JP4540063B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat provided with a headrest that moves forward to support a head during a so-called “rear impact” in which a seated person moves backward due to inertia in response to a collision from the rear.

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

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

In the present invention, the headrest 6 is attached to the upper part of the dorsal seat 2 by the upper link 15 so as to be movable back and forth, and the plate body 31 formed in a substantially rectangular single plate shape is vertically mounted on the dorsal frame 3 of the dorsal seat 2. A plurality of the wire springs 34 arranged vertically are arranged as a rear collision detection spring 34B, and the rear collision detection spring 34B and the rear The plate body 31 in the vicinity of the collision detection spring 34B constitutes a rear collision detection section 40 that operates the upper link 15, and the mounting end 38 of the rear collision detection spring 34B is rotatable on the back frame 3. The lower link 35 is attached to the provided lower link 35, and the lower link 35 and the upper link 15 are connected by a transmission member 26, and at least the rear collision detection spring. Left and right tips of both sides of the attachment end 38 of the 34B is obtained by a vehicle seat is positioned forward s husband from the plan view the plate member 31.
In the present invention, the wire spring 34 is formed in a bent portion 41 whose middle portion is bent up and down by a single shaft rod member, and the bent portion 41 is attached to the plate body 31, The front ends of the attachment end portions 38 on both the left and right sides of the wire spring 34 projecting in the direction are vehicle seats positioned in front of the planar view plate body 31.
In the present invention, the plate body 31 is a vehicle seat positioned rearward of the front edge of the side frame 46 of the dorsal frame 3 in plan view.

In the first aspect of the present invention, the tips of the attachment end portions 38 on both the left and right sides of the wire spring 34 are positioned in front of the plate body 31 in plan view, and therefore, between the tip of the attachment end portion 38 and the plate body 31. The installation space in which the cushion material 4 can be installed can be widened, and the cushion performance can be improved.
In the invention of claim 2, the attachment of the wire spring 34 and the plate body 31 can be facilitated, and the mounting member for attaching the plate body 31 can be omitted to reduce the number of parts and the cost.
In invention of Claim 3, the installation space which can install the cushioning material 4 in the front side of the plate body 31 can be formed widely, and cushion performance can be improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 The outer periphery of 4 is surrounded by the skin member 5.
A headrest 6 is provided on the upper portion of the dorsal seat 2. The configuration of the headrest 6 is arbitrary, and includes at least a head support portion 7 that supports the head H of the seated person T and a pillar 8 that is attached to the dorsal seat 2.
The pillar 8 of the headrest 6 is attached to a pillar support member 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, the engagement member provided in the pillar support member 11 should just be engaged with the engagement recessed part formed in the pillar 8, and may be hold | maintained.

The left and right sides of the headrest mounting rod 10 are attached to the back frame 3 via upper links 15 that move the headrest 6 back and forth.
The upper link 15 is attached by a shaft 18 to a moving bracket 17 in which one end (rear end) of a first link rod 16 constituting a part of the upper link 15 is fixed to both left and right ends of the headrest mounting rod 10. The other end of the heel 16 is attached to a fixed bracket 19 provided on the upper left and right sides of the back frame 3 by a shaft 20 so as to be rotatable.
One end of the second link rod 23 is attached to the moving side bracket 17 below the first link rod 16 by a shaft 24. An intermediate portion of the second link rod 23 is rotatably attached to the fixed bracket 19 by a shaft 25.

The upper link 15 includes a first link rod 16, a moving bracket 17, and a second link rod 23.
An upper portion of a transmission member (rod) 26 is connected to the other end of the second link rod 23 by a shaft 27.
The lower end of the first link rod 16 is engaged with the other end of the spring 28 having one end locked on the back frame 3 side, and the upper link 15 is urged so that the headrest 6 is always located on the rear side. .

  Therefore, a plate-like support member 30 is provided on the dorsal frame 3 of the dorsal sheet 2. The plate-like support member 30 supports the back of the seated person T. The plate-like support member 30 supports the back of the seated person T with a “surface” to stabilize the seating posture, and also as a countermeasure against whiplash in which the headrest 6 moves forward to support the head H as will be described later. The head H is supported well.

  In other words, in the conventional zigzag spring configuration arranged vertically, the back of the seated person T is supported by “lines” by the zigzag springs that move backward due to the load. Even if the moving headrest 6 supports the head H, the back of the seated person T moves backward, and the positional relationship between the head H and the back becomes unstable. The entire back portion of the seated person T can be supported by the surface 30 by the material 30, and when the headrest 6 moving forward supports the head H, the plate-like support material 30 supports the back surface of the seated person T by “surface”. The seating posture of the seated person T including the head H is extremely stabilized.

