JP5007067B2 - 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 bent portion is provided on the left and right sides of the internal structure, and a spring plate portion is provided between the horizontal elastic bent 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).
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.
The present application makes it possible to adjust the elasticity of pushing the cushion material forward according to the physique and preference of the seated person, and to facilitate the attachment of a plate for adjusting the elasticity.

In the present invention, a plate body 31 for supporting a load while elastically deforming a single plate-shaped synthetic resin capable of supporting the back of a seated person on a back frame 3 of a back seat 2 is provided via a wire spring 32. A plate-shaped support member 30 is configured to be movable back and forth with respect to the dorsal frame 3, and a single-plate elastic adjustment plate 40 made of synthetic resin and having elasticity is attached to the plate body 31. 31 is configured to be able to adjust the support elasticity of the seated person's body by the elasticity adjusting plate 40, and is formed on the plate body 31 at a predetermined position above the elasticity adjusting plate 40. A plurality of engaging portions that engage with the engaging holes are arranged in the left-right direction, and the engaging portions are detachably engaged with the engaging holes so as not to move back and forth and up and down, and a predetermined angle after engagement. Within the range Plate 40 is obtained by the configuration the vehicle seat to pivot.
In the present invention, a plate body 31 for supporting a load while elastically deforming a single plate-shaped synthetic resin capable of supporting the back of a seated person on a back frame 3 of a back seat 2 is provided via a wire spring 32. A plate-like support member 30 is configured to be movable back and forth with respect to the dorsal frame 3, and an elastic plate 40 made of synthetic resin having a single plate shape having elasticity is attached to the plate body 31. 31 so as to adjust the support elasticity of the seated person's body by means of the elasticity adjusting plate 40, and a rearward protrusion projecting rearward at a predetermined upper position of the elasticity adjusting plate 40. A plurality of engaging portions 41 and a plurality of front projecting engaging portions projecting forward are arranged in the left-right direction, and the rear projecting engaging portions 41 and the front projecting engaging portions are formed on the plate body 31. Joint hole 4 And it is obtained by a vehicle seat mounted is engaged respectively engaged in the lower engagement hole 44.
In the present invention, the rear projecting engagement portion 41 is formed by forming a rear bulge portion 45 on the upper side and a downward arc engagement surface 46 on the lower surface of the rear bulge portion 45. 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 by providing an upward arc engagement surface 51 on the lower surface of the front bulge portion 50, The downward arc engagement surface 46 is in front of the lower arc surface 47 of the lower surface in the upper engagement hole 43, and the upward arc engagement surface 51 is rear in the upper arc surface 52 of the upper surface in the lower engagement hole 44. The vehicle seat is configured to engage with each other.
In the present invention, the lower arcuate surface 47 of the upper engagement hole 43 and the upper arcuate surface 52 of the lower engagement hole 44 are the center of the upper and lower intermediate predetermined positions of the lower arcuate surface 47 and the upper arcuate surface 52 when viewed from the side. G is formed so as to have an arc surface substantially coinciding with a concentric circle G, and the rear projecting engaging portion 41 and the front projecting engaging portion 42 are inserted into the upper engaging hole 43 and the lower engaging hole 44 after being engaged. This is a vehicle seat that is arranged and configured so that the elasticity adjusting plate 40 can rotate about the center G as an axis.

In the invention of claim 1, the elastic regulating plate 40 is rotated from the engaged with the engagement portion of the elastic regulating plate 40 to the engagement hole of the plate member 31, to be the Mounting elasticity adjustment plate 40 Can be installed easily.
In the invention of claim 2, the upper engagement hole 43 and the lower engagement hole 44 of the plate body 31 are engaged with the rearward projecting engagement part 41 and the frontward projecting engagement part 42 of the elasticity adjusting plate 40. Therefore, the structure is simple and the attachment is easy. Further, by forming both the plate body 31 and the elasticity adjusting plate 40 with synthetic resin, it is possible to suppress the generation of abnormal noise at the attachment portions of both.
In the third aspect of the invention, the rearward projecting engagement portion 41 engages with the lower arcuate surface 47 from above, and the upward arcuate engagement surface 51 engages with the upper arcuate surface 52 from below. The most rational configuration as the mounting configuration of the elasticity adjusting plate 40 that is mounted so that it does not disengage even if it acts on the plate body 31 and the upper and lower ends of the elasticity adjusting plate 40 move up and down with respect to the plate body 31. Can be.
In the invention of claim 4, after the rearward projecting engaging portion 41 and the front projecting engaging portion 42 are engaged with the upper engaging hole 43 and the lower engaging hole 44, the elasticity adjusting plate 40 is centered on the center G. Since it can be rotated, it can be installed easily.

