JP4863362B2 - Vehicle seat - Google Patents

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 plate 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. The configuration is known (for example, Patent Document 1).
Conventionally, a square frame-shaped internal structure is fixed to the frame of the dorsal seat, a lateral elastic bending portion is provided on the left and right sides of the internal structure, and a spring plate portion is provided between the elastic bending portions, A configuration in which a lumbar support portion is provided on the upper and lower sides of the spring plate portion via a longitudinal elastic bending portion is known (for example, Patent Document 2).
Moreover, although not publicly known, Japanese Patent Application No. 2004-313623 of the prior application proposes a configuration in which a single plate-like elasticity adjusting plate is provided in front of and behind the plate body.
JP 2006-21616 A JP-A-11-206506

Among the known examples, the former is well supported by the seated person, but has a problem that the elasticity cannot be adjusted in accordance with the body shape of the seated person.
Among the known examples, the latter has a problem that the four rounds of the internal structure are rigid, and the cushioning property of this portion is lowered.
In other words, because the square frame-shaped dorsal frame is further provided with a square frame-shaped internal structure, cushioning properties other than the central lumbar support portion are reduced.
Further, the prior application has a problem that the position of the thin portion that causes the elasticity adjusting plate to bend at a predetermined position moves up and down.
That is, as shown in FIG. 22, the prior application has a configuration in which the upper portion of the elasticity adjusting plate is moved up and down to move the thin portion P back and forth. Therefore, it was found that the positions of the thin portion P and the thin portion P ′ fluctuate greatly.
The present application supports the load in a stable state on the "surface", allows the cushioning elasticity to be adjusted according to the physique and preference of the seated person, and also supports the seated person's waist well, It is devised to improve the ring.

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-like elasticity adjusting plate 40 having elasticity so as to move back and forth with respect to the plate body 31, and a predetermined portion of the elasticity adjusting plate 40 is provided on the plate body 31. An interval between the upper edge side and the lower edge side of the elasticity adjusting plate 40 is formed on the extruded surface portion 70 that protrudes forward when the lower edge side is moved upward to make it narrow, and the elasticity adjusting plate 40 in the vicinity of the extruded surface portion 70 is moved back and forth. The elasticity adjusting plate 40 is configured to be able to adjust the support elasticity of the body of the seated person, and the position of the push-out surface portion 70 is located below a substantially middle part between the upper edge side and the lower edge side of the elasticity adjusting plate 40. It is obtained by a vehicle seat configured to so that.
The present invention relates to a vehicle seat configured such that a distance L between the extruded surface portion 70 and the lower edge of the elasticity adjusting plate 40 is shorter than a distance K between the extruded surface portion 70 and the upper edge of the elasticity adjusting plate 40. It is a thing.
In the present invention, the elasticity adjusting plate 40 has its upper portion fixed to the plate body 31 and its lower engaging portion 55 attached vertically to the plate body 31 so that the lower engaging portion 55 can be moved upward. The vehicle seat is configured to be moved to move the extrusion surface portion 70 forward.
According to the present invention, the extrusion surface portion 70 includes any one or a plurality of the grooves or slits 71, the thin-walled portion 72 that is slightly thinner than the portions of the other elasticity adjusting plates 40, and the holes 73. This is a vehicle seat configured in combination.
According to the present invention, the push-out surface portion 70 is configured to protrude forward when the interval between the upper edge side and the lower edge side of the elasticity adjusting plate 40 is narrowed by a notch 74 obtained by notching a predetermined portion of the outer edge of the elasticity adjusting plate 40. This is a vehicle seat.

According to the first aspect of the present invention, it is possible to adjust the elastic force pushed forward of the cushion material 4 according to the physique and preference of the seated person, while minimizing the fluctuation of the vertical position of the pushing surface portion 70 during the adjustment. The user's waist can be supported well, and the sitting feeling can be improved.
In the invention of claim 2, the waist of the seated person is improved by minimizing the fluctuation of the vertical position of the extruded surface portion 70 when adjusting the moving radius when the extruded surface portion 70 moves back and forth as much as possible. The seating feeling can be improved.
In the third aspect of the invention, the lower engaging portion 55 of the elasticity adjusting plate 40 is moved upward to move the push-out surface portion 70 forward, so that the fluctuation of the vertical position of the push-out surface portion 70 is further reduced, and the waist of the seated person Can be satisfactorily supported, and the sitting feeling can be improved.
In invention of Claim 4, the extrusion surface part 70 can be comprised easily and a manufacturing cost can be made low.
In invention of Claim 5, the extrusion surface part 70 can be comprised easily and a manufacturing cost can be made low.

