made of a synthetic resin having elasticity so as to move back and forth with respect to the plate body 31 is positioned. 40, the cable tip engagement body 61 of the wire cable 56 is fitted to either the left or right side of the fitting groove 55A on the surface side of the lower engagement portion 55, and the cable tip engagement body 61 is the other in the fitting groove 55A. Next, the inner cable 57 is engaged from the front side of the lower engaging portion 55 with the cable tip engaging body 61 fitted in the fitting groove 55A. The wire cable 56 is attached to the back side of the plate body 31 by moving the inner cable 57 from the lower opening 60 to the back side of the plate body 31 while moving in the cable insertion groove 58, and the elasticity adjusting plate 40. The lower engaging portion 55 is a method for assembling a vehicle seat to be engaged with the lower opening 60 below the plate body 31.
In the present invention, the wire cable 56 positioned on the back side of the plate body 31 from the front side of the plate body 31 through the lower opening 60 pulls the tube tip 63 of the outer tube 62 upward. The vehicle seat assembly method is such that the elasticity adjusting plate 40 is temporarily positioned above the tube locking portion 65 of the plate body 31 while being bent, and then the tube tip 63 is fitted to the tube locking portion 65 from above. Is.
In the present invention, the elasticity adjusting plate 40 is configured so that the upper engaging portion of the elasticity adjusting plate 40 is engaged with the engaging hole formed in the plate body 31. The cable tip engaging body 61 of the wire cable 56 is fitted and locked in the fitting groove 55A on the front surface side of 55, and then the wire cable 56 in which the cable tip engaging body 61 is fitted in the fitting groove 55A is an inner cable 57. Is moved in the cable insertion groove 58 from the front side of the lower engaging portion 55 and moved to the back side of the plate body 31 through the lower opening 60, and then the tube tip 63 of the outer tube 62 of the wire cable 56 is moved to the outer side. The tube 62 is pulled upward to bend the elasticity adjusting plate 40 while being fitted to the tube locking portion 65 from above, and the wire cable 56 is tensioned. In in which the lower portion of the elastic regulating plate 40 was set to assembling method of the vehicle seat to be engaged with and held by the lower opening 60.

According to the first aspect of the present invention, when the inner cable 57 of the wire cable 56 is attached, the cable tip engagement body 61 is not detached by the retaining body 55B when the cable tip engagement body 61 is fitted in the fitting groove 55A. Can be easily installed, and the assembly of the vehicle seat can be facilitated.
In the invention of claim 2, since the tube tip 63 of the outer tube 62 of the wire cable 56 is engaged with the tube locking portion 65 from above, the elastic adjustment plate 40 can be bent and the outer tube 62 can be attached at the same time. Therefore, it is possible to easily perform the operation of rolling, and to easily assemble the vehicle seat.
In the invention of claim 3, since the lower part of the elasticity adjusting plate 40 is attached to the plate body 31 by the tension of the wire cable 56, the number of parts can be reduced and the assembly of the vehicle seat can be facilitated.
In the invention of claim 4, since the attachment is not completed by simply fitting the cable tip engagement body 61 of the wire cable 56 into the fitting groove 55 </ b> A and sliding it sideways, the wire cable 56 is moved to the back side of the plate body 31. The vehicle seat can be easily moved and the assembly of the vehicle seat can be facilitated.
In the fifth aspect of the invention, since the tube tip 63 of the outer tube 62 of the wire cable 56 is engaged with the tube locking portion 65 from above, the elastic adjustment plate 40 can be bent and the outer tube 62 can be attached at the same time. Therefore, it is possible to easily perform the operation of rolling, and to easily assemble the vehicle seat.
According to the sixth aspect of the present invention, it is possible to facilitate the entire mounting operation of the elasticity adjusting plate 40 and the wire cable 56, and the assembly of the vehicle seat can be facilitated.

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 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 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 part of the lower link 26 by a shaft 29.
When the rear collision detector 25 moves backward due to the backward movement of the seated person, this energy is transmitted to the upper link rod 15 via the lower link 26 and the transmission member 20, and the upper link rod 15 is transmitted to the rear of the seated person. The headrest 6 is moved forward by the moving energy 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, each member of the lower link 26 and the upper link rod 15 is formed in a plate shape parallel to the left and right side frames 17 of the back frame 3 and is attached to the side frame 17. The rear impact detector 25 is only positioned between the left and right side frames 17 and does not give the seated person a sense of discomfort or discomfort when seated.

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 makes the headrest 6 support well.
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, but in this application, the headrest 6 moved forward is When the head is supported, the plate-like support member 30 supports the entire upper body of the seated person with a “surface”, so that the sitting posture of the seated person including the head is extremely stabilized.

