JP2002283893A - Seat back frame in vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat back frame in a vehicular seat equipped with a three point support seat belt where strong rigidity to withstand shock load imposed on a tower frame is maintained by lowering the center of gravity, weight reduction is promoted, and a recliner is mounted in a simple, and speedy manner and the number of parts is reduced. SOLUTION: The seat back frame 30 is constituted of a pipe frame 30 arranged along the outer shape of the seat back 12, and a tower frame 50 soldered to the pipe frame 30 and maintaining the rigidity of one side part of the seat back 12. The tower frame 50 is formed of a side bracket 51 on outer side, a side bracket 52 on inner side and an insert brace 53. The arm 14b side of a recliner 14 is fastened with bolts 14b to the outer side of the tower frame 50 lower part. Bolt holes 57 for the bolts 14b are formed at the lower part of the tower frame 50. Collars 59 are inserted into the bolt holes 57.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat back frame for a vehicle seat having a three-point seat belt, and more specifically, a retractor for retracting a seat belt is stored below a seat back. A belt through which is pulled out from this retractor and guides a shoulder belt that restrains the occupant's shoulder is attached to the upper end of the seat back. The present invention relates to a seat back frame for a vehicle seat provided with a three-point seat belt supported by fixing portions provided on both sides of the vehicle.

[0002]

2. Description of the Related Art In general, a seat belt is roughly classified into a type in which a retractor is fixed to a pillar on a vehicle body side and a type in which a retractor is directly fixed to a seat back frame. By the way, a normal seat belt is composed of a lap belt portion for restraining the occupant's waist and a shoulder belt portion for restraining the occupant from the shoulder portion to the torso portion. It has a three-point anchor configuration.

[0003] In a vehicle seat having a shoulder anchor point provided on the side of a seat back frame, an impact load acting on the shoulder anchor point from a shoulder belt is very large at the time of an accident. Therefore, it is necessary to reinforce the seat back frame. FIG. 6 shows an example in which the seat back frame has a reinforcing structure, and the seat back frame 1 has a pipe frame 2 along the outer shape of the seat back.
And a tower frame 3 to which a belt through (not shown) of a shoulder anchor portion is attached. In particular, as a reinforcing structure of the tower frame 3, a cross member 4 is provided.
From the upper end of the tower frame 3 to the bracket 2a on the opposite side in an inclined manner.

When a recliner is attached to the lower portion of the tower frame 3, a welt nut is used, and a reinforcing component made of a resin material or the like is inserted from the lower portion of the tower frame 3 to prevent buckling deformation.

[0005]

As described above, the seat back frame 1 of the conventional vehicle seat having the seat belt has the reinforcing cross member 4 disposed from the upper end of the tower frame 3 to the opposite side. Since the weight of the cross member 4 is increased, operability during reclining operation of the seat back is reduced. Furthermore, since the cross member 4 is disposed so as to cross the diagonal direction substantially at the center of the seat back, for example, an active headrest (when the lower end side of the headrest stay is pressed rearward when an impact is applied) The headrest can be moved forward to prevent the occupant's head from swinging backward and protect the occupant's head). It has been pointed out that the active type headrest which has high functionality cannot be applied because it cannot be adopted.

Further, when a recliner is attached to the lower part of the tower frame 3 using a welt nut, reinforcing parts such as a resin material for preventing buckling deformation are required, so that the number of parts increases and cost increases. Had disadvantages.
Further, when the retractor is directly fixed to the seat back frame 1, there is a possibility that the retractor may come into contact with a seated person at the time of a collision or the like.

An object of the present invention is to provide a seat back frame for a vehicle seat equipped with a three-point support type seat belt, in which a center of gravity is lowered to maintain strong rigidity sufficient to withstand an impact load applied to a tower frame. And can reduce the weight compared to the conventional cross member, prevent the retractor from coming into contact with the occupant in the event of a collision, and can easily and quickly mount the recliner. An object of the present invention is to provide a seat back frame for a vehicle seat which is capable of distributing the load of the outer side bracket to the inner side bracket, reducing the number of parts, and having excellent economy.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a seat back frame for a vehicle seat according to a first aspect of the present invention has a seat belt winding portion provided below a seat back. A retractable retractor is retracted from the retractor, and a belt through that guides a shoulder belt that restrains the occupant's shoulder is attached to the upper end of the seat back, and restrains the tip of the shoulder belt and the occupant's waist. In a seat back frame for a vehicle seat equipped with a three-point seat belt that supports both ends of a lap belt with fixed portions provided on both sides of a seat cushion, the seat back frame includes a pipe frame along an outer shape of the seat back. And a vertically extending tower frame provided on the side part on the side where the belt through is attached. , Arm side recliner outside of the bottom of the tower frame is bolted, together with the bolt hole of the bolt is formed in the lower portion of the tower frame, characterized in that color into the bolt hole is inserted.