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 a skin member 5 (FIG. 1).
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 and moves 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 collision detector 25 is only positioned between the left and right side frames 17 and does not give the seated person an uncomfortable feeling or an uncomfortable feeling.

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. 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 via a wire spring 32 such as a zigzag spring or a formed wire spring so that the plate-like support member 30 can move back and forth. Support the seated person by holding back and forth.
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 backward while maintaining the surface shape. 31 is attached to the dorsal frame 3 so that the upper edge of the plate body 31 is supported by the upper wire spring 32A, and the predetermined positions between the upper and lower sides of the plate body 31 are supported by the lower wire spring 32B.

The lower wire spring 32B is formed in a substantially straight line when viewed from the front, and a portion of the plate body 31 below the lower wire spring 32B is formed in the lower bending portion 33. The lower bending portion 33 is configured to bend rearward with respect to the upper portion of the plate body 31 when viewed from the side, when a seated person's load is applied, and the entire plate body 31 moves backward while maintaining the surface shape in this state. To do.
That is, the lower wire spring 32B is formed to have rigidity to support a seated person's load, while the lower bending portion 33 is formed to have elasticity to be bent by the seated person's load. .
Therefore, the lower bending portion 33 bends backward with the vicinity of the lower wire spring 32B as a fulcrum when a load on the seated person is applied.
Further, an intermediate bent portion 32C protruding forward in plan view is formed in the left and right intermediate portion of the lower wire spring 32B, and the intermediate bent portion 32C is engaged with an engagement hole 32D formed in the plate body 31. The intermediate bent portion 32C and the engagement hole 32D prevent vertical and horizontal misalignment between the lower wire spring 32B and the plate body 31, and lower the rigidity of the plate body 31 by the engagement hole 32D. The effect | action used as the fulcrum which bends behind the lower side bending part 33 is also anticipated.

The respective ends of the upper wire spring 32A and the lower wire spring 32B are attached to the side frames 17 of the dorsal frame 3 respectively.
Therefore, a support spring 34 is provided on the back side of the lower bending portion 33. The support spring 34 is formed in a U shape (FIG. 6), and the setting of the bending load of the lower bending portion 33 is changed by changing the line length and material.
That is, if the support spring 34 is hardened, the amount of backward bending of the lower bending portion 33 is reduced, and if the support spring 34 is softened, the amount of backward bending of the lower bending portion 33 is increased.
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, on the front side of the plate body 31 of the plate-shaped support member 30, an elasticity adjusting plate 40 that moves back and forth with respect to the plate body 31 is provided.
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 front projecting engaging portions 42 projecting rearward are arranged in the left and right directions at predetermined positions on the rear surface of the elastic adjustment plate 40 (FIG. 8). 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 (FIGS. 6 and 9).
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. (FIG. 9), and after the rear projecting engaging portion 41 and the front projecting engaging portion 42 are inserted and engaged in the upper engaging hole 43 and the lower engaging hole 44, the elasticity is adjusted with the center G as an axis. The plate is configured to rotate.
That is, the upper part of the elasticity adjusting plate 40 is inserted with the rear projecting engagement part 41 and the front projecting engagement part 42 into the upper engagement hole 43 and the lower engagement hole 44 of the plate body 31 from the front side (FIG. 9). After insertion, the downward arc engagement surface 46 of the rearward projecting engagement portion 41 is engaged with the lower arc surface 47 of the upper engagement hole 43 (FIG. 10), and the upward arc engagement of the forward projection engagement portion 42 is performed. When the surface 51 is engaged with the upper circular arc surface 52 of the lower engagement hole 44 and then the elasticity adjusting plate 40 is rotated downward with the center G as an axis, the elasticity adjusting plate 40 is placed on the front surface of the plate body 31. Overlapping (FIG. 11).