The plate-like support member 30 is formed by a single plate-like plate body 31, and the plate body 31 is made of a synthetic resin such as polypropylene and has a predetermined strength capable of supporting a seated person.
The plate body 31 is formed in a substantially pentagonal shape like a baseball base, and flanges 33 are formed on the left and right sides of the plate body 31 so as to protrude forward or backward. The flange 33 improves the rigidity of the plate body 31 and prevents deformation due to an input load at the time of sitting. In the embodiment, the flange 33 is formed so as to protrude rearward.
Further, the flange 33 is expected to have an effect of preventing the plate body 31 from warping when the plate body 31 is formed.
The flange 33 is formed so that the vicinity of the push-out surface portion 70 of the elasticity adjusting plate 40, which will be described later, protrudes forward or backward to form the highest top portion 34, and is inclined so that the upper and lower sides of the top portion 34 become lower as it goes upward or downward. To form the inclined surface 35.

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.
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 its surface shape.
A pair of upper and lower wire springs 32 are provided. The wire spring 32 is formed by a single shaft member, and both left and right ends of the wire spring 32 protrude sideward from the left and right edges of the plate body 31, and an intermediate portion of the wire spring 32 is attached to the back side of the plate body 31.

The upper wire spring 32 </ b> A of the wire springs 32 is attached to the back side near the upper edge of the plate body 31. The upper wire spring 32A forms a bent portion 37 that matches the opening 36, the bent portion 37 is fitted into the opening 36, an engagement piece 38 is provided in the opening 36, and the engagement piece 38 is bent. 37 is attached by engaging.
That is, the engagement piece 38 is formed in the opening 36, and the bent portion 37 of the upper wire spring 32A is engaged with the surface of the engagement piece 38 from the back surface of the plate body 31, thereby the plate body 31 and the upper wire spring. The thickness before and after 32A can be made thin.
Further, the lower wire spring 32 </ b> B in the wire spring 32 is attached to a predetermined position between the upper and lower sides of the plate body 31.

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.
Thus, an elastic adjustment plate 40 that moves back and forth with respect to the plate body 31 is provided on the front side (front side) of the plate body 31 of the plate-like support member 30.
The elasticity adjusting plate 40 is formed in a single plate shape made of synthetic resin having elasticity. A plurality of rearward projecting engaging portions 41 and / or forward projecting engaging portions 42 protruding rearward are arranged in parallel in the left-right direction at predetermined positions on the rear surface of the elastic adjustment plate 40. The upper projecting portion rear projecting engaging portion 41 and the front projecting engaging portion 42 are engaged with an upper engaging hole 43 and a lower engaging hole 44 formed in the plate body 31.

The rear protruding engagement portion 41 is formed by forming a rear bulge portion 45 on the upper side and providing a downward arc engagement surface 46 on the lower surface of the rear bulge portion 45. The downward arc engagement surface 46 engages with the lower arc surface 47 on the lower surface in the upper engagement hole 43. The front projecting engagement portion 42 forms a front bulging portion 50 that bulges rearward from the downward arc engaging surface 46 of the rear projecting engagement portion 41, and an upward arc engaging surface 51 on the lower surface of the front bulging portion 50. Is formed. The upward arc engagement surface 51 engages with the upper arc surface 52 on the upper surface in the lower engagement hole 44.
In this case, the lower arc surface 47 of the upper engagement hole 43 and the upper arc surface 52 of the lower engagement hole 44 are arc surfaces that substantially coincide with a concentric circle having a center G provided at a predetermined position in a side view. The elastic adjustment plate 40 is rotated about the center G as an axis after the rear projecting engagement portion 41 and the front projecting engagement portion 42 are inserted and engaged in the upper engagement hole 43 and the lower engagement hole 44. The configuration is as follows.

That is, the upper part of the elasticity adjusting plate 40 is inserted into the upper engagement hole 43 and the lower engagement hole 44 of the plate body 31 from the front side and the rear protrusion engagement part 41 and the front protrusion engagement part 42 from the front side. The elasticity adjusting plate 40 is rotated downward with the center G as an axis while the protruding engagement part 41 and the front protruding engagement part 42 are engaged, and the elasticity adjusting plate 40 is attached so as to overlap the front surface of the plate body 31.
A lower protrusion 55 protruding slightly rearward is formed at a predetermined position below the elasticity adjusting plate 40. A cable insertion groove 58 for inserting the inner cable 57 of the wire cable 56 is formed in the lower protrusion 55.

The lower projecting portion 55 is fitted so as to project to the rear side of the plate body 31 from the lower opening 60 provided at the lower portion of the plate body 31, and the cable of the lower engaging portion 55 projecting to the rear side of the plate body 31. The distal end of the inner cable 57 is fitted into the insertion groove 58, and the cable distal end engaging body 61 at the distal end of the inner cable 57 is engaged with and engaged with the fitting groove 55 </ b> A of the lower engaging portion 55.
The fitting groove 55A is formed on the lower surface side of the elasticity adjusting plate 40 so as to be longer than the left and right widths of the cable tip engaging body 61. The cable insertion groove 58 is formed on one side of the fitting groove 55A and the retaining member 55B is provided. . The cable tip engaging body 61 is fitted to the other side of the fitting groove fitting groove 55A, the inner cable 57 is held, the cable tip engaging body 61 is slid sideways in the fitting groove 55A, and the cable retaining member 55B is connected to the cable. The tip engagement body 61 is configured to contact and not come out.

