WO2006008834A1

WO2006008834A1 - Seat back for automobile

Info

Publication number: WO2006008834A1
Application number: PCT/JP2004/013328
Authority: WO
Inventors: Nobuyuki Nakano
Original assignee: Johnson Controls Technology Company
Priority date: 2004-07-21
Filing date: 2004-09-13
Publication date: 2006-01-26
Also published as: JP4369817B2; JP2006027574A

Abstract

A seat back for an automobile capable of holding the position of a head rest when the head rest is moved forward by a secondary collision load, wherein a lock member (31) supported to be vertically moved along a pressure receiving member (30) and an energizing means (33) always energizing the lock member (31) downward are fitted to the pressure receiving member (30). Since any of lock teeth (34) in a stepped state formed in the lock member (31) is always engaged with the engagement part (14) of an upper cross member (10), the pressure receiving member (30) is held on the upper cross member (10).

Description

Specification

Automotive seat back

Technical field

TECHNICAL FIELD [0001] The present invention relates to an automobile seat back, and more particularly to an automobile seat back structure for protecting a occupant's cervical spine when the own vehicle is collided with another vehicle.

Background art

[0002] As a conventional seat back of such an automobile, for example, a lateral frame member having a rotation hinge is provided on the front side of the upper end portion of the side frame, and a pressure receiving portion is provided in association with the rear impact. For this reason, for example, when the host vehicle is collided, an impulsive load (referred to as primary collision) is first applied to the seat back, and then the passenger seated on the seat back. The reaction load due to (called secondary collision) acts toward the rear side. That is, the reaction load acts on the pressure receiving portion. At this time, the pressure receiving part moves rearward, so that the headrest holder rotates forward about the front rotating hinge, and the headrest supported by the headrest holder moves to the head equivalent part of the occupant. Thus, the headrest operates in a direction approaching the passenger's head.

[0003] Therefore, even when the own vehicle is collided, even if the seat back leans backward due to the reaction load of the own vehicle occupant, the pressure receiving portion instantaneously turns the headrest according to the seesaw principle due to the reaction load. The head of the occupant is reliably received by the headrest and the cervical spine of the occupant is protected (for example, Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 10-119619

Disclosure of the invention

Problems to be solved by the invention

[0004] However, in such a conventional technique, the headrest has moved to the front side because of the seesaw principle by the secondary collision load by the occupant applied to the pressure receiving portion. If it disappears, the headrest will try to return to the rear again and will not hold the passenger's head. Depending on the timing, a rotating hinge is provided on the front side of the headrest, so when the seat back is pressed from the front side, there is a rotating hinge. Will be caught as a foreign object. In addition, since the upper part of the headrest holder is tilted forward, it can easily interfere with the occupant's shoulder, and the movement of the headrest holder can be stopped by the shoulder, etc. It has been demanded.

[0005] The present invention has been made by paying attention to such a conventional technique. When the headrest moves to the front side due to a secondary collision load, the headrest can be maintained and the headrest can be moved to the front side. A vehicle seat back that aims to allow the headrest to move forward by the amount pushed by the pressure-receiving part, even when the rotational center position during movement is not given to the occupant as a foreign object sensation. It is.

Means for solving the problem

[0006] In order to solve the powerful conventional technique, the invention according to claim 1 includes a side frame disposed on both right and left side portions and an upper opening member formed between the upper end portions of the side frame. A seat back frame configured at least; a headrest support member that is disposed on the rear side of the upper cross member and is rotatably supported between the upper ends of the side frames; and a substantially center of the headrest support member A pressure receiving member in which a pressure receiving portion supported by the lower end portion is disposed at a position where the upper end portion is supported by the portion and can receive an impact load accompanying a rear-end collision, and a headrest holder supported by the headrest supporting member And at least a headrest that is supported by the headrest holder so as to be movable up and down. A locking member that is supported so as to be movable up and down along the member; and an urging means that constantly urges the locking member downward; and a step-like locking tooth formed on the locking member. Any one of them is always engaged with the engaging portion of the upper cross member, whereby the pressure receiving member is held by the upper cross member.

[0007] The invention according to claim 2 is the automobile seat back according to claim 1, wherein the lock member is provided with release means that can be lifted upward against the biasing means. It is characterized by becoming.

[0008] The invention according to claim 3 is the automobile seat back according to claim 1 or claim 2, wherein the engaging portion of the upper cross member is formed on a member below the upper cross member. It is formed by a notch formed. [0009] The invention according to claim 4 is the vehicle seat back according to any one of claims 1 to 3, wherein the lock member is provided along the pressure receiving member. A sliding portion is formed, and the pressure receiving member is supported by a supporting member that engages with the sliding portion and can slide the lock member up and down.