A lower engaging portion 55 protruding rearward is formed at a predetermined position below the elasticity adjusting plate 40. A cable insertion groove 58 into which the tip of the inner cable 57 of the wire cable 56 is inserted is formed in the lower engagement portion 55 (FIGS. 6 and 14). The lower engaging portion 55 of the elasticity adjusting plate 40 protrudes from the lower opening 60 provided at the lower portion of the plate body 31 to the rear side of the plate body 31, and the lower engaging portion 55 protrudes to the rear side of the plate body 31. The tip of the inner cable 57 is fitted into the cable insertion groove 58, and the cable tip engaging body 61 at the tip of the inner cable 57 is engaged and locked to the fitting portion 55A of the lower engaging portion 55 (understand in FIG. 14). For this reason, the cable tip engagement body 61 is not brought into contact with the fitting portion 55A, but the configuration is not limited thereby).
In this case, the lower engaging portion 55 and the lower opening 60 are formed to have substantially the same left and right 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 for locking 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 (FIG. 6). 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 embodiment, the tube locking portion 65 is formed on the plate body 31. An upper opening 67 is formed, a pair of arm portions 66 are provided at the left and right edges of the upper opening 67, and a recess space is formed by the upper opening 67 and the left and right arm portions 66 so that the tube tip 63 is buried. The tube tip 63 is fitted into the upper opening 67. The tube tip 63 is fitted into the upper opening 67 while being sandwiched from the left and right sides by the arm portion 66 of the tube locking portion 65.

The plate body 31 between the tube locking portion 65 and the lower engagement portion 55 is formed with a fitting groove 68 recessed in the front side (FIG. 6), and the inner cable 57 is fitted into the fitting groove 68. .
When the inner cable 57 is pulled, the wire cable 56 pulls the lower engaging portion 55 of the elasticity adjusting plate 40 to which the cable tip engaging body 61 of the inner cable 57 is attached, and the lower engaging portion 55 of the elasticity adjusting plate 40. As a result, the distance between the upper edge of the elasticity adjusting plate 40 and the lower engaging portion 55 of the elasticity adjusting plate 40 is shortened, and the front surface of the elasticity adjusting plate 40 is pushed forward.
Thus, the support spring 34 by a vertical shaft portion 34A and the horizontal axis portion support spring 34B is formed in a U-shaped (FIG. 6), the vertical axis portion 34A in the right and left sides of the lower opening 60, the horizontal rod portion If the support spring 34B is positioned below the lower edge of the lower opening 60, the amount of bending of the lower bending portion 33 can be set easily and accurately, which is preferable.

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.
Although the configuration of the extrusion surface portion 70 is arbitrary, FIG. 23 shows that the elastic adjustment plate 40 of the portion of the extrusion surface portion 70 is configured by arranging horizontal grooves or slits 71 side by side in the vertical direction. Because it is, it bends when stress is concentrated. In FIG. 24, the elasticity adjusting plate 40 in the portion of the extrusion surface portion 70 is formed as a thin portion 72 that is slightly thinner than the portions of the other elasticity adjusting plates 40. FIG. 25 shows a configuration in which a hole 73 having a predetermined shape is formed in the elasticity adjusting plate 40 of the extrusion surface portion 70. Reference numeral 74 denotes a notch formed by notching a predetermined portion of the outer edge of the elasticity adjusting plate 40. The notch 74 is made to be curved by reducing the cross-sectional area of the elasticity adjusting plate 40.