Thus, the lower engaging portion 55 and the lower opening 60 are formed to have substantially the same lateral width, and the side edges of the lower engaging portion 55 are moved up and down while sliding on the inner periphery of the lower opening 60. If comprised, the lower engaging part 55 and the lower side opening part 60 will act like a guide mutually, and the elasticity adjustment effect | action of the elasticity adjustment plate 40 can be performed smoothly and reliably, and it is suitable.
The lower opening 60 is opened with a predetermined length that allows the lower engagement portion 55 to move up and down because the elasticity adjusting plate 40 is bent.
A tube locking portion 65 that locks the tube tip 63 of the outer tube 62 of the wire cable 56 is provided at the left and right center position of the plate body 31. The tube locking portion 65 may be formed in a concave shape so that part or all of the tube tip 63 is buried in the front and rear width of the plate body 31.

In the tube locking portion 65 of the embodiment, an upper recess 67 is formed in the plate body 31, a pair of arm portions 66 are provided on the left and right edges of the upper recess 67, and the tube tip is formed by the upper recess 67 and the left and right arm portions 66. A recessed space in which 63 is buried is formed, and the tube tip 63 is fitted into the upper recessed portion 67.
In this case, in the wire cable 56, the cable tip engagement body 61 of the inner cable 57 is fitted to the other side of the fitting groove 55A, and the cable tip engagement body 61 is slid sideways in the fitting groove 55A. When the combined body 61 is fitted into the retaining body 55B, the inner cable 57 is aligned with the cable insertion groove 58. Therefore, the inner cable 57 is rotated together with the wire cable 56 while the cable end engaging body 61 is fitted in the fitting groove 55A. Then, the wire cable 56 is moved through the back side from the lower opening 60, and then the outer tube 62 is pulled upward to fit the tube tip 63 from above the tube locking portion 65. Complete.

A fitting groove 68 that is recessed forward is formed in the plate body 31 between the tube locking portion 65 and the lower engaging portion 55, and the inner cable 57 is fitted into the fitting groove 68.
Further, if a tube locking portion 65A is separately provided at a predetermined position above the tube locking portion 65 and the intermediate portion of the outer tube 62 is locked, the wire cable 56 does not leave the plate body 31, and management such as carrying is possible. It is easy and suitable.
When the wire cable 56 pulls the inner cable 57, the cable tip engagement body 61 of the inner cable 57 pulls the lower engagement portion 55 of the elasticity adjusting plate 40 upward. As a result, the upper edge of the elasticity adjusting plate 40 and elasticity The distance between the lower engaging portions 55 of the adjustment plate 40 is shortened, and the elasticity adjustment plate 40 is pushed forward.
Thus, the predetermined portion of the elasticity adjusting plate 40 is formed on the pushing surface portion 70 that protrudes forward when the interval between the upper edge side (engagement portion 41) and the lower edge side (lower engagement portion 55) of the elasticity adjustment plate 40 is narrowed. The elasticity adjustment plate 40 in the vicinity of the push-out surface portion 70 is moved back and forth to adjust the support elasticity of the body of the seated person of the elasticity adjustment plate 40.

That is, even if the elasticity adjusting plate 40 is simply bent up and down, if the portion that moves forward fluctuates up and down, the seating feeling is impaired. Therefore, the extrusion surface portion 70 is provided in advance so that the predetermined portion is curved forward.
The extrusion surface portion 70 is configured by forming a notch portion 71 on the left and right side edges of the elasticity adjusting plate 40 at a portion that becomes the extrusion surface portion 70. You may provide the notch part 71 in a pair on the right-and-left side edge of the extrusion surface part 70, or two or more up and down.
That is, when the notch 71 is provided in the elasticity adjusting plate 40 of the extruded surface portion 70, the notch 71 becomes a bending point due to concentration of stress by reducing the cross-sectional area of the elasticity adjusting plate 40. Curved to 71 center.
Further, when at least one or more upper cutout portions 72 are provided on the side edges of the elasticity adjusting plate 40 other than the extrusion surface portion 70, the upper portion of the elasticity adjusting plate 40 can be curved into a desired shape.