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

Thus, the plate-like support member 30 is constructed by attaching the plate body 31 to the dorsal frame 3 via a wire spring 34 such as a zigzag spring or a formed wire spring so as to be movable back and forth. The seated person T is supported back and forth while maintaining the surface state.
In this case, the wire spring 34 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.

  The wire spring 34 has one end attached to the plate body 31 and the other end attached to the back frame 3. The wire spring 34 of the embodiment is formed by bending a single shaft bar-shaped intermediate portion, the intermediate portion is attached to the plate body 31, formed at the attachment end portions 38 at both ends thereof, and the attachment end portions 38 are formed. Install on the dorsal frame 3.

  Thus, a plurality of the wire springs 34 are arranged in the vertical direction, and one of the plurality of the wire springs 34B (in the embodiment, both ends of one wire spring 34B) has one end (or intermediate portion) as a plate. Although attached to the body 31, the attachment end 38 at the other end (or the tip) is directly attached to the tip of the rotating arm 36 of the lower link 35. The distal end of the attachment end portion 38 is formed in a U-shaped engagement portion 39, and the engagement portion 39 is attached by being engaged with an engagement hole 42 formed in the rotating arm 36.

That is, the engaging portion 39 is bent rearward so as to be laterally viewed from the side, and the engaging portion 39 is engaged so that the engaging hole 42 of the lower link 35 faces sideways, The lower link 35 is rotatably attached to the back frame 3 by a shaft 37 so that the engagement hole 42 is oriented vertically.
Therefore, the engagement between the engagement portion 39 and the engagement hole 42 is easy. When the lower link 35 is attached to the dorsal frame 3, the engagement portion 39 does not come off the engagement hole 42.

The base of the rotating arm 36 is rotatably attached to the back frame 3 by a shaft 37. The lower part of the transmission member 26 is attached to the distal end side of the rotating arm 36.
The wire spring 34 attached to the lower link 35 is a rear collision detection spring 34B, and the rear collision detection spring 34B transmits the rearward movement of the plate body 31 due to the backward movement of the seated person T to the lower link 35. This energy is transmitted to the upper link 15 via the transmission member transmission member 26, and the upper link 15 moves the headrest 6 forward by the transmission energy of the transmission member transmission member 26 to move the head H of the seated person T. To support.

Therefore, the plate body 31 between the portion to which the left and right rear collision detection springs 34B are attached and the vicinity thereof is formed in the rear collision detection section 40 that moves backward by the backward movement of the seated person T collided from behind (see FIG. 3, FIG. 4).
That is, the lower link 35 is normally fixed without being rotated by the spring 28 provided on the upper link 15, so that the attachment end portion 38 portion of the rear collision detection spring 34 B attached to the plate body 31 is elastically deformed. Then, the plate-like support member 30 is moved back and forth while maintaining the surface state.

  When the plate body 31 is subjected to a load more than that set by the spring 28 and the plate body 31 is moved backward, the rear collision detection spring 34B rotates the lower link 35 to transmit the transmission member. The headrest 6 is moved forward through the upper link 15 and the upper link 15, and the portion of the plate body 31 to which the rear collision detection spring 34 </ b> B is attached becomes the rear collision detection unit 40.

  In the embodiment, the plate body 31 is attached to the back frame 3 by a pair of upper and lower wire springs 34. The lower wire spring 34 of the upper and lower wire springs 34 is used as a rear collision detection spring 34B. A lower part of the body 31 is formed in the rear collision detection unit 40.

  The rear impact detection unit 40 is provided with the plate-like support member 30 on the back frame 3, so that the rear impact detection spring 34 </ b> B is attached to any part of the plate-like support member 30 from the upper end to the lower end. When the sensing spring 34B is attached to the link (the lower link 35), the rear collision detection unit 40 can be formed and the rear collision can be detected. However, the rear link 35 rotates large in the vicinity of the waist of the seated person. Therefore, when the rear collision detection unit 40 is provided at the upper side, the plate-like support member 30 of that portion is moved backward by a predetermined amount, and the back of the seated person T is supported. If the vicinity of the lumbar region is formed in the rear impact detection unit 40 for reasons such as a shortage of the seat, the support of the seated person T by the plate-shaped support member 30 and the certainty of detection of the rear impact by the rear impact detection unit 40 And is suitable.