[0010] The invention according to claim 5 is the automobile seat back according to any one of claims 1 to 4, wherein the pressure receiving portion of the pressure receiving member is always urged forward. At the same time, it is characterized by comprising a return spring for an active headrest that does not extend with a seating load and can only be extended with an impact load accompanying a rear-end collision.

[0011] The invention according to claim 6 is the vehicle seat back according to any one of claims 1 to 5, wherein the urging means is configured such that the pressure receiving member is bent forward. It is characterized by being arranged in an arc shape in the part.

The invention's effect

[0012] According to the invention described in claim 1, the pressure receiving member includes a lock member that is supported so as to be movable up and down along the pressure receiving member, and an urging force that constantly biases the lock member downward. The stepped lock teeth formed on the lock member are always engaged with the engagement portion of the upper opening member so that the pressure receiving member is held by the upper cross member. Therefore, when the headrest moves to the front side due to the secondary collision load, the position of the headrest can be maintained by engaging the lock teeth of the lock member with the engaging portion of the upper cross member. Further, since the center of rotation of the headrest is on the side frame side, the position of the center of rotation when the headrest moves to the front side is not given to the occupant as a foreign object sensation. Furthermore, the headrest can move forward by the amount pushed by the pressure receiving portion, and the occupant's neck can be securely held.

[0013] According to the invention described in claim 2, the lock member is provided with release means that can be lifted upward against the biasing means, thereby engaging the upper cross member. It is possible to release the engagement between the portion and the lock tooth.

[0014] According to the invention of claim 3, since the engaging portion of the upper cross member is formed by the notch formed in the lower member of the upper opening member, the strength of the notch is increased. The notch is urged by the urging means when the locking teeth of the locking member are engaged with the notch. If it is done, it will not be deformed.

[0015] According to the invention of claim 4, the lock member is formed with a slide portion that allows the lock member to slide along the pressure receiving member, and the pressure receiving member includes the slide portion. Since the support member that can be engaged and slid up and down is supported, the lock member can be moved along the pressure-receiving member regardless of the direction of the pressure-receiving member, even if the pressure-receiving member is rotated by the rear-end collision. Will be able to slide reliably.

[0016] According to the invention of claim 5, the pressure receiving portion of the pressure receiving member is always urged to the front side and does not expand with a seating load, but can only expand with an impact load accompanying a rear-end collision. Because the active headrest return spring is interposed, the active headrest return spring does not extend in response to the backrest load caused by the back of the occupant when the occupant is sitting normally. Can be held. In addition, when a load due to a secondary collision due to a rear-end collision is applied, it is possible to expand, so that the pressure-receiving portion does not hinder the movement and can move reliably.

[0017] According to the invention of claim 6, the urging means is arranged in an arc shape in a portion where the pressure receiving member is bent forward, so that the lock teeth of the lock member are upper cross. The member is biased in a direction to be surely engaged with the engaging portion of the member, so that the certainty of the engagement can be achieved. Brief Description of Drawings

FIG. 1 is a side view showing a seat provided with a seat back according to an embodiment of the present invention.

FIG. 2 is a front view showing a seat back frame of the seat back of FIG.

FIG. 3 is a perspective view of FIG. 2.

FIG. 4 is a perspective view showing the main part of FIG.

FIG. 5 is a cross-sectional view taken along line SA-SA in FIG.

Explanation of symbols

[0019] 1 seat back

2, 2, side frame

3 Headrest

4 Seat back frame 7 Headrest support member

10 Uppa cross member

10a Lower part

12 Return spring for active headrest

13 Headrest stay

14 Engagement part

22 Headrest Honoreda

30 Pressure receiving member

30a Upper end of pressure receiving member

30b Lower end of pressure receiving member

31 Locking member

32 Pressure receiver

33 Coil spring as biasing means

34 lock teeth

35 S-shaped spring

36 Release means

36a Operation unit

37 Slide part

38 Support member

FR front

RR rear side

UP upper side

LWR lower side

BEST MODE FOR CARRYING OUT THE INVENTION

When the headrest moves to the front side due to a secondary collision load, the pressure receiving member is a lock that is supported so that it can move up and down along the pressure receiving member for the purpose of providing a seat back for automobiles. Member and a biasing means that constantly biases the lock member downward, and any one of the step-like lock teeth formed on the lock member is open. This is realized by the fact that the pressure receiving member is held by the upper cross member by being always engaged with the engaging portion of the upper cross member. Hereinafter, preferred embodiments of the present invention will be described.