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. Since the entire upper body of the seated person can be supported by the “surface” and the headrest 6 moving forward supports the head, the plate-like support member 30 supports the upper body of the seated person by the “surface”. The seating posture of the seated person including the head is extremely stabilized.
The plate-like support member 30 is formed by a substantially rectangular single plate-like plate body 31, and the plate body 31 is seated while having a predetermined strength capable of supporting a seated person by a synthetic resin such as polypropylene. If the load is supported while being elastically deformed to some extent when it receives a rear load (including the case of weight) from a person, it is preferable because the feeling at the time of back contact called “contact” can be made flexible.

The plate-like support member 30 is configured by attaching the plate body 31 to the dorsal frame 3 through a wire spring 32 such as a zigzag spring or a formed wire spring so as to be movable back and forth. Support the seated person back and forth while holding.
In this case, the wire spring 32 has a predetermined elasticity, and is configured such that when a load is applied to the plate body 31, the entire plate body 31 can move rearward while maintaining the surface shape.
A pair of upper and lower wire springs 32 are provided, and an intermediate portion is attached to the back side of the plate body 31 so that the wire springs 32 protrude laterally from the left and right side edges of the plate body 31. The upper wire spring 32 </ b> A in the wire spring 32 is attached to the back side near the upper edge of the plate body 31, and 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.
32C is an opening for fitting the left and right intermediate portions of the lower wire spring 32B.

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 front projecting engaging portions 42 that protrude rearward are arranged in parallel in the left and right directions at predetermined positions on the rear surface of the elasticity adjusting plate 40 . Backward protruding engaging portion 41 and the forward projection engaging portion 42 is engaged with the upper engaging hole 43 formed in the plate member 31 and the lower engagement hole 44.
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 of 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 lower surface of the lower engaging portion 55.

A fitting recess 55A into which the cable tip engagement body 61 is fitted is formed on the front side of the lower engagement portion 55 of the embodiment, and the right and left movement of the cable tip engagement body 61 is fixed.
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 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.

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.
When the inner cable 57 of the wire cable 56 is pulled, the cable end engaging body 61 of the inner cable 57 pulls the lower engaging portion 55 of the attached elasticity adjusting plate 40 upward, and the lower engaging portion 55 of the elasticity adjusting plate 40 is pulled. 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 elasticity adjusting plate 40 is pushed forward.

(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 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, the elasticity adjusting plate 40 is provided on the front side of the plate body 31 of the plate-like support member 30, and the upper part of the elasticity adjusting plate 40 is provided with the rear protruding engaging portion 41 and the front protruding engaging portion 42. The lower engagement portion 55 at the lower portion of the elasticity adjusting plate 40 is engaged with the upper engagement hole 43 and the lower engagement hole 44 of the body 31, and the lower opening portion 60 provided at the lower portion of the plate body 31 is a plate. The inner cable 57 is fitted into the cable insertion groove 58 of the lower engaging portion 55 projecting to the rear side of the body 31 and projecting to the rear side of the plate body 31, so that the cable tip engaging body 61 at the tip of the inner cable 57 is fitted. Since it is engaged with the cable insertion groove 58 of the lower engaging portion 55, if the distance between the upper edge and the lower edge of the elastic adjustment plate 40 is shortened, the upper and lower intermediate portions of the elastic adjustment plate 40 will compete forward. , When the pressure to push the occupant forward is increased and, conversely, when the distance between the upper edge and the lower edge of the elastic adjustment plate 40 is increased, the upper and lower middle portions of the elastic adjustment plate 40 are moved backward, and the occupant is moved forward. The pressure applied to is reduced, and the elasticity of 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.
Thus, without changing the positional relationship between the whole and the rear突感intellectual body 25 of the plate member 31 against the back凭frame 3, resilient adjustment plate 40 can adjust the elastic and the front and rear, the presence of elastic regulating plate 40 is a rear end collision sensing There is no influence on the whiplash countermeasure mechanism including the 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 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 regard, although the bullet force adjustment plate 40 relative to the plate body 31 moves forward independently, movement direction when the rear collision is consistent, then the rearward movement of the elastic regulating plate 40 and plate 31 Both of the collision detectors 25 move backward to detect a rear collision and can be installed together.