26 is formed with ribs 75 having a predetermined shape on the back surface of the elastic adjustment plate 40 at the upper and lower portions of the extrusion surface portion 70 to increase the rigidity of the elastic adjustment plates 40 on both the upper and lower sides of the extrusion surface portion 70. Thus, the push-out surface portion 70 is configured to bend when the elasticity adjusting plate 40 is bent.
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 both the left and right sides of the headrest mounting rod 10 are fixed to the upper portion of the upper link rod 15. 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 of the upper link rod 15, and the lower part of the transmission member 20 is vertically connected to the lower link 26 attached to the side frame 17. Since the left and right sides of the rear impact detector 25 are attached to the lower part of the lower link 26 in a connected state, the cushion member 4 is received when the seated person moves rearward due to an impact from the rear. , The cushion member 4 pushes the plate body 31 rearward, the plate body 31 moves the rear collision detection body 25 backward, and the lower link 26 is moved by the rear movement of the rear collision detection body 25. The transmission member 20 is moved downward to cause the upper link rod 15 to rotate 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 shaft 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 of the plate-like support member 30 is formed in a substantially rectangular single plate shape, the load applied only to a predetermined portion of the plate body 31 can be increased or decreased by moving the entire plate body 31 backward. Distribute the load to the left and right to support it securely.
That is, for example, if the upper and lower plate bodies 31 are divided and formed, when a load is applied to a portion between the upper and lower plate bodies 31, the upper and lower plate bodies 31 may rotate and cannot reliably support the load. However, in the present application, since the plate-like support member 30 is formed by the substantially rectangular single plate-like plate body 31, the load applied to the middle of the upper and lower sides is reliably received and supported by the entire plate-like support member 30.

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 two. 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, an elastic adjustment plate 40 is provided on the front side of the plate body 31 of the plate-shaped support member 30, and the upper portion of the elastic adjustment plate 40 includes a rear protruding engagement portion 41 and a front protruding engagement portion 42. The lower engaging portion 55 below the elasticity adjusting plate 40 is engaged with each of the upper engaging hole 43 and the lower engaging hole 44 of the plate body 31, and the lower opening portion provided below the plate body 31. The inner cable 57 is fitted into the cable insertion groove 58 of the lower engaging portion 55 projecting from the opening 60 to the rear side of the plate body 31 and projecting to the rear side of the plate body 31, so that the cable at the tip of the inner cable 57 Since the front end engaging body cable front end engaging body 61 is engaged with the lower surface of the lower engaging portion 55, when the distance between the upper edge and the lower edge of the elastic adjustment plate 40 is shortened, the upper and lower sides of the elastic adjustment plate 40 are substantially omitted. The middle part competes forward, increasing the pressure pushing the seat forward, and conversely, if the distance between the upper and lower edges of the elastic adjustment plate 40 becomes longer, the upper and lower intermediate parts of the elastic adjustment plate 40 The pressure to push the seated person forward is weakened, and the elasticity for the seated person is changed and adjusted 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 plate 40 can adjust the elasticity back and forth without changing the positional relationship between the entire plate body 31 and the rear collision sensing body 25 with respect to the dorsal fin frame 3, and the presence of the elasticity adjusting plate 40 is the rear collision. There is no influence on the whiplash countermeasure mechanism including the sensing body 25 or the original function and effect of the plate body 31.

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 of pushing the cushion material 4 forward can be adjusted while the vehicle seat 1 is provided with a whiplash countermeasure mechanism that can move the headrest 6 forward during the rear collision by the rear collision detector 25 and the link mechanism. The elastic adjustment plate 40 can be provided side by side.
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.

  Thus, the elasticity adjusting plate 40 is formed in the shape of a single plate made of synthetic resin having elasticity, and the rear protrusion engaging portion 41 and the front protrusion engaging at the rear upper surface at a predetermined position on the rear surface of the elasticity adjusting plate 40. A plurality of joint portions 42 are juxtaposed in the left-right direction, the rearward projecting engaging portion 41 forms a rearwardly bulging portion 45 on the upper side, a downward arc engaging surface 46 is provided on the lower surface of the rearwardly bulging portion 45, and forwardly projecting The engagement portion 42 is formed by forming a front bulge portion 50 on the rear side of the downward arc engagement surface 46 of the rearward projecting engagement portion 41 and providing an upward arc engagement surface 51 on the lower surface of the front bulge portion 50. Therefore, when the rear projecting engagement portion 41 and the front projecting engagement portion 42 are inserted into the upper engagement hole 43 and the lower engagement hole 44 of the plate body 31 from the front side, the rear projecting engagement portion 41 and the front projecting engagement The joint portion 42 increases the distance between the rear bulge portion 45 and the front bulge portion 50. While entering the upper engaging hole 43 and the lower engagement hole 44.

