JPH06205716A - Seat back frame - Google Patents

Abstract

PURPOSE:To secure the strength against a front load and miniaturize a seat back frame main body by providing two or more webs in the seat back frame constituted of horizontal members and vertical members into a nearly reversed U-shape and made of webs and a flange on the cross section. CONSTITUTION:A seat back frame 1 is molded by the gradually changed roll molding method, vertical members 2 and horizontal members 3 are continuously and integrally molded into a nearly reversed U-shape, and the web width 10a of the seat back frame 1 is made larger toward the lower section because the moment by a front load F is increased. The vertical member 2 is provided with through holes 4, 5 to be inserted with bolts when a reclining mechanism and a vertical member reinforcing pipe are fitted. The seat back frame 1 is constituted of webs 10, a flange 11, and bend sections 12 preventing both ends from being faced to outsides, and they are integrally molded. Two webs 10 are provided, and the strength against the front load F can be secured and the enlargement is prevented when the number of the webs 10 is increased.

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 used in a vehicle seat.

[0002]

2. Description of the Related Art As a conventional seat back frame,
First, there is a technique disclosed in Japanese Patent Laid-Open No. 10740/1990. This is to form a seat back frame by separately forming a horizontal member and a vertical member and connecting them by, for example, spot welding. Further, FIG. 5 shows a sectional view of the seat back frame disclosed in this publication. In the figure,
Reference numeral 10 is a web, 11 is a flange, and flanges 11 are provided at both ends of the web 10, and one web 10 is provided.

On the other hand, as a second conventional technique, an actual fair 2-
In the technique disclosed in Japanese Patent No. 40836, since the seat back frame is formed into a substantially inverted U shape by bending a metal pipe, the seat back frame has the same strength at any part. Further, a holder is attached to the cross member of the seat back frame, and the headrest is fixed to this holder.

[0004]

In the first prior art described above, since the load F (FIG. 5) from the front is received by the web, the web width must be increased as the applied moment load increases. Therefore, the main body of the seat back frame becomes large, and it may not be possible to use the seat back frame in a place where the space is small.

Further, in general, a seat back frame is formed by a press forming method, a horizontal member and a vertical member are separately formed, and both are joined by, for example, spot welding. In this case, the number of manufacturing steps was large, and the strength was secured by welding, especially against the load from the lateral direction, but there is a risk of insufficient strength due to welding defects, etc., so it is necessary to perform strength management. Yes, the cost was high.

Further, securing excessive strength at a position where the applied load is small leads to a high cost, and further, the moment load from the front load F is larger toward the lower part of the vertical member, so that the second prior art described above is used. If the entire seat back frame is molded to the same strength, the cost is high.

On the other hand, when the headrest is attached to the seat back frame, if there is one web as shown in the first prior art, there is one support portion of the headrest,
It is not fixed by this. Therefore, in the second conventional technique, the headrest is fixed to the seatback frame by the holder, but in this case, the number of manufacturing steps such as manufacturing the holder and attaching the holder to the seatback frame is large, resulting in high cost.

An object of the present invention is to provide a seat back frame capable of ensuring a strength corresponding to a front load without causing an increase in size of the seat back frame body.

A second object of the present invention is to provide a low cost seat back frame which requires a small number of manufacturing steps.

A third object of the present invention is to provide a low cost seat back frame which does not secure excessive strength.

A fourth object of the present invention is to provide a seat back frame capable of ensuring strength against a lateral load at low cost.

A fifth object of the present invention is to provide a low cost seat back frame capable of fixing a headrest without requiring a holder.

[0013]

[Constitution of the invention]

[0014]

In order to solve the above technical problems, the technical means taken in the invention of claim 1 comprises a horizontal member and a vertical member integrally provided at both ends of the horizontal member. A seat back frame having a substantially inverted U shape and a cross section having a web and a flange has two or more webs.

The technical means taken in the invention of claim 2 is that the horizontal member and the vertical member are integrally molded.

The technical means taken in the invention of claim 3 is that the width of the web is formed so as to become wider as it goes downward.

The technical means taken in the invention of claim 4 is that the width of the flange of the connecting portion between the vertical member and the horizontal member is arbitrarily larger than that of the other portions.

The technical means taken in the invention of claim 5 is that the width of the flange of the cross member is arbitrarily widened in the headrest mounting portion.

[0019]

The operation of the invention of claim 1 will be described. Web is 2
By having one or more, two or more webs receive a frontal load, so the web width may be obtained by dividing the number by the number of webs, and after securing the strength against a frontal load,
The seat back frame body is prevented from becoming large.

The operation of the invention of claim 2 will be described. Since the horizontal member and the vertical member are integrally molded, there is no need to join them by welding or the like at the joining portion, so the number of manufacturing steps is small and the cost is low.

The operation of the invention of claim 3 will be described. Since the vertical member has a larger moment load from the front load F toward the lower side, the width of the web of the vertical member is wider toward the lower side, so that the strength against the front load is increased toward the lower side and excessive strength is not achieved. And low cost.

The operation of the invention of claim 4 will be described. By forming the width of the flange at the joint between the vertical member and the horizontal member to be arbitrarily larger than other parts, it is possible to secure strength without welding etc. and it is not necessary to perform strength management at low cost. is there.