  Thus, the wire spring 34 is formed by a single axial member, and the middle portion of the left and right end portions of the wire spring 34 is formed in a bent portion 41 that is appropriately bent in the vertical direction, and a predetermined portion of the bent portion 41 is formed. Is attached to the rear surface of the plate body 31 by any means, and the bent portion 41 itself supports the plate body 31 in a surface state, which is preferable because the plate body 31 can favorably support the seated person.

  In this case, the plate body 31 is located on the rear side of the front edge of the side frame 46 of the dorsal frame 3, and the intermediate portion of the wire spring 34 (including the rear collision detection spring 34 </ b> B) is located behind the plate body 31. Although it is located on the side, the attachment end 38 of the wire spring 34 protrudes forward in plan view, and the tip of the attachment end 38 is attached to the side frame 46 or the lower link 35 to secure the front-rear width of the cushion material 4. To improve the seating feeling.

  Accordingly, the rotation arm 36 of the lower link 35 is provided with a stopper mechanism 43 that restricts the rotation of the rotation arm 36 (FIG. 2). The stopper mechanism 43 forms a guide groove 44 in one of the rotating arm 36 and the back frame 3 and engages with the guide groove 44 in the other of the rotating arm 36 and the back frame 3. A member 45 is provided and configured.

  In the embodiment, a guide groove 44 is formed in the pivot arm 36 in the dorsal frame 3, and a pin-shaped engagement member 45 fixed to the pivot arm 36 is engaged in the guide groove 44. The engaging member 45 is engaged with the lower edge of the groove 44, and the backward movement of the headrest 6 by the spring 28 is stopped at a predetermined position.

(Operation of Example)
A plate-like support member 30 is provided on the dorsal frame 3 of the dorsal seat 2, and the plate-like support member 30 is formed on the dorsal frame 3 via a wire spring 34 and a plate body 31 formed in a substantially rectangular single plate shape. Since the plate-like support member 30 is configured so as to be movable back and forth, when the seated person T is seated, the plate-like support 31 is moved to the rear as it is and supported by the rearward movement. It is supported by moving back and forth with respect to the dorsal frame 3 in the state.

Therefore, the seating feeling is greatly improved as compared with the conventional zigzag spring configuration in which the upper and lower sides are arranged side by side and supported by “lines”.
In 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.

  Since at least the upper and lower wire springs 34A and 34B (34B) are arranged side by side, the wire spring 34 is arranged in one piece by the upper and lower wire springs 34A and 34B. The plate body 31 of the plate-like plate-like support member 30 is supported at least at four positions, up and down, left and right, and supports the seat occupant T in a surface state.

  Also, the upper wire spring 34A of the wire spring 34 is attached to the dorsal frame 3 with its left and right ends fixed, and its middle part is formed in a bent part 41 bent appropriately in the vertical direction. This prevents the plate-like support member 30 and the wire spring 34 from being displaced and acts so that the plate-like support member 30 supports the load in a surface state.

Thus, the back frame 3 is provided with a rear collision detection unit 40 that moves backward due to the backward movement of the seated person T collided from behind, and a transmission member 26 that transmits the rear movement of the rear collision detection unit 40. Since the upper end of the transmission member 26 is attached to the second link rod 23 of the upper link 15, the transmission member 26 is pulled downward by the rearward movement of the rear collision detection unit 40, and the transmission member transmission member 26 is connected to the upper link 15. The second link rod 23 is rotated downward about the shaft 25, the second link rod 23 pushes up the shaft 24 obliquely forward, the shaft 24 pushes up the moving side bracket 17, and the moving side bracket 17 pushes the pillar 8 of the headrest 6. The headrest mounting rod 10 attached with the pillar support member 11 to be supported is pushed up obliquely forward, whereby the headrest 6 moves forward.
Therefore, the headrest 6 is rotated forward by the upper link 15 to support the head H, and has a whiplash prevention effect.

  Accordingly, any one of the plurality of wire springs 34 arranged in the vertical direction is attached to the tip of the rotating arm 36 of the lower link 35 to form a rear collision detection spring 34B, and a plate between the rear collision detection springs 34B. Since the body 31 is formed in the rear collision detection unit 40, when the plate body 31 is moved backward by a predetermined amount due to the backward movement of the seated person T, the rear collision detection spring 34B is moved backward, and the rear collision detection spring 34B is The lower link 35 is rotated downward against the spring 28, the lower link 35 rotates the upper link 15 via the transmission member 26, the upper link 15 moves the headrest 6 forward, and the seater T Support the head H.