That is, when the stress concentrates on the notch 71 and the upper notch 72 and becomes a bending point, the concentrated stress acts so as to cause the elasticity adjusting plate 40 to protrude forward. The elastic adjustment plate 40 at the upper notch 72 is projected forward by the input load at the time, and the seated person's state is favorably supported.
In this case, the position of the push-out surface portion 70 is below the middle of the upper and lower portions of the rearward projecting engagement portion 41 and the lower engagement portion 55 of the elasticity adjusting plate 40, and the distance between the rearward projecting engagement portion 41 and the push-out surface portion 70. The distance L between the extrusion surface portion 70 and the lower engagement portion 55 is configured to be shorter than K.
That is, the elasticity adjusting plate 40 moves the lower engagement portion 55 upward to move the extrusion surface portion 70 forward, and also engages the extrusion surface portion 70 and the lower engagement portion more than the distance K between the rearward projecting engagement portion 41 and the extrusion surface portion 70. By configuring so that the distance L to the portion 55 is shorter, the moving radius when the extruded surface portion 70 moves around the upper edge of the elasticity adjusting plate 40 as a fulcrum is made as long as possible, and the elasticity adjusting plate The fluctuation of the vertical position at the time of forward and backward movement of the extrusion surface portion 70 due to the bending of 40 is suppressed.

  In other words, when the lower end of the elasticity adjusting plate 40 is fixed and the upper end of the elasticity adjusting plate 40 is lowered, the pushing surface portion 70 is pushed forward while lowering the lower end of the elasticity adjusting plate 40 as a fulcrum. Although the vertical movement distance of 70 is increased, in the present application, the elasticity adjustment plate is moved by moving the lower engagement portion 55 of the elasticity adjustment plate 40 upward with the rearward projecting engagement portion 41 at the upper end of the elasticity adjustment plate 40 in a fixed position. Since 40 is bent, the amount of displacement in the vertical direction when the extrusion surface portion 70 moves back and forth is suppressed as much as possible.

(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 both 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 cushion material 4 Pushing backward, the cushion material 4 pushes the plate body 31 backward, the plate body 31 moves the rear collision detector 25 backward, and the lower link 26 rotates by the rear movement of the rear collision detector 25. Then, the transmission member 20 is pulled downward, the transmission member 20 rotates the upper link rod 15 downward about the rotation shaft 16, and the upper portion of the upper link rod 15 rotates forward about the rotation shaft 16. As a result, the headrest 6 moves forward about the axis 21.

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.

Therefore, if the lower part of the plate body 31 is positioned near the sacrum of the seated person, the vicinity of the waist of the seated person can be reliably held, which is preferable.
In addition, since the plate body 31 is attached to the dorsal frame 3 so as to be movable back and forth, and the direction of movement due to inertia is the same for both the plate body 31 and the rear collision detector 25, there is no situation where they interfere with each other in the relationship between 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 made compatible, and a rational configuration is obtained.
Each member of the lower link 26 and the upper link rod 15 is formed in a plate shape parallel to the left and right side frames 17 of the back frame 3 and is attached to the side frame 17. The rear collision detector 25 can be provided so as not to interfere with the back-and-forth movement of the rear collision detector 25, and in this respect as well, the configuration is rational.

  Thus, the elasticity adjusting plate 40 is provided on the front side of the plate body 31 of the plate-shaped support member 30, and the upper part of the elasticity adjusting plate 40 is engaged with the plate body 31, and the lower part of the lower part of the elasticity adjusting plate 40 is engaged. Since the joint portion 55 is fitted to the lower opening 60 so as to be movable up and down, when the lower engagement portion 55 is pulled upward by the cable 57, the distance between the upper edge and the lower edge of the elasticity adjusting plate 40. If the distance between the upper edge and the lower edge of the elasticity adjusting plate 40 is increased, the elasticity of the elastic adjustment plate 40 is increased. The upper and lower middle portions of the adjustment plate 40 are retracted rearward to weaken the pressure to push the seated person forward, and change and adjust the elasticity of the seated person according to the physique and preference.

That is, the elasticity adjusting plate 40 is provided on the front side of the plate body 31, and the distance between the upper edge and the lower edge of the elasticity adjusting plate 40 is changed to be longer or shorter by the wire cable 56 provided on the back side of the plate body 31. Therefore, regardless of the position of the plate body 31, the elasticity adjusting plate 40 can adjust the elasticity back and forth.
Therefore, the elasticity adjusting mechanism 41 can adjust the elasticity back and forth without changing the positional relationship between the entire plate body 31 and the rear collision sensor 25 with respect to the dorsal frame 3, and the elasticity adjusting plate 40 can be adjusted back and forth. Existence of the whiplash detection mechanism 25 including the rear impact detection body 25 and the original function and effect of the plate body 31 are not affected at all.

In other words, in the case of the elastic force adjusting mechanism that pushes the cushion material forward, the cushion material is always urged forward, so that the rear impact is detected by the rearward movement of the cushion material, which is opposite to the moving direction of the rear impact detector. Therefore, it has been conventionally considered that the elasticity adjusting mechanism and the whiplash countermeasure mechanism cannot be used together. However, in this application, since the elasticity adjusting plate 40 is provided so as to move on the front side of the plate body 31, the coexistence is possible. ing.
Therefore, the elasticity adjustment plate 40 that can adjust the elasticity of the cushion is provided in the vehicle seat 1 provided with the whiplash prevention mechanism that can move the headrest 6 forward in the case of the rear collision by the rear collision detector 25 and the link mechanism. Is possible.