According to a second aspect of the present invention, there is provided a seat back frame for a vehicle seat, wherein a through hole is formed in a lower portion of a tower frame of the seat back frame, and an end of a lower pipe is inserted into the through hole. The end of the lower pipe is welded to the outer peripheral edge of the through hole.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat back frame in a vehicle seat according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a vehicle seat employing a seat back frame according to the present invention, FIG. 2 is a perspective view showing a configuration of a seat back frame according to the present invention, and FIG. 3 is a configuration of a tower frame in the seat back frame. FIG. 4 is a horizontal sectional view of a recliner mounting portion of the tower frame, and FIG. 5 is a horizontal sectional view of a mounting portion at an end of the lower pipe.

In FIG. 1, a vehicle seat 10 is provided with a three-point seat belt, and a seat back 12 is fixed to a seat cushion 11 on which an occupant sits via a recliner (not shown in FIG. 1). The seat back 12 is mounted so that the angle reclining can be adjusted.
A headrest 13 for supporting the head of the occupant is provided on the upper edge of the vehicle.

In the seat belt device mounted on the vehicle seat 10, a shoulder belt 21 is pulled out from a retractor 20 stored in the seat back 12, and the shoulder belt 21 is attached to an upper end of the seat back 12. The occupant is pulled out obliquely downward so that the shoulder of the occupant can be restrained through the attached belt through 22.

Further, a lap belt 23 for restraining the occupant's waist is pulled out from the retractor 20, and the tongue 2 is attached to the shoulder belt 21 and the tip of the lap belt 23.
The shoulder belt 21 and the lap belt 23 constituting the webbing of the seat belt are fixed to the belt through 22 at the upper end of the seat back 12 and two points on both sides of the seat cushion 11 by fastening and fixing the seat belt 11 to the buckle 25 on the side of the seat cushion 11. It has a three-point support structure.

Next, FIG. 2 shows a configuration of a seat back frame 30 of the seat back 12. The seat back frame 30 is formed by bending a pipe material, and includes a pipe frame 40 along the outer shape of the seat back 12. A tower frame 50 that extends along the up-down direction on one side of the seat back 12 and has increased rigidity is roughly configured.

More specifically, the pipe frame 40
Are formed along the upper edge, one side edge, and the lower edge along three sides of the outer shape of the seat back 12, and the upper pipe 41,
A side bracket 44 is fixed to the lower end side of the side pipe 42 by welding or the like, and a portion between the side pipe 42 and the tower frame 50 is provided below the upper pipe 41. The center pipe 45 extending in the lateral direction is reinforced.

Further, below the center pipe 45, a zigzag spring 46 is attached to the side pipe 42 and the tower frame 50.
Is suspended between. A bearing pipe 47 for bearing a stay (not shown) of the headrest 13 is also fixed to the upper pipe 41 of the pipe frame 40 by welding or the like.

The lower pipe 4 in the pipe frame 40
3 and a plurality of brackets 26 and 27 provided so as to sandwich the retractor 20 from the front-rear direction.
Is fixed. The brackets 26 and 27 are fixed to the lower pipe 43 by welding.

As shown in FIG. 2, these brackets 26,
27, the retractor 20 is held between the bracket 27 and the screw 28 from the rear bracket 27 side.
0 is attached. The recliner 14 is attached to the lower outer surface of the tower frame 50 by bolts 14a.

The seat back frame 30 according to the present invention
Is lightweight and has excellent rigidity, and has sufficient strength to withstand the impact load, particularly when an impact load is applied to the seat back 12 in an accident or the like, and furthermore, the headrest 13 has an impact absorbing function. The movable space of the provided active type headrest 13 can be sufficiently secured.

That is, as shown in FIG. 3, the tower frame 50 is inserted into the outer side brackets 51 and the inner side brackets 52 made of a long metal plate extending in the vertical direction, and both the brackets 51, 52. And an insert brace 53 which is long and has a reinforcing rib function. Reference numeral 54 denotes a cap / bracket that is fitted into the upper end opening of the tower frame 50.

Then, the outer side bracket 51
The inner side bracket 52 has a substantially U-shaped cross section, and has flanges 511 and 521 extending along the front edges of the two side brackets 51 and 52. The outer side bracket 51 and the inner side bracket 52 is a lap pad 5 on the rear edge along the vertical direction.
5 are spot-welded at appropriate intervals of the lap pad 55.

Further, flanges 511 and 521 along the front edges of both side brackets 51 and 52 are abutted, and spot welding is performed between the two flanges 511 and 521 at appropriate intervals along the vertical direction.
The insert brace 53 is accommodated in the internal space between the insert brace 53 and the vertical wall 53 of the insert brace 53.
The flanges 533 and 534 of both sides of the insert brace 53 are welded to the inner surface of the outer side bracket 51 so that the first and second 532 have a rib function, and the top surface 535 of the insert brace 53 is formed on the inner surface of the inner side bracket 52. Welded.

Accordingly, as described above, the seat back frame 30 is constructed such that the tower frame 50 is
3 and a center pipe 45
Are arranged in the lateral direction, so that the vertical wall portions 531, 532 and the center pipe of the tower frame 50, particularly the insert brace 53, against the impact load and the stress applied to the seat back frame 12 in the vehicle width direction. Since 45 functions effectively, the tower frame 50 does not buckle and can maintain strong rigidity.