  Therefore, since the plate body 31 of the part to which the rear collision detection spring 34B is attached is formed in the rear collision detection unit 40 that moves backward by the backward movement of the seated person T collided from behind, the rear body of the seated person T Since the rearward movement of the plate body 31 due to the movement is transmitted directly to the upper link 15 via the lower link 35 and the transmission member 26, the load (inertia) transmission efficiency is good and the operation is ensured.

Further, since a part of the plate body 31 is also used as a part of the rear collision detection mechanism, it is not necessary to provide a rear collision detection mechanism separately, the number of parts can be reduced, the assembly can be facilitated, and the weight can be reduced.
In this case, the wire spring 34 may be provided below the rear collision detection spring (lower wire spring) 34B.

  Accordingly, the lower link 35 is normally urged by the spring 28 provided on the upper link 15 so as to always rotate upward, so that the rear collision detection unit 40 is fixed to the left and right rear collision detection springs 34B. If the load is weaker than the elasticity of the spring 28, the rear collision detection spring 34B is elastically deformed and the plate-like support member 30 is moved back and forth while maintaining the surface state.

  When the plate body 31 is moved backward with a load more than that set by the spring 28, the rear collision detection spring 34B rotates the lower link 35. Therefore, the rotation of the lower link 35 and the transmission member 26 are rotated. It is transmitted to the headrest 6 via the upper link 15 and moved forward.

  In this case, a pair of upper and lower wire springs 34 are provided on the plate body 31. The lower wire spring 34 in the upper and lower wire springs 34 is used as a rear collision detection spring 34B, and the lower portion of the plate body 31 is used as a rear part. Since it is formed in the collision detection unit 40, the vicinity of the waist of the seated person having a large rearward movement amount can be configured as the rear collision detection unit 40, and the rear collision can be reliably detected.

  Further, if the rear impact detection unit 40 is provided on the upper portion of the plate body 31, the plate-like support member 30 at that portion is moved further rearward than the normal support position, thereby supporting the back of the seated person T. However, in this application, since it is provided in the lower part of the plate body 31, the back of the seated person T is favorably supported.

  That is, in the zigzag spring supported by the “line”, even if the head H is supported by the headrest 6 that moves forward in the case of a rear collision, the support of the back of the seated person T becomes unstable and the position of the head H and the back In the present application, the entire back portion of the seated person T is supported by the “plane” by the plate-like support member 30, so that the head H and the seating are combined with the headrest 6 that moves forward. The back of the person T can be favorably supported, and the sitting posture of the person T including the head H is extremely stabilized.

  In addition, since the upper edge of the plate body 31 of the plate-like support member 30 is positioned behind the chest of the average seated person T, the plate body 31 reliably supports the vicinity of the chest, which is a portion that does not change in the sitting posture. Thus, the headrest 6 can be moved forward, and the head H is favorably supported without changing the positional relationship between the head H and the back (chest).

  In addition, since the plate body 31 moves backward due to the inertia of the rear collision, there is no inconvenience even if the plate body 31 is provided with the rear collision detection unit 40. It is possible to achieve both the reliability of the detection of the rear collision by the detection unit 40 and an extremely rational configuration.

  Thus, the lower wire spring 34 among the plurality of wire springs 34 arranged side by side is used as a rear impact detection spring 34B, and the lower portion of the plate body 31 is formed in the rear impact detection portion 40, and each attachment of the wire spring 34B is performed. Since the engaging portion engaging portion 39 is formed at the tip of the end portion 38 and the engaging hole 42 is formed at the tip of the rotating arm 36 of the lower link 35, the attachment of the rear collision detection spring 34B is performed. The end portion 38 can be directly attached to the tip end of the rotating arm 36, so that no mounting parts are required, and the weight can be reduced.

Further, the attachment end portion 38 of the rear collision detection spring 34B is simply engaged with the engagement hole 42 at the distal end of the rotating arm 36, and the attachment operation can be completed easily.
Further, since the engaging portion 39 of the attachment end portion 38 is formed by bending backward and the engaging hole 42 is formed in a vertically long shape, the engaging hole 42 with respect to the moving direction of the engaging portion 39. Is in the crossing direction, and the engagement between the engagement portion 39 and the engagement hole 42 is not disengaged even when the rear impact detection portion 40 of the plate-like support member 30 moves back and forth.