The operation of the invention of claim 5 will be described. When a headrest is attached to a seat back frame, a plurality of webs are provided so that the headrest has a plurality of supporting portions.Furthermore, the flange width of the cross member is arbitrarily wide at the headrest attaching portion, so that a plurality of supporting portions are supported. The space between the parts is wide, and the headrest can be attached without a holder.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the drawings.

The same reference numerals are used for the portions corresponding to those of the conventional technique.

FIG. 1 shows the outer appearance of a seat back frame according to the present invention. In the figure, the seat back frame 1 is formed by a gradual roll forming method, and as shown in the figure, the vertical member 2 and the horizontal member 3 are continuously integrally formed to have a substantially inverted U-shape, and further, the seat back frame is formed. The frame 1 has a larger web width 10a because the moment due to the front load F increases as it goes downward.
Further, the vertical member 2 is provided with through holes 4 and 5 through which bolts are inserted when a reclining mechanism (not shown) and a reinforcing pipe (not shown) for reinforcing the vertical member 2 are attached.
Further, a mounting hole 6 for mounting a headrest (not shown) that supports the user's head is provided.

FIG. 2 shows an arrow view of the AA cross section of FIG.
In the figure, 10 is a web, 11 is a flange and 1
Reference numeral 2 is a bent portion that prevents both ends from facing outward, and each is integrally molded. Also, as shown in the figure,
Two webs 10 are provided.

FIG. 3 shows an arrow view of the BB cross section of FIG.
In the figure, 10 is a web, 11 is a flange and 1
Reference numeral 2 denotes a bent portion, each of which is integrally formed as in FIG. 2, and two webs 10 are provided.

FIG. 4 shows another embodiment of the sectional shape of the seat back frame 1. In the figure, the cross section is formed into a substantially S-shape, and has three webs 10.

As shown in FIGS. 2 to 4, by increasing the number of the webs 10, it is possible to secure the strength against the front load F while keeping the width of the webs 10 small.
The seat back frame is prevented from increasing in size for securing strength.

Further, when the headrest is fitted, if the web 10 is formed by one as in the prior art,
Since the headrest is not fixed because it is supported at one point, it must be fixed by providing a holder or the like. However, when two or more webs 10 are molded, the supporting portion has two points and it is not necessary to provide a holder.

[0032]

The effect of the invention of claim 1 will be described. A seat back frame, which is composed of a cross member and a vertical member integrally provided at both ends of the cross member, has a substantially inverted U shape, and has a cross section including a web and a flange, and has two or more webs. In the seat back frame, the front load is received by two or more webs. Therefore, the width of the web may be divided by the number of webs, and the strength of the seat back frame body should be secured after securing the strength against the front load. In addition to preventing the increase in size, the web width can be further reduced, and the seat back frame body can be expected to be downsized.

The effect of the invention of claim 2 will be described. It is a seat back frame characterized in that a horizontal member and a vertical member are integrally molded, and since the horizontal member and the vertical member are integrally molded, it is not necessary to connect them, so the number of manufacturing steps is small,
It can be manufactured at low cost. Further, it is possible to provide a new seat back frame in which a cross member and a cross member are integrally formed with a cross section having a plurality of webs.

The effect of claim 3 will be described. The seat back frame is characterized in that the width of the web is formed wider toward the lower side, and the vertical member having a larger moment load applied toward the lower side has a smaller moment load applied because the web width is formed wider toward the lower side. Excessive strength is not secured in the part, and the cost is low.

The effect of the invention of claim 4 will be described. The seat back frame is characterized in that the width of the flange of the connecting portion of the vertical member and the horizontal member is formed to be arbitrarily larger than other portions, and since strength is not secured by welding,
The cost is low because there is no need to worry about welding defects and strength management.

The effect of the invention of claim 5 will be described. When a headrest is attached to a seat back frame, a plurality of webs are provided so that the headrest has a plurality of supporting portions.Furthermore, the flange width of the cross member is arbitrarily wide at the headrest attaching portion, so that a plurality of supporting portions are supported. Since the interval between the parts is wide and the headrest is fixed, it is not necessary to provide a fixing member such as a holder, the number of parts can be reduced, and the cost is low.

[Brief description of drawings]

FIG. 1 is an external view of a seat back frame according to an embodiment of the present invention.

FIG. 2 shows an arrow view of the AA cross section of FIG.

FIG. 3 shows an arrow view of the BB cross section of FIG.

FIG. 4 shows another embodiment of the cross section of the seat back frame according to the present invention.

FIG. 5 shows a sectional view of a conventional seat back frame.

[Explanation of symbols]

 1 ... Seat back frame 10 ... Web 10a ... Web width 11 ... Flange

Claims (5)

[Claims] 1. A seat back frame comprising a horizontal member and a vertical member integrally provided at both ends of the horizontal member and having a substantially inverted U shape and having a cross section including a web and a flange, wherein the web is 2 A seat back frame having one or more. 2. The seat frame according to claim 1, wherein the horizontal member and the vertical member are continuously and integrally formed. 3. The seat back frame according to claim 1, wherein the width of the web is formed so as to be lower as it goes downward. 4. The flange according to claim 1, wherein the width of the flange of the joint between the vertical member and the horizontal member is arbitrarily larger than that of the other portion. Seat back frame. 5. The seat back frame according to claim 1, wherein the width of the flange of the cross member is arbitrarily widened in the headrest mounting portion.