JP2002315649A - Vehicle seatback frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seatback frame using a simple mechanism, having high productivity, being excellent in strength, and avoiding distortion caused by machining to improve the insertion property of headrest support resin. SOLUTION: The seatback frame includes a headrest bracket for supporting a headrest inserted therein, an upper frame having a mounting seat formed on the surface of its headrest mounting side so that the headrest bracket is transversely secured to the headrest bracket, at least two spaced apart supporting protrusions extending along the longitudinal direction of the upper frame and formed on the mounting seat, and at least two spaced apart abutting protrusions formed on the headrest bracket to abut against and join with the supporting protrusions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat back frame for supporting a vertical headrest of a vehicle seat.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a headrest 10 for a vehicle seat has a headrest 10 in a horizontal frame portion of an upper frame 11 of a seatback frame composed of a pipe member disposed inside a seatback. A configuration in which a pipe-shaped headrest bracket 12 is fixed in a cross-shaped manner to a recessed mounting seat 11 a provided on the mounting side, and the headrest 10 is inserted into the headrest bracket 12 and mounted via a headrest support resin 13. Has become. The headrest bracket 12 was generally attached to the upper frame 11 by arc welding 20. In addition, the published utility model of Sho 61-11
No. 8449 discloses that a cylindrical pipe-shaped headrest bracket abuts in a cross-shaped manner on a support projection formed by extending horizontally in both upper and lower ends of a concave mounting seat provided in a horizontal frame portion of an upper frame. A seat back frame in which two contact portions are resistance-welded is shown.

[0003]

However, such a conventional technique has the following problems. In the method in which the headrest bracket 12 is attached to the upper frame 11 by arc welding, the insertability of the headrest support resin 13 is often remarkably deteriorated due to the effects of welding bead beads and thermal strain. In addition, the time required for arc welding is long, and productivity is poor in mass production. In addition, the above-mentioned 61-118
The configuration according to Japanese Patent No. 449 has a disadvantage that the contact portion between the headrest bracket and the upper frame has only two contact portions and is weak in strength. In order to solve these problems, an object of the present invention is to provide a vehicle seat back frame that has a simple mechanism, has high productivity, is excellent in strength, has no processing distortion, and has good insertability of a headrest support resin. To provide.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a headrest bracket for supporting a headrest by inserting a headrest and a mounting seat on a surface on a headrest mounting side are formed. An upper frame to which the headrest bracket is fixedly attached to the seat in an intersecting manner; and at least two support projections formed on the mounting seat and extending along the longitudinal direction of the upper frame and spaced from each other. At least two of the headrest brackets are formed at intervals so as to abut against the support protrusion, and are joined to the support protrusion.
And a contact abutting projection.

Further, the support projection and the contact projection are resistance-welded.

[0006] The headrest bracket is a press-formed product having a closed cross section and a hollow shape having the abutting projection.

[0007]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 2 is a perspective view of the upper frame portion of the vehicle seat back frame according to one embodiment of the present invention. A vehicle seat back frame according to an embodiment of the present invention is the same as the conventional configuration shown in FIG. 1 except for the structure of a fixing portion between a headrest bracket 2 and an upper frame 1. Therefore, the structure of the fixing portion between the headrest bracket 2 and the upper frame 1 will be described in detail below.

FIG. 3 is an exploded perspective view of an attachment portion between the upper frame 1 and the headrest bracket 2 according to one embodiment of the present invention. FIG. 4 is a partial view taken along the line AA of FIG. FIG. 3 is a partial cross-sectional view taken along the line BB in FIG. 2. The upper frame 1 is formed of a thin pipe-shaped member which is bent and disposed inside a seat back (not shown). As shown in FIGS. 2 to 5, the upper horizontal frame portion has a headrest mounting surface. There are provided two concave mounting seats 1a for fixing the brackets 2 in a cross shape. Further, as shown in FIGS. 3 to 5, two upper and lower support projections 1b are formed at the upper and lower ends of the mounting seat 1a so as to extend horizontally.

The headrest bracket 2, as shown in FIGS. 3 and 4, is formed of a hollow member having a thin closed cross-sectional shape such as a substantially square cross-sectional shape so that a headrest support resin can be inserted. Then 2
This is a press-formed product formed by projecting the contact projection 2a of the strip.

As shown in FIG. 2 to FIG. 5, the supporting projections 1 formed on two mounting seats 1a of the upper frame 1 are provided.
b, the contact protrusion 2a of the headrest bracket 2
It is desirable that four contact portions where the support projection 1b and the contact projection 2a intersect with each other are simultaneously resistance-welded to one headrest bracket 2 in a state where they are contacted in a crossing manner.

[0011]

As described above, the vehicle seat back frame according to the present invention, which has been described in detail, has four contact portions (the support protrusion 1b and the contact protrusion 2a) with respect to one headrest bracket and the upper frame. (Crossover) is resistance welded at the same time, so that it is possible to weld in a short time and excellent in strength, and there is no penetration bead of welding, and there is little distortion due to heat, so headrest support The resin insertability is also good and high quality. In addition, since the headrest bracket is a press-formed product having a simple structure (closed-section hollow shape having the abutting projection 2a), there is a high degree of freedom in the shape and it is less expensive than a pipe material. It offers unprecedented effects such as productivity.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a headrest mounting portion of a conventional vehicle seat back frame.

FIG. 2 is a perspective view of an upper upper frame portion of the vehicle seat back frame according to one embodiment of the present invention.

FIG. 3 is an exploded perspective view of a mounting portion between an upper frame and a headrest bracket according to one embodiment of the present invention.

FIG. 4 is a partial view taken on line AA of FIG. 2;

FIG. 5 is a partial sectional view taken along the line BB of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Upper frame 1a, 11a Mounting seat 1b Support convex part 2, 12 Headrest bracket 2a Contact convex part 10 Headrest 13 Headrest support resin

Claims (3)

[Claims] A headrest bracket for supporting the headrest by inserting the headrest, an upper frame having a mounting seat formed on a surface on a headrest mounting side, and the headrest bracket being fixed to the mounting seat in an intersecting manner; At least two of the mounting seats extend along the longitudinal direction of the upper frame and are spaced from each other.
The headrest bracket has at least two contact protrusions formed at intervals on the headrest bracket so as to abut on the support protrusions and joined to the support protrusions. Characteristic vehicle seat back frame. 2. The vehicle seat back frame according to claim 1, wherein the support projection and the contact projection are resistance-welded. 3. The vehicle seat back frame according to claim 1, wherein the headrest bracket is a press-formed product having a closed cross-section and a hollow shape having the contact projection.