  That is, since the plate body 31 is attached to the dorsal frame 3 via the wire spring 32 so as to be movable back and forth, the elasticity adjusting plate 40 moves to the front side independently of the plate body 31 and from the rear side. When the seated person moves rearward due to the impact in response to the impact, the elasticity adjusting plate 40 and the plate body 31 move backward together by the inertial force. In this respect, the elasticity adjusting plate 40 of the elasticity adjusting mechanism 41 moves independently of the plate body 31 to the front side, but the movement direction when rearwardly collides is the same, and the elasticity adjusting plate 40 and the plate body 31 By rearward movement, the rear collision detector 25 moves rearward, and can detect a rear collision and can be provided side by side.

The upper edge of the elasticity adjusting plate 40 is located at the same level as or above the upper wire spring 32A, and the lower edge of the elasticity adjusting plate 40 is located below the lower wire spring 32B. A sufficient size of the elasticity adjusting plate 40 can be secured, and the elasticity and bending (bending) of the elasticity adjusting plate can be harmonized, and the elasticity adjusting plate 40 can be further curved (protruded forward) into a desired shape.
Since the elasticity adjusting plate 40 is formed by forming the notches 71 at the left and right side edges of the predetermined portion, the notches 71 can be reduced by reducing the sectional area of the elasticity adjusting plate 40. The stress is concentrated on the reduced portion, and the elasticity adjusting plate 40 is bent (protruded forward) into a desired shape to adjust the supporting elasticity of the seated person's body.
That is, even if the elasticity adjustment plate 40 is simply bent up and down and protrudes forward, it does not protrude forward according to the shape of the back of the seated person. The notch portion 71 is provided in the bent portion.

In this case, the predetermined portion of the elasticity adjusting plate 40 is formed on the pushing surface portion 70 that protrudes forward when the interval between the upper edge side (engagement portion 41) and the lower edge side (lower engagement portion 55) of the elasticity adjustment plate 40 is narrowed. Since the extrusion surface portion 70 is formed by forming notches 71 on the left and right side edges of the elasticity adjusting plate 40 at the portion that becomes the extrusion surface portion 70, the notch portion 71 is formed by the elasticity adjusting plate 40 near the extrusion surface portion 70. The elasticity adjustment plate 40 adjusts the support elasticity of the seated person's body.
That is, the elasticity adjusting plate 40 per seated person's waist is used as the extrusion surface portion 70, and the elasticity adjustment plate 40 is curved so that the extrusion surface portion 70 protrudes forward by the cutout portion 71.
Therefore, since the push-out surface part 70 behind the waist of a predetermined seated person is always pushed forward, a good seating feeling is provided.

Thus, since one or more (one or more) upper cutouts 72 are provided on the side edge of the elasticity adjusting plate 40 above the pushing surface part 70, the upper part of the elasticity adjusting plate 40 is used as an input at the time of sitting. It provides a seating feeling that is curved into a desired shape at a position targeted with respect to the load and fitted to the back of the seated person.
That is, when the elasticity adjusting plate is bent, stress is concentrated on the push-out surface portion 70 in addition to the cut-out portion 71 in addition to the cut-out portion 72 so that the upper cut-out portion 72 protrudes forward as a bending point. A plurality of positions in the vicinity of the upper notch portion 72 become bending points and bend like a polygon in side view.

Therefore, if the upper notch 72 is not provided, the upper portion of the elasticity adjusting plate 40 moves rearward due to the input load at the time of sitting and the back of the seated person sinks later and does not fit. 72, the upper part of the elasticity adjusting plate 40 acts to push forward against the input load at the time of sitting to suppress sinking behind the back of the seated person, and fit to the back of the seated person to provide a seating feeling. Make good.
The plate body 31 is formed in a substantially pentagonal shape like a baseball base, and the flange 33 is formed on both the left and right sides of the plate body 31 so as to protrude rearward. The plate body 31 is prevented from being deformed by an input load at the time of sitting.

Therefore, the flange 33 improves the rigidity of the plate body 31, and thus makes the elastic adjustment plate 40 protrude forward.
That is, if the rigidity of the plate body 31 is low, when the elastic adjustment plate 40 is protruded forward, the plate body 31 is also bent together, and the substantial forward protrusion amount of the elastic adjustment plate 40 is reduced. In this application, since the rigidity of the plate body 31 is improved by the flange 33, the elastic adjustment plate 40 is made to protrude forward.