Example 1

1 to 5 show an embodiment of the present invention. Reference numeral 1 denotes a vehicle seat back, and reference numeral 3 denotes a headrest. Note that FR is the front side, RR is the rear side, UP is the upper side, and LWR is the lower side. The seat back 1 is supported by a seat cushion 8 via a reclining device 9.

[0022] The seat back 1 includes a seat back frame 4 having at least side plates 2, 2 'made of iron plates on both sides, and upper ends 2a, 2 of the side frames 2, 2 of the seat back frame 4. 'A steel plate headrest support that is rotatably mounted on the front and rear FR and RR with a stepped bolt 5 between the rear RR of a and a bush (not shown) for absorbing rubbing noise and shock during rotation. A plate-like pressure receiving member 30 having a member 7 and an upper end 30a supported on the headrest supporting member 7 by welding GW and a pressure receiving portion 32 arranged on a lower end 30b capable of receiving a secondary impact load accompanying a rear-end collision. And synthetic resin headrest holders 22 and 22 engaged with through-holes 6 and 6 formed in the headrest support member 7 and supporting the headrest 3.

[0023] The seat back frame 4 is an upper cross member that is installed substantially horizontally between the side frames 2, 2, and the front FR of the upper ends 2a, 2'a of the side frames 2, 2,. 10 and a lower cross menno 11 that is substantially horizontally installed on the lower ends 2b and 2'b of the side frames 2 and 2 ', and the side frames 2 and 2, the upper cross member 10 and the lower cross member 11 Are supported by welding to each other.

[0024] Between the side frames 2 and 2 ', as shown in Fig. 3, there is a spring constant that does not expand with a load during normal use but can be expanded only with a secondary impact load accompanying a rear-end collision. An active headrest return spring 12 is engaged with through holes 12a and 12a formed in the side frames 2 and 2, respectively. In addition, between the side frames 2 and 2 ', as shown in Fig. 3, there are S-shaped springs 35 and 35 with a spring constant that can be held with a load during normal use. 2 and 2 'clips 17 (however, in FIG. Lip 17 is not visible by side frame 2. ).

The pressure receiving portion 32 of the lower end portion 30b of the pressure receiving member 30 is formed with a locking portion 39, and the pressure spring 32 is engaged with the return spring 12 so that the pressure receiving portion 32 is engaged. Is always energized by the front FR.

[0026] As shown in Fig. 4, the headrest support member 7 has an upper surface portion 7a that extends horizontally from side to side having an upper and lower through hole 6 through which an upper end portion of a hollow headrest holder 22 is inserted. And a rear surface portion 7b that hangs down from the rear end portion of the upper surface portion 7a along the surface of the rear side RR of the headrest holder 22, and is bent at a right angle. A lower end portion of the rear surface portion 7b is formed with a stubbing portion 7c that hangs further downward at a position separated from a lower member 10a of the upper cross member 10 described later. As shown in FIG. 4, the left and right ends of the rear surface portion 7b have intervening portions 7d and 7d formed by bending the front side FR, respectively.

As shown in FIG. 5, the upper cross member 10 has a U-shaped cross section in which the front side FR is closed and the rear side RR is opened, and the lower member 10a remains as it is in the headrest holder 22 as it is. When the headrest support member 7 is rotated along the rear side RR and the headrest support member 7 is rotated to the rear side RR, the stopper portion 7c of the headrest support member 7 hits against the stopper to prevent the headrest support member 7 from rotating. Surface 10b is formed.

[0028] Stays 13 and 13 of the headrest 3 are inserted and supported in the headrest holders 22 and 22 so as to be movable up and down. Further, the pressure receiving portion 32 is formed so that the position where the pressure receiving portion 32 is disposed is in the vicinity of the back portion of the occupant (not shown) and close to the front FR. The stay 13 of the headrest 3 is formed so as to be lifted up to a predetermined position UP so as to avoid the portion corresponding to the shoulder of the occupant, and then tilted toward the front FR!