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 distance between the rear bulging portion 45 and the front bulging portion 50 of the joint portion 42 is wide. It enters the upper engagement holes 43 and the lower engagement hole 44.
When the rear bulge portion 45 of the rearward projecting engagement portion 41 and the front bulge portion 50 of the front projecting engagement portion 42 get over the lower arc surface 47 and the upper arc surface 52, the rear projecting engagement portion 41 faces downward. The 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 other hand, when the wire cable 56 is loosened and the lower engagement portion 55 of the elasticity adjustment plate 40 moves downward due to the elastic restoring force of the elasticity adjustment plate 40 itself, the weight of the cushioning material, etc., the downward arc of the rearward projecting engagement portion 41 Since the engagement surface 46 is in contact with the lower circular arc surface 47 of the upper engagement hole 43, the engagement portion between the rear protrusion engagement portion 41 and the rear bulge portion 45 is not disengaged, and the elasticity adjusting plate 40 moves backward. To do.
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.
Accordingly, 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 cable tip engagement body 61 of the wire cable 56 is inserted into the cable insertion groove 58 of the lower engagement portion 55. Since it is directly locked, it is not necessary to use a rod or bracket when installing the wire cable 56, 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, since the cushioning material 4 of the dorsal seat 2 is present 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.
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.
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.

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 Part, 67 ... upper side opening part, 68 ... fitting groove.

Claims (4)

A plate body 31 for supporting a load while elastically deforming a single plate-shaped synthetic resin capable of supporting the back of a seated person is supported on the dorsal frame 3 of the dorsal seat 2 via a wire spring 32. A plate-shaped support member 30 is configured to be movable back and forth with respect to the plate 3, and a single-plate elastic adjustment plate 40 made of synthetic resin and having elasticity is attached to the plate body 31. An engagement hole formed in the plate body 31 is provided at a predetermined position above the elasticity adjustment plate 40 so that the elasticity adjustment plate 40 can adjust the support elasticity of the seated person's body. A plurality of engaging portions that are engaged with each other are provided in the left-right direction, and the engaging portions are detachably engaged with the engaging holes so as not to move back and forth and up and down, and within a predetermined angle range after engagement. Elasticity adjustment plate Configuration the vehicle seat so 0 is rotated. A plate body 31 for supporting a load while elastically deforming a single plate-shaped synthetic resin capable of supporting the back of a seated person is supported on the dorsal frame 3 of the dorsal seat 2 via a wire spring 32. A plate-shaped support member 30 is configured to be movable back and forth with respect to 3, and the plate body 31 is provided with an elastic plate 40 made of a single-plate synthetic resin having elasticity with respect to the plate body 31. It is provided so as to move back and forth, and is configured to be able to adjust the support elasticity of the seated person's body by means of the elasticity adjusting plate 40. And a plurality of front projecting engaging portions 42 projecting forward are arranged in the left-right direction, and the rear projecting engaging portion 41 and the front projecting engaging portion 42 are formed with an upper engaging hole 43 formed in the plate body 31. Lower person Vehicle seat mounting is engaged respectively engaged in the holes 44.   In claim 1 or 2, the rear projecting engagement portion 41 is formed by forming a rear bulge portion 45 on the upper side, and forming a downward arc engagement surface 46 on the lower surface of the rear bulge portion 45, The front projecting engagement portion 42 is formed with a front bulging portion 50 on the rear side of the downward arc engaging surface 46 of the rear projecting engagement portion 41, and an upward arc engaging surface 51 is provided on the lower surface of the front bulging portion 50. The downward arc engagement surface 46 is formed on the lower arc surface 47 of the lower surface in the upper engagement hole 43 from the front side, and the upward arc engagement surface 51 is the upper arc of the upper surface in the lower engagement hole 44. A vehicle seat configured to be engaged with the surface 52 from the rear side.   In claim 3, the lower arc surface 47 of the upper engagement hole 43 and the upper arc surface 52 of the lower engagement hole 44 are located at a predetermined position between the upper arc surface 47 and the upper arc surface 52 in the vertical direction. The arcuate surface substantially coincides with the concentric circle having the center G, and the rear projecting engagement portion 41 and the front projecting engagement portion 42 are inserted into and engaged with the upper engagement hole 43 and the lower engagement hole 44. A vehicle seat arranged and configured so that the elasticity adjusting plate 40 can be rotated later with the center G as an axis.

Images