When the rear bulging portion 45 of the rear protruding engagement portion 41 that has entered and the front bulging portion 50 of the front protruding engagement portion 42 get over the lower arc surface 47 and the upper arc surface 52, The downward arc engagement surface 46 engages with the lower arc surface 47 of the upper engagement hole 43, and the upward arc engagement surface 51 of the forward projecting engagement portion 42 engages with the upper arc surface 52 of the lower engagement hole 44. .
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. Therefore, when the elastic adjustment plate 40 is rotated downward about the center G after the rear protrusion engagement portion 41 and the front protrusion engagement portion 42 are engaged, the elasticity adjustment plate 40 is formed on the plate body 31. It overlaps the front.
Accordingly, the rear projecting engagement portion 41 and the front projecting engagement portion 42 are positioned so as to sandwich the lower arc surface 47 and the upper arc surface 52 of the plate body 31 from the front and the rear, so that the wire cable 56 is provided with the elasticity adjusting plate 40. When the lower engaging portion 55 is pulled upward, a force acts so that the rearward projecting engaging portion 41 and the front projecting engaging portion 42 of the elasticity adjusting plate 40 move upward. Since the upward arc engagement surface 51 is in contact with the upper arc surface 52 of the lower engagement hole 44, the engagement portion between the front protrusion engagement portion 42 and the lower engagement hole 44 is not disengaged, and the elasticity adjustment plate 40. Moves forward.

On the contrary, when the wire cable 56 is loosened and the lower engagement portion 55 of the elasticity adjusting plate 40 is moved downward, the downward arc engagement surface 46 of the rearward projecting engagement portion 41 becomes the lower arc surface 47 of the upper engagement hole 43. Therefore, the engagement portion between the rearward projecting engagement portion 41 and the rear bulge portion 45 is not disengaged, and the elasticity adjusting plate 40 moves rearward.
Thus, the rearward projecting engaging portion 41 and the front projecting engaging portion 42 of the elasticity adjusting plate 40 not only facilitate the attachment of the elasticity adjusting plate 40 but also engage when the elasticity adjusting plate 40 moves back and forth. It is a rational configuration that does not deviate.

Therefore, the lower engagement portion 55 of the elasticity adjusting plate 40 is fitted into the lower opening 60 of the plate body 31 and the wire cable 56 is directly inserted into the cable insertion groove 58 of the lower engagement portion 55. When installing the wire cable 56, it is not necessary to use rods or brackets, reducing the number of parts and reducing the cost.
Further, since the contact portion between the lower engaging portion 55 of the elasticity adjusting plate 40 and the lower opening 60 of the plate body 31 is made of synthetic resin, there is little occurrence of abnormal noise.
Further, the lower engagement portion 55 of the elasticity adjusting plate 40 is pulled upward by the wire cable 56, and the cushion material 4 of the dorsal seat 2 is provided on the front surface of the elasticity adjusting plate 40. Therefore, the elasticity adjusting plate 40 is moved from the front side. It is pushed by the cushion material 4, pulled by the wire cable 56 from the rear side, and is sandwiched from the front and rear by the cushion material 4 and the plate body 31.
Further, since the lower engaging portion 55 and the lower opening 60 are formed to have substantially the same left-right width, when the elasticity adjusting plate 40 is bent, the lower engaging portion 55 and the lower opening 60 are mutually guided. Thus, the elasticity adjusting action of the elasticity adjusting plate 40 is made smooth and reliable.

Since the tube locking portion 65 for locking 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 tip 63 of the outer tube 62 of the wire cable 56 is attached. It can be attached so as to be directly embedded in the plate body 31, and it is possible to reduce the thickness of the entire operation mechanism of the plate body 31 and the elasticity adjusting plate 40.
Further, by arranging the tube locking portion 65 and the lower engaging portion 55 at substantially the same front and rear positions, the thickness of the entire plate body 31 and the elasticity adjusting plate 40 and the whole operating mechanism of the elasticity adjusting plate 40 can be reduced. It is possible to reduce the thickness, 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.