In particular, since the flange 33 is provided in the vertical direction on both the left and right sides of the plate body 31, the plate body 31 can be prevented from being bent in the front-rear side, and the elasticity adjusting plate 40 can be firmly supported. Make the forward protrusion good.
In this case, the flange 33 is formed in such a manner that the vicinity of the extrusion surface portion 70 of the elasticity adjusting plate 40 is the highest, and is inclined so as to become lower as viewed from the side, upward and downward, and therefore the extrusion surface portion 70 of the elasticity adjustment plate 40. While the strength of the plate body 31 in the vicinity is made the strongest and is inclined so as to decrease toward the upper and lower sides of the plate body 31, the space efficiency is also improved and the plate body 31 is made thinner.

Thus, a pair of upper and lower wire springs 32 are provided, the upper wire spring 32A of the wire springs 32 is attached to the back side near the upper edge of the plate body 31, and the upper wire spring 32A has a bent portion 37 at the opening of the plate body 31. Since it is engaged with the engagement piece 38 so as to be on the front side of the 36 engagement pieces 38, the thickness of the plate body 31 in this portion can be reduced, which is preferable.
That is, when the ratio of the plate body 31 to the limited internal space of the vehicle seat 1 is reduced, there is a merit that the cushion material 4 is thickened, and the bent portion 37 of the upper wire spring 32A is formed as an opening portion of the plate body 31. When engaged so as to be on the front side of the 36 engagement pieces 38, the bent portion 37 is fixed within the thickness range of the plate body 31, and the thickness of the plate body 31 at the attachment portion of the upper wire spring 32 </ b> A. The thickness can be reduced.
Since the attachment portion of the lower wire spring 32B has the flange 33, a normal engagement hook may be provided.

  Thus, a fitting groove 55A formed longer than the left and right width of the cable tip engaging body 61 is provided on the surface side of the lower engaging portion 55 of the elasticity adjusting plate 40, and the cable is provided on either side of the fitting groove 55A. Since the insertion groove 58 is formed and the retaining body 55B with which the cable tip engagement body 61 is engaged is provided in the fitting groove 55A on the side where the cable insertion groove 58 is provided, the cable tip engagement body 61 is fitted into the fitting groove. When the cable end engaging body 61 is laterally slid toward the one side in the fitting groove 55A while the inner cable 57 is held by hand and the inner cable 57 is held by hand, the cable end engaging body 61 is placed inside the retaining body 55B. Will not come off due to contact.

Next, the inner cable 57 is engaged with the cable insertion groove 58 of the lower engaging portion 55, and the inner cable 57 is attached to the front side of the elasticity adjusting plate 40 with the cable tip engaging body 61 fitted in the fitting groove 55 </ b> A as a fulcrum. Then, the inside of the cable insertion groove 58 is moved to the back side of the elasticity adjusting plate 40.
Next, the entire wire cable 56 together with the outer tube 62 positioned on the back side of the elasticity adjusting plate 40 is positioned on the back side of the plate body 31 through the lower opening 60.
Next, when the outer tube 62 is pulled upward, the cable tip engaging body 61 moves upward while curving the elasticity adjusting plate 40, so that the tube tip 63 of the outer tube 62 is temporarily moved from the tube locking portion 65 of the plate body 31. When the outer tube 62 is pulled upward until it is positioned above, and the tube tip 63 is fitted to the tube locking portion 65 from above, the attachment of the wire cable 56 is completed.

Accordingly, the tube end 63 of the outer tube 62 can be pulled up to the tube locking portion 65 while curving the elasticity adjusting plate 40 simply by pulling the outer tube 62 by hand, so that the wire cable 56 can be very easily obtained. Can be attached.
That is, since the attachment of the wire cable 56 is performed against the restoring force of the elasticity adjusting plate 40 that returns from the bending, the two operations of bending the elasticity adjusting plate 40 and attaching the wire cable 56 are performed simultaneously. Although it is necessary to make it difficult to engage the cable tip engaging body 61 of the wire cable 56 with the lower engaging portion 55, the tube tip 63 of the outer tube 62 is engaged with the tube locking portion 65. Therefore, the pulling for engaging the outer tube 62 with the tube locking portion 65 simultaneously curves the elasticity adjusting plate 40 and can be easily attached.

As described above, the elasticity adjusting plate 40 engages the engaging portion of the upper part of the elasticity adjusting plate 40 with the engaging hole formed in the plate body 31, and the surface of the lower engaging part 55 of the elasticity adjusting plate 40. In the wire cable 56 in which the cable tip engaging body 61 is fitted and locked in the fitting groove 55A on the side, and then the cable tip engaging body 61 is fitted in the fitting groove 55A, the inner cable 57 is engaged with the lower portion. The inside of the cable insertion groove 58 is moved from the front side of the joint portion 55 and moved to the back side of the plate body 31 through the lower opening 60. Next, the tube tip 63 of the outer tube 62 of the wire cable 56 is moved to the outer tube 62. While being pulled upward to bend the elasticity adjusting plate 40, it is fitted to the tube locking portion 65 from above, and the elasticity is obtained by the tension of the wire cable 56. Since it is held engaged at the bottom of the burl plate 40 to the lower opening 60, can the whole mounting operation of the mounting and wire cable 56 of the elastic regulating plate 40 easily can facilitate assembly of the vehicle seat.
Therefore, the attachment of the elasticity adjusting plate 40 does not require a mounting part such as a bracket or a shaft member, and the upper engaging portion of the elasticity adjusting plate 40 is engaged with the engagement hole formed in the plate body 31. If the lower part of the elasticity adjusting plate 40 is engaged and held with the lower opening 60 by the tension of the wire cable 56, the attachment is completed, and not only the wire cable 56 but also the elasticity adjusting plate 40 can be easily attached. , A reasonable configuration.