[0029] A lock member 31 is supported on the upper end 30a of the pressure receiving member 30 so as to be movable up and down along the pressure receiving member 30, and the lock member 31 is always urged to the lower LWR. The pressure receiving member 30 is provided with a coil spring 33 which is an “urging means” arranged in an arc shape at a portion bent to the front FR, and a step-like lock formed on the lock member 31 One of the teeth 34 is always engaged with the engaging portion 14 formed on the lower member 10a of the upper cross member 10, so that the pressure receiving member 30 is held on the upper cross member 10. It is held. Reference numeral 36 denotes release means provided in the lock member, and the release means 36 is provided on the outer side of the seat knock 1 so that it can be lifted up against the coil spring 33. Is exposed. As shown in FIG. 4, the coil spring 33 is suspended between a rod-shaped first fixed portion 25 supported by the pressure receiving member 30 and a U-shaped second fixed portion 26 supported by the lock member 31. Has been. Therefore, in the state of FIG. 4 in which the lock teeth 34 are not engaged with the engaging portions 14, the lock member 31 must originally be in the lowest position due to the urging force of the coil spring 33. It is in the highest position.

[0030] The lock member 31 is formed by a flat plate portion 3la along the upper end portion 30a of the pressure receiving member 30, and flange portions 31b and 31b that are erected from the left and right end portions of the flat plate portion 31a. The lock teeth 34 are formed at the lower ends of the flange portions 31b and 31b. The flange portions 31b and 31b are formed with a slide portion 37 that penetrates from side to side and is a long hole along the pressure receiving member 30. Support members 38, 38 that support the lock member 31 so as to be slidable along the pressure receiving member 30 by engaging with the slide portion 37 are supported on the pressure receiving member 30 at a distance.

The engaging portion 14 formed on the lower member 10 a of the upper cross member 10 is formed by a notch formed on the lower member 10 a of the upper cross member 10.

Next, the operation according to this embodiment will be described.

[0033] In a driving state where an occupant (not shown) sits on the seat cushion 8 and does not lean his back on the seat back 1, there is a gap between the head of the occupant and the headrest 3. A gap is also formed between the back and the pressure receiving part 32. However, a pad, a skin member, etc. (not shown) are interposed between the back of the occupant and the pressure receiving portion 32. Occupant force when seated on the seat cushion 8 When the driver leans on the seat back 1 in a relaxed state, the pad and the S-shaped spring 35 stagnate due to the load held from the back of the occupant. Since it can move to the side RR, it is in a state where the back of the passenger can be received softly. Accordingly, the seating feeling is good. Of course, no load is applied to the pressure receiving portion 32.

[0034] In this state, if the vehicle is impacted and an impact load (referred to as primary collision) is applied, A load (referred to as a secondary collision) that is moved to the rear RR is applied to the member. Since the impact value resulting from the secondary collision is equal to or greater than the load at which the active headrest return spring 12 starts to expand, the pressure receiving portion 32 is moved to the rear RR, so that the return spring for the active headrest is returned. 12 starts to expand, the pressure receiving member 30 having the pressure receiving portion 32 starts to rotate to the rear side RR, and the headrest support member 7 supporting the pressure receiving member 30 is moved to the front FR around the stepped bolt 5 and the bush. Rotate. Thus, by rotating the headrest support member 7, the headrest 3 is moved through the stays 13 and 13 held in the headrest holders 22 and 22 supported by the headrest support member 7 in the position indicated by the solid line in FIG. As a result, the occupant's head can be securely held and the neck can be protected.

[0035] When the headrest 3 moves to the front side FR due to the secondary collision load, a gap is formed between the upper end portion 30a of the pressure receiving member 30 and the engaging portion 14 formed on the lower member 10a of the upper cross member 10. As a result, the lock member 31 is moved by being biased to the lower LWR by the coil spring 33. Then, any of the lock teeth 34 of the lock member 31 engages with the engagement portion 14 of the upper cross member 10 (two-dot chain line in FIG. 5), so that the headrest 3 can be held at the position moved to the front FR. .

[0036] Further, since the center of rotation of the powerful headrest 3 is on the interposition part 7d side provided on the side frames 2, 2, the foreign object feeling is not given even if the stepped bolt 5 is provided. Become. In addition, when a load due to a secondary collision of the occupant is applied to the pressure receiving part 32, it rotates around the upper ends 2a, 2'a of the side frames 2, 2 ', so that it does not interfere with the shoulder of the occupant. Therefore, the headrest 3 can be moved to the front FR, and the occupant's neck can be securely held.

[0037] Further, the lock member 31 is provided with a release means 36 that can be lifted up against the coil spring 33 so that the lock member 31 and the engaging portion 14 of the upper cross member 10 can be locked. It is possible to disengage the teeth 34.

[0038] Since the engaging portion 14 of the upper cross member 10 is formed by a notch formed in the lower member 1 Oa of the upper cross member 10, the strength of the notch is improved, and the lock member 3 When the lock tooth 34 of 1 is engaged with the notch, the notch is biased by the coil spring 33. However, it will not be deformed.