Thus, a pair of upper and lower wire springs 32 for attaching the plate body 31 to the dorsal frame 3 are provided, and the upper wire spring 32A of the wire spring 32 is attached to the back side near the upper edge of the plate body 31. The lower wire spring 32B is attached to a predetermined position between the upper and lower sides of the plate body 31, the synthetic resin plate body 31 is formed so as to bend from the metal lower wire spring 32B, and the plate below the lower wire spring 32B. Since the portion of the body 31 is formed in the lower bending portion 33, the lower bending portion 33 bends backward with the vicinity of the lower wire spring 32B as the center of rotation when a seated person sits and a load is applied. Therefore, the seating feeling is improved.
That is, since the plate body 31 is made of a single plate-like synthetic resin, when a load is applied to the lower bending portion 33 with respect to the support portion of the lower wire spring 32B, the lower bending portion 33 bends backward. Therefore, from the back to the waist of the seated person, the back of the scapula is located near the scapula and the back of the scapula. Although the seating fatigue is increased by floating more, when the seated person's waist hits the lower bending portion 33, the lower bending portion 33 bends backward so that the entire back portion is closely attached to the dorsal seat 2, Reduces fatigue and improves seating feeling.

In this case, since the elasticity adjusting plate 40 moves forward if the wire cable 56 pulls the lower engaging portion 55 upward, even if the lower bending portion 33 is bent rearward, the lower engaging portion 55 and the tube are locked. If the distance from the portion 65 is the same, the amount of forward movement of the elasticity adjusting plate 40 does not change, and the elasticity adjusting plate 40 that moves forward and the lower bending portion 33 of the plate body 31 that flexes backward are in conflict. A vehicle seat 1 having a good seating feeling that can be made compatible while being in the moving direction is provided.
Further, the lower wire spring 32B is formed to have rigidity to support the load of the seated person, while the lower bending portion 33 is formed to have elasticity that is bent by the load of the seated person. Therefore, when a seated person's load is applied, the lower bending portion 33 bends backward with the vicinity of the lower wire spring 32B as a fulcrum.
Therefore, the amount of deflection changes depending on the degree of load of the seated person.
Further, since the lower wire spring 32B is formed with rigidity and the lower bending portion 33 is formed so as to have elasticity, the plate body 31 has the lower bending portion 33 formed by the load of the seated person. When bent backward, the entire plate body 31 moves backward while maintaining the surface shape in this state.

  Thus, an intermediate bent portion 32C protruding forward in plan view is formed in the left and right intermediate portion of the lower wire spring 32B, and the intermediate bent portion 32C is engaged with an engagement hole 32D formed in the plate body 31. Thus, the intermediate bent portion 32C and the engagement hole 32D prevent vertical and horizontal misalignment between the lower wire spring 32B and the plate body 31, and lower the rigidity of the plate body 31 by the engagement hole 32D. The effect | action used as the fulcrum which the part 32C bends behind the lower side bending part 33 is also anticipated.

Thus, although the amount of bending of the lower bending portion 33 varies depending on the load of the seated person, a support spring 86 is provided on the back side of the lower bending portion 33. By changing the above, the amount of bending of the lower bending portion 33 can be easily set.
Accordingly, the predetermined portion of the elasticity adjusting plate 40 is formed on the extrusion surface portion 70, and when the elasticity adjustment plate 40 is bent, the extrusion surface portion 70 is elastically deformed and protrudes forward. When bent up and down, the portion of the pushing surface portion 70 always moves forward, so that the position where the elasticity for pushing the seated person can be adjusted does not change, and the seating feeling is improved.
In this case, the position of the extrusion surface portion 70 is lower than the substantially vertical middle between the upper edge and the lower edge of the elasticity adjusting plate 40 and is more than the distance K between the upper edge of the elasticity adjustment plate 40 and the extrusion surface portion 70. The elasticity adjustment plate 40 is configured such that the upper portion of the elasticity adjusting plate 40 is fixed to the plate body 31 and the lower engaging portion 55 of the lower portion is vertically moved to the plate body 31. Since the elastic adjustment plate 40 can be freely attached, the lower engaging portion 55 can be moved upward to move the push-out surface portion 70 forward. Therefore, the rotation fulcrum of the push-out surface portion 70 is located on the elastic force adjustment plate 40. Near the edge, the difference between the height position when the extrusion surface portion 70 is the rearmost side and the height position of the frontmost side is made as small as possible.