  The intermediate portion of the wire spring 34 (including the rear collision detection spring 34B) is located on the rear side of the plate body 31, and the attachment end portion 38 of the wire spring 34 is forward of the plate body 31 in plan view. Since it protrudes and the tip of the attachment end portion 38 is attached to the side frame 46 or the lower link 35, a predetermined space can be secured in front of the plate body 31, so that the front and rear width of the cushion material 4 can be increased. Can improve the seating feeling.

  Further, since the attachment end portion 38 is elastically deformed with the attachment portion between the attachment end portion 38 and the side frame 46 or the lower link 35 as a fulcrum, the cushioning material 4 is favorably supported by the plate body 31 and is cushioned. Can be improved.

  Thus, since the rotation arm 36 of the lower link 35 is provided with a stopper mechanism 43 that restricts the rotation of the rotation arm 36, it is coupled with the spring 28 that biases the upper link 15. The headrest 6 is always located at a predetermined position.

That is, normally, the engaging member 45 is engaged with the lower edge of the guide groove 44, and the backward movement of the headrest 6 by the spring 28 is stopped at a predetermined position.
Further, since the guide groove 44 and the engaging member 45 of the stopper mechanism 43 restrict the turning direction of the turning arm 36, even if the lower part of the plate body 31 is formed in the rear collision detection unit 40 by the wire spring 34B. The rear collision detection unit 40 can move smoothly and reliably detect the rear collision.

  Although there is a so-called lumbar support mechanism that adjusts the support force of the cushion material 4, the lumbar support body is urged so as to always move forward with respect to the dorsal frame. Since it is supported by the support mechanism and the lumbar support body does not move backward, it is impossible to detect a rear collision. In this regard, since the plate body 31 of the present application can move back and forth with respect to the dorsal frame 3, the plate body 31 moves backward due to the inertia of the rear collision, and it is inconvenient to provide the rear collision detection unit 40 on the plate body 31. It is different from the lumbar support body of the lumbar support mechanism.

The perspective view of a dorsal fin seat and a headrest. FIG. The perspective view of a dorsal fin seat frame. The perspective view of an up-down link mechanism. FIG. 3 is a schematic side view of a seated person's skeleton and dorsal seat frame. The operation state side view of a rear collision detection part. The attachment state perspective view of a wire spring. Sectional drawing of a dorsal fin sheet.

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, 16 ... first link rod, 17 ... moving side bracket, 18 ... shaft, 19 ... fixed side bracket, 20 ... shaft, 23 ... second link rod, 24 ... shaft, 25 ... shaft, 26 ... transmission member , 27 ... shaft, 28 ... spring, 30 ... plate-like support material, 31 ... plate body, 34 ... wire spring (34B ... spring for detecting rear collision), 35 ... lower link, 36 ... rotating arm, 37 ... shaft , 38 ... attachment end, 39 ... engagement part, 40 ... rear collision detection part, 41 ... bending part, 42 ... engagement hole, 43 ... stopper mechanism, 44 ... guide groove, 45 ... engagement member.

Claims (3)

The headrest 6 is attached to the upper part of the dorsal seat 2 so as to be movable back and forth by the upper link 15, and a plurality of plate bodies 31 formed in a substantially rectangular single plate shape are arranged in parallel on the dorsal frame 3 of the dorsal seat 2. One of the plurality of wire springs 34 arranged in parallel vertically is used as a rear impact detection spring 34B, and the rear impact detection spring 34B and the rear impact detection spring are attached. A rear collision detection unit 40 for operating the upper link 15 is constituted by a plate body 31 in the vicinity of 34B, and a mounting end 38 of the rear collision detection spring 34B is provided on the lower back frame 3 so as to be rotatable. The lower link 35 and the upper link 15 are connected to each other by a transmission member 26, and at least the rear collision detection spring 34B is attached to the link 35. Right sides of the tip of the attachment end portion 38, a vehicle seat which is positioned forwardly s husband from the plan view the plate member 31. 2. The wire spring according to claim 1, wherein the wire spring is formed in a bent portion 41 having an intermediate portion bent upward and downward by a single shaft rod member, and the bent portion 41 is attached to the plate body 31. The front ends of the attachment end portions 38 on the left and right sides of the wire spring 34 projecting sideways are vehicle seats positioned in front of the planar view plate body 31. 3. The vehicle seat according to claim 2, wherein the plate body 31 is positioned rearward of a front edge of the side frame 46 of the dorsal frame 3 in plan view.

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