Since the lower engagement portion 55 forms the cable insertion groove 58 and directly locks the cable end engagement body 61, it is not necessary to use a rod or bracket when installing the wire cable 56. Reduce and reduce costs.
Further, since the lower engaging portion 55 of the elasticity adjusting plate 40 is merely fitted into the lower opening 60 of the plate body 31, the attachment of the wire cable 56 is facilitated, and the lower engaging portion 55 is provided. Has a guide action when the elasticity adjusting plate 40 is bent by contact with the lower opening 60, and the lower engaging portion 55 is made of a synthetic resin in the contact portion with the lower opening 60. There is little generation of abnormal noise.

Further, since the lower engaging portion 55 is always pulled by the wire cable 56, it is securely fitted into the lower opening 60.
Further, since the cushioning material 4 of the dorsal seat 2 is provided on the front surface of the elasticity adjusting plate 40, the elasticity adjusting plate 40 is pushed by the cushioning material 4 from the front side and pulled by the wire cable 56 from the rear side, and the cushioning material 4 And the plate body 31 from the front and rear.
To do.

Since the tube tip 63 of the outer tube 62 of the wire cable 56 is fitted in the tube locking portion 65, the tube tip 63 of the outer tube 62 of the wire cable 56 is directly attached to the plate body 31. It is possible to reduce the thickness of the entire operation mechanism of the plate body 31 and the elasticity adjusting plate 40.
In addition, when the tube engaging portion 65 and the lower engaging portion 55 are disposed at substantially the same front and rear positions in a side view, the plate body 31 and the elasticity adjusting plate 40 and the entire operation mechanism of the elasticity adjusting plate 40 are further improved. The front and rear thickness can be reduced, which is preferable.

Further, since the inner cable 57 drawn from the tube tip 63 of the outer tube 62 is fitted in the fitting groove 68 in the plate body 31, not only the operation of the wire cable 56 is ensured but also the plate body. 31 and the entire thickness of the operating mechanism of the elasticity adjusting plate 40 and the elasticity adjusting plate 40 can be reduced.
That is, by providing the fitting groove 68, the tube locking portion 65 and the lower engaging portion 55 can be disposed within the front-rear width substantially the same as the width of the outer tube 62, so that the plate body 31 and the elasticity adjusting plate 40 are provided. In addition, the entire front and rear thickness of the operation mechanism of the elasticity adjusting plate 40 can be reduced.

The perspective view of a dorsal fin seat and a headrest. FIG. Disassembled perspective view (plate body and elasticity adjusting plate omitted). A perspective view of the dorsal seat frame (plate body and elasticity adjusting plate are omitted). The perspective view of a dorsal fin seat frame. The attachment state schematic perspective view of a plate body and an elasticity adjustment plate. The side view of a plate body and an elasticity adjustment plate. The perspective view of the engaging part of an elasticity adjustment plate. The side view of the state which attaches an elasticity adjustment plate to a plate body. The state figure which engaged the engagement part of the elasticity adjustment plate to the engagement hole. The side view which rotated the elasticity adjustment plate. The side view which rotated the elasticity adjustment plate. The partial vertical side view of a plate body. The partial vertical side view of a resilience adjustment plate. Sectional drawing of the lower engaging part part of an elasticity adjustment plate. The perspective view of the lower engaging part part of an elasticity adjustment plate. The attachment state perspective view of the front-end | tip of a wire cable. The attachment part perspective view of an upper side wire spring. The attachment part perspective view of an upper side wire spring. FIG. The cross-sectional plan view. The schematic side view which shows the flange of a plate body. Explanatory drawing of the curvature state of a resilience adjustment plate. The curvature state schematic diagram of an elasticity adjustment plate. The attachment state explanatory drawing of the tube latching | locking part of the outer tube of a wire cable. FIG.

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 ... Flange, 34 ... Top, 35 ... Inclined surface, 36 ... Opening part 37 ... Bending part 38 ... Engagement piece 40 ... Elasticity adjusting plate 41 ... Backward projecting engaging part 42 ... Front projecting engaging part 43 ... Upper engaging hole 44 ... Lower engaging hole 45 ... Back bulge part, 46 ... Downward arc engagement surface, 47 ... Lower side Arc surface, 50 ... forward bulging portion, 51 ... upward arc engagement surface, 52 ... upper arc surface, 55 ... lower engagement portion, 56 ... wire cable, 57 ... inner cable, 58 ... cable insertion groove, 60 ... down Side opening 61, cable tip engagement body, 62 ... outer tube, 63 ... tube tip, 65 ... tube locking portion, 66 ... arm, 67 ... upper recess, 68 ... fitting groove, 71 ... notch, 72 ... Upper notch.