  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 the distance L with the portion 55 to be shorter, fluctuations in the vertical position when the push-out surface portion 70 moves back and forth due to the bending of the elasticity adjusting plate 40 are suppressed.

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 positional relationship figure of the elasticity adjustment plate before seating and a plate body. The positional relationship figure which shows an example of the state which the lower side bending part bent. The positional relationship figure which shows an example of the state which the elasticity adjustment plate protruded ahead. The positional relationship figure which shows an example of the state which the elasticity adjustment plate protruded ahead and the lower side bending part bent. Schematic explaining the vertical movement of an extrusion surface part. Schematic which shows the subject of a prior application. The perspective view of the Example of an extrusion surface part. The perspective view of the other Example of an extrusion surface part. The perspective view of the other Example of an extrusion surface part. The perspective view of the other Example of an extrusion surface 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-like support material 31 ... Plate body 32 ... Wire spring 40 ... Elasticity adjusting plate 41 ... Backward projecting engagement portion 42 ... forward projecting engaging part, 43 ... upper engaging hole, 44 ... lower engaging hole, 45 ... rear bulging part, 46 ... downward arc engaging surface, 47 ... lower arc surface, 50 ... forward bulging part 51 ... Upward arc engaging surface, 52 ... Upper arc surface, 55 ... Lower engaging portion 56 ... Wire cable, 57 ... Inner cable, 61 ... Cable tip engagement body, 58 ... Cable insertion groove, 60 ... Lower opening, 62 ... Outer tube, 63 ... Tube tip, 65 ... Tube locking part, 66 ... Arm , 67 ... upper opening, 68 ... fitting groove, 70 ... extruded surface part ..., 71 ... groove or ... slit, 72 ... thin-walled part, 73 ... hole, 74 ... notch part .

Claims (5)

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. The plate body 31 is provided with a single plate-like elasticity adjusting plate 40 having elasticity so as to move back and forth with respect to the plate body 31, and a predetermined portion of the elasticity adjusting plate 40 is the elasticity adjusting plate 40. An interval between the upper edge side and the lower edge side is formed on the extruded surface portion 70 that protrudes forward when the lower edge side is moved upward to narrow, and the elasticity adjusting plate 40 in the vicinity of the extruded surface portion 70 is moved back and forth to move the elasticity adjusting plate. 40 so that the support elasticity of the body of the seated person can be adjusted, and the position of the push-out surface portion 70 is positioned below the middle of the upper and lower edges of the elasticity adjusting plate 40. Form sheet for the vehicle. The vehicle seat according to claim 1, wherein a distance L between the extrusion surface portion 70 and the lower edge of the elasticity adjusting plate 40 is shorter than a distance K between the extrusion surface portion 70 and the upper edge of the elasticity adjustment plate 40. . 3. The elasticity adjusting plate 40 according to claim 2, wherein the upper portion of the elasticity adjusting plate 40 is fixed to the plate body 31 and the lower engaging portion 55 is attached to the plate body 31 so as to be vertically movable. A vehicle seat configured to move upward and move the extrusion surface portion 70 forward. In claim 1, claim 2, or claim 3, the extrusion surface portion 70 includes a groove or slit 71, a thin portion 72 that is slightly thinner than the portion of the other elasticity adjusting plate 40, and a hole 73. A vehicle seat configured by combining any one or more of them. In claim 1, claim 2, or claim 3, the push-out surface portion 70 has an interval between the upper edge side and the lower edge side of the elasticity adjusting plate 40 by a notch 74 that is formed by notching a predetermined portion of the outer edge of the elasticity adjusting plate 40. A vehicle seat configured to protrude forward when narrowed.

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