Further, as shown in FIG.
0, the arm 14b side of the recliner 14 is fixed to a bolt 14a, and a bolt hole 5 of the bolt 14a is fixed.
7 is formed at the lower part of the tower frame 50. A collar 59 is inserted through the bolt hole 57. The collar 59 has a thread formed therein, and the bolt 1
The arm 14b is fixed to the outside of the lower part of the tower frame 50 by 4a.

Also, as shown in FIG.
A through hole 61 is formed in the lower part of the hole 0, and the end of the lower pipe 43 is inserted into the through hole 61. The end of the lower pipe 43 is fixed to the outer peripheral edge of the through hole 61 by welding or the like.
Reference numeral 63 denotes a welded portion.

In this embodiment, the tip of the flange 511 of the outer side bracket 51 is bent inward or curled, which may damage the pad of the seat back 12 or the skin. It is considered not to be. Also, the outer side bracket 51 and the inner side bracket 5
2 and the two flanges 511 and 521 are spot-welded to each other.
By adjusting the joining white of the first and second brackets 521, it is possible to effectively absorb the variation in alignment between the two side brackets 51 and 52.

[0027]

As described above, the seat back frame of the vehicle seat according to the first aspect of the present invention has the following features.
It is composed of a pipe frame along the outer shape of the seat back, and a vertically extending tower frame provided on a side portion on the side of the belt through attachment side. The arm side of the recliner is bolted to the outside of the lower part of the tower frame, and the bolt of the bolt Since a hole is formed at the bottom of the tower frame and a collar is inserted into the bolt hole,
Even if an impact load is applied in the width direction and the front-rear direction of the vehicle during an accident or the like, the tower frame does not buckle, the rigidity of the seat back can be strengthened, and the retractor contacts the occupant in the event of a collision. Thus, the recliner can be easily and quickly mounted, the load on the outer side bracket can be dispersed to the inner side bracket, and the number of parts can be reduced, thereby improving the economic efficiency.

Next, according to the seat back frame of the vehicle seat according to the second aspect of the present invention, a through hole is formed in a lower portion of the tower frame of the seat back frame, and the end of the lower pipe is formed in the through hole. Part, and the end of the lower pipe is welded at the outer peripheral edge of the through hole, so that the load on the outer side bracket can be dispersed to the inner side bracket, thereby reducing the number of parts and improving economy. be able to.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a vehicle seat employing a seat back frame in a vehicle seat according to the present invention.

FIG. 2 is a perspective view showing a configuration of a seat back frame in the vehicle seat according to the present invention.

FIG. 3 is an exploded perspective view of a tower frame in the seat back frame shown in FIG. 2;

FIG. 4 is a horizontal sectional view of a recliner mounting portion of the tower frame of the seat back frame in the vehicle seat according to the present invention.

FIG. 5 is a horizontal sectional view of a mounting portion at an end of a lower pipe of a seat back frame in a vehicle seat according to the present invention.

FIG. 6 is a perspective view showing a seat back frame in a conventional integrated seat belt-attached seat.

[Explanation of symbols]

 Reference Signs List 10 vehicle seat 11 seat cushion 12 seat back 13 headrest 14 recliner 14a bolt 14b arm 20 seat belt retractor 21 seat belt (shoulder belt) 22 belt through 23 seat belt (lap belt) 24 tongue 25 buckle 26 bracket 27 Bracket 30 Seat back frame 40 Pipe frame 41 Upper pipe 42 Side pipe 43 Lower pipe 44 Side bracket 45 Center pipe 47 Bearing pipe 50 Tower frame 51 Outer side bracket 511 Flange 52 Inner side bracket 521 Flange 53 Insert brace 531 Vertical wall 532 Vertical Wall 533 Flange 534 Flange 535 Top 54 Cap Use the bracket 55 laps 57 bolt holes 59 collar 61 through hole 63 welded portion

Claims (2)

[Claims] A retractor for retracting a seat belt is stored at a lower portion of the seat back, and a belt through which is pulled out from the retractor and guides a shoulder belt for restraining an occupant's shoulder is provided at an upper end portion of the seat back. A seat back frame for a vehicle seat equipped with a three-point seat belt that is attached and supports both ends of a lap belt that restrains a tip of a shoulder belt and a waist of an occupant with fixed portions provided on both sides of a seat cushion; The seat back frame is composed of a pipe frame along the outer shape of the seat back, and a vertically extending tower frame provided on the side portion on the belt through mounting side, and the arm side of the recliner is bolted to the outside of the lower portion of the tower frame. The bolt holes of the bolts are formed at the bottom of the tower frame Together they are, the seat back frame in a vehicle seat, characterized in that color into the bolt hole is inserted. 2. The method according to claim 1, wherein a through hole is formed in a lower portion of the tower frame of the seat back frame, an end of the lower pipe is inserted into the through hole, and an end of the lower pipe is welded to an outer peripheral edge of the through hole. The seat back frame of the vehicle seat according to claim 1.