Claims (6)

A single plate-like plate body 31 made of synthetic resin capable of supporting the back of the seated person is movable back and forth with respect to the dorsal frame 3 via a wire spring 32 on the dorsal frame 3 of the dorsal seat 2. A single plate-like elasticity adjusting plate 40 made of synthetic resin having elasticity so as to move back and forth with respect to the plate body 31 is provided on the front surface of the plate body 31. A lower opening 60 that engages with a lower engagement portion 55 of the elasticity adjusting plate 40 is formed at a lower portion of the plate body 31, so that the elasticity of the elasticity adjusting plate 40 can be adjusted. A fitting groove 55A formed longer than the left and right width of the cable tip engaging body 61 is provided on the surface side of the lower engaging portion 55, and the wire cable 56 is inserted into the fitting groove 55A at a position close to either the left or right side. A vehicle seat in which a cable insertion groove 58 through which the cable 57 is inserted is formed and a retaining body 55B in which the cable tip engagement body 61 of the inner cable 57 is engaged is provided in a fitting groove 55A in the vicinity of the cable insertion groove 58. . 2. The vehicle seat according to claim 1, wherein a tube locking portion 65 is provided at a predetermined position on the back surface of the plate body 31 so that the tube tip 63 of the outer tube 62 of the wire cable 56 is engaged and locked from above. . In claim 2, an engagement portion that engages with an engagement hole formed in the plate body 31 is formed at an upper predetermined position of the elasticity adjusting plate 40, and the lower position of the elasticity adjusting plate 40 is at the predetermined position. A lower engaging portion 55 that is vertically engaged with the lower opening 60 formed in the plate body 31 is formed, and the elasticity of the elasticity adjusting plate 40 is formed on the lower engaging portion 55 engaged with the lower opening 60. A vehicle seat in which the tip of the inner cable 57 of the wire cable 56 to be adjusted is locked and the lower part of the elasticity adjusting plate 40 is attached to the plate body 31 by the tension of the wire cable 56. A single plate-like plate body 31 made of synthetic resin capable of supporting the back of the seated person is movable back and forth with respect to the dorsal frame 3 via a wire spring 32 on the dorsal frame 3 of the dorsal seat 2. A single plate-like elasticity adjusting plate 40 made of synthetic resin having elasticity so as to move back and forth with respect to the plate body 31 is positioned on the front surface of the plate body 31. The cable tip engagement body 61 of the wire cable 56 is fitted to either the left or right side of the fitting groove 55A on the surface side of the joint portion 55, and the cable tip engagement body 61 faces the other side in the fitting groove 55A. Next, the inner cable 57 is inserted into the cable insertion groove 58 from the front side of the lower engagement portion 55 with the cable tip engagement body 61 fitted in the fitting groove 55A. The wire cable 56 is attached to the back side of the plate body 31 by moving the inner cable 57 from the lower opening 60 to the back side of the plate body 31 while moving in the cable insertion groove 58, and the lower engagement of the elasticity adjusting plate 40. The part 55 is a method for assembling a vehicle seat to be engaged with the lower opening 60 at the lower part of the plate body 31. In Claim 4, the wire cable 56 positioned on the back side of the plate body 31 from the front side of the plate body 31 through the lower opening 60 pulls the tube tip 63 of the outer tube 62 upward. The vehicle seat assembling method in which the elasticity adjusting plate 40 is temporarily positioned above the tube locking portion 65 of the plate body 31 and then the tube tip 63 is fitted into the tube locking portion 65 from above while curving the elasticity adjusting plate 40. 5. The elasticity adjusting plate 40 according to claim 4, wherein the elasticity adjusting plate 40 is engaged with the lower part of the elasticity adjusting plate 40 in a state where the upper engaging portion of the elasticity adjusting plate 40 is engaged with an engaging hole formed in the plate body 31. The cable end engaging body 61 of the wire cable 56 is fitted and locked in the fitting groove 55A on the surface side of the portion 55, and then the wire cable 56 in which the cable end engaging body 61 is fitted in the fitting groove 55A is an inner cable. 57 is moved in the cable insertion groove 58 from the front side of the lower engagement portion 55 and moved to the back side of the plate body 31 through the lower opening 60, and then the tube tip 63 of the outer tube 62 of the wire cable 56 is The outer tube 62 is pulled upward to bend the elasticity adjusting plate 40 and fitted into the tube locking portion 65 from above, and the wire cable The vehicle assembling method of a sheet for the lower portion of the elastic regulating plate 40 is engaged with and held by the lower opening 60 at 6 tension.

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