[0039] The lock member 31 is formed with a slide portion 37 that allows the lock member 31 to slide along the pressure receiving member 30, and the pressure receiving member 30 is engaged with the slide portion 37. Since the support member 38 that can slide the lock member 31 up and down is supported, even if the pressure receiving member 30 is rotated by the rear-end collision, no matter where the pressure receiving member 30 is oriented, the pressure receiving member 30 can be moved along the pressure receiving member 30. The lock member 31 can be slid reliably.

[0040] The pressure receiving portion 32 of the pressure receiving member 30 is urged by the front FR at all times and does not extend with a seating load, but via an active headrest return spring 12 that can be extended only with an impact load accompanying a rear-end collision. Therefore, when the occupant is normally seated or relaxed, the active headrest return spring does not extend corresponding to the backrest load caused by the occupant's back, and the back can be held. Further, when a load due to a secondary collision due to a rear-end collision is applied, the return spring for the active headrest can be extended, so that the pressure receiving portion 32 is not hindered and can be moved reliably.

[0041] Since the coil spring 33 is arranged in an arc shape in a portion where the pressure receiving member 30 is bent to the front FR, the lock teeth 34 of the lock member 31 are connected to the engaging portion 14 of the upper cross member 10. By being urged in the direction of reliable engagement, the certainty of engagement can be achieved.

[0042] Even if the active headrest return spring 12 is rubbed between the pressure receiving portion 32 and the pressure receiving member 30 is rotated in any way, the active headrest return spring 12 is caused to move by the locking portion 39. Since it is supported, it is surely prevented from coming off.

[0043] Thus, the occupant's back is moved to the rear RR due to the impact, so that the occupant's head, which should be left behind, is securely held by the movement of the headrest 3. .

[0044] Further, since the side frames 2, 2, the upper cross member 10 and the lower cross member 11 form a square, the strength of the seat back 1 is remarkably improved, and the pressure receiving portion 32 for receiving the secondary collision is received. The headrest support member 7 that supports the head is not hindered by deformation. Industrial applicability

[0045] In the above description of operation, when the head of the occupant is securely held by the movement of the headrest 3, However, the movement of the headrest 3 and the movement of the seat back 1 are relative, and even if the seat back 1 is moved to the rear RR by the occupant's back, the headrest 3 moves relative to the occupant's head. It is later explained that 3 is not moved and is held in that position, so that the occupant's head is protected.

In the above embodiment, the force described as the headrest for automobiles is not limited to this, and vehicles such as railway vehicles and ships may be used.

Claims

The scope of the claims

[1] A seat back frame comprising at least a side frame arranged on both right and left sides and an upper cross member constructed between upper ends of the side frames, and a rear side of the upper cross member. And a headrest support member that is rotatably supported between the upper end portions of the side frames, and the upper end portion is supported at a substantially central portion of the headrest support member and can receive an impact load accompanying a rear-end collision. A pressure receiving member having a pressure receiving portion supported at the lower end at a position, a headrest holder supported by the headrest supporting member, and a headrest supported by the headrest holder so as to be movable up and down. And

The pressure receiving member includes a lock member that is supported so as to be movable up and down along the pressure receiving member, and an urging means that constantly urges the lock member downward,

One of the step-like lock teeth formed on the lock member is always engaged with the engagement portion of the upper cross member, so that the pressure receiving member is held by the upper cross member. A seat back for automobiles.

[2] The vehicle seat back according to claim 1,

The vehicle seat back according to claim 1, wherein the lock member includes release means that can be lifted up against the biasing means.

[3] The vehicle seat back according to claim 1 or claim 2,

The engagement part of the upper cross member is formed by a notch formed in a member on the lower side of the upper cross member.

[4] The vehicle seat back according to any one of claims 1 to 3, wherein the lock member is formed with a slide portion that allows the lock member to slide along the pressure receiving member. Become

A seat back for an automobile, wherein the pressure receiving member is supported by a support member that engages with the slide portion and can slide the lock member up and down.

[5] The vehicle seat back according to any one of claims 1 to 4, wherein the pressure receiving portion of the pressure receiving member is always urged forward and does not expand with a seating load. Active headrest return sp that can be extended only by impact load accompanying rear-end collision An automobile seat back characterized by comprising a ring.

The automobile seat back according to any one of claims 1 to 5, wherein the urging means is arranged in an arc shape at a portion where the pressure receiving member is bent forward. A featured automotive seat back.